MiCOM

P125/P126/P127
Directional/Non-directional Relay

P12y/EN M/E95

Version P125/P126 V12

P127 V13

Technical Manual
Technical Manual P12y/EN M/E95

MiCOM P125/P126 & P127 Page 1/2

MiCOM P125/P126 & P127

Directional/Non-directional Relay
CONTENT

Safety Section Pxxxx/EN SS/G11

Introduction P12y/EN IT/E95

Handling, Installation and Case Dimensions P12y/EN IN/E95

User Guide P12y/EN FT/E95

Menu content tables P12y/EN HI/E95

Technical Data and Curve Characteristics P12y/EN TD/E95

Getting Started P12y/EN GS/E95

Application Guide P12y/EN AP/E95

Communication Database P12y/EN CT/E95

Commissioning and Maintenance Guide P12y/EN CM/E95

Connection Diagrams P12y/EN CO/E95

Commissioning Test and Record Sheet P12y/EN RS/E95

Hardware/Software version history and compatibility P12y/EN VC/E95

P12y/EN M/E95 Technical Manual

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BLANK PAGE
 Pxxx/EN SS/G11

SAFETY SECTION
 Pxxx/EN SS/G11

Safety Section Page 1/8

STANDARD SAFETY STATEMENTS AND EXTERNAL

LABEL INFORMATION FOR SCHNEIDER ELECTRIC
EQUIPMENT

1. INTRODUCTION 3

2. HEALTH AND SAFETY 3

3. SYMBOLS AND EXTERNAL LABELS ON THE EQUIPMENT 4

3.1 Symbols 4
3.2 Labels 4
4. INSTALLING, COMMISSIONING AND SERVICING 4

5. DECOMMISSIONING AND DISPOSAL 7

6. TECHNICAL SPECIFICATIONS FOR SAFETY 8

6.1 Protective fuse rating 8
6.2 Protective Class 8
6.3 Installation Category 8
6.4 Environment 8
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 Pxxx/EN SS/G11

Safety Section Page 3/8

1. INTRODUCTION
This guide and the relevant equipment documentation provide full information on safe
handling, commissioning and testing of this equipment. This Safety Guide also includes
descriptions of equipment label markings.
Documentation for equipment ordered from Schneider Electric is despatched separately from
manufactured goods and may not be received at the same time. Therefore this guide is
provided to ensure that printed information which may be present on the equipment is fully
understood by the recipient.
The technical data in this safety guide is typical only, see the technical data section of the
relevant product publication(s) for data specific to a particular equipment.

Before carrying out any work on the equipment the user should be familiar with the
contents of this Safety Guide and the ratings on the equipment’s rating label.

Reference should be made to the external connection diagram before the equipment is
installed, commissioned or serviced.
Language specific, self-adhesive User Interface labels are provided in a bag for some
equipment.

2. HEALTH AND SAFETY

The information in the Safety Section of the equipment documentation is intended to ensure
that equipment is properly installed and handled in order to maintain it in a safe condition.
It is assumed that everyone who will be associated with the equipment will be familiar with
the contents of that Safety Section, or this Safety Guide.
When electrical equipment is in operation, dangerous voltages will be present in certain parts
of the equipment. Failure to observe warning notices, incorrect use, or improper use may
endanger personnel and equipment and also cause personal injury or physical damage.
Before working in the terminal strip area, the equipment must be isolated.
Proper and safe operation of the equipment depends on appropriate shipping and handling,
proper storage, installation and commissioning, and on careful operation, maintenance and
servicing. For this reason only qualified personnel may work on or operate the equipment.
Qualified personnel are individuals who:

• Are familiar with the installation, commissioning, and operation of the equipment and
of the system to which it is being connected;

• Are able to safely perform switching operations in accordance with accepted safety
engineering practices and are authorised to energize and de-energize equipment and
to isolate, ground, and label it;

• Are trained in the care and use of safety apparatus in accordance with safety
engineering practices;

• Are trained in emergency procedures (first aid).

The equipment documentation gives instructions for its installation, commissioning, and
operation. However, the manual cannot cover all conceivable circumstances or include
detailed information on all topics. In the event of questions or specific problems, do not take
any action without proper authorization. Contact the appropriate Schneider Electric technical
sales office and request the necessary information.
Pxxx/EN SS/G11

Page 4/8 Safety Section

3. SYMBOLS AND EXTERNAL LABELS ON THE EQUIPMENT

For safety reasons the following symbols and external labels, which may be used on the
equipment or referred to in the equipment documentation, should be understood before the
equipment is installed or commissioned.
3.1 Symbols

Caution: refer to equipment documentation Caution: risk of electric shock

Protective Conductor (*Earth) terminal Functional/Protective Conductor (*Earth)

terminal.
Note: This symbol may also be used for a
Protective Conductor (Earth) Terminal if that
terminal is part of a terminal block or sub-
assembly e.g. power supply.

*NOTE: THE TERM EARTH USED THROUGHOUT THIS GUIDE IS THE

DIRECT EQUIVALENT OF THE NORTH AMERICAN TERM
GROUND.
3.2 Labels
See Safety Guide (SFTY/4L M/G11) for equipment labelling information.

4. INSTALLING, COMMISSIONING AND SERVICING

Equipment connections
Personnel undertaking installation, commissioning or servicing work for this
equipment should be aware of the correct working procedures to ensure safety.
The equipment documentation should be consulted before installing,
commissioning, or servicing the equipment.
Terminals exposed during installation, commissioning and maintenance may
present a hazardous voltage unless the equipment is electrically isolated.
The clamping screws of all terminal block connectors, for field wiring, using M4
screws shall be tightened to a nominal torque of 1.3 Nm.
Equipment intended for rack or panel mounting is for use on a flat surface of a
Type 1 enclosure, as defined by Underwriters Laboratories (UL).
Any disassembly of the equipment may expose parts at hazardous voltage, also
electronic parts may be damaged if suitable electrostatic voltage discharge (ESD)
precautions are not taken.
If there is unlocked access to the rear of the equipment, care should be taken by
all personnel to avoid electric shock or energy hazards.
Voltage and current connections shall be made using insulated crimp terminations
to ensure that terminal block insulation requirements are maintained for safety.
Watchdog (self-monitoring) contacts are provided in numerical relays to indicate
the health of the device. Schneider Electric strongly recommends that these
contacts are hardwired into the substation's automation system, for alarm
purposes.
 Pxxx/EN SS/G11

Safety Section Page 5/8

To ensure that wires are correctly terminated the correct crimp terminal and tool
for the wire size should be used.
The equipment must be connected in accordance with the appropriate connection
diagram.
Protection Class I Equipment
- Before energizing the equipment it must be earthed using the protective
conductor terminal, if provided, or the appropriate termination of the
supply plug in the case of plug connected equipment.
- The protective conductor (earth) connection must not be removed since
the protection against electric shock provided by the equipment would be
lost.
- When the protective (earth) conductor terminal (PCT) is also used to
terminate cable screens, etc., it is essential that the integrity of the
protective (earth) conductor is checked after the addition or removal of
such functional earth connections. For M4 stud PCTs the integrity of the
protective (earth) connections should be ensured by use of a locknut or
similar.
The recommended minimum protective conductor (earth) wire size is 2.5 mm²
(3.3 mm² for North America) unless otherwise stated in the technical data section
of the equipment documentation, or otherwise required by local or country wiring
regulations.
The protective conductor (earth) connection must be low-inductance and as short
as possible.
All connections to the equipment must have a defined potential. Connections that
are pre-wired, but not used, should preferably be grounded when binary inputs
and output relays are isolated. When binary inputs and output relays are
connected to common potential, the pre-wired but unused connections should be
connected to the common potential of the grouped connections.
Before energizing the equipment, the following should be checked:
- Voltage rating/polarity (rating label/equipment documentation),
- CT circuit rating (rating label) and integrity of connections,
- Protective fuse rating,
- Integrity of the protective conductor (earth) connection (where
applicable),
- Voltage and current rating of external wiring, applicable to the application.
Accidental touching of exposed terminals
If working in an area of restricted space, such as a cubicle, where there is a risk of
electric shock due to accidental touching of terminals which do not comply with
IP20 rating, then a suitable protective barrier should be provided.
Equipment use
If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Removal of the equipment front panel/cover
Removal of the equipment front panel/cover may expose hazardous live parts,
which must not be touched until the electrical power is removed.
Pxxx/EN SS/G11

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UL and CSA/CUL Listed or Recognized equipment

To maintain UL and CSA/CUL Listing/Recognized status for North America the
equipment should be installed using UL or CSA Listed or Recognized parts for
the following items: connection cables, protective fuses/fuseholders or circuit
breakers, insulation crimp terminals and replacement internal battery, as
specified in the equipment documentation.
For external protective fuses a UL or CSA Listed fuse shall be used. The Listed
type shall be a Class J time delay fuse, with a maximum current rating of 15 A
and a minimum d.c. rating of 250 Vd.c., for example type AJT15.
Where UL or CSA Listing of the equipment is not required, a high rupture
capacity (HRC) fuse type with a maximum current rating of 16 Amps and a
minimum d.c. rating of 250 Vd.c. may be used, for example Red Spot type NIT or
TIA.
Equipment operating conditions
The equipment should be operated within the specified electrical and
environmental limits.
Current transformer circuits
Do not open the secondary circuit of a live CT since the high voltage produced
may be lethal to personnel and could damage insulation. Generally, for safety,
the secondary of the line CT must be shorted before opening any connections to
it.
For most equipment with ring-terminal connections, the threaded terminal block
for current transformer termination has automatic CT shorting on removal of the
module. Therefore external shorting of the CTs may not be required, the
equipment documentation should be checked to see if this applies.
For equipment with pin-terminal connections, the threaded terminal block for
current transformer termination does NOT have automatic CT shorting on removal
of the module.
External resistors, including voltage dependent resistors (VDRs)
Where external resistors, including voltage dependent resistors (VDRs), are fitted
to the equipment, these may present a risk of electric shock or burns, if touched.
Battery replacement
Where internal batteries are fitted they should be replaced with the recommended
type and be installed with the correct polarity to avoid possible damage to the
equipment, buildings and persons.
Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At the
end of each part of the test, the voltage should be gradually reduced to zero, to
discharge capacitors, before the test leads are disconnected.
Insertion of modules and pcb cards
Modules and PCB cards must not be inserted into or withdrawn from the
equipment whilst it is energized, since this may result in damage.
Insertion and withdrawal of extender cards
Extender cards are available for some equipment. If an extender card is used,
this should not be inserted or withdrawn from the equipment whilst it is energized.
This is to avoid possible shock or damage hazards. Hazardous live voltages may
be accessible on the extender card.
 Pxxx/EN SS/G11

Safety Section Page 7/8

External test blocks and test plugs

Great care should be taken when using external test blocks and test plugs such
as the MMLG, MMLB and MiCOM P990 types, hazardous voltages may be
accessible when using these. *CT shorting links must be in place before the
insertion or removal of MMLB test plugs, to avoid potentially lethal voltages.
*Note: When a MiCOM P992 Test Plug is inserted into the MiCOM P991 Test
Block, the secondaries of the line CTs are automatically shorted, making
them safe.
Fiber optic communication
Where fiber optic communication devices are fitted, these should not be viewed
directly. Optical power meters should be used to determine the operation or
signal level of the device.
Cleaning
The equipment may be cleaned using a lint free cloth dampened with clean water,
when no connections are energized. Contact fingers of test plugs are normally
protected by petroleum jelly, which should not be removed.

5. DECOMMISSIONING AND DISPOSAL

De-commissioning
The supply input (auxiliary) for the equipment may include capacitors across the
supply or to earth. To avoid electric shock or energy hazards, after completely
isolating the supplies to the equipment (both poles of any dc supply), the
capacitors should be safely discharged via the external terminals prior to
de-commissioning.
Disposal
It is recommended that incineration and disposal to water courses is avoided.
The equipment should be disposed of in a safe manner. Any equipment
containing batteries should have them removed before disposal, taking
precautions to avoid short circuits. Particular regulations within the country of
operation, may apply to the disposal of the equipment.
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6. TECHNICAL SPECIFICATIONS FOR SAFETY

Unless otherwise stated in the equipment technical manual, the following data is applicable.
6.1 Protective fuse rating
The recommended maximum rating of the external protective fuse for equipments is 16A,
high rupture capacity (HRC) Red Spot type NIT, or TIA, or equivalent. Unless otherwise
stated in equipment technical manual, the following data is applicable. The protective fuse
should be located as close to the unit as possible.
CAUTION - CTs must NOT be fused since open circuiting them may
produce lethal hazardous voltages.

6.2 Protective Class

IEC 60255-27: 2005 Class I (unless otherwise specified in the equipment

documentation). This equipment requires a protective
EN 60255-27: 2006
conductor (earth) connection to ensure user safety.

6.3 Installation Category

IEC 60255-27: 2005 Installation Category III (Overvoltage Category III):

EN 60255-27: 2006 Distribution level, fixed installation.
Equipment in this category is qualification tested at
5 kV peak, 1.2/50 µs, 500 Ω, 0.5 J, between all
supply circuits and earth and also between
independent circuits.

6.4 Environment
The equipment is intended for indoor installation and use only. If it is required for use in an
outdoor environment then it must be mounted in a specific cabinet or housing which will
enable it to meet the requirements of IEC 60529 with the classification of degree of
protection IP54 (dust and splashing water protected).
Pollution Degree - Pollution Degree 2 Compliance is demonstrated by reference
Altitude - Operation up to 2000m to safety standards.
IEC 60255-27:2005
EN 60255-27: 2006
Introduction P12y/EN IT/E95

MiCOM P125/P126/P127

INTRODUCTION
Introduction P12y/EN IT/E95

MiCOM P125/P126/P127 Page 1/8

CONTENTS

1. INTRODUCTION 3

2. HOW TO USE THIS MANUAL 4

3. INTRODUCTION TO THE MiCOM RANGE 5

4. INTRODUCTION TO THE MiCOM P125, P126 & P127 RELAYS 6

5. MAIN FUNCTIONS 7
5.1 Main functions 7
5.2 General functions 8
P12y/EN IT/E95 Introduction

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Introduction P12y/EN IT/E95

MiCOM P125/P126/P127 Page 3/8

1. INTRODUCTION
The MiCOM P125, P126 & P127 relays have been designed for controlling, protecting and
monitoring industrial installations, public distribution networks and substations. They can also
be used as part of a protection scheme for transformers and generator transformers. The
P125, P126 & P127 relays can also provide back-up protection for HV and EHV transmission
systems.
P12y/EN IT/E95 Introduction

Page 4/8 MiCOM P125/P126/P127

2. HOW TO USE THIS MANUAL

This manual provides a description of MiCOM P125, P126 and P127 functions and settings.
The goal of this manual is to allow the user to become familiar with the application,
installation, setting and commissioning of these relays.
This manual has the following format:
P12y/EN IT Introduction
The introduction presents the documentation structure and a
brief presentation of the relay, including functions.
P12y/EN IN Handling, installation and case dimensions
This section provides logistics general instructions for handling,
installing and stocking..
P12y/EN FT User Guide
This section provides relay settings with a brief explanation of
each setting and detailed description. It also provides recording
and measurements functions including the configuration of the
event and disturbance recorder and measurement functions.
P12y/EN HI Menu content tables
This section shows the menu structure of the relays, with a
complete list of all of the menu settings.
P12y/EN AP Application Notes
This section includes a description of common power system
applications of the relay, calculation of suitable settings, some
typical worked examples, and how to apply the settings to the
relay.
P12y/EN TD Technical data and curve characteristics
This section provides technical data including setting ranges,
accuracy limits, recommended operating conditions, ratings and
performance data. Compliance with norms and international
standards is quoted where appropriate.
P12y/EN CT Communication mapping data bases
This section provides an overview regarding the communication
interfaces of the relay. Detailed protocol mappings, semantics,
profiles and interoperability tables are not provided within this
manual. Separate documents are available per protocol,
available for download from our website.
P12y/EN CM Commissioning and Maintenance Guide
Instructions on how to commission the relay, comprising checks
on the calibration and functionality of the relay.
P12y/EN CO Connection diagrams
This section provides the mechanical and electrical description.
External wiring connections to the relay are indicated.
P12y/EN RS Commissioning test records
This section contains checks on the calibration and functionality
of the relay.
P12y/EN VC Hardware/Software version history
History of all hardware and software releases for the product.
Introduction P12y/EN IT/E95

MiCOM P125/P126/P127 Page 5/8

3. INTRODUCTION TO THE MiCOM RANGE

MiCOM is a comprehensive solution capable of meeting all electricity supply requirements. It
comprises of a range of components, systems and services from Schneider Electric.
Flexibility is central to the MiCOM concept.
MiCOM provides the ability to define an application solution and, through extensive
communication capabilities, to integrate this solution with your power supply control system.
The components within MiCOM are:

• P range protection relays

• C range control products

• M range measurement products for accurate metering and monitoring

• S range versatile PC support and substation control packages

MiCOM products include extensive facilities for recording information on the state and
behaviour of a power system, using disturbance and fault records.
They can also provide measurements of the power system at regular intervals to a control
centre enabling remote monitoring and control to take place.
For up-to-date information on any MiCOM product, refer to the technical publications, which
can be obtained from: Schneider Electric or your local sales office; alternatively visit our web
site.
P12y/EN IT/E95 Introduction

Page 6/8 MiCOM P125/P126/P127

4. INTRODUCTION TO THE MiCOM P125, P126 & P127 RELAYS

The MiCOM P125, P126 & P127 relays are based on the successful K, MODN and MX3
range.
Each relay includes a large number of protection and control functions for most demanding
applications.
On the front panel the relays are equipped with a liquid crystal display (LCD) with 2 x 16
backlit alphanumeric characters, a tactile 7-button keypad (to gain access to all parameters,
alarms and measurements) and 8 LEDs to display the status of the MiCOM P125, P126 &
P127.
A dedicated Schneider Electric setting software package is available that allows the user to
read, initialise and change the relay parameter settings via the RS485 rear communications
port(s) and/or the RS232 front port.
The MiCOM P125, P126 & P127 relays provide comprehensive directional overcurrent
protection for utilities networks, industrial plants and networks in addition to other
applications where directional or non-directional overcurrent protection is required.
The directional earth fault element is sensitive enough to be used in impedance-earthed
systems (such as resistance or Peterson Coil) or insulated systems.
The models available are:
MiCOM P125: Directional earth fault relay with earth fault wattmetric element.
MiCOM P126: Three phase overcurrent and directional earth fault relay with earth
fault wattmetric element and autoreclose function.
MiCOM P127: Directional overcurrent and directional earth fault relay with overpower
element, overvoltage/undervoltage, under/overfrrequency protection
and autoreclose function.
Introduction P12y/EN IT/E95

MiCOM P125/P126/P127 Page 7/8

5. MAIN FUNCTIONS
5.1 Main functions
The following table shows the functions available with the models.

ANSI
CODES FEATURES P125 P126 P127
50/51P/N 1 phase or earth overcurrent •
50/51 3 phase overcurrent • •
50/51N Earth overcurrent • •
64N Restricted Earth Fault • • •
67P 3 phase directional overcurrent •
67N Earth fault directional overcurrent • • •
51V Voltage controlled overcurrent •
37 3 phase undercurrent • •
46 Negative phase sequence overcurrent • •
27/59 Phase under/over voltage (AND & OR mode) •
59N Residual over voltage • • •
32 Directional power (active / reactive, under / over
•
power)
32N Wattmetric Earth Fault • • •
81U/O Under/over frequency •
81R Rate of Frequency •
49 Thermal overload • •
86 Output relay latching • • •
79 Autoreclose • •
50BF Circuit breaker failure detection • •
46BC Broken conductor detection I2/I1 • •
Blocking Logic • • •
Test of output relays (Maintenance) • • •
CB control Local/remote • • •
Circuit Breaker Maintenance and Trip Circuit
• •
Supervision
Cold load pick up • •
Selective relay scheme logic • •
Inrush blocking •
Switch on to fault (SOTF) • •
Phase rotation •
VT supervision (VTS) •
CT Supervision (CTS) •
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5.2 General functions

The following table shows the general features available.

GENERAL FEATURES P125 P126 P127

Number of digital inputs Standard configuration 4 7 7
Optional configuration 12
Total number of outputs
6 8 8
relays
Events recording 250 250 250
Fault recording 25 25 25
Disturbance recording 5 5 5
Setting group 2 2 8
Auxiliary timers Standard configuration 4 7 7
Optional configuration 12
Communication IEC60870-5-103, DNP 3.0 &
• • •
Modbus RTU (port 1)
IEC60870-5-103 or Modbus
•
(port 2 – optional)
Time synchronisation Via rear communication port
• • •
(DCS)
Via digital input (external clock) • • •
IRIG-B Synchronization
•
(optional)
Settings software MiCOM S1 using RS232 front
• • •
port
MiCOM S1 using optional
•
RS485 rear port
Logic equation AND, OR and NOT gates (8
• •
equations)
Measurements RMS currents values &
• • •
frequency
Peak and rolling currents
• •
values
Max and average currents
• •
values
Phase and/or neutral angle • • •
Max and average voltage
•
values
Power and Energy •
Apparent power and apparent
•
energy
Metering (optional) harmonics values, THD & TDD •
Class 0.5 measurements
•
values (P, Q, S, E)
Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127

HANDLING, INSTALLATION
AND CASE DIMENSIONS
Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127 Page 1/12

CONTENT

1. GENERAL CONSIDERATIONS 3
1.1 Receipt of relays 3
1.2 Electrostatic discharge (ESD) 3

2. HANDLING OF ELECTRONIC EQUIPMENT 4

3. RELAY MOUNTING 5

4. UNPACKING 6

5. STORAGE 7

6. CONNECTIONS 8
6.1 Connection of power terminals, and Signals terminals 8
6.2 Communication port RS485 9
6.3 RS232 port 9
6.4 IRIG-B connections (P127 option) 9
6.4.1 IRIG-B Modulated 9
6.4.2 IRIG-B demodulated 10
6.5 Protective Conductor (Earthing) 10

7. CASE DIMENSIONS 11
7.1 MiCOM P126 & P127 11
7.2 MiCOM P125 11
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Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127 Page 3/12

1. GENERAL CONSIDERATIONS
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND
ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.

1.1 Receipt of relays

Protective relays, although generally of robust construction, require careful treatment prior to
installation on site. Upon receipt, relays should be examined immediately to ensure no
damage has been sustained in transit. If damage has been sustained during transit a claim
should be made to the transport contractor and Schneider Electric should be promptly
notified.
Relays that are supplied unmounted and not intended for immediate installation should be
returned to their protective polythene bags.
1.2 Electrostatic discharge (ESD)
The relays use components that are sensitive to electrostatic discharges.
The electronic circuits are well protected by the metal case and the internal module should
not be withdrawn unnecessarily. When handling the module outside its case, care should be
taken to avoid contact with components and electrical connections. If removed from the case
for storage, the module should be placed in an electrically conducting antistatic bag.
There are no setting adjustments within the module and it is advised that it is not
unnecessarily disassembled. Although the printed circuit boards are plugged together, the
connectors are a manufacturing aid and not intended for frequent dismantling; in fact
considerable effort may be required to separate them. Touching the printed circuit board
should be avoided, since complementary metal oxide semiconductors (CMOS) are used,
which can be damaged by static electricity discharged from the body.
P12y/EN IN/E95 Handling, Installation and Case Dimensions

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2. HANDLING OF ELECTRONIC EQUIPMENT

A person’s normal movements can easily generate electrostatic potentials of several
thousand volts. Discharge of these voltages into semiconductor devices when handling
electronic circuits can cause serious damage, which often may not be immediately apparent
but the reliability of the circuit will have been reduced.
The electronic circuits are completely safe from electrostatic discharge when housed in the
case. Do not expose them to risk of damage by withdrawing modules unnecessarily.
Each module incorporates the highest practicable protection for its semiconductor devices.
However, if it becomes necessary to withdraw a module, the following precautions should be
taken to preserve the high reliability and long life for which the equipment has been designed
and manufactured.
1. Before removing a module, ensure that you are at the same electrostatic potential as
the equipment by touching the case.
2. Handle the module by its front-plate, frame or edges of the printed circuit board. Avoid
touching the electronic components, printed circuit track or connectors.
3. Do not pass the module to another person without first ensuring you are both at the
same electrostatic potential. Shaking hands achieves equipotential.
4. Place the module on an antistatic surface, or on a conducting surface which is at the
same potential as yourself.
5. Store or transport the module in a conductive bag.
If you are making measurements on the internal electronic circuitry of an equipment in
service, it is preferable that you are earthed to the case with a conductive wrist strap. Wrist
straps should have a resistance to ground between 500kΩ – 10MΩ.
If a wrist strap is not available you should maintain regular contact with the case to prevent a
build-up of static. Instrumentation which may be used for making measurements should be
earthed to the case whenever possible.
More information on safe working procedures for all electronic equipment can be found in
BS5783 and IEC 147-OF. It is strongly recommended that detailed investigations on
electronic circuitry or modification work should be carried out in a special handling area such
as described in the above-mentioned BS and IEC documents.
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MiCOM P125/P126 & P127 Page 5/12

3. RELAY MOUNTING
Relays are dispatched either individually or as part of a panel/rack assembly.
If an MMLG test block is to be included it should be positioned at the right-hand side of the
assembly (viewed from the front). Modules should remain protected by their metal case
during assembly into a panel or rack.
If external test blocks are connected to the relay, great care should be taken when using the
associated test plugs such as MMLB and MiCOM P992 since their use may make hazardous
voltages accessible. *CT shorting links must be in place before the insertion or removal of
MMLB test plugs, to avoid potentially lethal voltages.
NOTE: When a MiCOM P992 Test Plug is inserted into the MiCOM P991 Test
Block, the secondaries of the line CTs are automatically shorted,
making them safe.
For individually mounted relays an outline diagram is supplied in section 6 of this chapter
showing the panel cut-outs and hole centres.
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4. UNPACKING
Care must be taken when unpacking and installing the relays so that none of the parts is
damaged or the settings altered. Relays must only be handled by skilled persons. The
installation should be clean, dry and reasonably free from dust and excessive vibration. The
site should be well lit to facilitate inspection. Relays that have been removed from their cases
should not be left in situations where they are exposed to dust or damp. This particularly
applies to installations which are being carried out at the same time as construction work.
Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127 Page 7/12

5. STORAGE
If relays are not to be installed immediately upon receipt they should be stored in a place
free from dust and moisture in their original cartons. Where de-humidifier bags have been
included in the packing they should be retained. The action of the de-humidifier crystals will
be impaired if the bag has been exposed to ambient conditions and may be restored by
gently heating the bag for about an hour, prior to replacing it in the carton.
Dust which collects on a carton may, on subsequent unpacking, find its way into the relay; in
damp conditions the carton and packing may become impregnated with moisture and the de-
humifier will lose its efficiency.
Storage temperature: –25°C to +70°C.
P12y/EN IN/E95 Handling, Installation and Case Dimensions

Page 8/12 MiCOM P125/P126 & P127

6. CONNECTIONS
6.1 Connection of power terminals, and Signals terminals
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND
ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.

The individual equipment is delivered with sufficient M4 screws and washers to connect the
relay via insulated crimp ring terminals. The maximum number of crimped terminations, per
terminal block terminal, is two.
If necessary, Schneider Electric can provide 4 types of insulated crimp terminals (see below)
according to the cross sectional area of the wire and the type of terminal. Each reference
corresponds to a sachet of 100 terminals.

Push-on connector 4.8 x 0.8 (wire size 0.75 - 1.5mm²)

Schneider Electric reference: ZB9128 015

Push-on connector 4.8 x 0.8mm (wire size 1.5 - 2.5mm²)

Schneider Electric reference: ZB9128 016

P0166ENc

M4 90˚ Ring Tongue terminal (wire size 0.25 - 1.65mm²)

Schneider Electric reference, Stafford part number ZB9124 901

M4 90˚ Ring Tongue terminal (wire size 1.5 - 2.5mm²)

Schneider Electric reference, Stafford part number ZB9124 900

P0167ENc

To ensure the isolation of adjacent terminals, and to respect the security and safety
instructions, an insulated sleeve must be used.
We recommend the following cable cross-sections:

− Auxiliary sources Vaux: 1.5 mm²

− Communication Ports see paragraphs 6.2 and 6.3

− Other circuits 1.0 mm²

Because of the limitations of the ring terminals, the maximum wire cross-section which can
be used for the connector blocks (for current inputs and signals) is 6mm² by using non-
insulated ring terminals. When only pre-insulated terminals can be used, the maximum wire
cross-section is reduced to 2,63 mm² per ring terminal. If a more significant wire cross-
section is necessary, two wires can be connected in parallel, each one terminated by a
separate ring terminal.
Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127 Page 9/12

Except for the RS485 port(s) all the terminal blocks used for connections, can withstand a
maximum working voltage of 300V.
We recommend the auxiliary supply is protected by a NIT or TIA fuse type with a maximum
breaking capacity of 16A. For safety reasons, never install fuses in current transformers
circuits. Other circuits must be protected by fuses.
6.2 Communication port RS485
Connections to RS485 are made using ring terminals. It is recommended that a two core
screened cable, is used with a maximum total length of 1000 m or a 200nF total cable
capacitance.
Typical specification:

− Each core: 16/0.2 mm copper conductor, PVC insulated

− Nominal conductor area: 0.5 mm² per core

− Screen: Overall braid, PVC sheathed

− Linear capacitance between

conductor and earth: 100pF/m
6.3 RS232 port
Short term connections to the RS232 port, located behind the bottom access cover, can be
made using a screened multi-core communication cable up to 15m long, or a total
capacitance of 2500pF. The cable should be terminated at the relay end with a 9-way, metal
shelled, D-type male plug.
6.4 IRIG-B connections (P127 option)
The IRIG-B option integrates modulated and demodulated versions.
6.4.1 IRIG-B Modulated
IRIG-B modulated terminals: “+” = terminal 82, “–” = terminal 81.
NOTE: As IRIG-B signal is polarized, insure that BNC ground is connected on
pin n°81.
The IRIG-B input and BNC connector (including BNC adaptor) have a characteristic
impedance of 50Ω. It is recommended that connections between the IRIG-B equipment and
the relay are made using coaxial cable of type RG59LSF with a halogen free, fire retardant
sheath.
To connect the BNC connector to the relay, use the BNC adaptor fixed on the rear
connector:

− Remove the two retaining screws and the washers,

− Insert the two spacers in the 81 and 82 terminals,

− Position the BNC adaptor (“+” side on terminal 82) and screw the scre/washer
assembly (“+” and “GND” sides are marked on the adaptor).

Retaining screw

washer

spacer
P3953ENa
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Page 10/12 MiCOM P125/P126 & P127

6.4.2 IRIG-B demodulated

IRIG-B demodulated terminals: “+” = terminal 84, “–” = terminal 83.
The connections to IRIG-B unmodulated terminals are classical connections.
6.5 Protective Conductor (Earthing)
The equipment must be connected to the protective conductor via the M4 earth terminal of
the terminal block numbered 1 to 28, marked with the earth symbol. We recommend a wire
of minimal cross section of 2,5 mm². Because of the limitations of the ring terminals, the
maximum possible wire cross section is 6mm². If a larger section is necessary, one can use
cables connected in parallel, each one terminated with a ring terminal. Alternatively a
suitably sized metal strip may be used.
NOTE: To prevent any electrolytic risk between copper conductor or brass
conductors and the back plate of the equipment, it is necessary to
take precautions to isolate them one from the other. This can be done
in several ways, for example by inserting between the conductor and
the case a plated nickel washer or by using tinned terminations.
Handling, Installation and Case Dimensions P12y/EN IN/E95

MiCOM P125/P126 & P127 Page 11/12

7. CASE DIMENSIONS
7.1 MiCOM P126 & P127

P0077ENb

NOTE: For P127 with IRIG-B option with BNC adaptor, add 25 mm to the
length.
7.2 MiCOM P125

P0078ENb

NOTE: The chassis is normally secured in the case by four screws (Self
tapping screws 6x1,4), to ensure good seating. The fixing screws
should be fitted in normal service (do not add washers). Do not
discard these screws.
P12y/EN IN/E95 Handling, Installation and Case Dimensions

Page 12/12 MiCOM P125/P126 & P127

BLANK PAGE
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127

USER GUIDE
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 1/94

CONTENT

1. PRESENTATION OF MiCOM P125, P126 AND P127 RELAYS 5

1.1 User Interface 5
1.1.1 Relay Overview 5
1.1.2 Front Panel Description 6
1.1.3 LCD display and keypad description 7
1.1.4 LEDs 8
1.1.5 Description of the two areas under the top and bottom flaps 9
1.1.6 Description of rear Terminal Block for P125, P126 & P127 10
1.2 Menu structure 13
1.3 Password 13
1.3.1 Password Protection 13
1.3.2 Password Entry 13
1.3.3 Changing the Password 14
1.3.4 Change of Setting Invalidation 14
1.4 Displays of Alarm & Warning Messages 14
1.4.1 Electrical Network Alarms 14
1.4.2 Relay Hardware or Software Warning Messages 14
1.5 General characteristics 19
1.5.1 Analogue Inputs 19

2. MENU 21
2.1 OP PARAMETERS menu 22
2.2 ORDERS menu 23
2.3 CONFIGURATION menu 24
2.3.1 Submenu General Options 24
2.3.2 Voltage Connections 26
2.3.3 Submenu Transfo. Ratio 27
2.3.4 Submenus to Configure LEDs 5 to 8 28
2.3.5 Submenu Logic Inputs Choice: Active High/Low 32
2.3.6 Submenu Output Relays 32
2.3.7 Submenu Group Select 33
2.3.8 Submenu Alarms 34
2.3.9 Submenu Date 35
2.4 MEASUREMENTS menu 36
2.5 METERING Menu (P127) 39
2.5.1 Submenu “Frequency” 39
2.5.2 Submenu “Currents” 40
2.5.3 Submenu “Voltages” 41
2.5.4 Submenu Powers 42
2.5.5 Submenu Energies 43
2.5.6 Plus and minus signes for power and energy calculation. 44
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Page 2/94 MiCOM P125/P126 & P127

2.6 COMMUNICATION menu 45

2.6.1 HMI submenu 45
2.6.2 COMM1 and COMM2 submenus 45
2.6.3 IEC60870-5-103 protocol additional cells 46
2.7 PROTECTION menu 47
2.7.1 Submenu [67/50/51] PHASE OC (P126 and P127 only) 47
2.7.2 Submenu [67N] E/GND 50
2.7.3 Submenu [32] DIRECTIONAL POWER (P127 only) 55
2.7.4 Submenu [32N] EARTH WATTMETRIC (P126 and P127 only) 59
2.7.5 Submenu [46] NEG SEQ OC (P126 & P127 only) 62
2.7.6 Submenu [49] Therm OL (P126 & P127 only) 63
2.7.7 Submenu [37] UNDERCURRENT PROTECTION (P126 & P127) 64
2.7.8 Submenu [59] PHASE OVER-VOLTAGE Protection (P127) 65
2.7.9 Submenu [27] PHASE UNDER-VOLTAGE Protection (P127) 66
2.7.10 Submenu [59N] RESIDUAL OVER-VOLTAGE Protection 67
2.7.11 Submenu [79] AUTORECLOSE (P126 & P127 only) 67
2.7.12 Submenu [81] Frequency (P127 only) 70
2.7.13 Submenu [81R] Freq. rate of change (P127 only) 71
2.8 AUTOMAT. CTRL menu 72
2.8.1 Submenu Trip Commands 72
2.8.2 Submenu Latch Relays 73
2.8.3 Submenu Blocking Logic 74
2.8.4 Submenu Inrush Blocking Logic (P127 only) 75
2.8.5 Submenu Logic Select 76
2.8.6 Submenu Outputs Relays 76
2.8.7 Submenu Inputs 79
2.8.8 Submenu Broken Conductor (P126 & P127 only) 81
2.8.9 Submenu Cold Load PU (P126 & P127 only) 81
2.8.10 Submenu 51V (Overcurrent controlled by voltage transformer control (P127 only)) 82
2.8.11 Submenu VT Supervision (P127 only) 82
2.8.12 Submenu CT Supervision (P127) 83
2.8.13 Submenu Circuit Breaker Fail (P126 & P127 only) 84
2.8.14 Submenu Circuit Breaker Supervision (P126 & P127 only) 84
2.8.15 Submenu SOTF (Switch on to fault) (P126 & P127 only) 85
2.8.16 Submenu Logic Equations (P126 & P127 only) 86
2.8.17 Submenu Comm. Order delay (P127 only) 88
2.9 RECORDS menu 89
2.9.1 Submenu CB Monitoring (P126 & P127 only) 89
2.9.2 Submenu Disturb Record 91

3. WIRING 93
3.1 Auxiliary Power Supply 93
3.2 Current Measurement Inputs 93
3.3 Digital Inputs 93
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 3/94

3.4 Output Relays 93

3.5 Communication 93
3.5.1 RS485 Rear Communication Port 93
3.5.2 RS232 Front Communication Port 94
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Page 4/94 MiCOM P125/P126 & P127

BLANK PAGE
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 5/94

1. PRESENTATION OF MiCOM P125, P126 AND P127 RELAYS

MiCOM P125, P126 & P127 are fully numerical relays designed to perform electrical
protection and control functions.
The following sections describe content and structure of the menu.
The five keys situated in the middle of the MiCOM relay front panel are dedicated to set
parameters.
With the keys     it is possible to move in the direction indicated to the various levels
of the menus. The key  validates the settings modification.

The two keys  and c are dedicated to acknowledging/clearing and displaying/reading of

data. For example if successive alarms are to be displayed, press on key c.

The alarms are presented in reverse order of their detection (the most recent alarm first, the
oldest last). The user can either acknowledge and clear each alarm from the LCD by using
 or go to the end of the ALARM menu and carry out a general acknowledgement.

1.1 User Interface

1.1.1 Relay Overview
The next figures show the P125 and P126/P127 relays.

P125 P126/P127
As can be seen in above figures the case width dimensions differ between the P125 and the
P126/P127.
The table shows the case size for the relays.

Version Height Depth Width

Type P125 4U (177mm) 226mm 20 TE
Type P126 & P127 4U (177mm) 226mm 30 TE
P12y/EN FT/E95 User Guide

Page 6/94 MiCOM P125/P126 & P127

The hinged covers at the top and bottom of the relay are shown closed. Extra physical
protection for the front panel can be provided by an optional transparent front cover; this
allows read only access to the relays settings and data but does not affect the relays IP
rating. When full access to the relay keypad is required to edit the settings, the transparent
cover can be unclipped and removed when the top and bottom hinged covers are open. If
the lower cover is secured with a wire seal, this will need to be removed. Using the side
flanges of the transparent cover, pull the bottom edge away from the relay front panel until it
is clear of the seal tab. The cover can then be moved vertically down to release the two
fixing lugs from their recesses in the front panel.
1.1.2 Front Panel Description
MiCOM P125, P126 and P127 relay front panel allows the user to easily enter relay settings,
display measured values and alarms and to clearly display the status of the relay.

FIGURE 1: MiCOM P125, P126 AND P127 FRONT PANEL DESCRIPTION

The front panel of the relay has three separate sections:

1. The LCD display and the keypad,
2. The LEDs,
3. The two zones under the upper and lower flaps.
NOTE: Starting from Hardware 5, there is no need of battery in the front of the
relay. Indeed, disturbance, fault and event records are stored on a
flash memory card that doesn’t need to be backed up by a battery.
The compartment is fitted with a blanking cover.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 7/94

1.1.3 LCD display and keypad description

The front panel components are shown below. The front panel functionality is identical for
the P125, P126 & P127 relays.
1.1.3.1 LCD display
In the front panel, a liquid crystal display (LCD) displays settings, measured values and
alarms. Data is accessed through a menu structure.
The LCD has two lines, with sixteen characters each. A back-light is activated when a key is
pressed and will remain lit for five minutes after the last key press. This allows the user to be
able to read the display in most lighting conditions.

1.1.3.2 Keypad
The keypad has seven keys divided into two groups:

• Two keys located just under the screen (keys  and c).

Keys  and c are used to read and acknowledge alarms. To display successive alarms,
press key c. Alarms are displayed in reverse order of their detection (the most recent alarm
first, the oldest alarm last). To acknowledge the alarms, the user can either acknowledge
each alarm using  or go to the end of the ALARM menu and acknowledge all the alarms
at the same time.
When navigating through submenus, key  is also used to come back to the head line of
the corresponding menu.
NOTE: To acknowledge a relay latched refer to the corresponding submenu
section.

• Four main keys , , ,  located in the middle of the front panel.

They are used to navigate through the different menus and submenus and to do the setting
of the relay.
The key  is used to validate a choice or a value (modification of settings).
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Page 8/94 MiCOM P125/P126 & P127

1.1.4 LEDs
The LED labels on the front panel are by default written in English, however the user has
self-adhesive labels available with MiCOM relays on which it is possible to write using a ball
point pen.
The top four LEDs indicate the status of the relay (Trip condition, alarm LED, equipment
failure, auxiliary supply).
The four lower LEDs are freely programmable by the user and can be assigned to display a
threshold crossing for example (available for all models) or to show the status of the logic
inputs.The description of each one of these eight LEDs located in the left side of the front
view is given hereafter (numbered from the top to bottom from 1 to 8):

LED 1

LED 8 P3951ENa

LED 1 Colour: RED Label: Trip

LED 1 indicates when a trip command has been issued by the relay to the cut-off element
(circuit breaker, protection trip). This LED copies the trip command issued to the trip output
relay contact (RL1). In its normal state the LED is not lit. It is illuminated as soon as a trip
order is issued. It is reset when the associated alarm is acknowledged.
LED 2 Colour: ORANGE Label: Alarm
LED 2 indicates that an alarm has been registered by MiCOM P125, P126 & P127 relays.
The alarms are either threshold crossings (instantaneous) or tripping orders (time delayed).
The LED will flash until the alarms have been accepted (read key), after which the LED will
change to constant illumination. It will extinguish when the alarms have been cleared (clear
key) and the trip cause is reset.
LED 3 Colour: ORANGE Label: Warning
LED 3 is dedicated to the internal alarms of MiCOM P125, P126 & P127 relays.
When a "non critical" internal alarm (i.e. a communication fault) is detected, the LED flashes
continuously. When the fault is classed as "critical", the LED is illuminated continuously. The
LED only extinguishes after the cause that provoked this fault has been removed (i.e. repair
of the module, disappearance of the fault).
LED 4 Colour: GREEN Label: Healthy
LED 4 indicates that MiCOM P125, P126 and P127 relays are in correct working order and
the auxiliary power supply is present.
LED 5 to 8 Colour: RED Label: Aux.1 to 4.
These LEDs can be programmed by the user on the basis of information on available
thresholds (instantaneous and time-delayed). The user selects the information he wishes to
see associates with each LED from the menu element (Logic OR). Each LED illuminates
when the associated information is valid. The extinguishing of each LED is linked to the
acknowledgement of the associated alarms.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 9/94

1.1.5 Description of the two areas under the top and bottom flaps
1.1.5.1 Relay Identification
Under the top hinged cover there is an adhesive paper label that contains the relay model
number, serial number, sensitive earth current range, rating information and the Cortec code
for ordering etc.
Each item on the label is described below:

P127CAF11: CORTEC code

This code allows the user to identify
the characteristics of the relay.
No.: 0000000: Serial number
Cde: 00000/000: Reference to the
purchasing order.
These numbers are needed when
contacting Schneider Electric in case of
problems.
Un = 57 – 130V: Voltage input range.
Modbus: Communication protocol of
the RS485 communication port situated
on the rear of the relay.
0.002 Ien: Sensitivity of the earth fault
current (available are three sensitivity
levels).
Ua = 48-150V DC: Auxiliary power
supply range. In this example, the
power supply must be a DC voltage.

1.1.5.2 Battery compartment (no longer used) and Communication Port

Under the bottom hinged cover of the relay there was a battery compartment to hold the
½AA size battery, which is no longer used. Starting from Hardware 5, disturbance, fault and
event records are stored on a flash memory card that doesn’t need to be backed up by a
battery. Therefore battery in the front compartment of the relay are no longer needed. The
battery compartment is fitted with a blanking cover.
Next to the (empty) battery compartment there is a 9-pin female D-type socket, which can be
used to communicate with a local PC (up to 15m distance) via a RS232 serial data link cable
(SK1 port).
1.1.5.3 The USB/RS232 cable (to power and set the relay)
The USB/RS232 cable is able to perform the following functions:
1. It is able to power the relay from its front port. This allows the user to view or modify
data on the relay even when the auxiliary power supply of the relay has failed or when
the relay is not connected to any power supply. The USB port of the PC supplies the
power necessary to energize the relay. This lasts as long as the battery of the PC can
last.
2. It provides an USB / RS 232 interface between the MiCOM relay and the PC. This
allows the user to be able to change the setting of the relay using a PC with its USB
port.
It eases the use of the relay allowing the retrieval of records and disturbance files for
example when the auxiliary supply has failed or is not available.
The associated driver (supplied with the relay) needs to be installed in the PC. For more
information , please refer to MiCOM E2 User Manual.
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Page 10/94 MiCOM P125/P126 & P127

1.1.6 Description of rear Terminal Block for P125, P126 & P127
1.1.6.1 Description of rear Terminal Block for P125

Case earth

1 2 29 30
3 4 31 32
5 6 33 34
7 8 35 36
9 10 37 38
11 12 39 40
13 14 41 42
15 16 43 44
17 18 45 46
19 20 47 48
21 22 49 50
23 24 51 52
25 26 53 54
27 28 55 56

Module terminal blocks

viewed from rear
(with integral case earth link)
P0071ENb

Output 5 1 2 Common Case earth 29 30 Terminal

output 1 connection RS485
Common 3 4 Output 1 RS485 - 31 32 RS485 +
output 5 (NC) terminal
Output 6 5 6 Output1 Vaux 33 34 Vaux
(NO) + terminal – terminal
Common 7 8 Common Relay failed 35 36 Common
output 6 output 2 (WD) "Watchdog
"

9 10 Output 2 Relay healthy 37 38

(NC) (WD)

11 12 Output 2 Residual volt. 39 40 Residual

(NO) input volt. input

13 14 Output 3 41 42

15 16 Common 43 44
output 3
Input 3 17 18 Output 4 45 46
+ terminal
Input 3 19 20 Common Current input 47 48 Current
– terminal output 4 (5A) input (5A)
Input 4 21 22 Input 1 49 50
+ terminal + terminal
Input 4 23 24 Input 1 51 52
– terminal – terminal

25 26 Input 2 53 54
+ terminal

27 28 Input 2 Current input 55 56 Current

– terminal (1A) input (1A)
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 11/94

1.1.6.2 Description of rear Terminal Block for P126

Case earth

57 58 1 2 29 30
59 60 3 4 31 32
61 62 5 6 33 34
63 64 7 8 35 36
65 66 9 10 37 38
67 68 11 12 39 40
69 70 13 14 41 42
71 72 15 16 43 44
73 74 17 18 45 46
75 76 19 20 47 48
77 78 21 22 49 50
79 80 23 24 51 52
81 82 25 26 53 54
83 84 27 28 55 56

Module terminal blocks

viewed from rear
(with integral case earth link)
P0072ENb

Input 7 57 58 Input 6 Output 5 1 2 Common Case earth 29 30 Terminal

+ terminal + terminal output 1 connection RS485
Input 7 59 60 Input 6 Common 3 4 Output 1 RS485 - 31 32 RS485 +
– terminal – terminal output 5 (NC) terminal
61 62 Output 6 5 6 Output1 Vaux 33 34 Vaux
(NO) + terminal – terminal
63 64 Common 7 8 Common Relay failed 35 36 Common
output 6 output 2 (WD) "Watchdog"
65 66 Common 9 10 Output 2 Relay 37 38
output 7 (NC) healthy
(WD)
67 68 Output 7 11 12 Output 2 39 40
(NO)
69 70 Common 13 14 Output 3 Current input 41 42 Current
output 8 IA (5A) input IA (5A)
71 72 Output 8 15 16 Common Current input 43 44 Current
output 3 IB (5A) input IB (5A)
Voltage 73 74 Voltage Input 3 17 18 Output 4 Current input 45 46 Current
input Vr input Vr + terminal IC(5A) input IC(5A)
75 76 Input 3 19 20 Common Current input 47 48 Current
– terminal output 4 Ie (5A) input Ie(5A)
77 78 Input 4 21 22 Input 1 Current input 49 50 Current
+ terminal + terminal IA (1A) input IA (1A)
79 80 Input 4 23 24 Input 1 Current input 51 52 Current
– terminal – terminal IB (1A) input IB (1A)
81 82 Input 5 25 26 Input 2 Current input 53 54 Current
+ terminal + terminal IC (1A) input IC (1A)
83 84 Input 5 27 28 Input 2 Current input 55 56 Current
– terminal – terminal Ie (1A) input Ie (1A)
P12y/EN FT/E95 User Guide

Page 12/94 MiCOM P125/P126 & P127

1.1.6.3 Description of rear Terminal Block for P127

Case earth

Module terminal blocks

viewed from rear
P0072ENc
(with integral case earth link)

Input 7 57 58 Input 6 Output 5 1 2 Common Case earth 29 30 Terminal

+ terminal + terminal output 1 connection RS485
Input 7 59 60 Input 6 Common 3 4 Output 1 RS485 - 31 32 RS485 +
– terminal – terminal output 5 (NC) terminal
Input 8 61 62 Input COM Output 6 5 6 Output1 Vaux 33 34 Vaux
(1) (1)
+ terminal – terminal (NO) + terminal – terminal
Input A 63 64 Input 9 Common 7 8 Common Relay failed 35 36 Common
(1) (1)
+ terminal + terminal output 6 output 2 (WD) "Watchdog"
Input C 65 66 Input B Common 9 10 Output 2 Relay 37 38
(1) (1)
+ terminal + terminal output 7 (NC) healthy (WD)
(3) (3)
Current I1 67 68 Current I1 Output 7 11 12 Output 2 39 40
meas. 1A/5A meas. 1A/5A (NO)
Voltage 69 70 Voltage input Common 13 14 Output 3 Current input 41 42 Current
input VA VA output 8 IA (5A) input IA (5A)
Voltage 71 72 Voltage input Output 8 15 16 Common Current input 43 44 Current
input VB VB output 3 IB (5A) input IB (5A)
Voltage 73 74 Voltage Input 3 17 18 Output 4 Current input 45 46 Current
input VC/Vr input VC/Vr + terminal IC(5A) input IC(5A)
(3) (3)
Current I2 75 76 Current I2 Input 3 19 20 Common Current input 47 48 Current
meas. 1A/5A meas. 1A/5A – terminal output 4 Ie (5A) input Ie(5A)
Case earth 77 78 RS485-2 Input 4 21 22 Input 1 Current input 49 50 Current
(2) (2)
connection term. Z + terminal + terminal IA (1A) input IA (1A)
RS485-2 79 80 RS485-2 Input 4 23 24 Input 1 Current input 51 52 Current
(2) (2)
– terminal + terminal – terminal – terminal IB (1A) input IB (1A)
IRIG-B mod 81 82 IRIG-B mod Input 5 25 26 Input 2 Current input 53 54 Current
(2) (2)
– terminal + terminal + terminal + terminal IC (1A) input IC (1A)
IRIG-B dem 83 84 IRIG-B dem Input 5 27 28 Input 2 Current input 55 56 Current
(2) (2)
– terminal + terminal – terminal – terminal Ie (1A) input Ie (1A)
(1)
Available only for P127 “5 opto-inputs” option (product codes P127xx1 or P127xx3).
“Input COM – terminal” is the common terminal for inputs 8 to 12.
(2)
Available only for P127 “IRIG-B and 2nd rear port option” option (product codes P127xx2
or P127xx3).
The “81” and “82” terminals are used to connect the optional BNC adaptor. This one must
be plugged according to the “+” and “GND” positions marked on the adaptor.
(3)
With I1 = IA or IB or IC and I2 = IA or IB or IC. Available only for P127 with additional
measurement CT option (product codes P127xx4, P127xx5, P127xx6 or P127xx7).
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 13/94

1.2 Menu structure

The relay’s menu is arranged in a tabular structure. Each setting in the menu is referred to
as a cell, and each cell in the menu may be accessed by reference to a row and column
address. The settings are arranged so that each column contains related settings, for
example all of the disturbance recorder settings are contained within the same column. As
shown in the figure, the top row of each column contains the heading that describes the
settings contained within that column. Movement between the columns of the menu can only
be made at the column heading level. A complete list of all of the menu settings is given in
the Menu Content tables (P12y/EH HI section).

Column header

OP
Config. Measur. Comm. Protections Autom. Ctrl Records
param

Column
data
settings

P0106ENb

MENU STRUCTURE
1.3 Password
1.3.1 Password Protection
Password protection is applicable to most of the relay settings, especially to the selection of
the various alarm thresholds, trip thresholds, communication parameters, allocation of logic
inputs and outputs.
The password consists of four capital characters. When leaving the factory, the password is
set to AAAA. The user can define any combination of four characters.
Should the password be lost or forgotten, modification of the stored parameters is blocked. It
is then necessary to contact the manufacturer or his agent and a stand-by password specific
to the relay concerned may be obtained.
The programming mode is indicated with the letter "P" on the right hand side of the display
on each menu heading. The letter "P" remains present as long as the password is active
(5 minutes if there is no action on the keypad).
1.3.2 Password Entry
The input of the password is requested as soon as a modification of a parameter is made for
any one of the six/eight menus and the submenus. The user enters each of the 4 characters
and then validates the entire password with .

After 5 seconds, the display returns to the point of the preceding menu.
If no key is pressed inside of 5 minutes, the password is deactivated. A new password
request is associated with any subsequent parameter modification.
P12y/EN FT/E95 User Guide

Page 14/94 MiCOM P125/P126 & P127

1.3.3 Changing the Password

To change an active password, go to the OP. PARAMETERS menu and then to the
Password submenu. Enter the current password and validate. Then press  and enter the
new password character by character and validate the new password using .

The message NEW PASSWORD OK is displayed to indicate that the new password has
been accepted.
1.3.4 Change of Setting Invalidation
The procedure to modify a setting is shown in the next part of this document.
If during this action it occurs the need to get back to the old setting it is necessary push the
 key before validating the setting change. After this action the following message will
appear on the LCD for some seconds and the old setting will be maintained.

UPGRADE
CANCEL

1.4 Displays of Alarm & Warning Messages

Alarm messages are displayed directly on the front panel LCD. They have priority over the
default current value. As soon as an alarm situation is detected by the relay (threshold
crossing for example), the associated message is displayed on the MiCOM relay front panel
LCD and the LED Alarm (LED 2) lights up.
The alarm and warning messages are classed as follows:
– Alarm messages generated by the electrical power network.
– Warning messages caused by hardware or software faults from the relay.
1.4.1 Electrical Network Alarms
Any crossing of a threshold (instantaneous or time delay) generates an "electrical network
alarm". The involved threshold is indicated. Regarding the phase thresholds, the phase
designation (A, B or C) is also displayed.
If several alarms are triggered, they are all stored in their order of appearance and presented
on the LCD in reverse order of their detection (the most recent alarm first, the oldest alarm
last). Each alarm message is numbered and the total stored is shown.
The user can read all the alarm messages by using c.
The user acknowledges and clears the alarm messages from the LCD by using .
The user can acknowledge each alarm message one by one or all by going to the end of the
list to acknowledge, and clear, all the alarm messages by using .
The control of the ALARM LED (LED 2) is directly assigned to the status of the alarm
messages stored in the memory.
If one or several messages are NOT READ and NOT ACKNOWLEDGED, the ALARM LED
(LED 2) flashes.
If all the messages have been READ but NOT ACKNOWLEDGED, the ALARM LED (LED 2)
lights up continuously.
If all the messages have been ACKNOWLEDGED, and cleared, if the cause was reset, the
ALARM LED (LED 2) is extinguished.
1.4.2 Relay Hardware or Software Warning Messages
Any software or hardware fault internal to MiCOM relay generates a "hardware/software
alarm" that is stored in memory as a "Hardware Alarm". If several hardware alarms are
detected they are all stored in their order of appearance. The warning messages are
presented on the LCD in reverse order of their detection (the most recent first and the oldest
last). Each warning message is numbered and the total stored is shown.
The user can read all warning messages by using c, without entering the password.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 15/94

The acknowledgement, and clearing, of a warning message caused by internal relay

hardware or software faults is not possible. A warning message can only be made to
disappear if the cause of the fault has been removed.
The control of the WARNING LED (LED 3) is directly assigned to the status of the warning
messages stored in the memory:
The Watch Dog relay controls the correct operation of the protection and automation
function. This relay fault “RL0 relay” is activated if the following functions or checks are
faulty:

− microprocessor operation,

− power supply check,

− reconstituted internal power supply check,

− heating of a circuit board component monitoring,

− analog channel monitoring (acquisition sampling),

− programm execution monitoring,

− communication ports monitoring.

If the internal hardware or software fault is major (i.e. the relay cannot perform protection
functions), the WARNING LED (LED 3) lights up continuously.
If the internal hardware or software fault is minor (i.e. a communication failure that has no
influence on the protection and automation functions), the WARNING LED (LED 3) will flash.
Warning messages caused by internal hardware or software faults are:
< CALIBRATION ERROR >>
<< CLOCK ERROR >>
<< DEFAULT SETTINGS (*) >>
<< SETTING ERROR (**) >>
<< CT ERROR >>
<< COMMUNIC. ERROR >>
<< WATCH DOG >>
<< STAT RESET>>
(*) DEFAULT SETTINGS: Each time the relay is powered ON it will check its memory
contents to determine whether the settings are set to the factory defaults. If the relay detects
that the default settings are loaded an alarm is raised. The ALARM LED (YELLOW) will light
up and the Watch Dog contact will be activated.
Only one parameter in the relay's menu needs to be changed to suppress these messages
and to reset the watch dog. This alarm is only an indication to the user that the relay has its
default settings applied.
(**) SETTING ERROR: Should the CPU fails to get correctly store data during a setting
change, a "HARDWARE" ALARM will appear on the LCD display followed by "SETTING
ERROR" message (when pushing on the button). In addition, the ALARM LED (YELLOW)
will light up and the Watch Dog contact will be activated To reset this alarm it is necessary to
power ON and OFF the relay. Following this, the last unsuccessful setting change will then
need to be re-applied. If the alarm persists, i.e. the "SETTING ERROR" alarm is still
displayed, please contact Schneider Electric After Sales Services for advice and assistance.
Possible software alarm messages are:
I> instantaneous 1st threshold directional/non directional overcurrent.
tI> time delayed 1st threshold directional/non directional overcurrent.
P12y/EN FT/E95 User Guide

Page 16/94 MiCOM P125/P126 & P127

For the I> and tI> a particular attention has to be taken.

The P126 & P127 are able to identify the phase where the fault occurs, and the relevant
alarm messages are shown in the below listed table.

Menu’ ALARMS
I> PHASE tI> PHASE
A A
A A
B B
B B
C C
C C
A A
AB AB
AB AB
A A
AB AB
ABC ABC
ABC ABC
ABC ABC
ABC ABC
ABC ABC
ABC ABC

The following messages are sorted in alphabetical order.

The following table gives the list of alarms (sorted in alphabetical order) with description and
type of acknowledgement. The five types of acknowledgement of alarm are:

− Man = alarm must be acknowledged manually (front panel or communication port),

− Self = self reset when time delayed alarm occurs (i.e. I> alarm is acknowledged when
tI> occurs),
− Inhib = the alarm can be inhibited by setting (“CONFIGURATION/Alarms” menu),
− Auto = alarm is automatically acknowledged when the event disappears,
− manual reset using “ORDERS / Record Reset” menu.

Alarm Description Type

ΣAmps(n) total Total measured current broken by CB is higher man
than the value set in AUTOMAT. CTRL/CB
Supervision menu.
Recloser[79] re-close (internal or external) blocking signal. auto
Blockedint. Generated by:
locked – external breaker failure signal (ex. SF6 low).
[79] ext. locked – signal provided via logic input assigned to the CB
Fail function in the AUTOMAT. CTRL/Inputs menu.
– external blocking signal. External blocking can be set
by the user in the PROTECTION G1 / [79]
AUTORECLOSE/Ext Block menu. This blocking signal
is provided via a logic input assigned to the Block_79
function in the AUTOMAT. CTRL/Inputs menu.
– definitive trip.
– breaker operating time (or tripping time) longer than
the set time, but only if the function is enabled.
– Trip of protection (See AP document for further
information)
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 17/94

Alarm Description Type

Brkn.Cond. Broken conductor signal. I2/I1 element threshold man
exceeded for longer than tBC; tBC is settable in the
AUTOMAT. CTRL/Broken Conductor menu.
CB Fail Circuit breaker failure signal; the CB does not trip on man
Tbf (time-out). tBF is settable in the AUTOMAT.
CTRL/CB Fail menu.
CB Open NB number of circuit breaker operation higher that the man
value set in the AUTOMAT. CTRL/CB Supervision
menu.
Conflict Recloser configuration conflict of the re-close function. This auto
signal is generated by:
– None digital input assigned to the position of the CB
52a
– no output relay assigned to the CB Close function
(AUTOMAT. CTRL/Output Relays menu ).
– None protection is assigned to the trip command
– no re-close cycle assigned to the protection
functions (PROTECTION G1/ [79] Autoreclose menu ).
CTS Current Transformer Supervision alarm auto
dF/dt1 to dF/dt6 Rates of change of frequency (1 to 6). man
EQU. A to EQU. Equation logic A, B, C, D, E, F, G or H set inhib
H
F OUT Frequency out of range man
st nd rd th th th
F1 to F6 Instantaneous 1 , 2 , 3 , 4 , 5 and 6 frequency man & self
threshold
I< alarm threshold undercurrent fault man & self
nd
I>> 2 alarm threshold directional/non directional man & self
overcurrent
I>>> 3rd alarm threshold directional/non directional man & self
overcurrent
I2> 1st alarm threshold negative sequence overcurrent man & self
nd
I2>> 2 alarm threshold negative sequence overcurrent man & self
rd
I2>>> 3 alarm threshold negative sequence current man & self
st
Ie> 1 alarm threshold directional/non directional earth man & self
fault
Ie>> 2nd alarm threshold directional/non directional earth man & self
fault
Ie>>> 3rd alarm threshold directional/non directional earth man & self
fault
Ie>>>> Derived earth overcurrent threshold man & self
Latched Relays at least one output relay is latched. auto
Maintenance The relay is in Maintenance mode auto
mode
P< 1st alarm threshold active underpower man & self
P<< 2nd alarm threshold active underpower man & self
st
P> 1 alarm threshold active overpower man & self
P>> 2nd alarm threshold active overpower man & self
P12y/EN FT/E95 User Guide

Page 18/94 MiCOM P125/P126 & P127

Alarm Description Type

Pe/IeCos> 1st alarm threshold wattmetric/IeCos earth fault man & self
nd
Pe/IeCos>> 2 alarm threshold wattmetric/IeCos earth fault man & self
Q< 1st alarm threshold reactive underpower man & self
nd
Q<< 2 alarm threshold reactive underpower man & self
Q> 1st alarm threshold reactive overpower man & self
nd
Q>> 2 alarm threshold reactive overpower man & self
Recloser successful re-close signal. Indicates that the fault has auto
Successful been cleared upon circuit breaker re-closure, and has
not re- appeared before expiry of the reclaim time.
SF6 Low faulty circuit breaker signal at assignable logic input auto
(set in AUTOMAT. CTRL/Inputs menu).
t U< 1st trip threshold undervoltage inhib
nd
t U<< 2 trip threshold undervoltage inhib
tAux1 to tAuxC timer t Aux1 (to tAux C) associated with logic input inhib
Aux1 (tAux2, 3…C) Alarm occurs when the timer is
expired and for any output relay assignement
tF1 to tF6 Time delayed 1st, 2nd, 3rd, 4th, 5th and 6th frequency man
threshold
Thermal Alarm threshold thermal alarm man
Thermal thermal overload trip man
Overload
tI< trip threshold undercurrent fault man
tI> 1st trip threshold directional/non directional overcurrent man
nd
tI>> 2 trip threshold directional/non directional overcurrent man
tI>>> 3rd trip threshold directional/non directional overcurrent man
st
tI2> 1 trip threshold negative sequence overcurrent man
tI2>> 2nd trip threshold negative sequence current man
rd
tI2>>> 3 trip threshold negative sequence current man
tIe> 1st trip threshold directional/non directional earth fault man
nd
tIe>> 2 trip threshold directional/non directional earth fault man
tIe>>> 3rd trip threshold directional/non directional earth fault man
tIe>>>> Time delayed derived earth overcurrent threshold man
Toperating CB operating Operating (or tripping) time of the circuit man
breaker longer than the value set in the AUTOMAT.
CTRL/CB Supervision menu.
tP< 1st trip threshold active underpower man
tP<< 2nd trip threshold active underpower man
st
tP> 1 trip threshold active overpower man
tP>> 2nd trip threshold active overpower man
st
tPe/IeCos> 1 trip threshold wattmetric/IeCos earth fault man & self
tPe/IeCos>> 2nd trip threshold wattmetric/IeCos earth fault man & self
st
tQ< 1 trip threshold reactive underpower man
tQ<< 2nd trip threshold reactive underpower man
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 19/94

Alarm Description Type

tQ> 1st trip threshold reactive overpower man
nd
tQ>> 2 trip threshold reactive overpower man
Trip Circuit Circuit breaker trip circuit failure for longer than the man
Super. supervision timer t SUP settable in the
AUTOMAT.CTRL/CB Supervision menu or RL1
energised (trip circuit supervision not enabled).
tU> 1st trip threshold overvoltage man
nd
tU>> 2 trip threshold overvoltage man
tUe>>>> trip threshold residual overvoltage man
st
U< 1 alarm threshold undervoltage inhib & self
nd
U<< 2 alarm threshold undervoltage inhib & self
st
U> 1 alarm threshold overvoltage man & self
nd
U>> 2 alarm threshold overvoltage man & self
Ue>>>> alarm threshold residual overvoltage man & self
VTS VTS alarm (internal VT fault, overloading, or faults on auto
the interconnecting wiring) if enable (VT
Supervision/VTS Alarm? = yes).

1.5 General characteristics

1.5.1 Analogue Inputs
The analogue inputs for each relay are shown in the following table:

MiCOM MiCOM MiCOM

Type of Analogue Inputs
P125 P126 P127

Phase current inputs (Protection CTs) 3 3

Optional phase current inputs
2
(Measurements CTs)
Earth current inputs (high, medium, low
1 1 1
sensitivity by Cortec code)
Residual voltage input 1 1 1/0
Phase to neutral or phase to phase voltage
2/3
inputs
Total analogue inputs 2 5 7

Following is a description of the voltage inputs connection for the P127 relay.
Case A
2 phase to neutral voltage inputs
1 residual voltage input
VC is then calculated as VC= – (VA+ VB)
To obtain a correct reading of the input voltage the exact voltage transformer ratio for Ve has
to be set.
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Page 20/94 MiCOM P125/P126 & P127

Case B
2 phase to phase voltage inputs
VCA is then calculated as VCA= –(VAB + VBC)
Case C
3 phase to phase voltage inputs
No residual voltage input
Ve can be calculated as Ve = (VA+ VB+ VC )/3

• On the MiCOM P125 relays rear terminals there is one current input rated 1A and one
current input rated 5A available and one voltage input. On the MiCOM P126 relay rear
terminals there are four current inputs rated 1A and four current inputs rated 5A
available and one voltage input. On the MiCOM P127 relay rear terminals there are
four current inputs rated 1A and four current inputs rated 5A available and three
voltages input.

• By using the Cortec code (see the appropriate section) the user can choose the
voltage range for voltage inputs for the MiCOM P125 & P126 (one input) and P127
(three inputs).
All logic outputs can be programmed to respond to any of the available control or protection
functions. Logic inputs can be assigned to various control functions.
All logic digital inputs can be programmed to respond to any of the available control or
protection functions. Their supply level is the same as the power supply selected of the relay
by Cortec. They can be supplied in A.C or D.C current by Cortec choice.
The MiCOM relays are powered either from a DC or an AC auxiliary power supply.
Any short time voltage interruption (<50ms) is filtered and regulated through the auxiliary
power supply.
The front panel enables the user to navigate through the menu to access data, change
settings, read measurements etc.
Eight LEDs on the front panel allow a clear and simple presentation of events. The various
detected alarms are stored and can be displayed on the back-lit LCD.
No Password is required to read and acknowledge (clear) these alarm messages.
On their rear terminals the MiCOM P125, P126 & P127 relays have a standard RS485 port
available. The user can choose, by ordering, the communication protocol ModBus RTU, IEC
60870-5-103 or DNP3 (when available).
Using the communication channel RS485, all stored information (measurements, alarms,
and parameters) can be read and the settings can be modified if this functionality is allowed
by the chosen protocol.
Evaluation and modification of this data can be carried out on site with a normal PC and the
appropriate Schneider Electric software.
RS485 based communication allows MiCOM P125, P126 & P127 relays to be directly linked
to a digital control system.
All the available data is then placed at the disposal of the supervisor and can be processed
either local or remotely.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 21/94

2. MENU
The menu for the MiCOM P125, P126 & P127 relays is divided into the following sections.
To access these menus from the default display press .

To return to the default display from these menus or submenus press .

DEFAULT
DEFAULT
DISPLAY
DISPLAY OP
OPPARAMETERS
PARAMETERS

ORDERS
ORDERS

CONFIGURATION
CONFIGURATION

MEASUREMENTS
MEASUREMENTS

METERING
METERING

When displayed

COMMUNICATION
COMMUNICATION

PROTECTION
PROTECTIONGx
x = 1,2 or 1 to 8
(P127)

AUTOMAT.
AUTOMAT.CTRL
CTRL

RECORDS
RECORDS

P0003ENe
P12y/EN FT/E95 User Guide

Page 22/94 MiCOM P125/P126 & P127

2.1 OP PARAMETERS menu

To gain access to the OP PARAMETERS menu from the default display, press .

OP PARAMETERS Heading of OP PARAMETERS menu.

To gain access to the menu content, press .

Password Entry of the password to be able to modify the MiCOM

**** relay settings and parameters (see § 1.3).

Password The password entry is made letter by letter, using  or

AAAA  to go up or down in the alphabet. After each letter,
press  to enter the following letter. At the end press 
to validate the password. If the password is correct, the
following message is displayed on the LCD:
PASSWORD OK.
The password is initially set in the factory to AAAA.

WARNING: NO SETTING CHANGES DONE EITHER LOCALLY (THROUGH RS232)

OR REMOTELY (THROUGH RS485) WILL BE ALLOWED DURING THE 5
FIRST MINUTES FOLLOWING A CHANGE OF PASSWORD.

Language Indicates the language used in the display.

ENGLISH
Description Indicates the type of relay, the near number is the sensitivity
P125-2 for the earth input circuit: from 0.1 to 40 Ien, from 0.01 to 8
Ien and from 0.002 to 1 Ien.
Reference Displays the reference number that lists the equipment
AREV associated with the relay.

Software Version Displays the software version downloaded.

xx.x
Frequency Nominal value of the network frequency. Select either 50 or
50 Hz 60 Hz.

Active Group This window displays the active protection and automatic
1 features group.The display value can be 1 or 2 for
P125/P126 and 1 to 8 for P127.
Input 7654321 Displays the status of the logic Inputs.
Status 0110110 Logic inputs are numbered from 1 to 4 for P125 and 1 to 7
for P126 and P127. When the indicated status is
- 0 the logic input is inactive,
- 1 the logic input is active.
Input CBA98 Displays the status of the logic Inputs 8 to 12, only for P127
Status 00000 “5 opto-inputs” option (product codes P127xx1 or P127xx3).

Relay 87654321 Displays the status of the logic outputs.

Status 01011101 Logic output relays are numbered from 1 to 6 for P125 and
1 to 8 for P126 and P127.
When the indicated status is:
- 1 the logic output relay is active,
- 0 the logic output relay is inactive.
To activate an unlatching operation, the password is
requested.
NOTE: The Watch-dog output (RL0) is not displayed in the
output status menu.
Date Displays the date (10/11/01 = November 10th 2001).
10/11/01
Time Displays the time (13:57:44 = 1:57:44 pm).
13:57:44
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 23/94

2.2 ORDERS menu

This menu gives the possibility:

− to send open or close orders to the Circuit Breakers from the front panel. Open and close
orders are written in the event file. This action generates a “Control Trip” alarm, which can
be inhibited. If inhibited, the “trip” LED and the “Alarm” LED are not lit if the relay RL1 is
ordered by a control trip information (affected to an input in the “configuration/inputs”
submenu).

− to start a disturbance recording from the protection relay.

ORDERS Heading of the ORDERS menu.

Record reset P127 only

No “Record reset” clears LEDs, alarms, counters,
disturbance records, fault records, disturbance records
triggers, event records, measurements values (maximum
phase currents), CB monitoring records (“CB opening
time” and “CB closing time” values).
The reset order does not reset the latched trip output
relay RL1 or the latched output relays.
To change the setting, enter the password (if necessary).
In the “confirmation ?” cell, select Yes to apply the reset.
Open Order Sends manually an open order from the local control
No panel. This order is permanently assigned to the Trip
output relay (selected with “automatic control/output
relay” menu).
Setting range: No, Yes. (the “confirmation ?” cell will be
displayed after setting change).
Close Order Sends manually a close order from the local control
No panel: RL2 to RL8 (if configured).
Setting range: No, Yes (the “confirmation ?” cell will be
displayed after setting change).
Disturb rec start Trigs a disturbance recording from the relays HMI.
No Setting range: No, Yes (the “confirmation ?” cell will be
displayed after setting change).
P12y/EN FT/E95 User Guide

Page 24/94 MiCOM P125/P126 & P127

2.3 CONFIGURATION menu

The following parameters can be set in the CONFIGURATION menu:

• labels used to display currents and voltages,

• ratios for the earth and phase current transformers (CT),

• ratios for the phase measurements current transformers (CTm),

• ratios for the residual voltage and phase voltage transformers (VT),

• LEDs 5 to 8 assigned to several functions,

• The polarisation of the digital inputs by voltage present or lacking,

• The possibility to have the trip relay normally ON or OFF,

• The choice to enable alarms functionality as well as self reset on trip or instantaneous
protection or other function,

• By the maintenance way to drive the output relays,

• To set the management date for the network in using.

The submenus are:

 CONFIGURA-   
TION
       
 General (1)  Transfo. ratio  Led 5  Led 6
options   

 Led 7  Led 8  Inputs  Output

   configuration  relays
 Group  Alarms  Date 
 Select  
(1) P126 and P127 only
To gain access to the CONFIGURATION menu from the default display, press  followed
by  until the desired submenu header is displayed.

2.3.1 Submenu General Options

The following submenu displays the connection mode only for the P127 and the default and
phase rotation display only for the P126.The default display is fixed to IN and there is no VT
connection setting choice.

CONFIGURATION Heading of CONFIGURATION menu.

General Options Heading of General Options submenu (1).

VT Connection P127 only

2Vpp+Vr Selection of the VT connection type (3Vpn, 2Vpp+Vr, 2Vpn+Vr).
3Vpn = 3 Phase-Neutral connection
2Vpp+Vr = two phase to phase plus an open delta connection
2Vpn+Vr = two phase to neutral plus an open delta connection
See § 2.3.2 to select VTs configuration
VT Protection P127 only, visible only if VT connection is “2Vpn+Vr” or “3Vpn”.
Protect P–N Selection of the protection type : Phase – Phase or Phase -
Neutral
Setting choice “Protect P-N”, “Protect P-P”.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 25/94

Phase rotation P126 and P127 only

A-B-C Choose the phase rotation between either A-B-C or A-C-B.

CTm1 phase ? P127 only

none Configuration the first measurement CT phase: select the
phase physically connected to CTm1.
(Setting choices: none, IA, IB, IC)
CTm2 phase ? P127 only
none Configuration the second measurement CT phase: select
the phase physically connected to CTm2.
(Setting choices: none, IA, IB, IC)
Quadrant conv ? P127 only
Quadrant 1 Configuration of the active and reactive power quadrant
according to the following diagram.
(Setting choices: 1 to 4)
Im (+)

Quadrant 2 Quadrant 1

V
Re (–) Re (+)

Quadrant 3 Quadrant 4

Im (–)
P3976ENa

Default Displays P126 and P127 only

RMS IA IB IC IN Configuration of the default current value displayed on the
LCD panel, by selecting either Phase A (“RMS IA”), Phase
B (“RMS IB”), Phase C (“RMS IC”), Earth N (“RMS IN”) or
the four values simultaneously) (“RMS IA IB IC IN”).
If the four values are simultaneously chosen, the values will
be displayed as follows:
IA RMS current IB RMS current
IC RMS current IN RMS current
Setting choice: “RMS IA”, “RMS IB”, “RMS IC”, “RMS IN” or
“RMS IA IB IC IN.”
Earth Text P125 only
N Choose a label (displayed with the associated
measurement value or in alarms messages) for earth.
Possible choices: N, o or E (modified after entering the
password).
Phases/Earth Text P126 and P127 only
L1 L2 L3 N Choose a label (displayed with the associated
measurement value, in alarms messages or in the default
display) for the 3 phases and earth.
Possible choices: “L1 L2 L3 N”, “A B C o” or “R S T E”
(modified after entering the password).
Iam Tdd denom P127 only, with CT connected (measurement CT option).
xx A Set the value of IL (magnitude of the load of the system). IL
is used to calculate the Total Demand Distorsion (TDD)
Ibm Tdd denom (see metering menu, § 2.5.2 for detail).
xx A
The default value is IAm, IBm or ICm value.
Icm Tdd denom If only one value is entered (for instance Iam Tdd denom =
xx A IAm), IAm will be the default value for “Ibm Tdd denom” and
“Icm Tdd denom”.
Setting Range: from 0.00% In to 200% In, step 1% In.
P12y/EN FT/E95 User Guide

Page 26/94 MiCOM P125/P126 & P127

Prot. Freq. Block Sets the voltage threshold below which frequency
U< 5V protection is blocked (1).
Setting range:
– from 5 to 130V, step 0.1 (voltage input range 57 to 130V,
P127xA),
– from 20 to 480V, step 0.1V (voltage input range 220 to
480V, P127xB).
dF/dt Cycles.nb. The dF/dt detection (rate of change of frequency) is defined
5 as a calculation of an average frequency variation of the
instantaneous values over a programmable number of
cycles.
This menu (1) adjusts the number of periods to calculate a
dF/dt detection.
(setting range from 1 to 200, step 1).
dF/dt Validat.nb= Sets the number of dF/dt detection to validate the dF/dt
4 fault (1).
(setting range from 1 to 12, step 1).
Inh.Block dF/dt If Yes is selected, the measurement of the frequency blocks the
>20 Hz/s No calculation when dF/dt exceeds ± 20Hz/s to avoid noise samples
(1)
in the calculation ,
No: dF/dt measurement is always used for the calculation.
Setting choice: Yes or No).

Time Synchro. Sets the time synchronization mode (2).

IRIG-B Setting choices:
– IRIG-B, Opto input, COMM1, COMM2: time is
synchronized with the selected signal.
– Automatic: the relay scans automatically IRIG-B, opto
inputs, comm1 then comm2 to select the synchronization
signal.
IRIG B Selects the modulated or unmodulated IRIG-B
synchronization signal (2).
MODULATED Setting choice: Modulated/Demodulated.
(1) P127 only.
(2) P127 with optional functions only.
2.3.2 Voltage Connections
For the P127, it is important to select the VTs configuration in the ‘Configuration / General
Options / VT Connection” submenu, according to the relay wiring for a correct functionality of
the voltage protections, or of the three phase and earth fault directional protections.
For the P127, there are three connection schemes for the VTs (see section P12y/EN CT).
2.3.2.1 Vpn (Three phase-neutral connection):
In this configuration, the relay directly measures Ua, Ub, and Uc and calculates internally the
zero sequence voltage Ue = (1/3)[Ua+Ub+Uc]. This internal value Ue will be used to be
compared to the threshold of Ue (the Earth Overvoltage Protection threshold and to evaluate
the angle with the earth current for the earth fault directional protection). However, the Ue is
displayed in the measurement Menu as well as the earth fault current and the relevant angle
between them as IN, IN^UN.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 27/94

2.3.2.2 2Vpn + Vr (Two phase-neutral plus an Open Delta connection):

In this configuration, the relay directly measures Ua and Ub. The input voltage of phase C of
the relay (terminals 73-74) which is connected to the summation of the three voltage phases
is used to be compared to the Ue (The earth Overvoltage Protection function threshold). This
voltage at C input is considered as Ur and it is displayed in the measurement menu as UN.
Moreover for the phase Overvoltage and Undervoltage protection functions, the phase C
voltage value Uc is internally reconstituted using the equation:
Uc = –(Ua+Ub). This value will be compared to the U/V or O/V threshold in case of a fault in
phase C. Uc is not displayed in the measurement menu.
The reconstruction is valid if the Ur is measured from a transformer with 5 limbs; two used
for the phase voltage Ua and Uc and the others used in Open delta configuration for the Ur.
BE CAREFUL: IF THE Ur IS MEASURED FROM A SEPARATE TRANSFORMER THE
ABOVE RECONSTRUCTION IS NOT VALID AND CAN NOT BE USED.
2.3.2.3 Vpp + Vr (Two phase-phase plus an Open Delta connection)
The relay directly measures Uab and Ubc, the phase to phase (A-C) voltage value Uca is
internally reconstituted using the equation Uca=–(Uab+Ubc).
The third input of voltage of the relay (terminals 73-74) can be connected to the output of a
delta transformer or to a dedicated voltage transformer, the measured value can be used to
compare to the earth overvoltage threshold.
This voltage is displayed in the measurement menu as UN and it is designed as the earth
voltage.

The shown measurements are functions of system voltages taken at the relay inputs.

2.3.3 Submenu Transfo. Ratio

CONFIGURATION

Transfo. Ratio Heading of Transfo. Ratio submenu.

Use     to scroll and set available selections. Press

 to confirm choice.
To gain access to the next window press . To gain
access to the previous window press .
Line CT primary Displays the rated primary current of the line CT, from 1 to
5A 9999 (1).

Line CT sec Displays the rated secondary current of the line CT (setting
5A value: 1or 5) (1).

E/Gnd CT primary Displays the rated primary current of the earth CT from 1 to
5A 9999.

E/Gnd CT sec Displays the rated secondary current of the earth CT

5A (setting value: 1 or 5).

Line VT primary Displays the rated primary voltage of the line VT (the rated
0.10 kV voltage input range is given by relay Cortec code) from 0.1
to 1000kV (step 0.01kV).
For the 10-480V model the setting range is from 10 to
480V, in steps of 1V (2).
Line VT sec Displays the rated secondary voltage of the line VT (Cortec
100.0 V code) from 2 to 130V (step 0.1V)
This window is not available for the 10-480V model (2).
P12y/EN FT/E95 User Guide

Page 28/94 MiCOM P125/P126 & P127

The two following lines are only displayed when the connection mode 2Vpp+Vr or 2Vpn+Vr
is selected.

E/Gnd VT primary Displays the rated primary voltage of the earth VT (Cortec
0.10 kV code) from 0.1 to 1000kV (step 0.01kV).
For the 10-480V model the setting range is from 10 to
480V, in steps of 1V (2).
E/Gnd VT sec Displays the rated secondary voltage of the earth VT
100.0 V (Cortec code): from 2 to 130V (step 0.1V).
This window is not available for the 10-480V model (2).
The following lines are only displayed when the “measurement CT” option is present.

Line CTm primary Displays the rated primary current of the measurement CT,
1°A from 1 to 9999 (2).
Setting range from 1 to 9999 A (step 1A)

Line CTm sec Displays the rated secondary current of the measurement
1°A CT (setting value: 1or 5) (2).
(1) P126 and P127 only.
(2) P127 only.

WARNING: WITH THE P127 RELAY, NOT ALL MEASUREMENTS CAN BE READ IN
THE DIRECT MODE. THESE MEASUREMENTS MUST BE READ IN THE
INDIRECT MODE.
These measurement values are called derived measurements. They depend on the selected
electrical voltage connection mode.
2.3.4 Submenus to Configure LEDs 5 to 8
To gain access to the CONFIGURATION menu from the default display press . Then
press  until the submenu Led is reached.

To reach the LED configuration submenu press  for Led 5. Press  to reach Led 6, again
to reach Led 7 and again to reach Led 8.
The following table lists the protection functions that can be assigned to the LEDs (5 to 8) for
each MiCOM relay model.
Directional (P127) or three phase (P126) overcurrent protection

TEXT P125 P126 P127 Information

I>, I>, I>>> X X Instantaneous 1 , 2 and 3rd phase overcurrent
st nd

thresholds
tI>, tI>>, tI>>> X X Time delayed 1st, 2nd and 3rd phase overcurrent
thresholds
tIA>, tIB>, tIC> X X Time delayed first threshold trip on phases A, B, C

Directional earth fault protection

TEXT P125 P126 P127 Information

Ie>, Ie>>, X X X Instantaneous 1 , 2 and 3rd earth thresholds
st nd

Ie>>>
tIe>, tIe>>, X X X Time delayed 1st, 2nd and 3rd earth threshold
tIe>>>
Ie>>>> X Instantaneous derived earth overcurrent threshold
tIe>>>> X Time delayed derived earth overcurrent threshold
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 29/94

Wattmetric Pe/IeCOS protection

TEXT P125 P126 P127 Information

Pe/IeCos> X X X Instantaneous 1 and 2nd earth overpower/IeCos
st

Pe/IeCos>> (wattmetric) thresholds

tPe/IeCos> X X X Time delayed 1st and 2nd earth overpower/IeCos
tPe/IeCos>> (wattmetric) threshold

Negative phase sequence overcurrent protection

TEXT P125 P126 P127 Information

I2>, I2>>, X X Instantaneous 1 , 2 and 3rd negative phase
st nd

I2>>> sequence overcurrent thresholds

tI2>, tI2>>, X X Time delayed 1st, 2nd and 3rd negative phase
tI2>>> sequence overcurrent thresholds

Thermal protection

TEXT P125 P126 P127 Information

Therm Trip X X Trip on Thermal overload

Three phase undercurrent protection

TEXT P125 P126 P127 Information

I< X X Instantaneous undercurrent threshold
tI< X X Time delayed undercurrent threshold

Overvoltage protection

TEXT P125 P126 P127 Information

U>, U>> X Instantaneous 1st and 2nd overvoltage threshold

tU>, tU>> X Time delayed 1st and 2nd overvoltage threshold

Undervoltage protection

TEXT P125 P126 P127 Information

Instantaneous 1 and 2nd undervoltage thresholds
st
U<, U<< X
tU<, tU<< X Time delayed 1st and 2nd undervoltage thresholds

Residual overvoltage protection

TEXT P125 P126 P127 Information

Ue>>>> X X X Instantaneous derived earth overvoltage threshold
tUe>>>> X X X Time delayed derived earth overvoltage threshold

Broken conductor protection

TEXT P125 P126 P127 Information

Brkn. Cond X X Broken conductor detection

CB Fail

TEXT P125 P126 P127 Information

CB Fail X X Detection of a Circuit Breaker failure (CB not open
at the end of tBF timer)
P12y/EN FT/E95 User Guide

Page 30/94 MiCOM P125/P126 & P127

Logic inputs

TEXT P125 P126 P127 Information

Input1 to X X X Copy of the status of logic inputs no 1, 2, 3 and 4
Input4 (“automat ctrl/inputs” menu)
Input5 to X X Copy of the status of logic inputs no 5, 6 and 7.
Input7
Input8 to X Copy of the status of logic inputs no 8, 9, 10, 11
InputC and 12 (option)

Autoreclose function

TEXT P125 P126 P127 Information

79 Run X X Signal that Autoreclose cycle is working
79i.Blocked X X Autoreclose lock activated by the internal process
of the autoreclose
79e.Blocked X X Autoreclose lock activated by the input “block 79”

Auxiliary timers

TEXT P125 P126 P127 Information

tAux1 to tAux4 X X X Copy of Aux1 to Aux 4 logic input delayed by Aux1
to Aux4 time (Aux1…Aux4 logic input and
aux1…aux4 time are set with “automat ctrl/inputs”
menu)
tAux5 to tAux7 X X Copy of Aux5 to Aux7 logic inputs delayed by Aux 5
to Aux7 times
tAux8 to tAuxC X Copy of Aux8 to tAuxC logic inputs delayed by Aux
8 to tAuxC times (option)

t SOTF FUNCTION

TEXT P125 P126 P127 Information

t SOTF X X Switch on to fault timer expired

Active overpower protection

TEXT P125 P126 P127 Information

P>, P>> X Instantaneous 1 and 2nd active overpower
st

thresholds
tP>, tP>> X Time delayed 1st and 2nd active overpower
thresholds

Active underpower protection

TEXT P125 P126 P127 Information

P<, P<< X Instantaneous 1 and 2nd active underpower
st

thresholds
tP<, tP<< X Time delayed 1st and 2nd active underpower
thresholds
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 31/94

Reactive overpower protection

TEXT P125 P126 P127 Information

Q>, Q>> X Instantaneous 1 and 2nd reactive overpower
st

thresholds
tQ>, tQ>> X Time delayed 1st and 2nd reactive overpower
thresholds

Reactive underpower protection

TEXT P125 P126 P127 Information

Q<, Q<< X Instantaneous 1 and 2nd reactive underpower
st

thresholds
tQ<, tQ<< X Time delayed 1st and 2nd reactive underpower
thresholds

Voltage / Current Supervision function

TEXT P125 P126 P127 Information

VTS X Voltage Transformer Supervision alarm, if enabled
(VT Supervision/VTS Alarm? = yes)
CTS X Current Transformer Supervision alarm

Frequency protection

TEXT P125 P126 P127 Information

F1 to F6 X Instantaneous 1st to 6th frequency thresholds
tF1 to tF6 X Time delayed 1st to 6th frequency thresholds
F Out X Frequency out of range signal

Rate of change of frequency

TEXT P125 P126 P127 Information

dF/dt1 to X Instantaneous 1 to 6th rates of change of frequency.
st

dF/dt6

Logic Equation

TEXT P125 P126 P127 Information

tEQU.A to X X X Results of equations A to H.
tEQU.H

MiCOM S1 Studio setting:

The LED 5 (6, 7 or 8) submenu contains up to 3 or 5 lines parameter settings. In the value
column, each line represents a setting value. State “1” means that the corresponding
parameter is associated to the LED.
The corresponding parameters are displayed in the setting panel: from 00 (last digit) up to
0D (first digit).
P12x Front panel setting:
Press  to access the LED 5 CONFIGURATION submenu, then  twice (press  to access
to others LEDs CONFIGURATION submenus).
Select “Yes” to assignate a LED to a function.

NOTES: Each parameter can be assigned to one or more LEDs.

One or more parameters (OR logic) can light each LED.
P12y/EN FT/E95 User Guide

Page 32/94 MiCOM P125/P126 & P127

CONFIGURATION

Led Heading Led submenu.

Activate (select choice “Yes” or inhibit (“No”) LED 5

operation when:
Led 5 Activate (select choice “Yes” or inhibit (“No”) LED 5
protection function No operation when:
- an alarm is exceeded,
- a threshold time delay has elapsed.
Refer to previous tables for protection functions list.
2.3.5 Submenu Logic Inputs Choice: Active High/Low
The inversion of the logic input in this menu inverts its allocated function status in the logic
inputs allocation (AUTOMAT CTRL/INPUTS menu). For example: if EL 2 logic input is 1,
then tAux1 = 0 when logic input is 1 and tAux1 = 1 when logic input is 0.

CONFIGURATION

Inputs Heading of configuration inputs submenu.

Inputs :7654321 P125 (4 inputs), P126 and P127 (7 inputs)

↑↓↓↓↑↑↑ This menu is used to assign active high or low functionality
to each logic input (1 to 7).
↑= active high, ↓= active low
Inputs :CBA98 P127 (optional 12 inputs configuration): as above for input 8
↑↓↓↓↑ to 12.

Voltage Input Set choice AC or DC power supply for the digital input. The
DC power supply for any input is the same one as much as the
power supply for the relay.

2.3.6 Submenu Output Relays

CONFIGURATION

Output Relays Heading of the CONFIGURATION RELAYS

MAINTENANCE submenu.

Fail Safe R. 87654321 P125 (6 relays), P126 and P127 (8 relays)

0000000 This menu allows the user to invert each of the output
relay contacts for the de-energised state.
1 = relay activated when driving signal is not active
0 = relay not activated when driving signal is not active
Maintenance Mode Choose if you want to activate the MAINTENANCE MODE
Yes of the relay. If the user selects Yes, output relays are
disconnected from the protection and automation
functions.
Relays CMD 8765W4321 P125 (6 relays + watchdog), P126 and P127 (8 relays +
000000001 Watchdog)
If the MAINTENANCE MODE is activated (set to Yes), this
menu allows the user to activate each one of the output
relay (from RL1 to RL8, W = Watchdog)
1 = relay activated
0 = relay not activated
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 33/94

2.3.7 Submenu Group Select

This submenu is used to select the active setting protection group, and to control the mode
of changing of group.
The changing of the group is blocked when an alarm is active, except if this alarm is
generated by a logic equation. If an order to change the group is generated when an alarm is
active, the group will change when the alarm is cleared because the changing group order is
recorded.
The setting group change is only executed when none protection function is running (except
thermal overload function).

CONFIGURATION

Group Select Heading of the Group Select submenu.

Change Group Selects the way to active the protection setting group.
INPUT When “Input” is selected, “change set” should be assigned
to a logical input in the ‘AUTOMAT. CTRL / Inputs’ menu.
When “Menu” is selected, the setting group is activated:
– locally by HMI, using “Setting Group” cell,
– remotely, using communications port.
Setting choice: Input or menu
Setting Group Displayed only when “Change group” = Menu.
1 This cell is used either to activate locally a specific setting
group or to define which value should be used when remote
group switch command is received.
A local setting change command can be perfomed by
changing this value manually among [1 ; 2] for P125/P126
and among [1; 2 ; 3 ; 4 ; 5 ; 6 ; 7 ; 8] for P127.
On P127, when remote group switch command is received,
settings group will switch form ‘setting Group’ to ‘Target
group’ and vice-versa. On P125/P126, ‘Target group’
doesn’t exist as remote group switch command will switch
from 1 to 2 or 2 to 1 by default.
NOTE:
- Group will be actived only if no alarm is active
- Active setting group is available in ‘OP PARAMETERS /
Active group’ cell.
Target group Available on P127 only with setting choices from 0 to 8.
2 ‘Target group’ defines the destination setting group. When
remote group switch command is received, settings group
will switch form ‘setting Group’ to ‘Target group’ and vice-
versa.
NOTE:
If “0” is selected and remote group switch command is
sned, the setting group will be switched from ‘Active group’
to 1. Next commands will switch settings group from 1 to 2
and vice-versa.
P12y/EN FT/E95 User Guide

Page 34/94 MiCOM P125/P126 & P127

Group if low P127 only; displayed when “Change group” = Input.

level G1 “Group if low level” defines which setting group should be
activated when no voltage is received on the digital input
(according ‘AUTOMAT. CTRL / Inputs’ menu).
“Group if high level” defines which setting group should be
Group if high activated when polarization voltage is received on the digital
level G2 input (according ‘AUTOMAT. CTRL / Inputs’ menu).
Group Copy ? P127 only.
No Yes: Copy the “copied from” selected group settings to
“copied to” selected group.
copy from P127 only.
G1 “Copy from” and “copy to” cells select the copy
configuration.
Setting are unchanged when a setting group is copied to
itself.
copy to
A copy to an active group will overwrite the active setting.
G1
Setting choices: G1 to G8.
The “Execution ?” cell will be displayed after “copy to” cell
change: select Yes to apply the copy.

2.3.8 Submenu Alarms

CONFIGURATION

Alarms Heading of Alarms submenu.

Inst. Self-reset Enable/disable auto-acknowledgment mecanism of any

Yes instantaneous alarms/LEDs.

Reset Led on If selected, Reset Led on Fault will insure that only the
Fault Yes latest active alarms/LEDs are present (other will be
removed).
INH Alarm function ? Yes: the function will not raise an alarm. Alarm LED stays
No OFF no message will be displayed on the HMI.
No: the function will raise an alarm.
The default value is No (except “Inh Alarm Ctrl Trip”=Yes).
In the inh Alarm sub-menus, when the event is noted as a
time delayed threshold, the alarm is inhibited by the time
delayed threshold and the corresponding instantaneous
threshold (for instance, if “Inh Alarm tU<”= yes, U< and tU<
will not raise an alarm. Note, If one of this function is set to
Yes, the alarm will be inhibited if this one is NOT affected to
RL1.
Refer to the following table for trip list.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 35/94

Event Label description P125 P126 P127

Ctrl_Trip ? Control trip function assigned to the input. The X X X
default value value is Yes. The next table
summarises the behaviour of control trip function
when a control trip order is received by the relay.
tI< ? Instantaneous and time delayed undercurrent X X
threshold.
tU < ? Instantaneous and time delayed undervoltage X X
threshold.
tP< ? / tP<< ? Instantaneous and time delayed first / second active X
underpower thresholds.
tQ< ? / tQ<< ? Instantaneous and time delayed first / second X
reactive underpower thresholds.
F1 ? to F6 ? Instantaneous 1st to 6th frequency threshold. X
[79] ext blk ? Autoreclose locked by digital input. X X
taux1? to tAux4? Aux1 (to Aux 4) delayed by tAux1 (to tAux 4) time. X X
taux5? to tAux7? Aux5 (to Aux 7) delayed by tAux5 (to tAux 7) time. X X
taux8? to tAuxC? As above for tAux8 to tAuxC (optional configuration). X
Eq A to Eq H Logical output of boolean equation A to equation H. X X X

Case
RL1 assigned to “Ctrl Trip” No No Yes Yes
“Ctrl trip” alarm inhibited No Yes No Yes
Result:
LED trip Off Off On Off
LED Alarm blinking Off blinking Off
Alarm message on display Yes No Yes No
Event “EVT_TC_TRIP_X1” generated in the event file Yes Yes Yes Yes
Default recorded in the records/faul record menu No No Yes Yes
RL1 activated No No Yes Yes

2.3.9 Submenu Date

CONFIGURATION

Date Heading type date submenu.

Date Format Assigns free format date or IEC format date (This operation
is seen from remote).
PRIVATE
Select choice: Private or IEC
P12y/EN FT/E95 User Guide

Page 36/94 MiCOM P125/P126 & P127

2.4 MEASUREMENTS menu

By going to the MEASUREMENTS menu various system measurement values can be
shown on the LCD.
The displayed voltage measures depend on which wiring scheme is choose.
The direct measure is the signal wires to the terminal.
The derived measure is the calculated.
The RMS value is provided for the direct measures.
The fundamental value is provided for the derived (calculated) measures.

To gain access to the MEASUREMENTS menu from the default display, press  then 
until the header of menu is reached.
The following table lists the items available in the measurements menu for the P125, P126 &
P127 relays.

DISPLAY UNIT INFORMATION

MEASUREMENTS Heading Measurements menu
Frequency Hz Displays the network frequency taken from analogue inputs
50.00 Hz having a reliable signal level. In case of non reliable analogue
signal input level present the display shows XX.XX Hz.
I A (or I L1, or I R) A Displays the A (or B, C or N) phase current (true RMS value)
I B (or I L2, or I S) taking into account the phase CT ratio
I C (or I L3, or I T) (CONFIGURATION/Transfo. Ratio submenu) (1).
IN (or I o, or I E) The displayed label depends on the “Configuration /
Phase/Earth Text” setting.
Ie>>>> A Displays the derived earth overcurrent threshold (1).
I1 A Displays the positive (I1) or negative (I2) sequence
I2 component (1).
RATIO I2/I1 % Displays the ratio of I2/I1. This derived measurement is used
by the Broken Conductor detection function. (Automat. Ctrl
menu) (1).
UA V When a 3Vpn (three phases – neutral) or 2Vpn+Vr (two phase-
UB neutral + open delta connection) connection mode is choosen,
UC displays the RMS voltage value of phase A, or B or C (2).
UAB V When a 2Vpp+Vr (two phase-phase + open delta connection)
UBC connection mode is choosen, displays the calculated
UCA fondamental value of the line voltage UAB, or UBC, or UCA
(vector calculus) (2).
UN V Displays the earth voltage taking in account the earth VT
connection mode and ratio (General Options and Transfo.
Ratio submenu).
Pe W Displays the neutral power based on neutral current value,
neutral voltage and the relevant angle.
IeCos A Displays the active neutral current value.
IN ^ UN Angle ° Displays the angle value between the Zero sequence voltage
and earth fault current relevant.
IA ^ IB Angle ° Displays the angle value between phase IA and IB, or between
IA ^ IC Angle IA and IC (1).
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 37/94

DISPLAY UNIT INFORMATION

IA ^ VA Angle ° When a 3Vpn (three phases – neutral) or 2Vpn+Vr (two phase-
IA ^ VB Angle neutral + open delta connection) connection mode is choosen,
IA ^ VC Angle displays the angle value between phase IA and voltage VA, or
between phase IA and voltage VB, or between phase IA and
voltage VC.
Va

Ia

Ic

Vc Vb
Ib P03978ENa

IA ^ VAB Angle ° When a 2Vpp+Vr (two phase-phase + open delta connection)

IA ^ VBC Angle connection mode is choosen, displays the angle value between
IN ^ UN Angle phase IA and voltage VAB, or between phase IA and voltage
VBC, or between the Zero sequence voltage and earth fault
current.relevant.
UAB
IAm

UBC
ICm IBm

P03978ENa
UCA

P W Displays the positive & negative active power.

The maximum measured value displayed is 9999MW. If the
measured value is above 9999MW this display remains on the
LCD.
Q VAR As above for the positive & negative reactive power (see
P12y/EN AP).
Maximum measured value displayed is 9999MVAr. If the
measured value is above, this display remains on the LCD.
S VA As above for the total apparent power (product of the per-
element Volts and Amps).
The maximum measured value displayed is 9999MVA. If the
measured value is above, this display remains on the LCD.
Cos (Phi) ° Displays the three phases power factor (cosine of the angle
between the fundamental voltage vector and the fundamental
current vector, see the following diagram).
Energy Header for energy measurements.
RST=[C] Allows the user to reset the measured energy value. To clear
these values, press .
Note: Password is requested to clear the display.
3Ph WHours Fwd Wh Displays the three phase active positive energy (forward). If the
measured energy value is higher than 4200GWh then the
display shows XXXX GWh.
3Ph WHours Rev Wh Displays the three phase active negative energy (reverse). If
the measured energy value is higher than 4200GWh then the
display shows XXXX GWh.
3Ph VArHours Fwd Varh Displays the three phase reactive energy forward. If the
measured energy value is higher than 4200GVarh then the
display shows XXXX Gvarh.
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Page 38/94 MiCOM P125/P126 & P127

DISPLAY UNIT INFORMATION

3Ph VArHours Rev Varh Displays the three phase reactive energy reverse. If the
measured energy value is higher than 4200GVarh then the
display shows XXXX Gvarh.
3Ph VAHours Vah Displays the three phase apparent energy. If the measured
energy value is higher than 4200 GVah then the display shows
XXXX Gvah.
I N – fn A Displays the earth current I N (true RMS value) minus the earth
RST=[C] current value at the fundamental frequency (value of the
harmonic).
To clear the value, press .
THERMAL STATUS % Displays the % thermal state based on true RMS current phase
RST = [C] values.
To clear the % value, press  (1).
MAX & AVERAGE Allows the user to clear the maximum (peak) and average
RST = [C] (rolling) memorised values of the current.
To clear these values, press  (1).
Max IA Rms A Displays the true RMS maximum current value for phase A,
Max IB Rms phase B or phase C (1).
Max IC Rms
Average IA Rms A Displays the true RMS average current value for phase A,
Average IB Rms phase B or phase C (1).
Average IC Rms
Max UAB Rms V Displays the true RMS maximum line voltage value for UAB or
Max UBC Rms UBC (2).
Average UAB Rms V Displays the true RMS average line voltage value for UAB or
Average UBC Rms UBC (2).
MAX SUBPERIOD Allows the user to clear the maximum subperiod values of the
RST = [C] 3 currents for each phase.
To clear the values, press  (1).
MAX SUBPERIOD A Display the IA, IB or IC peak value demand. The value is the
IA Rms true RMS maximum value on a subperiod (1).
IB Rms
IC Rms
ROLLING AVERAGE Allows the user to clear the rolling average values of the 3
RST = [C] currents.
To clear the values, press  (1).
ROLLING AVERAGE A Display the IA, IB or IC average value demand. The value is
IA Rms the true RMS average value on a number of subperiod set in
IB Rms Record menu (1).
IC Rms
Reclose Stats Allows the user to clear the statistics stored for the autoreclose
RST = [C] function.
To clear the values, press  (1).
Total recloses Displays the total number of re-closings (1).
Cycle1 Recloses Displays the total number of re-closings for cycle 1, cycle 2,
Cycle2 Recloses cycle 3 or cycle 4 (1).
Cycle3 Recloses
Cycle4 Recloses
Total Trip & Displays the total number of definitive trips issued by the
Lockout autoreclose function (1).
(1) P126 and P127 only.
(2) P127 only.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 39/94

2.5 METERING Menu (P127)

The “METERING” menu is only displayed when measurement current transformers are
connected (optional configuration with product codes P127xx4, P127xx5, P127xx6 and
P127xx7).
This menu is used to display:

− frequency,

− measured currents, total harmonics distortion (THD) and total demand distortion
(TDD), K Factor, measured harmonics,

− voltages, total harmonics distortion (THD), harmonics,

− active / reactive / apparent powers,

− positive / negative energies (active / reactive).

To activate this menu, activate at least one “CTm1 phase ?” or CTm2 phase ?” in the
‘CONFIGURATION / General options’ menu (a measurement CT must be connected). The
“metering” menu displays currents and voltages according to the table presented in the
P12y/EN AP section.
To access METERING menu from the default display, press  then  until the header of
menu is reached. The submenus of the Metering are:

METERING


   
Frequency Currents Voltages Powers Energies
   
 

 Phase A   Phase A 
   

Phase C Phase B Phase C Phase B

 

 
P0792ENa

The following table lists the items available in the Metering menu for the P127 relay:
2.5.1 Submenu “Frequency”

DISPLAY UNIT INFORMATION

Submenu FREQUENCY
Frequency Hz Displays the network frequency.
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2.5.2 Submenu “Currents”

DISPLAY UNIT INFORMATION

Submenu CURRENTS
Phase A Phase B Phase C Use  or  keys to select phase B or phase C.
IAm IBm ICm A Displays the magnitude of the measured current (true
RMS value), taking in account the Quadrant convention
and CTM ratio (‘CONFIGURATION / General options’
and ‘Transfo ratio’).
THDAm THDBm THDCm % Displays the percentage of the Total Harmonic Distortion
(THD) measured for the current (irregular harmonics).
For phase A:

THDAm = 100% ×
IAmh2² + IAmh3² + IAmh4² + …
I1
with I1 = magnitude of fundamental current.
TDDAm TDDBm TDDCm % Displays the percentage of the Total Demand Distortion
(TDD) measured for the current. For phase A:

TDDAm = 100% ×
IAmh2² + IAmh3² + IAmh4² + …
IL
with IL = magnitude of the load of the system (set this
value using ‘CONFIGURATION / General options / IAm
TDD denom.’ menu.
Iam^Ibm Iam^Icm ° Displays the angle value between phase IAm and IBm,
or between phase IAm and ICm (Phase B only).
Ia

Ic P03978ENa
Ib

KAm KBm KCm Displays the K factor. K factor is a measure of the

heating effects on transformers. For phase A:
10

∑ IAmhi² × i²
KAM = 100 × i=1
10

∑ IAmhi²
i =1

with i = harmonic number.

IAmh2 IBmh2 ICmh2 % Displays the magnitude of the 2nd to 10th harmonics of the
to to to fundamental current.
IAmh10 IBmh10 ICmh10
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MiCOM P125/P126 & P127 Page 41/94

2.5.3 Submenu “Voltages”

The voltage metering depends on the VT connection and VT Protection settings
(‘Configuration / General options’ menu). For more information about connection modes,
refer to § 2.3.2. The voltage calculation mode, according to the connection, is given in the
section P12y/EN AP.
2.5.3.1 Connection mode = 3Vpn AND “Protect P-N”, or 2Vpn+Vr AND “Protect P-N”

DISPLAY UNIT INFORMATION

Submenu VOLTAGES:
Phase A Phase B Phase C Use  or  keys to select phase B or phase C.
VAm VBm VCm V Displays the magnitude of the VA, VB or VC voltage
(true RMS value), taking in account the CTm ratio
(‘CONFIGURATION / General options / Transfo ratio’).
THDAm THDBm THDCm % Displays the percentage of the Total Harmonic
Distortion (THD) measured for the voltages (irregular
harmonics). For phase A:

THDAm = 100% ×
VAm2² + VAm3² + VAm4² + …
V1
with V1 = magnitude of fundamental Voltage.
Iam ^ Va Iam ^ Vb Iam ^ Vc ° Displays the angle value between phase IA and voltage
VA, VB or VC.
Va

Ia

Ic

Vc Vb
Ib P03978ENa

Ibm ^ Vb Icm ^ Vc ° Displays the angle value between phase IB and voltage
VB, or between phase IC and voltage VC.
Va

Iam

Icm

Vc Vb
Ibm P03978ENa

VAmh2 % Displays the magnitude of the 2nd to 10th harmonics of

to the fundamental voltage.
VAmh10
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2.5.3.2 Connection mode = 3Vpp+Vr or “Protect P-P”

DISPLAY UNIT INFORMATION

Submenu VOLTAGES:
Phase A Phase B Phase C Use  or  keys to select phase B or phase C.
UABm UBCm UCAm V Displays the calculated value of the line voltage UAB.
(vector calculus), taking in account the CTm ratio
(‘CONFIGURATION / General options / Transfo ratio’).
THDAm THDBm THDCm % Displays the percentage of the Total Harmonic
Distortion (THD) measured for the voltages (irregular
harmonics). See § 2.5.3.1.
Iam^Uab Iam^Ubc Iam^Uca ° Displays the angle value between phase IA and
voltage UAB, UBC or UCA.
UAB
IAm

UBC
ICm IBm

P03978ENa
UCA

Icm^Uab Ibm^Ubc Ibm^Uca ° Displays the angle value between phase IC and
voltage UAB, or between phase IB and voltage UBC
or UCA, or between phase IC and voltage UCA.
UAB
Iam

UBC
Icm Ibm

P03978ENa
UCA

VABmh2 VBCmh2 VCAmh2 % Displays the magnitude of the 2nd to 10th harmonics of
to to to the fundamental voltage.
VABmh10 VBCmh10 VCAmh10

2.5.4 Submenu Powers

DISPLAY UNIT INFORMATION

Submenu POWERS
Pm W Displays the measured positive & negative active power.
Qm VAR Displays the measured positive & negative reactive power.
Sm VA Displays the measured total apparent power (product of the per-
element Volts and Amps).
DPF ° Displays the three Displacement Phase Power (DPF) factor
(cosine of the angle between the fundamental voltage vector
and the fundamental current vector).

See § 2.5.6 to see the convention for the positive (+) or negative (–) sign.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 43/94

2.5.5 Submenu Energies

DISPLAY UNIT INFORMATION

Submenu ENERGIES
RST = [C] Allows the user to clear the measured energy values (export
power, import power, lagging and Leading VARs).
To clear these values, press .
Note: Password is requested to clear the values.
Date Displays the date of the beginning of the energies calculation
(date of the last reset).
(10/11/09 = November 10th 2009).
Time Displays the hour of the beginning of the energies calculation
(hour of the last reset).
(13:57:44 = 1:57:44 pm).
Export Power Wh Displays the three phase active energy (forward) measured
since the previously displayed date and time.
Import Power Wh Displays the three phase active energy (reverse) measured
since the previously displayed date and time.
Lagging VARs Varh Displays the three phase reactive energy (forward) measured
since the previously displayed date and time.
Leading VARs Varh Displays the three phase reactive energy (reverse) measured
since the previously displayed date and time.

See § 2.5.6 to see the convention for the positive (+) or negative (–) sign.
P12y/EN FT/E95 User Guide

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2.5.6 Plus and minus signes for power and energy calculation.
Plus or minus signs are defined as follows:

Reference direction

SOURCE LOAD

Metering point

ACTIVE POWER: P is positive when the power is from the source to the load
REACTIVE POWER: Q is positive when the load is inductive.

Im (+)

Quadrant 2 Quadrant 1

V
Re (–) Re (+)

Quadrant 3 Quadrant 4

Im (–)
P3976ENa

with:

Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4

Power
Active (P) + – – +
Reactive (Q) – – + +
Energy
Export Wh (Ea+) + – – +
Import Wh(Ea–) – + + –
Lagging VARh (Er+) – – + +
Leading VARh (Er–) + + – –

NOTE: Quadrant 1 is the default setting. See ‘CONFIGURATION / General

options / Quadrant conv.’ menu to configure the active / reactive
power quadrant.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 45/94

2.6 COMMUNICATION menu

The COMMUNICATION menu depends:on the type of communications protocol: ModBus,
IEC 60870-5-103 or DNP3.0 and on the connection type (P127 optional configuration).
To gain access to the COMMUNICATION menu from the default display, press  then 
until the menu is reached.

COMMUNICATION Heading of COMMUNICATION menu.

HMI ? Select Yes in order to use the front panel communication

No port.
Setting choice: Yes or No
COMM1 ? Select Yes in order to use the first communication port.
No Setting choice: Yes or No

COMM2 ? P127 optional configuration only.

No Select Yes in order to use the second communication
port.
Setting choice: Yes or No

WARNING: A MODBUS NETWORK CAN ONLY COMPRISE 31 RELAY ADDRESSES

+ 1 RELAY MASTER ON THE SAME MODBUS SUB-LAN.
2.6.1 HMI submenu
The following menu is displayed when “HMI” = Yes is selected.

HMI ?
Yes

Relay Address Indicates the front port communication address (MODBUS

Modbus 1 has native protocol).

Date format Choose the format of the date, either PRIVATE or IEC
Private protocol.
Select from: Private or IEC.

2.6.2 COMM1 and COMM2 submenus

The following menu is displayed when “COMM1” or “COMM2” = Yes is selected. The first
part of the following presentation is identical for the two communivation options.

COMM1 (or 2) ?
Yes

Baud Rate This cell controls the communication speed between relay
19200 bd and master station.
It is important that both relay and master station are set at
the same speed setting.
Select from: 300, 600, 1200, 2400, 4800, 9600, 19200 or
38400 bd.
Parity Choose the parity in the ModBus data frame.
None Select parity: Even, Odd or None

Stop Bits Choose the number of stop bits in the DNP3.0 frame. Select
1 0 or 1 using . Press  to validate your choice.

Relay Address This cell sets the unique address for the relay such that only
1 one relay is accessed by master station software.
Select from 1 to 255.
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2.6.3 IEC60870-5-103 protocol additional cells

The following menu is specific to IEC60870-5-103 protocol.

Spont. event. &GI Selection of spontaneous events and General Interrogation

A11 None (events during a period) format.
The events created by the relay have two formats (see
P12y/EN CT chapter):
- public range, using IEC protocol,
- private range, using private number format.
This command activates or deactivates private and public
format transmission of the events to the master station.
Select choice: None / Private only / IEC only / all
GI select. Selection of the General Interrogation data transmission:
the list of basic (spontaneous messages) and advanced
Basic data sent to the master station during general interrogation
is detailed in section P12y/EN CT, IEC 60870-5-103 part,
§ 1.3.
Setting choice: Basic / Advanced
Measur. upload Activates or deactivates the ASDU 3.4 measures
ASDU 3.4 Yes transmission filtering mode. This option allows
communication to the master station of earth current and
earth voltage measures (IN and VN).
Setting choice: Yes or No
Measur. upload Activates or deactivates the ASDU 9 measures tansmission
ASDU 9 Yes filtering mode. This option allows communication to the
master station of:
- phase current measures (IA, IB and IC),
- phase voltage measures (VA, VB and VC),
- frequency measures,
- active and reactive power measures.
Setting choice: Yes or No
Measur. upload Selects the measures transfert mode. This option allows
Other Yes communication of all measures.
Setting choice: Yes or No
Events + Measur. Allows or blocks events and measurement communication.
Blocking Yes Setting choice: Yes or No

Command Allows or blocks remote commands.

Blocking Yes Setting choice: Yes or No

Command duration COMM1 only

0.1s In order to avoid a transmission conflict between the two
RS485 ports (optional configuration), transmission using the
second port can be time-delayed. Transmission and
reception with comm2 will start after the end of the
“Command duration”.
Setting range: from 0.1 to 30s, step 0.1s
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 47/94

2.7 PROTECTION menu

The protection menus are designated as PROTECTION G1 and PROTECTION G2 menu
(available for the MiCOM P125 and P126) and PROTECTION G1 to PROTECTION G8
menu available for the MiCOM P127 relay. By opening the PROTECTION menu the user
can program the parameters of various protection functions and settings (thresholds, time
delay, logic) associated with each of the phase or earth protection functions.

The various submenus are:

 PROTECTION   
G1 / G2 …G8
       
 [67/50/51] (1)  [67N]E/  [32] Phase (2)  [32N] Earth (1)

Phase OC  Gnd  power  Wattmetric

 [46] Neg (1)  [49] Therm (1)  [37] Under (1)  [59] Phase (2)
Seq OC  OL  current  Over Voltage

 [27] phase (2)  [59N] residual(1)  [79] (1)  [81] (2)

under voltage  over voltage  Autoreclose  Frequency

 [81R] Freq. (2)   

rate of change
(1) P126 and P127 only
(2) P127 only
2.7.1 Submenu [67/50/51] PHASE OC (P126 and P127 only)
The MiCOM P126 and P127 allow the following protections:

− P126 : [50/51], three phase overcurrent,

− P127 [67/50/51], directional three phase overcurrent.

PROTECTION G1

[67/50/51] Phase OC Heading of [67/50/51] phase overcurrent submenu (“[50/51]

PHASE OVERCURRENT”).

I> ? Setting choice: No, Yes, DIR.

No - Yes, the first phase overcurrent threshold (I>) protection is
enabled. The first phase overcurrent threshold protection
submenu (see § 2.7.1.1) is displayed,
- DIR: the relay operates like a three-phase directional
overcurrent protection and the directional choice window
(see § 2.7.1.1) is shown (P127 only),
- No, the first phase overcurrent threshold (I>) protection is
not enabled, and the next menu is the “I>> ?” menu.
I>> ? Selection of the second phase overcurrent threshold (I>>)
Yes protection. Setting choice: No, Yes, DIR,
- Yes, the second phase overcurrent threshold (I>>)
protection submenu is displayed (see § 2.7.1.2),
- DIR, the relay operates like a three-phase directional
overcurrent protection and the directional choice window is
shown (P127 only),
- No, the next window will show the “I>>> ?” menu.
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I>>> ? Selection of the third phase overcurrent threshold (I>>>)

Yes protection. Setting choice: No, Yes, PEAK, DIR.
- Yes: the third overcurrent threshold submenu is shown
(see § 2.7.1.3) and I>>> threshold operates on Discrete
Fourier transformation base,
- DIR: the relay operates like a three-phase directional
overcurrent protection, the directional windows are shown
and I>>> threshold operates on Discrete Fourier
transformation base (see § 2.7.1.3),
- PEAK: The third threshold can be set to operate on the
peak of the measured phase current. It compares the
biggest peak value of the measured current against the
setting (see § 2.7.1.3),
- No, next window will show the submenu [67] Phase OC.

2.7.1.1 Submenu First phase overcurrent threshold (I>) protection

I> ? “No”, “Yes” or “DIR” option is selected.

Yes The first phase overcurrent threshold (I>) protection is
enabled.
If “DIR” is selected, “I> Torque” and “I> Trip zone”
submenus are displayed.
I> Sets the value for the overcurrent threshold I>. The
10.00 In threshold setting range is from 0.1 to 25In (step 0.01In).

I> If “I> ?” = “DIR” only (P127 only).

Torque 90 ° Displays setting value for the angle between voltage and
current (see P12y/EN AP section) from 0° to 359° (step
1°).
I> If “I> ?” = “DIR” only (P127 only).
Trip Zone ±10 ° Displays angle value for the Trip Zone. This defines the
operating region to either side of the torque angle from
±10° to ±170°, in steps of 1°.
Delay Type Selects the time delay type associated with I>.
DMT Setting choices are:
- “DMT” (definite minimum time): see a,
- “RI” (electromechanical inverse time curve): section b,
- IEC-xxx, CO2, CO8, IEEE-XX inverse time delay curve,
see section c,
- RECT curve, see section c.

a) Delay type = Definite Minimum Time

Delay Type “DMT” is selected.

DMT

tI > Sets the time delay associated with I>. The setting range
150.00 s is from 0.040 to 150.0s (step 10ms).
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 49/94

b) Delay type = RI - electromechanical inverse time curve

Delay Type Display of the I> inverse time delay (electromechanical

RI RI curve).

K Selects the RI curve K value from 0.100 to 10 (step

2.500 0.005).

t Reset Sets the reset time value from 0 to 100 s (step 10 ms).
60 ms

I> >> >>> Interlock of first threshold by the second and third
Interlock Yes thresholds, but only if first threshold trip is set to IDMT.
Setting choice: No, Yes

c) Delay type = IEC-xxx, RECT, COx or IEEE/ANSI

Delay Type Display threshold delay type.

IEC-STI

TMS Sets Time Multiplier Setting (TMS) value for the curve
1.000 from 0.025 to 1.5 (step 0,001).

Reset Delay Type if “Delay type” = IEEE/ANSI or COx curve is selected

DMT only.
Selects the reset delay time type. Select between DMT
(Definitive Time) and IDMT (Inverse Time).
Rtms If “Reset Delay Type” = IDMT is selected.
0.025 Sets the Reverse Time Multiplier Setting (RTMS) value
associated with the IDMT reset time choice from 0.025 to
3.200 (step 0.001).
t Reset If “Reset Delay Type” is not “IDMT”.
0.10 s Sets the reset time value from 0 to 100 s (step 10 ms).

I> >> >>> Interlock of first threshold by the second and third
Interlock Yes thresholds, but only if first threshold trip is set to IDMT.
Setting choice: No, Yes

2.7.1.2 Submenu second overcurrent threshold I>> protection

This section presents the main specific points for this submenu (I>> = Yes). Refer to §
2.7.1.1 for details (setting ranges, setting choices and availabilities).

I>> ? “Yes” or “DIR” option is selected.

Yes The second phase overcurrent threshold (I>) protection is
enabled.
If “DIR” is selected, “I> Torque” and “I> Trip zone”
submenus are displayed.
I>> Sets the value for the overcurrent threshold.
10.00 In The threshold setting range is from 0.1 to 40 In (step 0.01)
In.
I>> If “I>> ?” = “DIR” only.
Torque 90 ° Displays setting value for the torque angle between voltage
and current (see P12y/EN AP section) from 0° to 359° (step
1°).
I>> If “I>> ?” = “DIR” only.
Trip Zone ±10 ° Displays angle value for the Trip Zone. This defines the
Trip operating region to either side of the torque angle. Setting
Trip +/- range is from ±10° to ±170°, in steps of 1°.
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Delay Type Selects the time delay type associated with I>.
DMT Setting choices are:
- “DMT” (definite minimum time): see a,
- “RI” (electromechanical inverse time curve): section b,- -
IEC-xxx, CO2, CO8, IEEE-XX inverse time delay curve, see
c,
- RECT curve, see section c..

a) Delay type = Definite Minimum Time

Identical to § 2.7.1.1, section a).
b) Delay type = RI - electromechanical inverse time curve
Identical to § 2.7.1.1, section b), excluding the “I> >> >>> Interlock” submenu.
c) Delay type = IEC-xxx, RECT, Cox or IEEE/ANSI
Identical to § 2.7.1.1, section b), excluding the “I> >> >>> Interlock” submenu.
2.7.1.3 Submenu Third phase overcurrent threshold (I>>>) protection

I>>> ? “Yes” or “No” or “DIR” or “PEAK” option is selected.

Yes The third phase overcurrent threshold (I>>>) protection is
enabled.
If “DIR” is selected, “I>>> Torque” and “I>>> Trip zone”
submenus are displayed.
I>>> Displays setting value for the third overcurrent threshold
10.00 In I>>> from 0.1 to 40In (step 0.01In).

I>>> If “>>> ?” = “DIR” only.

Torque 90 ° Displays setting value for the torque angle between
current and voltage (see P12y/EN AP section), from 0° to
359° (step 1°).
I>>> If “>>> ?” = “DIR” only.
Trip Zone ±10 ° Displays angle value for the Trip Zone.
This defines the operating region to either side of the
torque angle, from ±10° to 170° (step 1°).
tI>>> Sets the time delay associated with I>>>. The setting
150.00 s range is from 0 to 150 s (step 10ms).

2.7.2 Submenu [67N] E/GND

PROTECTION Heading of Protection menu.

[67N] E/GND Heading of the earth overcurrent protection submenu.

Ie> ? Setting choice: DIR, Yes or No

No - Yes: the first earth overcurrent threshold (Ie>) protection is
enabled. The first earth overcurrent threshold submenu
(see § 2.7.2.1) is displayed.
- DIR: the relay operates like a three-phase directional
overcurrent protection and the directional choice window
(see § 2.7.2.1) is shown.
- No: the first earth overcurrent threshold (Ie>) protection is
not enabled, and the next menu is the “Ie>> ?” menu.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 51/94

Ie>> ? Setting choice: DIR, Yes or No

No - Yes: the second earth overcurrent threshold (Ie>>)
protection is enabled. The second earth overcurrent
threshold submenu (see § 2.7.2.2) is displayed.
- DIR: the relay operates like a three-phase directional
overcurrent protection and the directional choice window
(see § 2.7.2.2) is displayed.
- No: the second earth overcurrent threshold (Ie>>) is not
enabled, and the next menu is the “Ie>>> ?” menu.
Ie>>> ? Setting choice Yes, No, DIR and Peak
No - Yes: the third earth overcurrent threshold (Ie>>>)
protection is enabled. The third earth overcurrent threshold
submenu protection (see § 2.7.2.3) is displayed.
- DIR: the relay operates like a three-phase directional
overcurrent protection and the directional choice window
(see § 2.7.2.3) is shown.
- PEAK: The third threshold can be set to operate on the
peak of the measured phase current. It compares the
biggest peak value of the measured current against the
setting (see § 2.7.2.3).
- No: the third earth fault threshold (Ie>>>) is not enabled.
Ie >>>>? P127 only.
No Setting choice Yes, No or DIR
Yes: the derived earth overcurrent threshold (see § 2.7.2.4)
is enabled.
No: the derived earth overcurrent threshold is disabled.

2.7.2.1 Submenu First earth overcurrent threshold (Ie>) protection

Ie> ? “Yes” or “DIR” option is selected.

Yes The first earth overcurrent threshold (I>) protection is
enabled.
If “DIR” is selected, “Ue>”, “Ie> Torque” and “Ie> Trip
zone” submenus are displayed.
Ie> Sets the value for the earth overcurrent threshold Ie>.
1.000 Ien The threshold setting range is from 0.002 to 1.000Ien
(step 0.001Ien).
Ue> If “Ie> ?” = “DIR” only.
5.0V Displays setting value for the earth overvoltage threshold
associated to Ie> (see P12y/EN AP section).
Input voltage range 2–130V: The threshold setting range
is from 1 to 260V, in steps of 0.1V.
Input voltage range 10–480V: The threshold setting
range is from 4 to 960V, in steps of 0.5V.
Ie> If “Ie> ?” = “DIR” only.
Torque 0° Displays setting value for the torque angle between
voltage and current (see P12y/EN AP section), from 0°
to 359° (step 1°).
Ie> If “Ie> ?” = “DIR” only.
Trip Zone ±10 ° Displays angle value for the Trip Zone. This defines the
operating region to either side of the torque angle from
±10° to ±170°, in steps of 1°.
Delay Type Selects the time delay type associated with I>.
DMT Setting choices are:
- “DMT” (definite minimum time): see section a,
- “RI” (electromechanical inverse time curve): section b,-
- IEC-xxx, CO2, CO8, IEEE-XX inverse time delay curve,
see section c,
- RECT curve, see section c..
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a) Delay type = Definite Minimum Time

Delay Type “DMT” is selected.

DMT

tIe > Sets the time delay associated with Ie>. The setting
150.00 s range is from 0.040 to 150.0s (step 10ms).

tReset Sets the reset time value from 0 to 100s (step 10ms).
150.0 s

b) Delay type = RI - electromechanical inverse time curve

Delay Type Display of the I> inverse time delay (electromechanical

RI RI curve).

K Selects the RI curve K value from 0.100 to 10 (step

1.000 0.005).

t Reset Sets the reset time value from 0 to 100s (step 10ms).
0.10 s

Ie> >> >>> Interlock of first threshold by the second and third
Interlock Yes thresholds, but only if first threshold trip is set to IDMT.
Setting choice: No, Yes

c) Delay type = IEC-xxx, RECT, COx or IEEE/ANSI

Delay Type Display threshold delay type.

IEC-STI

TMS Sets time multiplier setting (TMS) value for the curve
1.000 from 0.025 to 1.5 (step 0.001).

Reset Delay Type if “Delay type” = IEEE/ANSI or COx curve is selected

DMT only.
Selects the reset delay time type. Select between DMT
(Definitive Time) and IDMT (Inverse Time).
Rtms If “Reset Delay Type” = IDMT is selected.
0.025 Sets the Reverse Time Multiplier Setting (RTMS) value
associated with the IDMT reset time choice from 0.025 to
1.5 (step 0.001).
t Reset If “Reset Delay Type” is not “IDMT”.
0.10 s Sets the reset time value from 0 to 100s (step 10ms).

Ie> >> >>> Interlock of first threshold by the second and third
Interlock Yes thresholds, but only if first threshold trip is set to IDMT.
Setting choice: No, Yes
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 53/94

2.7.2.2 Submenu Second earth overcurrent threshold (Ie>>) protection

This section presents the main specific points for this submenu (Ie>> = Yes). Refer to §
2.7.2.1 for details (setting ranges, setting choices and availabilities).

Ie>> ? “Yes” or “DIR” option is selected.

Yes The second earth overcurrent threshold (Ie>>) protection is
enabled.
If “DIR” is selected, “Ue>>”, “Ie>> Torque” and “Ie>> Trip
zone” submenus are displayed.
Ie>> Sets the value for the second earth overcurrent threshold
1.000 Ien (Ie>>). Three earth overcurrent ranges are available:
- from 0.002 to 1 Ien, in steps of 0.001 Ien. Cortec code C
- from 0.01 to 8 Ien, in steps of 0.005 Ien. Cortec code B
- from 0.1 to 40 Ien, in steps of 0.01 Ien. Cortec code A
Ue>> If “Ie>> ?” = “DIR” only.
5.0 V Sets the value for the earth overvoltage threshold
associated to Ie>> (see P12y/EN AP section).
Input voltage range 2–130V: The threshold setting range is
from 1 to 260V, in steps of 0.1V.
Input voltage range 10–480V: The threshold setting range
is from 4 to 960V, in steps of 0.5V.
Ie>> If “Ie>> ?” = “DIR” only.
Torque 90 ° Sets the value for the torque angle between voltage and
current (see P12y/EN AP section), from 0° to 359 ° (step
1°).
Ie>> If “Ie>> ?” = “DIR” only.
Trip Zone ±10 ° Sets angle value for the Trip Zone. This defines the
operating region to either side of the torque angle. Setting
range is from ±10° to ±170°, in steps of 1°.
Delay Type Selects the time delay type associated with I>>.
DMT Setting choices are:
- “DMT” (definite minimum time): see section a,
- “RI” (electromechanical inverse time curve): section b,- -
IEC-xxx, CO2, CO8, IEEE-XX inverse time delay curve, see
section c,
- RECT curve, see section c..

a) Delay type = Definite Minimum Time

Identical to § 2.7.2.1, section a), with tIe> displaying setting value for the trip threshold (from
0 to 150s, step 10ms) and excluding the “Ie> >> >>> Interlock” submenu.
b) Delay type = RI - electromechanical inverse time curve
Identical to § 2.7.2.1, section b), excluding the “Ie> >> >>> Interlock” submenu.
c) Delay type = IEC-xxx, RECT, Cox or IEEE/ANSI
Identical to § 2.7.2.1, section b), excluding the “Ie> >> >>> Interlock” submenu.
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2.7.2.3 Submenu Third earth overcurrent threshold (Ie>>>) protection

Ie>>> ? “Yes”, “No”, “DIR” or “PEAK” option is selected.

Yes The third earth overcurrent threshold (Ie>>>) protection is
enabled.
If “DIR” is selected, “Ue>>>”, “Ie>>> Torque” and “Ie>>>
Trip zone” submenus are displayed.
Ie>>> Sets the value for the third overcurrent threshold Ie>>>.
1.000 Ien Three earth overcurrent ranges are available:
- from 0.002 to 1 Ien, in steps of 0.001 Ien. Cortec code C
- from 0.01 to 8 Ien, in steps of 0.005 Ien. Cortec code B
- from 0.1 to 40 Ien, in steps of 0.01 Ien. Cortec code A
Ue>>> If “Ie>>> ?” = DIR only
5.0 V Sets the values for the earth overvoltage threshold Ue>>>
associated to Ie>>> (see P12y/EN AP section).
Input voltage range 2–130V: The threshold setting range is
from 1 to 260V, in steps of 0.1V.
Input voltage range 10–480V: The threshold setting range
is from 4 to 960V, in steps of 0.5V.
Ie>>> If “Ie>>> ?” = DIR only
Torque 90 ° Sets the value for the torque angle between voltage and
current (see P12y/EN AP section), from 0° to 359 °, (step
1°).
Ie>>> If “Ie>>> ?” = DIR only
Trip Zone ±10 ° Sets angle value for the Trip Zone. This defines the
operating region to either side of the torque angle. Setting
range is from ±10° to ±170°, in steps of 1°.
tIe>>> Sets the time delay associated with Ie>>>, from 0 to 150 s,
0.04 s in steps of 10ms.

tReset Sets the value for the reset time, from 0 to 100 s, in steps of
0.10 s 10ms.

2.7.2.4 Submenu derived earth overcurrent threshold (Ie>>>>) protection

This section presents the main specific points for this submenu (tIe>>>> = Yes or DIR).
Ie>>>> represents the vectorial sum of the three phases. Refer to § 2.7.2.1 for details
(setting ranges, setting choices and availabilities).

Ie>>>> ? “Yes” or “DIR” option is selected.

Yes The derived earth overcurrent threshold (Ie>>>>)
protection is enabled.
Ie>>>> Sets the value for the derived earth overcurrent Ie>>>>
1.000 Ien Setting range from 0.10 Ien to 40.00 Ien, in steps of 0.01
Ien, default value: 1.00 Ien
Ue(Ie>>>>) If “Ie>>>> ?” = DIR only
100.0 V Sets the values for the earth overvoltage threshold
Ue>>>> associated to Ie>>>>.
Input voltage range 2–130V: The threshold setting range
is from 1 to 260V, in steps of 0.1V.
Input voltage range 10–480V: The threshold setting range
is from 4 to 720V, in steps of 0.5V.
Ie>>>> If “Ie>>> ?” = DIR only
Torque 90 ° Sets the value for the torque angle between voltage and
current. Setting range from 0° to 359 ° (step 1°).
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MiCOM P125/P126 & P127 Page 55/94

Ie>>>> If “Ie>>> ?” = DIR only

Trip Zone ±10 ° Sets angle value for the Trip Zone. This defines the
operating region to either side of the torque angle. Setting
range is from ±10° to ±170°, in steps of 1°.
Delay Type Selects the time delay type associated with Ie>>>>.
DMT Setting choices “DMT”: see a, “IDMT”: see b, “RI”: see c.

a) Delay type = Definite Minimum Time

Delay Type “DMT” is selected

DMT

tIe>>>> Set the value for the time delay associated with Ie>>>>
0.000 s from 0.00s to 150.0s (step 0.01s)

t Reset Reset time value. Setting range from 0.00s to 100.0s,

0 ms step 0.01s.

b) Delay type = Inverse Definite Minimum Time

Identical to § 2.7.2.1, section b).
c) Delay type = RI - electromechanical inverse time curve
Identical to § 2.7.2.1, section c).
d) Delay type = RXIDG for Netmanagements curves (P122 and P123, cortec B only)
Identical to § 2.7.2.1, section d).
2.7.3 Submenu [32] DIRECTIONAL POWER (P127 only)
The following table is a summary table of the measured parameters in according to the
configuration scheme:

Configuration Displayed Configuration Displayed Configuration Displayed

3Vpn on HMI 2Vpn+Vr on HMI 2Vpp + Vr on HMI
Direct Derived Derived
P (kW) Yes Yes Yes
measurement measurement measurement
Direct Derived Derived
Q (KVAr) Yes Yes Yes
measurement measurement measurement
Direct Derived Derived
S (KVA) Yes Yes Yes
measurement measurement measurement
Direct Derived Derived
Cos(Phi) [°] Yes Yes Yes
measurement measurement measurement
3Ph WHours Direct Derived Derived
Yes Yes Yes
Fwd measurement measurement measurement
3Ph WHours Direct Derived Derived
Yes Yes Yes
Rev measurement measurement measurement
3Ph VAr- Direct Derived Derived
Yes Yes Yes
Hours Fwd measurement measurement measurement
3Ph VAr- Direct Derived Derived
Yes Yes Yes
Hours Rev measurement measurement measurement
3Ph VA- Direct Derived Derived
Yes Yes Yes
Hours measurement measurement measurement
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2.7.3.1 Threshold setting

In the following menu, default menu displayed for P>, P>>, P<, P<<, Q>, Q>>, Q< and Q<<
is noted “10000× 1W”. The value displayed on MiCOM P127 HMI depends on the “input
voltage range” and “line secondary CT” parameters. The following table gives the various
cases of the setting ranges:

Input Line Setting range

voltage secondary Default value
range CT Min Max Step
Overpower Underpower
1A 1× 1W 10000× 1W 1× 1W 10000× 1W 1× 1W
2-130V
5A 1× 5W 10000× 5W 1× 5W 10000× 5W 1× 5W
1A 5× 1W 40000× 1W 1× 1W 40000× 1W 5× 1W
10-480V
5A 5× 5W 40000× 5W 1× 5W 40000× 5W 5× 5W

To obtain the power value in W, multiply the selected number by 1W or 5W. Example, for
100:

− if the secondary of the CT = 1A, the HMI will display “100× 1W” and P> = 100W,

− if the secondary of the CT = 5A, the HMI will display “100× 5W” and P> = 500W.

PROTECTION

[32] Directional Power Heading of three-phase active or reactive over power

protection.
This protection monitors:
– the active overpower limits for the two thresholds P> and
P>>,
– the active underpower limits for the two thresholds P<
and P<<,
– the reactive overpower limits for the two thresholds Q>
and Q>>,
– the reactive underpower limits for the two thresholds Q<
and Q<<,
For all the threshods, a directional angle can be adjusted
between triggering power

2.7.3.2 Active overpower protection

This directional power protection part follows “[32] directional power” menu. This part of the
menu monitors the active overpower thresholds P> and P>>.

P> ? Selection of the first active overpower threshold (P>)

No protection.
Setting choice: No, Yes
Yes: “P>”, “Directional Angle” and “tP>” menu are displayed
and P> protection is active,
No, the next window will show the threshold menu “P>> ?”.
P> If “P> ?” = Yes only
10000x 1W Sets the value for the first active overpower threshold P>.
Default value: 10kW or 40kW or 50kW or 200kW (see
§ 2.7.3.1)
Directional Angle If “P>> ?” = Yes only
0° Selection of the directional angle between active power and
triggering power.
Setting range from 0° to 359°, step 1°
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tP> If “P> ?” = Yes only

0.00 s Sets the time delay associated with P>.
The setting range is from 0 to 150s, in steps of 10ms.
P>> ? Selection of the second active overpower threshold (P>>)
No protection.
Setting choice: No, Yes
Yes: “P>>”, “Directional Angle” and “tP>>” menu are
displayed and P>> protection is active.
No: the next menu is “P< ?”
P>> If “P>> ?” = Yes only
10000x 1W Sets the value for the second active overpower threshold
P>>.
Default value: 10kW or 40kW or 50kW or 200kW (see
§ 2.7.3.1).
Directional Angle If “P>> ?” = Yes only
0° Selection of the directional angle between active power and
triggering power.
Setting range from 0° to 359°, step 1.
tP>> If “P>> ?” = Yes only
0.00 s Sets the time delay associated with P>>..
The setting range is from 0 to 150s, in steps of 10ms.

2.7.3.3 Reactive overpower protection

This directional power protection part follows “P<” (if No) or “tP<” menu. This part of the
menu monitors the active overpower thresholds Q> and Q>>.

Q> ? Selection of the first reactive overpower threshold (Q>)

No protection.
Setting choice: No, Yes
Yes: “Q>”, “Directional Angle” and “tQ>” menu are
displayed and Q> protection is active,
No, the next window will show the threshold menu “Q>> ?”.
Q> If “Q> ?” = Yes only
10000x 1W Sets the value for the first reactive overpower threshold Q>.
Default value: 10kW or 40kW or 50kW or 200kW (see
§ 2.7.3.1).
Directional Angle If “Q>> ?” = Yes only
0° Selection of the directional angle between reactive power
and triggering power.
Setting range from 0° to 359°, step 1.
tQ> If “Q> ?” = Yes only
0.00 s Sets the time delay associated with Q>.
The setting range is from 0 to 150s, in steps of 10ms.
Q>> ? Selection of the second reactive overpower threshold (Q>>)
No protection.
Setting choice: No, Yes
Yes: “Q>>”, “Directional Angle” and “tQ>>” menu are
displayed and Q>> protection is active,
No: the next menu is “Q< ?”
Q>> If “Q>> ?” = Yes only
10000x 1W Sets the value for the second reactive overpower threshold
Q>>.
Default value: 10kW or 40kW or 50kW or 200kW (see
§ 2.7.3.1).
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Directional Angle If “Q>> ?” = Yes only

0° Selection of the directional angle between reactive power
and triggering power.
Setting range from 0° to 359°, step 1.
tQ>> If “Q>> ?” = Yes only
0.00 s Sets the time delay associated with Q>>.
The setting range is from 0 to 150s, in steps of 10ms.

2.7.3.4 Active underpower protection

This directional power protection part follows “P>>” (if No) or “tP>>” menu. This part of the
menu monitors the active underpower thresholds P< and P<<.

P< ? Selection of the first active underpower threshold (P<)

No protection.
Setting choice: No, Yes
Yes: “P<”, “Directional Angle” and “tP<” menu are displayed
and P< protection is active,
No, the next window will show the threshold menu “P<< ?”.
P< If “P< ?” = Yes only
1x 1W Sets the value for the first active underpower threshold P<.
Default value: 1W or 5W or 20W or 25W (see § 2.7.3.1).
Directional Angle If “P< ?” = Yes only
0° Selection of the directional angle between active power and
triggering power.
Setting range from 0° to 359°, step 1.
tP< If “P< ?” = Yes only
0.00 s Sets the time delay associated with P<.
The setting range is from 0 to 150s, in steps of 10ms.
P<< ? Selection of the second active underpower threshold (P<<)
No protection.
Setting choice: No, Yes
Yes: “P<<”, “Directional Angle” and “tP<<” menu are
displayed and P<< protection is active.
P<< If “P<< ?” = Yes only
10000x 1W Sets the value for the second active underpower threshold
P<<.
Default value: 1W or 5W or 20W or 25W (see § 2.7.3.1)
Directional Angle If “P<< ?” = Yes only
0° Selection of the directional angle between active power and
triggering power.
Setting range from 0° to 359°, step 1.
tP<< If “P<< ?” = Yes only
0.00 s Sets the time delay associated with P<<..
The setting range is from 0 to 150s, in steps of 10ms.
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2.7.3.5 Underpower protection

This directional power protection part follows “Q>>” (if No) or “tQ>>” menu. This part of the
menu monitors the active underpower thresholds Q< and Q<<.

Q< ? Selection of the first reactive underpower threshold (Q<)

No protection.
Setting choice: No, Yes
Yes: “Q<”, “Directional Angle” and “tQ<” menu are
displayed and Q< protection is active,
No, the next window will show the threshold menu “Q<< ?”.
Q< If “Q< ?” = Yes only
1x 1W Sets the value for the first reactive underpower threshold
Q<.
Default value: 1W or 5W or 20W or 25W (see § 2.7.3.1).
Directional Angle If “Q< ?” = Yes only
0° Selection of the directional angle between reactive power
and triggering power.
Setting range from 0° to 359°, step 1.
tQ< If “Q< ?” = Yes only
0.00 s Sets the time delay associated with Q<.
The setting range is from 0 to 150s, in steps of 10ms.
Q<< ? Selection of the second reactive underpower threshold
No (Q<<) protection.
Setting choice: No, Yes
Yes: “Q<<”, “Directional Angle” and “tQ<<” menu are
displayed and Q<< protection is active.
Q<< If “Q<< ?” = Yes only
10000x 1W Sets the value for the second reactive underpower
threshold Q<<.
Default value: 1W or 5W or 20W or 25W (see § 2.7.3.1).
Directional Angle If “Q<< ?” = Yes only
0° Selection of the directional angle between reactive power
and triggering power.
Setting range from 0° to 359°, step 1.
tQ<< If “Q<< ?” = Yes only
0.00 s Sets the time delay associated with Q<<.
The setting range is from 0 to 150s, in steps of 10ms.

2.7.4 Submenu [32N] EARTH WATTMETRIC (P126 and P127 only)

PROTECTION

[32N] Earth Heading of [32N] earth wattmetric protection submenu.

Wattmetric

[32N] Mode : Selection of the function mode: “Pe” (wattmetric) or “Ie Cos”
Pe (active component of the earth fault current).
Each Pe and IeCos threshold has its own setting (time
delay, threshold value etc), and the following instructionas
are also valid for the two modes (Pe will change to IeCos>.
Pe> ? Selection of the first alarm threshold function for Pe>.
No These instructions are also valid for IeCos>.
Setting choice: No, Yes
Yes: the first earth wattmetric threshold (Pe> - Ie Cos)
protection window is shown (see § 2.7.4.1)
No: the next window will show the threshold menu “Pe>> ?”
- “IeCos>> ?”).
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Pe>> ? Selection of the second earth wattmetric threshold (Pe>>)

No protection. Setting choice: No, Yes
Yes the second earth wattmetric threshold (Pe>> -
IeCos>>) protection menu is shown (see § 0).
Pe> Pe>> Only activated if at least one of the Pe/IeCos thresholds is
ANGLE 90° enabled.
Displays the setting angle for Pe/IeCos from 0° to 359°
(step 1°). This angle is the RCA angle for the directional
earth fault power.

2.7.4.1 First earth wattmetric threshold (Pe>) protection

Pe> Sets the value for the first earth wattmetric threshold Pe>.
20 x 1 W High sensitivity current: 0.001 to 1 In
Input voltage range 2-130V: The setting range is from 0.2
to 20 x Ien W, in steps of 0.02 x Ien W.
Input voltage range 10-480V: The setting range is from 1
to 80 x Ien W, in steps of 0.1 x Ien W.
The setting range for IeCos> is from 0.002 to 1Ien, in steps
of 0.001.
Medium sensitivity current: 0.01 to 8 In
Input voltage range 2-130V: The setting range is from 1
to 160 x Ien W, in steps of 0.1 x Ien W.
Input voltage range 10-480V: The setting range is from 4
to 640 x Ien W, in steps of 0.5 x Ien W.
The setting range for IeCos> is from 0.01 to 8 Ien, in steps
of 0.005.
Low sensitivity current: 0.1 to 40 In
For range 2-130V from 10 to 800 x Ien W, in steps of 1 x
Ien W.
For range 10-480V from 40 to 3200 x Ien W, in steps of 5
x Ien W.
The setting range for IeCos> is from 0.1 to 40 Ien, in steps
of 0.01.
Delay Type Displays threshold delay time type. Setting choices are:
DMT DMT (definite time) RI for the electromechanical inverse
time curve, IEC-XX, CO2, CO8, IEEE-XX inverse time delay
curve and RECT curve.:
t Pe> If “Delay type” = DMT only
150.00 s Sets the value for the time delay associated with Pe> -or
IeCos>), from 0 to 150s (step 10ms).
K If “Delay type” = RI only
1.000 Selection of K value for the RI curve from 0.100 to 10 (step
0.005).
TMS If “Delay type” ≠ DMT and RI
1.000 Sets the time multiplier setting (TMS) value for the curve
from 0.025 to 1.5 (step 0,001).
Reset Delay Type If “Delay type” = IEEE/ANSI only.
IDMT Sets the reset delay time type.
Select between DMT (Definitive Time) and IDMT (Inverse
Time).
If IDMT is selected, “RTMS” menu is displayed.
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RTMS If “Reset Delay type” = IDMT only.

1.000 Sets the Reverse Time Multiplier Setting (RTMS) value
associated with the IDMT reset time choice, from 0.025 to
1.5 (step 0,001).
tReset menu is not displayed.
tReset Sets the the reset time value.
0.10 s The setting range is from 0 to 100 s, in steps of 10ms.

2.7.4.2 Second earth wattmetric threshold (Pe>>) protection

Pe>> ? If the user selects Yes the following menu is shown.

Yes

Pe>> Sets the value for the earth second wattmetric threshold
20 x 1 W Pe>>.
High sensitivity current: 0.001 to 1 In
Input voltage range 2-130V: The setting range is from 0.2
to 20 x Ien W, in steps of 0.02 x Ien W.
Input voltage range 10-480V: The setting range is from 1
to 80 x Ien W, in steps of 0.1 x Ien W.
The setting range for IeCos>> is from 0.002 to 1In, in steps
of 0.001.
Medium sensitivity current: 0.01 to 8 In
Input voltage range 2-130V: The setting range is from 1
to 160 x Ien W, in steps of 0.1 x Ien W.
Input voltage range 10-480V: The setting range is from 4
to 640 x Ien W, in steps of 0.5 x Ien W.
The setting range for IeCos>> is from 0.01 to 8 In, in steps
of 0.005.
Low sensitivity current: 0,1 to 40 In
Input voltage range 2-130V: The setting range is from 10
to 800 x Ien W, in steps of1x Ien W.
Input voltage range 10-480V: The setting range is from
40 to 3200 x Ien W, in steps of 5 x Ien W.
The setting range for IeCos>> is from 0.5 to 40 In, in steps
of 0.01.
tPe>> Sets the value for the second earth wattmetric threshold,
1.00 s from 0 to 150 s (step 10ms).

tReset Sets the value for the reset time from 0 to 100 s, in steps of
1.00 s 10ms.
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2.7.5 Submenu [46] NEG SEQ OC (P126 & P127 only)

PROTECTION G1

[46] Neg Seq OC Heading of the negative phase sequence overcurrent

threshold (I2>) protection submenu.

I2> ? Setting choice: Yes or No

No Yes: the first negative phase sequence overcurrent
threshold (I2>) protection is enabled. The first negative
phase sequence overcurrent threshold submenu (see §
2.7.5.1) is displayed.
No: the first negative phase sequence overcurrent threshold
(I2>) is not enabled, and the next menu is the “I2>> ?”
menu.
I2>> ? Setting choice Yes or No
No Yes: the second negative phase sequence overcurrent
threshold (I2>>) is enabled. The second negative phase
sequence overcurrent threshold submenu (see § 2.7.5.2) is
displayed.
No: the second negative phase sequence overcurrent
threshold (I2>>) is not enabled, and the next menu is the
“I2>>> ?” menu.
I2>>> ? Setting choice Yes or No
No Yes: the third negative phase sequence overcurrent
threshold (I2>>>) is enabled. The third negative phase
sequence overcurrent threshold submenu (see § 2.7.5.3) is
displayed.
No: the third negative phase sequence overcurrent
threshold (I2>>>) is not enabled.

2.7.5.1 Submenu First negative phase sequence overcurrent threshold (I2>) protection

I2> ? “Yes” option is selected.

Yes The first negative phase sequence overcurrent threshold
(I2>) is enabled
I2> Sets the value for the first negative phase sequence
1.00 In overcurrent threshold I2>. The threshold setting range is
from 0.1 to 25In (steps 0.01In).
Delay Type Displays threshold delay time type. Setting choices are:
DMT SMT, RI, RECT, IEEE EI, IEEE VI, C08, IEEE MI, C02,
IEC LTI, IEC EI, IEC VI, IEC SI and IEC STI
tI2> If “Delay type” = DMT only
150.00 s Sets the time delay associated with the first negative phase
sequence overcurrent threshold I2>, from 0 to 150 s (step
10ms).
K If “Delay type” = RI only
1.000 Selection of K value for the RI curve from 0.100 to 10 (step
0.005).
TMS If “Delay type” ≠ DMT and RI
1.000 Sets time multiplier setting (TMS) value associated to IEC
family of curves from 0.025 to 1.5 (step 0,001).
Reset Delay Type If “Delay type” = IEEE/ANSI only.
IDMT Displays the reset delay time type.
Select between DMT (Definitive Time) and IDMT (Inverse
Time).
If IDMT is selected, “RTMS” menu is displayed.
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RTMS If “Reset Delay type” = IDMT only.

1.000 Displays the Reverse Time Multiplier Setting (RTMS) value
associated with the IDMT reset time choice, from 0.025 to
1.5 (step 0,001).
tReset menu is not displayed.
tReset Displays setting value for the reset time.
0.10 s The setting range is from 0 to 100 s, in steps of 10ms.

2.7.5.2 Threshold Menu I2>>

I2>> ? “Yes” option is selected.

Yes second threshold of the negative phase sequence
overcurrent I2>> is enabled.
I2>> = Sets the second threshold of the negative phase sequence
5.00 In overcurrent I2>>
The threshold setting range is from 0.5 to 40 In, in steps of
0.01 In.
t I2>> Sets the time delay associated with I2>> from 0 to 150s
150.00 s (steps 10ms).

2.7.5.3 Threshold Menu I2>>>

I2>>> ? “Yes” option is selected.

Yes Third threshold of the negative phase sequence overcurrent
I2>> is enabled.
I2>>> Sets the value for the third threshold of the negative phase
10.00 In sequence overcurrent I2>>, from 0.5 to 40In (step 0.01In).

t I2>>> Sets the time delay associated with I2>> from 0 to 150s
150.00 s (step 10ms).

2.7.6 Submenu [49] Therm OL (P126 & P127 only)

PROTECTION G1

[49] Therm OL Heading of [49] submenu.

Therm OL ? Setting choice Yes or No

Yes Yes: the thermal overload function is enabled. Then the
following menu is displayed.
No: the thermal overload function is not enabled, and no
menu content is displayed.
Iθ > Sets the value for the thermal current threshold Iθ> from 0.1
0.50 In to 3.2In (step 0.01In).

Te Sets value for the Te thermal time constant associated with

10 mn the thermal overload formula from 1 min to 200mn (step
1mn).
K Sets the value for the K factor associated with the thermal
1.00 overload function, from 1 to 1.50 (step 0.01).

θ Trip Displays the percentage applicable to the thermal overload

100% trip threshold, from 50 to 200% (step 0.01).
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θ Alarm ? Setting choice Yes or No.

Yes Yes: the thermal overload alarm function is enabled. Then
the following menu is displayed.
No: the thermal overload function is not enabled and the
next menu is not activated.
θ Alarm Sets the percentage applicable to the thermal overload
80% alarm threshold, from 50 to 200% (step 0.01).

2.7.7 Submenu [37] UNDERCURRENT PROTECTION (P126 & P127)

Undercurrent function will:

− start as soon as the current of one phase is below I< threshold value (OR of the 3
phases current),

− trip if the current of one phase - at least - remains below this threshold during more
than tI<.
I< starting could be inhibited when CB is open (52a)

PROTECTION G1

[37] Under Heading of [37] undercurrent submenu.

Current

I< ? Setting choice Yes or No

Yes Yes: the first undercurrent threshold (I<) protection is
enabled. Then the following menu is displayed.
No: the first undercurrent threshold (I<) protection is not
enabled, and the next menu is not activated.
I< Sets the value for the undercurrent threshold I<, from 0.1 to
0.10 In 1In, in steps of 0.01In.

t I< Sets the time delay associated with I<, from 0 to 150 s (step
150.00 s 10ms).

I< inhibited on 52A When Yes is selected, this function inhibits undercurrent
protection on circuit breaker (52A) trip.
No

I< inhibited on U< P127 only

When “Yes” is selected, this function inhibits undercurrent
No protection on threshold undervoltage and displays the
following menu.
I< inhibited on U< When “I< inhibited on U<” = Yes only
Displays setting value for the I< threshold, from 10 to 480V
10 V (step 0.1V).
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2.7.8 Submenu [59] PHASE OVER-VOLTAGE Protection (P127)

PROTECTION G1

[59] Phase Heading of [59] Phase over-Voltage submenu.

Over Voltage

U> ? Setting choice: No, AND or OR

AND Selection of the first phase overvoltage threshold (U>)
protection.
If AND or OR is selected, the first phase overvoltage
threshold (U>) protection is enabled. The first phase
overvoltage threshold (U>) submenu is displayed.
If OR is selected, the first overvoltage stage alarm is
emitted if one phase (at least) is faulty. If AND is selected,
this alarm appears when the stage appears on the three
phases.
If No is selected, the first phase overvoltage threshold (U>)
protection is not enabled and the next menu is the “U>> ?”
menu.
U> If “U> ?” = AND or OR
260.0 V Sets the value for the alarm threshold:
- Input voltage range 2–130V: from 1 to 260V (step 0.1V).
- Input voltage range 10–480V: from 10 to 960V (step0.5V).
t U> If “U> ?” = AND or OR
600.00 s Sets the time delay associated with U>, from 0 to 600s
(step 10ms).
U>> ? Setting choice: No, AND or OR
OR Selection of the second phase overvoltage threshold (U>>)
protection.
If AND or OR is selected, the second phase overvoltage
threshold (U>>) protection is enabled. The second phase
overvoltage threshold (U>>) submenu is displayed.
If OR is selected, the second overvoltage stage alarm is
emitted if one phase (at least) is faulty. If AND is selected,
this alarm appears when the stage appears on the three
phases.
If No is selected, the second phase overvoltage threshold
(U>) protection is not enabled and no new window will be
shown.
U>> If “U>> ?” = AND or OR
260.0 V Sets the value for the second phase overvoltage threshold
(U>>).
- Input voltage range 2–130V: from 2 to 260V (step of 0.1V).
- Input voltage range 10–480V: from 10 to 960V (step 0.5V).
t U>> If “U>> ?” = AND or OR
600.00 s Sets the time delay associated with U>>, from 0 to 600s
(step 10ms).
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2.7.9 Submenu [27] PHASE UNDER-VOLTAGE Protection (P127)

PROTECTION G1

[27] Phase Heading of [27] phase under voltage submenu.

Under Voltage

U< ? Setting choice: No, AND or OR

Yes Selection of the first phase undervoltage threshold (U<)
protection.
If AND or OR is selected, the first phase undervoltage
threshold (U<) protection is enabled. The first phase
undervoltage threshold (U<) submenu is displayed,
If OR is selected, the first undervoltage stage alarm is
emitted if one phase (at least) is faulty. If AND is selected,
this alarm appears when the stage appears on the three
phases.
If No is selected, the first phase undervoltage threshold
(U<) protection is not enabled and the next menu is the
“U<< ?” menu.
U< If “U< ?” = AND or OR
5.0 V Sets the value for the first phase undervoltage threshold
(U<).
- Input voltage range 2–130V: from 2 to130V (step 0.1V).
- Input voltage range 10 –480V: from 10 to 480V (step
0.5V).
t U< If “U< ?” = AND or OR
150.00 s Sets the time delay associated with U< from 0 to 600s,
(steps 10ms).
52a Inhib. U< ? If “U< ?” = AND or OR
This function inhibits undervoltage protection on circuit
No breaker (52A) trip. Setting choice Yes or No.
U<< ? Setting choice: Yes or No
Yes Selection of the second phase undervoltage threshold
(U<<) protection.
Yes, the second phase undervoltage threshold (U<<) is
enabled. The second phase undervoltage threshold (U<<)
protection submenu is displayed.
No: The second phase undervoltage threshold (U<<)
protection is not enabled, and no new window will be
shown.
U<< If “U<< ?” = AND or OR
2.0 V Sets the value for the second phase undervoltage threshold
(U<<).
- Input voltage range 2–130V: from 2 to 260V (step 0.1V),
- Input voltage range 10–480V: from 10 to 960V (step 0.5V).
t U<< If “U<< ?” = AND or OR
600.00 s Sets the time delay associated with U<< from 0 to 600s
(step 10ms).
52a Inhib. U<< ? If “U<< ?” = AND or OR
This function inhibits undervoltage protection on circuit
No breaker (52A) trip. Setting choice Yes or No.
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MiCOM P125/P126 & P127 Page 67/94

2.7.10 Submenu [59N] RESIDUAL OVER-VOLTAGE Protection

PROTECTION G1

[59N] Residual Heading of [59N] residual (earth) overvoltage protection

Over Voltage submenu.

Ue>>>> ? Setting choice: Yes or No

Yes Selection of the residual overvoltage threshold (Ue>>>>)
protection.
Yes, the residual overvoltage threshold (Ue>>>>) is
enabled. The residual overvoltage threshold (Ue>>>>)
protection submenu is displayed,
No: The residual overvoltage threshold (Ue>>>>) is not
enable and no new window will be shown.
Ue>>>> If “Ue>>>> ?” = Yes
5.0 V Sets the value for the residual overvoltage threshold
(Ue>>>>).
- Input voltage range 2–130V: from 1 to 260V (step0.1V).
- Input voltage range 10–480V: from 10 to 960V (step 0.5V).
t Ue>>>> If “Ue>>>> ?” = Yes
600.00 s Sets the time associated with Ue>>>>.from 0 to 600 s (step
10ms).

2.7.11 Submenu [79] AUTORECLOSE (P126 & P127 only)

The autoreclose function provides the ability to automatically close the circuit breaker after a
fault.
Up to 4 shot cycles can be configured . Each cycle implements a dead time and a reclaim
time.
During the autorecloser cycle, if the relay receives an order to change setting group, this
order is kept in memory, and will only be executed after the timer has elapsed.
Autoreclose function is available if:
• a logical input is assigned to 52a state,
• and trip output relay is not latched to the earth and/or phase protection.

In addition to these settings, the user can fully link the autoreclose function to the protection
function using the menus “PROTECTION G1 / Phase OC” and “PROTECTION/ E/Gnd”.

PROTECTION G1

[79] Autoreclose Heading of [79] AUTORECLOSE submenu.

Autoreclose ? Selection of autoreclose function.

Yes Yes: the autoreclose function is enabled. Then the “Ext CB
Fail ?” menu is shown,
Immediately could appear the message:“Conflict Recloser”.
Do not worry, you are hardly beginning to set your ARC and
some settings must be worked out.
No: no new window will be shown.
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2.7.11.1 Selection Menu [79] EXTERNAL CB FAILURE

Ext CB Fail ? Allows the use of a dedicated input (CB FLT) to inform the
Yes autoreclose function of the state of the CB (failed or
operational). This signal has to be assigned to a digital input
by the Automatic Control inputs submenu
Setting choice Yes or No.
Yes: The CB will be declared fault and the autoreclose will
move in the locked status when the Ext. CB Fail time will be
elapsed and the Ext CB Fail will stand active. The Ext. CB
Fail timer will start when the tD will be expired. If during this
time the signal Ext CB Fail will disappear the ARC will
continue with its programmed cycles
No: next window will show the submenu “Ext Block ?”.
Ext CB Fail Time If “Ext CB Fail”=Yes option is selected only.
1.00 s Set the value for the external CB failure time delay tCFE.
The Ext. CB Fail timer will start when the tD will be expired.
If during this time the signal Ext CB Fail will disappear, the
ARC will continue with its programmed cycles. Once this set
time has elapsed, the information Ext CB Fail is validated.
Setting range is from 10ms to 600s (step 10ms).

2.7.11.2 Selection Menu [79] EXTERNAL BLOCKING

Ext Block ? Setting choice: Yes or No

Yes Allows the use of a dedicated input (Block_79) to block the
autoreclose function.
If you set this item to Yes to make it active you have to
assign to a digital input the function Block 79 by the inputs
submenu in Automatic control function. With the Ext. Block
actived (the relevant digital input supplied) the autoreclose
will move to the locked status after a protection trip involved
in the sequences matrix of the ARC.

2.7.11.3 Circuit breaker activity supervision

Rolling demand ? Setting choice: Yes or No

Yes Yes: activates the trip activity supervision. At the first trip
order generated, the relay starts a temporization during
which, if the current trip number reaches the
programmed max trips number, the relay stops the
pending autoreclose cycle (definitive trip).
Max cycles nb Setting range from 2 to 100 (step 1).
10 Sets the programmed maximum trip number.

Time period Setting range from 10mn to 1440mn (24h) (step 10mn).
10 mn Sets the temporization for trip activity supervision.

2.7.11.4 [79] Dead and Reclaim Time

The dead time (tD1, tD2, tD3 and tD4) starts when the digital input connected to the 52a,
auxiliary contact of the CB, is de-energised and the involved protection threshold reset. It
means that CB has tripped. If on trip protection the CB opening signal (52a) is lacking, after
a fixed time out of 2.00 s at 50 Hz or 1.67 s at 60 Hz, the ARC resets to the initial status. If
on trip protection the 52a signal changes status but the protection threshold trip stands the
tD timer will start when the protection trip threshold will disappear in the above case .
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MiCOM P125/P126 & P127 Page 69/94

The 52a signal has to be assigned to a digital input by the inputs submenu in Automatic
control function. The 52a signal is in accordance with the CB status.

Auxiliary Contact status CB Status

52A 52B -------------------
Valid Invalid Circuit Breaker open
Invalid Valid Circuit Breaker closed

Within the tD a further time window is active.This time window starts together to the td.It
expires after 50ms.
If within this time window a threshold involved in the trip of the CB and in the ARC cycle is
intermittent the ARC will be lock.

Dead Time Displays setting value of the first cycle dead time (tD1) for
tD1 0.30 s the autoreclose function from 0.01 to 300s (step 10ms).

Dead Time As above for the second cycle dead time (tD2).
tD2 180.00 s

Dead Time As above for the third cycle dead time (tD3).
tD3 180.00 s

Dead Time As above fir fourth cycle dead time (tD4).

tD4 180.00 s

Dead Time Sets the value after a first, second and third trip This dead
tI> 0.05 s time is used with an IDMT electromagnetic relay, and starts
tI>> 0.05 s when the CB opens. The induction disk returns to its initial
tI>>> 0.05 s position during this additional time
Setting range is from 50ms to 600s (step 10ms).
DeadTime As above for IE>, IE>> and IE>>>
tIe> 0.05 s Setting range is from 50ms to 600s (step 10ms).
tIe>> 0.05 s
tIe>>> 0.05 s

Reclaim Time Set the Reclaimer time value (tR). The reclaim time , starts
tR 180.00 s when the CB has closed. Setting range is from 20ms to
600s (step 10ms).
After the reclaim time, if the circuit breaker does not trip
again, the autoreclose function resets; otherwise, the relay
either advances to the next shot that is programmed in the
autoreclose cycle, or, if all the programmed reclose
attempts have been accomplished, it locks out.
If the protection element operates during the reclaim time
following the final reclose attempt, the relay will lockout and
the autoreclose function is disabled until the lockout
condition resets.
Inhib Time The “Inhib Time tI” timer is used to block the autoreclose
tI 5.00 s being initiated after the CB is manually closed onto a fault.
The lockout condition can reset by a manual closing after
the "Inhib Time tI".
Setting range from 0.01s to 600s, in steps of 10ms.

2.7.11.5 [79] Phase and Earth Re-closing Cycles

Phase Cycles Displays setting of autoreclose cycles externally started by

4 a phase protection trip signal or by tAux1.
Setting choice is from 0 to 4 cycles.
E/Gnd Cycles Displays setting of autoreclose cycles externally started by
4 an earth protection trip signal or by tAux2.
Setting choice is from 0 to 4 cycles.
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2.7.11.6 [79] Cycles allocation

CYCLES 4321 4321 are the cycles associated to the trip on tI> pick up
tI> 1101 1201 are the actions to be executed after the tI> time delay
has elapsed:
0 = no action on autorecloser: definitive trip (autoreclose will
move in the lock status),
1 = trip on tI> pick-up, followed by reclosing cycle
2 = no trip on tI> pick-up: and this whatever the setting is in
the “AUTOMAT. CRTL/Trip commands/Trip tI>” menu.
CYCLES 4321 As above for tI>>.
tI>> 1101

CYCLES 4321 As above for tI>>>.

tI>>> 1101

CYCLES 4321 As above for tIe>.

tIe> 1101

CYCLES 4321 As above for tIe>>.

tIe>> 1101

CYCLES 4321 As above for tIe>>>.

tIe>>> 1101

CYCLES 4321 As above for tPe/Iecos>.

tPe/Iecos> 1101

CYCLES 4321 As above for tPe/Iecos>>.

tPe/Iecos>> 1101

CYCLES 4321 4321 are the cycles associated to the trip on tI> pick up
tAux1 1101 1201 are the actions to be executed after the tI> time delay
has elapsed:
0 = no action on autorecloser: definitive trip (autoreclose will
move in the lock status),
1 = trip on tI> pick-up, followed by reclosing cycle,
2 = no trip on tI> pick-up: and this whatever the setting is in
the “AUTOMAT. CRTL/Trip commands/Trip tI>” menu,
3 = autoreclose without trip (trip order is inhibited and no
trip is performed from autoreclose function).
CYCLES 4321 As above for tAux2.
tAux2 1101

2.7.12 Submenu [81] Frequency (P127 only)

The following HMI description is given for F1 frequency. These menus are identical for F2,
F3, F4, F5 and F6 frequencies.

PROTECTION G1

[81] Frequency Heading of [81] Frequency protection submenu.

F1 ? Selection of the first alarm threshold function for

No over/underfrequency (F1). Setting choice: No, 81< or 81>.
If the user selects 81< or 81>, the “F1 (Fn +/- 4.9Hz)”
window is shown.
F1 (Fn +/- 4.9Hz) Displays setting value for the first alarm threshold, from
50 Hz 45.1 to 64.9Hz (step 0.01 Hz).

tF1 Displays setting value for the trip threshold from 0 to 600s
0.00 s (step 10ms).
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2.7.13 Submenu [81R] Freq. rate of change (P127 only)

The following HMI description is given for dF/dt1 rate of frequency. The menu is identical for
the 2nd to the 6th rates.

PROTECTION G1

[81R] Freq. rate of Heading of [81R] rate of change of frequency protection

change function.

dF/dt1 ? Activation of the 1st rate of frequency stage (delta f / delta t)

No Setting choice: Yes or No

dF/dt1= Setting of the 1st frequency variation (∆F) per second (∆t) in
1.0 Hz/s Hz/s with ∆t = 1 period (20ms at 50Hz)
Average value of dF/dt1 will be calculated using the number
of cycles set in the ‘CONFIGURATION / dF/dt Cycles.nb.’
menu.
The value is validated if it is repeted x times (x is set in the
‘CONFIGURATION / dF/dt Cycles.nb.’ menu).
Setting range; from –10Hz/s to +10Hz/s, step = 0.1Hz/s
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2.8 AUTOMAT. CTRL menu

The AUTOMAT. CTRL Menu makes it possible to programme the various automation
functions included in the MiCOM P125, P126 & P127 relays.
The different submenus are:

 AUTOMAT.   
CTRL
       
 Trip  Latch  Blockin (1)  Inrush (3)

Commands  Relays  Logic  Blocking

 Logic (2)  Output  Inputs  Brkn. (2)

 select 1/2  relays  1/2/3/4/5/6/7  Cond ?

 Cold (2)  51V (3)  VT (3)  CT (3)

 Load PU   Supervision  Supervision

 CB Fail (2)  CB (2)  SOTF (2)  Logic (2)

  Supervision   Equations
 Comm.Order   
 delay (3)

(1) P126 and P127: Blocking Logic 1/2

(2) P126 and P127 only
(3) P127 only
2.8.1 Submenu Trip Commands
This submenu makes it possible to assign some or all the selected thresholds to the trip logic
output (RL1).

TEXT P125 P126 P127 INFORMATION

Trip tI>, tI>> or X X Time delayed 1st, 2nd or 3rd phase overcurrent
tI>>> threshold trip.
Trip tIe>, tIe>> or X X X Time delayed 1st, 2nd or 3rd earth overcurrent
tIe>>> threshold trip.
Trip tIe>>>> X Time delayed derived earth overcurrent threshold
trip.
Trip tP> or tP>> X Time delayed 1st or 2nd directional power threshold
trip.
Trip tP< or tP<< X Time delayed 1st or 2nd active underpower threshold
trip.
Trip tQ> or tQ>> X Time delayed 1st or 2nd reactive overpower threshold
trip.
Trip tQ<< or tQ<< X Time delayed 1st or 2nd reactive underpower
threshold trip.
Trip tPe/IeCos>, X X X Time delayed 1st or 2nd earth overpower/IeCos
tPe/IeCos>> (wattmetric) threshold trip.
Trip tI2>, tI2>> or X X Time delayed 1st, 2nd or 3rd negative phase sequence
tI2>>> overcurrent threshold (tI2>) trip.
Trip Thermal θ X X Thermal overload threshold trip.
Trip tU> or tU>> X Time delayed 1st or 2nd overvoltage threshold trip.
Trip tU< or tU<< X Time delayed 1st or 2nd undervoltage threshold trip.
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MiCOM P125/P126 & P127 Page 73/94

TEXT P125 P126 P127 INFORMATION

Trip tF1 to tF6 X Time delayed 1st to 6th frequency threshold trips.
Trip dF/dt1 to X 1st to 6th rates of change of frequency protections.
dF/dt6
Trip Brkn. Cond X X Broken conductor detection signal trip.
Trip tAux1 to tAux4 X X X Time delayed auxiliary input Aux1 to Aux4 trips.
Trip tAux5 to tAux7 X X Time delayed auxiliary input Aux5 to Aux7 trips.
Trip tAux8 to tAuxC X Time delayed auxiliary input Aux8 to Aux C trips
(option).
Trip SOTF X X SOTF function to the trip output. When the tSOTF
has elapsed, the trip command is ordered. .
Ctrl Trip X X X Control Trip function to the trip output relay RL1.
Trip tEQU A to X X Logical output of Boolean Equations A to H.
tEQU H

AUTOMAT. CTRL

Trip Commands Heading of Trip Commands submenu.

function Setting choice Yes: Assign the corresponding time delay or

No function to the trip output relay RL1. Then the trip output
relay (RL1) will be activated at the end of the time delay tI>.
Setting choice No: the trip output relay (RL1) will never be
activated, even at the end of the corresponding time delay
or function.
Refer to previous tables for protection functions list.

2.8.2 Submenu Latch Relays

With this submenu the user can program trip functions so that the resulting output signal will
remain latched after the cause for exceeding the threshold has disappeared.
2.8.2.1 Submenu Latch Relays
With the following menu the user can set each output relay as latched or not latched.
A “0” assigned to an output relay means that the relay is not latched. The output relay will be
active when the relevant command will be active; the relay will not be active when the
relevant command will reset.
A “1” setting assigned to an output relay means that the relay is latched. The output relay will
be active when the relevant command will be active; the relay will remain active, if the
relevant command will reset.
The active latched output relays can be reset by a logic input assigned to this function.
Further, the active latched output relays can be reset from the front panel by pushing .
This action is available if the window status Output Relays in OP. PARAMETERS submenu
is displayed.
The alarm string “Latched Relays” appears on LCD and the yellow LED is lighted.
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AUTOMAT. CTRL

Latch Relays Heading of submenu.

Latch :87654321 P125: only relays 1 to 6 are displayed.

01001000 In this example, the output relays set to Latch function are
number 4 and 7 (RL4 & RL7).

2.8.3 Submenu Blocking Logic

The MiCOM P125 relay has the submenu Blocking Logic available for setting. MiCOM P126
& P127 relays have the submenu Blocking Logic 1 and Blocking Logic 2 available for setting.
By opening the Blocking Logic submenu the user can assign each delayed threshold to the "Blk
Log" input (refer to Inputs menu).
It is possible to enable or disable the “blocking” of most protection functions even if a logic
input has been assigned to that function.

TEXT P125 P126 P127 INFORMATION

tI>, tI>> or X X Time delayed 1 , 2 or 3rd phase overcurrent threshold.
st nd

tI>>>
tIe>, tIe>> or X X X Time delayed 1st, 2nd or 3rd earth threshold.
tIe>>>
tIe>>>> X Time delayed derived earth overcurrent threshold trip.
tP> or P>> X Time delayed 1st or 2nd active overpower threshold.
tP> or tP>> X Time delayed 1st or 2nd active power threshold.
P< or P<< X Instantaneous 1st or 2nd active underpower thresholds.
tP< or tP<< X Time delayed 1st or 2nd active underpower thresholds.
Q> or Q>> X Instantaneous 1st or 2nd reactive overpower thresholds.
tQ> or tQ>> X Time delayed 1st or 2nd reactive overpower thresholds.
Q< or Q<< X Instantaneous 1st or 2nd reactive underpower thresholds.
tQ< or tQ<< X Time delayed 1st or 2nd reactive underpower thresholds.
tPe/IeCos>, X X X Time delayed 1st or 2nd earth overpower/IeCos (wattmetric)
tPe/IeCos>> threshold.
tI2>, tI2>>or X X Time delayed 1st, 2nd or 3rd negative phase sequence
tI2>>> overcurrent threshold.
tThermal θ X X Time delayed thermal overload threshold.
tI< X X Time delayed undercurrent threshold.
st nd
tU> or tU> X Time delayed 1 or 2 overvoltage threshold.
st nd
tU< or tU<< X Time delayed 1 or 2 undervoltage threshold.

tUe>>>> X X X Time delayed derived earth overvoltage threshold.

tF1 to tF6 X Time delayed 1st, 2nd, to 6th frequency thresholds.
dF/dt1 to X Rates of change of frequency 1 to 6.
dF/dt6
tBrk. Cond X X Broken Conductor trip signal.
tAux1 to X X X Aux1 (to tAux4) delayed by tAux1 (to tAux4) time (Aux1,
tAux4 2, 3 and 4 logic inputs and aux1, 2, 3 and 4 times are set
with “automat ctrl/inputs” menu).
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TEXT P125 P126 P127 INFORMATION

tAux5 to X X Aux5, 6 and 7 delayed by tAux 5, tAux6 and tAux 7 times.
tAux7
tAux8 to X Aux8 to Aux C delayed by tAux 8 to tAux C times (option).
tAuxC

Blocking of a protection function can be prevented if “No” is selected in the relevant window.
Blocking of a protection function can be enabled if “Yes” is selected in the relevant window.

AUTOMAT. CTRL

Blocking Logic Heading of Blocking Logic submenu.

Block function Enables or disables blocking logic of the function on the

No level (logic state =1) of logic input “Blk Log”.
Refer to previous tables for protection functions list.

2.8.4 Submenu Inrush Blocking Logic (P127 only)

Through the Inrush Blocking Logic submenu, the user can set a 2nd harmonic blocking
threshold and block each delayed overcurrent threshold by setting.
It is possible to enable or disable the “blocking” of most protection functions even if a logic
input has been assigned to that function. Blocking of a protection function can be prevented
if “No” is selected in the relevant window (see below). Blocking of a protection function can
be enabled if “Yes” is selected in the relevant window.

TEXT INFORMATION
I>, I>> or I>>> Instantaneous 1st, 2nd or 3rd phase overcurrent threshold.
Ie>, Ie>> or Ie>>> Instantaneous 1st, 2nd or 3rd earth overcurrent threshold.
Ie>>>> Derived earth overcurrent threshold.
I2>, I2>> or I2>>> Instantaneous 1st, 2nd or 3rd negative phase sequence
overcurrent threshold.

AUTOMAT. CTRL

Blocking Inrush Heading of the Inrush Blocking logic submenu.

Blocking Inrush Setting choice Yes: The crossing of the Harmonic H2 ratio
Yes threshold on any phase activates the Inrush Blocking Logic
function instantaneously.
Setting choice No: The crossing of the Harmonic H2 ratio
threshold doesn’t activate the Inrush Blocking logic function.
Inr. Harmonic 2 Ratio = Set the value for the 2nd harmonic threshold ratio
20% calculated as a percentage of the fundamental
component from 10 to 35% (step 0.1%). Press  to
validate your choice.
T Inrush reset = Set the value for the Inrush tReset time. This provides a
reset delay of the Inrush Blocking signal (logic state=1)
0 ms once the 2nd harmonic level falls below the set threshold.
The setting range is from 0.0s to 2 s (step 10ms).
Blocking Inrush Function Enables or disables Inrush blocking for the function.
No Refer to previous tables for protection functions list.
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2.8.5 Submenu Logic Select

With the submenu Logic Select. 1 or Logic Select. 2 the user can assign each trip threshold to
the "Log Sel" input (refer to Inputs menu).
The submenu Logic Select. 1 / Logic Select. 2 is only available in the software of the P126 &
P127 relays. The thresholds I>>, I>>> are from the protection function [67/50/51] and Ie>>,
Ie>>> from the protection function [67N/50N/51N].
Setting Yes or No enables or disables Logic Selectivity 1 of the following protection
functions:

AUTOMAT. CTRL

Logic Select. 1 Heading of Logic Select submenu.

Sel1 tI>> Second trip threshold for phase overcurrent (tI>>).

Sel1 tI>>> Third trip threshold for phase overcurrent threshold (tI>>>).

Sel1 tIe>> Second trip threshold for earth fault overcurrent (tIe>>).

Sel1 tIe>>> Third trip threshold for earth fault overcurrent (tIe>>>).

Sel1 tIe>>>> P127 only

Time delayed derived earth overcurrent threshold trip.

t Sel1 Displays time delay t Sel1 for Logic Select 1 .

150.00 s The setting range for t Sel1 is from 0 s to 150 s, in steps of
10 ms.

2.8.6 Submenu Outputs Relays

This submenu makes it possible to assign various alarm and trip thresholds (instantaneous
and/or time delay) to a logic output. Excepted from this option are the Watchdog (RL0) and
the Tripping (RL1) outputs (refer to Trip Commands submenu).
The total number of programmable logic outputs for the three relay models is listed in the
table:

Model P125 P126 P127

Output relays 6 8 8

The following protection functions can be assigned to output relays using this submenu.

Function P125 P126 P127 INFORMATION

Trip X X output signal Trip (RL1).
I>, I>> or I>>> X X Instantaneous 1st, 2nd or 3rd phase overcurrent
threshold.
tI>, tI>> or tI>>> X X Time delayed 1st, 2nd or 3rd phase overcurrent
threshold.
I_R>, I_R>> or X X 1st, 2nd or 3rd trip threshold for directional phase OC
I_R>>> from the inverse trip zone (I_R>).
tIA>, tIB> or tIC> X X Linking first delayed threshold for phase A (tIA>),
phase B (tIB>) or phase C (tIC>).
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MiCOM P125/P126 & P127 Page 77/94

Function P125 P126 P127 INFORMATION

Ie>, Ie>> or Ie>>> X X X Instantaneous 1st, 2nd or 3rd earth overcurrent
threshold.
tIe>, tIe>> or X X X Time delayed 1st, 2nd or 3rd earth overcurrent
tIe>>> threshold.
Ie_R>, Ie_R>> or X 1st, 2nd or 3rd trip threshold for directional earth fault
Ie_R>>> overcurrent from the inverse trip zone (Ie_R>).
Ie>>>> X Derived earth overcurrent threshold.
tIe>>>> X Time delayed threshold of derived earth
overcurrent.
P> or P>> X Instantaneous 1st or 2nd active overpower threshold.
tP> or tP>> X Time delayed 1st or 2nd active overpower threshold.
P< or P<< X Instantaneous 1st or 2nd active underpower
threshold.
tP< or tP<< X Time delayed 1st or 2nd active underpower threshold.
Q> or Q>> X Instantaneous 1st or 2nd reactive overpower
threshold.
tQ> or tQ>> X Time delayed 1st or 2nd reactive overpower
threshold.
Q< or Q<< X Instantaneous 1st or 2nd reactive underpower
threshold.
tQ< or tQ<< X Time delayed 1st or 2nd reactive underpower
threshold.
Pe/IeCos> or X X X Instantaneous 1st or 2nd earth overpower/IeCos
Pe/IeCos>> (wattmetric) threshold.
tPe/IeCos> or X X X Time delayed 1st or 2nd earth overpower/IeCos
tPe/IeCos>> (wattmetric) threshold.
I2>, I2>> or I2>>> X X Instantaneous 1st, 2nd or 3rd negative phase
sequence overcurrent threshold.
tI2>, tI2>> or X X Time delayed 1st, 2nd or 3rd negative phase
tI2>>> sequence overcurrent threshold.
ThermAlarm X X thermal alarm.
ThermTrip X X thermal trip threshold.
I< X X Instantaneous undercurrent threshold.
tI< X X Time delayed undercurrent threshold.
st nd
U> or U>> X Instantaneous 1 or 2 overvoltage threshold.
st nd
tU> or tU>> X Time delayed 1 or 2 overvoltage threshold.
st nd
U< or U<< X Instantaneous 1 or 2 undervoltage threshold.
st nd
tU< or tU<< X Time delayed 1 or 2 undervoltage threshold

Ue>>>> X X X Instantaneous derived earth overvoltage threshold.

tUe>>>>: X X X Time delayed derived earth overvoltage threshold.
F1 to F6 X Instantaneous 1st to 6th frequency threshold.
tF1 to tF6 X Time delayed 1st to 6th frequency threshold.
F.OUT X Frequency out of range signal.
dF/dt1 to dF/dt6 X 1st to 6th rates of change of frequency.
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Function P125 P126 P127 INFORMATION

BrknCond X X Broken Conductor alarm signal.
CBAlarm X X circuit breaker alarm function signal (CB Open NB,
Amps(n), CB Open Time and CB Close Time).
52 Fail X X circuit breaker trip supervision failure function
signal.
CBFail X X circuit breaker failure function timer signal (tBF).
CB Close X X circuit breaker closing order signal.
tAux1 to tAux6 X X X Aux1 to Aux4 delayed by Aux1 to Aux4 times.
tAux5 ti Aux7 X X Aux5 to Aux7 delayed by Aux 5 to Aux7 times.
tAux8 to tAuxC X Aux8 to AuxC delayed by Aux 8 to Aux C times
(optional configuration).
79 Run X X "autoreclose in progress" information.
79 Trip X X autoreclose final trip signal.
79 int. Lock X X Autoreclose lock activated by the internal process
of the autoreclose.
79 ext. Lock X X Autoreclose lock activated by the input “block 79”.
SOTF X X SOTF functionality.
CONTROLTRIP X X X Control Trip command.
CONTROLCLOSE X X X Control Close command.
ActiveGroup X X X Close when Group 2 is active
Input1 to Input4 X X X opto input 1 status to opto input 4 status.
Input5 to input7 X X opto input 5 status. to opto input 7 status.
Input8 to inputC X opto input 8 status to opto input C status (optional
configuration).
VTS X Voltage Transformer Supervision signal.
CTS X Current Transformer Supervision signal (P127).
tEQU.A to tEQU.H X X logic equation A to logic equation H results trip
signals.
Order Comm1 to X Remote commands 1 to 4.
Order Comm4

AUTOMAT. CTRL

Output Relays Heading of Output Relays submenu.

Function :8765432 Assigning the corresponding porotection function to the

0000010 output relays; i.e. to output 3 (RL3)
Setting choice: 1 assigns the output relay; 0 no
assignement.
Function :65432 Submenu for P125
00010
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MiCOM P125/P126 & P127 Page 79/94

2.8.7 Submenu Inputs

Each relay model has a fixed number of opto-isolated logic inputs.
Logic inputs:

Model P125 P126 P127 P127 with additional

inputs (option)
Logic Input 4 7 7 12

With the submenu Inputs it is possible to assign a label or an automation function to each
logic input (see the following table):

Label
Label description P125 P126 P127
designation
Unlatch Unlocks latched output relays X X X
Blk Log 1 Blocking logic 1 X X X
Blk Log 2 Blocking logic 2 X X
52 a Position of the circuit breaker (open) X X
52 b Position of the circuit breaker (close) X X
CB FLT External failure information from the CB X X
Aux 1 to Aux 4 Assigning external information to inputs Aux1 to Aux4 X X X
Aux 5 to Aux 7 Assigning external information to inputs Aux5 to Aux7 X X
Aux 8 to Aux C Assigning external information to inputs Aux8 to AuxC X
(optional configuration)
Strt Dist Starting of the disturbance recording function X X
Cold L PU Cold load pick up assignment X X
Log Sel 1 Logic selectivity 1 X X
Log Sel 2 Logic selectivity 2 X X
Change set Change of setting group (default setting group 1) when X X
the changing group parameter (‘CONFIGURATION /
Group select / change group’) is set to input.
Block_79 Blocking of the autoreclose function [79] X X
θ Reset Reset of the thermal state X X
Trip Circ Trip circuit supervision input X X
Start t BF Start CB fail timer from external input X X
Maint. M Maintenance Mode ON/OFF change X X X
SOTF Start the Switch On To Fault automatism X X
Local mode condition (if active, any remote operation
Local X X X
involving the output relays is forbidden)
Synchro. Assign a Time synchronisation input X X X
LED Reset or Reset of the "Trip" & "Alarm" leds
X X X
Reset Led
Ctrl Trip Assign a control trip function to the input. When X X X
activated, it is possible to order output relay(s) affected
to the control trip function.
Ctr Close Assign a control close function to the input. When active-
ted, it is possible to order output relays affected to the CB
X X X
Close (P126) or control close (P125 or P126) function.
For P127, this input can be started by the SOTF feature.
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 AUTOMAT.   
CTRL
    
 Inputs  …  
 

  
 Input 1  Input 2 ... Input 8/C  Aux Times
 

2.8.7.1 Setting auxiliary timers at the end of submenu Inputs

AUTOMAT. CTRL

Inputs Heading of Inputs submenu.

Input 1 Assigning label 52a to logic input 1.

52a To modify see above windows.

Input 2 Assigning label 52b to logic input 2.

52b To modify see above windows.

Input 3 Assigning label Aux1 to logic input 3.

Aux1 To modify see above windows.

Input 5 Assigning label Log Sel 1 to logic input 5 (P126 & P127
Log Sel 1 only).
To modify see above windows.
Input 6 Assigning label Block_79 to logic input 6 (P126 & P127
Block_79 only).
To modify see above windows.
Input 7 Assigning label Cold L PU to logic input 7 (P126 & P127
Cold L PU only).
To modify see above windows.
Input 8 … Assigning label to logic inputs 8 to 12 (C) (P127 with
Input C optional board only).
To modify see above windows.
Aux1 Time Displays setting value of timer assigned to logic input Aux1
tAux1 200.00 s from 0 ms to 200 s, in steps of 10 ms.

Aux2 Time As Aux1 for input Aux2.

tAux2 200.00 s

Aux 3 Time As Aux1 for input Aux3.

tAux 3 200.00 s

Aux4 Time As Aux1 for input Aux4.

tAux4 200.00 s

Aux5 Time As Aux1 for input Aux 5.

tAux5 200.00 s Setting value: from 0ms to 20000s (step 10ms)

Aux6 Time As Aux1 for input Aux 6.

tAux6 200.00 s Setting value: from 0ms to 20000s (step 10ms)

Aux7 Time As Aux1 for input Aux 7.

tAux7 200.00 s Setting value: from 0ms to 20000s (step 10ms)
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MiCOM P125/P126 & P127 Page 81/94

Aux8 Time As Aux1 for input Aux 8, Aux 9, Aux 10, Aux 11 and Aux 12.
tAux8 200.00 s (optional configuration only).
…
Aux C Time
tAuxC 200.00 s

2.8.8 Submenu Broken Conductor (P126 & P127 only)

AUTOMAT. CTRL

Broken Conductor Heading of Broken Conductor detector submenu.

Brkn. Cond ? Selection of the Broken Conductor function.

No If Yes is selected, the “Brkn.Cond Time” menu is displayed:
If No is selected, the Broken Conductor function is inactive.
Brkn.Cond Time Displays delay timer setting (tBC) for the Broken Conductor
tBC 14400 s function. from 0 to 14400s (step 1s).

Ratio I2/I1 Displays value, in percent, for the Broken Conductor

20 % threshold. This threshold is the ratio between negative and
positive phase sequence current.
Setting range is from 20 to 100% by, in steps of 1%.

2.8.9 Submenu Cold Load PU (P126 & P127 only)

The Cold Load Pick-Up (CLP) submenu allows enabling of the cold load pick-up function and
the associated settings.

TEXT P126 P127 INFORMATION and COMMENTS

tI> ? X X Time delayed I> threshold.
tI>> ? X X Time delayed I>> threshold.
tI>>> ? X X Time delayed tI>>> threshold.
tIe> ? X X Time delayed tIe> threshold.
tIe>> ? X X Time delayed tIe>> threshold.
tIe>>> ? X X Time delayed tIe>>> threshold.
tIe>>>> ? X X Time delayed derived earth overcurrent
threshold.
tI2> ? X X Time delayed tI2> threshold.
tI2>> ? X X Time delayed tI2>> threshold.
ti2>>> ? X X Time delayed tI2>>> threshold.
t Therm. ? X X Time delayed Thermal overload threshold.

AUTOMAT. CTRL

Cold Load PU Heading of Cold Load Pick-Up submenu.

In the following list, setting choice “Yes” assigns the corresponding function with the
loading pick-up function:
Cold Load PU ? Cold load pick-up function.
No If Yes is selected, the following menu is displayed:
If No is selected, the cold load pick-up function is inactive.
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Input? Setting choice “Yes” / “No”

Yes If selected, the CLP will be started by digital input 52A
(selected using the “Cold Load PU xxx” menus).
Auto? Setting choice “Yes” / “No”
No If selected, the CLP will be started by the automatic
detection of the CB closing when I grows from 5% IN to
more than IN in less than 200ms.
If “Input?” and “Auto?” are selected, CLP will be started by
digital input 52A and automatic detection of CB closing.
Cold Load PU Setting choice “Yes” assigns the corresponding function
Function ? No (see the previous table) with the loading pick-up function.

Cold Load PU Displays scaling value, in percent, for the cold load pick up
Level 200 % assigned to the selected thresholds from 20% to 800%
(step 1%).
Cold Load PU Displays delay timer setting (tCL) for the Cold Load Pick-up
tCL 3600.0 s function, from 0.1 to 3600s (step 100ms).

2.8.10 Submenu 51V (Overcurrent controlled by voltage transformer control (P127 only))
The 51V function can be inhibited when a VT fault occurs, using “Automatic Ctrl” / “VT
Supervision” / “VTS Blocks 51V” menu

51V Heading of 51V submenu.

(U< OR V2>) & I>>? Enable or disable the control of the start of the I>> by U<
No and V2 > stages value. Setting choice: Yes or No

V2>? Assigning the V2> threshold value for the inverse voltage
130V 47 for the I>> control. Select from 3V to 200V (step 0.1V).

(U<< OR V2>>) & I>>>? Enable or disable the control of the start of the I>>> by U<<
No and V2 >> stages value.Setting choice: Yes or No

V2>>? Assigning the V2>> threshold value for the inverse voltage
130V 47 for the I>>> control. Select from 3V to 200V by step of
0.1V.

2.8.11 Submenu VT Supervision (P127 only)

VT Supervision Heading of the Voltage Transformer Supervision(VTS)

VTS? Enable or disable the VT supervision function. Setting

No choice: Yes or No
If Yes is selected, the “VT Supervision” menu is activated
and displayed:
If No is selected, the VT Supervision function is inactive.
VTS Alarm? The VTS function can issue an alarm signal when the
No Voltage Transformer is lost. Setting choice: Yes or No
If No is selected, the Alarm (message and LED) will not be
displayed.
An alarm can be caused by an internal VT fault,
overloading, or faults on the interconnecting wiring.
VTS Blocks 51V? The VTS function can block the 51V function when a VTS
No alarm occurs (see § 2.8.10). Setting choice: Yes or No
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MiCOM P125/P126 & P127 Page 83/94

VTS Blocks Protections? The VTS function can be used to block voltage dependent
No functions and to change directional overcurrent into non-
directional functions. Setting choice: Yes or No
Note: all voltage and power protections are blocked if VT
fault occurs.
VTS Non-dir Displayed when “VTS blocks protections?” = Yes, This
I> Yes menu is used to change directional overcurrent in non-
I>> Yes directional function.
I>>> Yes If Yes is selected, the directional overcurrent will be
Ie> Yes changed into a non-directional overcurrent protection
Ie>> Yes function for the corresponding threshold,
Ie>>> Yes
Ie>>>> Yes If No is selected, even if VTS.

tVTS Sets the VTS timer. The VTS alarm will occur if VT fault
0.0s occurs during more than the VTS timer.
Setting range is from 0 to 100s, in steps of 10ms.

2.8.12 Submenu CT Supervision (P127)

The Current Transformer Supervision (CTS) is used to detect failure of one or more of the ac
phase current inputs to the relay. The CT supervision feature operates on detection of
derived zero sequence current, in the absence of corresponding derived zero sequence
voltage normally associated. The CTS alarm will occur when zero sequence current is above
Ie> and zero sequence voltage is below Ue<, during more than tCTS time delay.

CT Supervision Heading of the Current Transformer Supervision (CTS).

CT Supervision? Enable or disable the CT supervision function. Setting

No choice: Yes or No.
If Yes is selected, the “CT Supervision” menu is activated
and displayed:
If No is selected, the CT Supervision function is inactive.
Ie> Selection of the zero sequence current threshold associated
0.08 In to the CT Supervision detection function, from 0.08 × In to
1.0 × In (step 0.01 × In)
Ue< Selection of the zero sequence voltage threshold
5V associated to the CT Supervision detection function,
Setting ranges:
– from 0.5V to 22V, in steps of 0.1V (voltage input range 57
to 130V, P127xA)
– from 2V to 88V, in steps of 0.5V (for voltage input range
220 to 480V, P127xB)
tCTS Displays time delay setting (tCTS) for the CTS function.
0.2s Setting range from 0s to 100s, in steps of 10ms.
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2.8.13 Submenu Circuit Breaker Fail (P126 & P127 only)

With the CB Fail submenu circuit breaker failure can be detected and associated parameters
can be set. This protection feature is only available for P126 & P127 relays.

CB Fail Heading of CB Fail sub menu.

CB Fail ? Selection of the circuit breaker failure function. Setting

No choice: Yes or No
If Yes is selected, the following menu is displayed:
If No is selected, the CB Fail function is inactive.
I< BF Selection of the under current threshold associated to the
0.02 In CB failure detection function, from 0.02In to 1In (step
0.01In).
CB Fail Time Displays time delay setting (tBF) for the CB Fail function.
tBF 0.00 s Setting range is from 0 to 10 s, in steps of 10 ms.

Block I>? Select the possibility to block the instantaneous signal I> in
Yes case of circuit breaker failure detection. Setting choice: Yes
or No
Block Ie>? Select the possibility to block the instantaneous signal Ie>
Yes in case of circuit breaker failure detection.Setting choice:
Yes or No

2.8.14 Submenu Circuit Breaker Supervision (P126 & P127 only)

With the CB Supervision submenu circuit breakers can be supervised and monitored, and
associated parameters can be set.

 AUTOMAT.
CTRL

 CB Supervision

 No No No
TC Supervision CB Open S'vision CB Close S'vision CB Open Alarm ?
Yes Yes Yes Yes
 tTrip Circuit tSUP CB Open Time CB Close Time CB Open NB =

No
ΣAmps(n) ? n t Open Pulse t Close Pulse
Yes
ΣAmps(n) ?

AUTOMAT. CTRL

CB Supervision Heading of the CB Supervision submenu.

TC Supervision Selection of the trip circuit supervision function.

If Yes is selected, the “t Trip Circuit t SUP” menu is
Yes
displayed.
t Trip Circuit Displays the delay timer setting (tSUP) for TC supervision,
from 0.1 to 10s (step 10ms).
t SUP 200 ms

CB Open S'vision Selection of the time monitoring function of CB open

operations.
Yes
If Yes is selected, the “CB Open Time” menu is displayed.
CB Open Time Displays monitoring time for CB open operations. from 0.05
to 1.0s (step 10ms).
100 ms
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MiCOM P125/P126 & P127 Page 85/94

CB Close S'vision Selection of the time monitoring function of CB close

operations. If Yes is selected, “CB Close” window is
Yes
displayed.
If No is selected the next window is CB Open Alarm.
CB Close Time Displays monitoring time for CB close operations, from
0.050 to 1.0s (steps of 10 ms).
100 ms

CB Open Alarm ? Selection of the monitor function for maximum count of CB

operations.
Yes
If Yes is selected, the “CB Open NB” window is displayed.
CB Open NB = Displays alarm threshold for CB open count from 0 to 50000
(step 1).
0
Selection of the monitoring function that continuously sums
ΣAmps(n) ?
the current (in Amps or square Amps) interrupted by the CB.
Yes
Setting choice: Yes, No.
If Yes is selected, “ΣAmps(n) ?” window is displayed.
Displays alarm threshold for the summation of the current (in
ΣAmps(n) ?
Amps or square Amps) interrupted by the CB, from 0 to
1000 E6
4000 E6 A (or A²) (step 1 E6). (E6 = 106)
n 1 Displays the exponent for the summation (I A or I² A²).
Setting choice for n: 1or 2

t Open Pulse Displays and sets the tripping pulse time delay, from 0.1 to
5s, (step 10ms).
100 ms

t Close Pulse Displays and sets the closing pulse time delay, from 0.1 to
5s (step 10ms).
100 ms

2.8.15 Submenu SOTF (Switch on to fault) (P126 & P127 only)

With the Switch On To Fault (SOTF) submenu, it is possible to shorten the time to trip when
for example the relay has detected a fault that is still present on a feeder after energising.
Using this menu, when SOTF function is activated, it is possible to choose the origin of the
circuit breaker closing command which will start the SOTF feature. One or several origins
can be selected.

The SOTF function can be set using “Automatic Ctrl” menu, “Trip Command”, “Output relays”
and “Inputs”submenus.

AUTOMAT. CTRL

SOTF Heading of Switch On To Fault (SOTF) sub menu.

Sotf? Selection of the Sotf function.

No Setting choice: Yes, No.
If Yes is selected, the following menu is displayed,
If No is selected, the Sotf sub menu is inactive.
t Sotf Displays the delay timer setting (tSotf) for SOTF function,
0.10 s from 0 to 500 ms (step 10 ms).

I>>? Enables/disables the possibility to start the SOTF by I>>.

No Setting choice: Yes, No

I>>>? Enables/disables the possibility to start the SOTF by I>>>.

No Setting choice: Yes, No

Ctrl close input Enables/disables the possibility to start the SOTF function
Yes/No by the dedicated logic input “Ctr Close”. This “Ctr Close”
input should be assigned to input 1, 2, 3 or 4 using
“Automat. ctrl/Inputs” menu.
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SOTF Input Enables/disables the possibility to start the SOTF function

Yes/No by the dedicated logic input “SOTF”. This “SOTF” input
should be assigned to input 1, 2, 3 or 4 using “Automat.
ctrl/Inputs” menu.
HMI closing order: Enables/disables the possibility to start the SOTF function
Yes/No by a user’s manual closing order, using interface.

[79] closing Enables/disables the possibility to start the SOTF function

Yes/No by an internal autoreclose order.

Front comm. order Enables/disables the possibility to start the SOTF function
Yes/No by a front port communication order.

Rear comm. order Enables/disables the possibility to start the SOTF function
Yes/No with an order sent to the rear port communication.

Rear2 comm. order When existing, enables/disables the possibility to start the
Yes/No SOTF function with an order sent to the second rear port
communication.

2.8.16 Submenu Logic Equations (P126 & P127 only)

With the Logic Equations submenu, it is possible to form up to 8 complex Boolean functions
using NOT, AND and OR operators (in order of priority). Up to 16 operands can be used in
any single equation. The following logic signals are available for mapping to an equation:

TEXT Information
None No link/assignment.
I>, I>> or I>>> Instantaneous 1st, 2nd or 3rd phase overcurrent threshold.
tI>, tI>> or tI>>> Time delayed 1st, 2nd or 3rd phase overcurrent threshold.
Ie>, Ie>> or Ie>>> Instantaneous 1st, 2nd or 3rd earth overcurrent threshold.
tIe>, tIe>> or tIe>>> Time delayed 1st, 2nd or 3rd earth overcurrent threshold.
Pe> or Pe>> 1st and 2nd earth wattmetric alarm threshold.
tPe> or tPe>> Time delayed 1st or 2nd earth wattmetric trip threshold.
I2>, I2>> or I2>>> Instantaneous 1st, 2nd or 3rd phase negative sequence
threshold.
tI2>, tI2>> or tI2>>> Time delayed negative phase sequence (1st; 2nd or 3rd
threshold).
θ Alarm Thermal alarm output signal.
θ Trip Trip on Thermal overload.
I< Instantaneous undercurrent threshold.
tI< Time delayed undercurrent.
U> or U>> Instantaneous 1st or 2nd overvoltage threshold (P127).
tU> or tU>> Time delayed 1st or 2nd overvoltage threshold (P127).
U< or U<< Instantaneous 1st or 2nd undervoltage threshold (P127).
tU< or tU<< Time delayed 1st or 2nd undervoltage threshold (P127).
Ue>>>> Instantaneous threshold for residual overvoltage.
tUe>>>> Time delayed trip threshold for residual overvoltage.
tBC Time delayed broken conductor.
79 Trip Autoreclose final trip.
Input1 to Input 7: Opto input 1 to input 7 status.
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MiCOM P125/P126 & P127 Page 87/94

TEXT Information
Input8 to Input C Opto input 8 to input C status (optional configuration).
t Aux 1 to tAux 7 Copy of the status of the Logic Input delayed by tAux1 (…
tAux7) time.
t Aux 8 to tAux C Copy of the status of the Logic Input delayed by tAux8 to tAux
C time (optional configuration).
P> or P>> Instaneous 1st or 2nd active overpower trip threshold (P127).
tP> or tP>> Time delayed 1st or 2nd active overpower trip threshold (P127).
P< or P<< Instaneous 1st or 2nd active underpower trip threshold (P127).
tP< or tP<< Time delayed 1st or 2nd active underpower trip threshold
(P127).
Q> or Q>> Instaneous 1st or 2nd reactive overpower trip threshold (P127).
tQ> or tQ>> Time delayed 1st or 2nd reactive overpower trip threshold (P127).
Q< or Q<< Instaneous 1st or 2nd reactive underpower trip threshold (P127).
tQ< or tQ<< Time delayed 1st or 2nd reactive underpower trip threshold
(P127).
F1 to F6 Instantaneous first to sixth frequency trip threshold (P127).
tF1 to tF6 Time delayed first to sixth frequency trip threshold (P127).
dF/dt1 to dF/dt6 1st to 6th rates of change of frequency.
VTS Instantaneous Voltage Transformer Supervision output signal
(P127).
CTS Instantaneous Current Transformer Supervision signal (P127).
Ie>>>> Derived earth overcurrent threshold.
tIe>>>> Time delayed threshold of derived earth overcurrent
threshold.
79 i. Lock Autoreclose lock activated by the internal process of the
autoreclose (Internal Blocking).
79 e. Lock Autoreclose lock activated by the input “block 79” (External
Blocking).
tEQU. A to tEQU. H Results of equations A to H.
CB Fail Circuit Breaker failure.

Example settings for Equation A

AUTOMAT. CTRL

Logic Equations

Equation A Heading of Equation A submenu.

Equ.A Toperat. The time of operation setting is used to set the minimum
0.00s time of truth of the selected conditions before validating the
truth of the logic operation.
Setting choice: from 0 to 600s, step 10ms
Equ.A Treset. The reset time sets a minimum time before the logic
0.00s operation is not true when at least one condition is not true.
Setting choice: from 0 to 600s, step 10ms
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The following submenu are identical from A.01 to A.15.

Equation A.00 Boolean function: Setting choice: “=”, “= Not”
= Null

Equation A.00 Logic signal: Setting Choice: Null and logic signals (see
= None table).

2.8.17 Submenu Comm. Order delay (P127 only)

AUTOMAT. CTRL

Comm. Order Heading of remote communication order sub menu.

delay

tOrder Comm 1 Sets the duration for the reception of the remote
0.1s “communication order 1” signal.
Setting range from 0s to 600s, in steps of 50ms.
tOrder Comm 2 0.1s As above for communication orders 2, 3 and 4.
tOrder Comm 3 0.1s
tOrder Comm 4 0.1s
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MiCOM P125/P126 & P127 Page 89/94

2.9 RECORDS menu

With the RECORDS menu stored data, events, disturbances and monitoring signals from
various submenus can be displayed and read.
The different submenus are:

 RECORDS   

       
 CB (1)  Fault Record  Instantane-  Disturb
Monitoring   ous  Record

   
 Time Peak (1)  Rolling (1)  
 Value  Demand
(1) P126 and P127 only
2.9.1 Submenu CB Monitoring (P126 & P127 only)
With the CB Monitoring submenu it is possible to read and clear counter values associated
with the circuit breaker.

RECORD Heading the RECORD menu.

CB Monitoring Heading the CB Monitoring submenu.

CB Opening Time Displays the circuit breaker opening time.

0.05 s

CB Closing Time Displays the circuit breaker closing time.

0.05 s

CB Operations Displays the number of opening commands executed by the

RST = [C] 0 circuit breaker. To clear these values, press .

Σ Amps (n) Displays the summation of the current (in Amps or square
RST = [C] Amps) interrupted by the CB. Stored current values for all 3
phases are cleared together. To clear these values, press
.

Σ Amps (n) IA Displays the summation value of the current (in Amps or
2 E04 square Amps) for phase A interrupted by the circuit breaker.

Σ Amps (n) IB As above for phase B.

2 E04

Σ Amps (n) IC As above for phase C.

2 E04
P12y/EN FT/E95 User Guide

Page 90/94 MiCOM P125/P126 & P127

2.9.1.1 Submenu Fault Record

The Fault Record submenu makes it possible to read up to 25 stored fault records, that
occurred when programmed thresholds were exceeded.
The fault records are generated by the operation of trip relay RL1.
NOTE: All measurement magnitude values refer to the transformer primary
side.

RECORD

Fault Record Heading of Fault Record submenu.

Record Number Selection one of the 25 Fault Record to be displayed

5 (selection = 5).

Fault Time Displays the time when the fault was recorded. The format
13:05:23 of the time is hh:mm:ss.
In this example the fault was recorded at 1:05:23 pm.
Fault Date Displays the date when the fault was recorded. The format
12/11/01 of the Date is DD/MM/YY.
In this example, the fault was recorded on November 12th
2001.
Active Set Group Displays the active setting group (1 or 2).
1

Faulted Phase Displays the phase, where a fault occurred, for the chosen
PHASE A fault record. (NONE, PHASE A, B, C, EARTH).

Threshold Displays the origin of the fault that generated the trip order.
-----

Magnitude Displays the magnitude value of the fault: Voltage, current,

1200 A earth power. The value is based on the amplitude at 50 or
60 Hz.
IA Magnitude Displays the magnitude value of the phase A current at the
1200 A time of the fault.

IB Magnitude As above for phase B.

1200 A

IC Magnitude As above for phase C.

1280 A

IN Magnitude As above for earth current.

103 A

VAB Magnitude Displays the magnitude value of the phase A to phase B

10 KV voltage at the time of the fault (P127 only).

VBC Magnitude Displays the magnitude value of the phase B to phase C

10 KV voltage at the time of the fault (P127 only).

VCA Magnitude Displays the magnitude value of the phase C to phase A

10 KV voltage at the time of the fault (P127 only).

VN Magnitude Displays the magnitude value of the residual voltage at the

100 V time of the fault.

IA^VBC Angle Displays the angle between phase A current and phase B to
----° phase C voltage at the time of the fault (P127 only).
The indication is ----° if the angle cannot be measured.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 91/94

IB^VCA Angle Displays the angle between phase B current and phase C
----° to phase A voltage at the time of the fault (P127 only).
The indication is ----° if the angle cannot be measured.
IC^VAB Angle Displays the angle between phase C current and phase A
----° to phase B voltage at the time of the fault. (P127 only)
The indication is ----° if the angle cannot be measured.
IN^VN Angle Displays the angle between earth current and voltage at the
----° time of the fault.
The indication is ----° if the angle cannot be measured.

2.9.1.2 Submenu Instantaneous

The instantaneous sub-menu makes possible to read the various parameters for each of the
last five starting information.
NOTE: All measurement magnitude values refer to the transformer primary
side.

RECORD

Instantaneous Heading of the Instantaneous sub-menu.

Number Selection of the Istantaneous Record number 5 to be

5 displayed (selection: 1 to 5).

Hour Displays the time when the istantaneous record was

13:05:23 recorded. The format of the time is hh:mm:ss.
In this example the fault was recorded at 1:05:23 pm.
Date Displays the date when the instantaneous record was
12/11/01 recorded. The format of the Date is DD/MM/YY.
In this example, the fault was recorded on November 12th
2001.
Origin Display the origin of the start information.
-----

Lenght Display the length of the start information.

70 ms

Trip Display if a trip has succeeded to the start information.

No

2.9.2 Submenu Disturb Record

The Disturb Record submenu makes it possible to open and read disturbance records. Each
disturbance record consists of analogue and digital data. Up to 9 seconds disturbance
record(s) duration can be stored (5 x 3s, 4 x 3s, 3 x 5s, 2 x 7s or 1 x 9s). The beginning of
the record can be adjusted with a selected pre-time.

RECORD

Disturb Record Heading of Disturb Record submenu.

Records number ? Setting choices: 1, 2, 3, 4 or 5.

5 Sets the disturbance record length. This setting choice
adjusts the number of records according to the record
length. Setting choice allows 5 records of 3 seconds, 4
records of 3 seconds, 3 records of 5 seconds, 2 records of
7 seconds or 1 record of 9 seconds.
P12y/EN FT/E95 User Guide

Page 92/94 MiCOM P125/P126 & P127

Pre-Time Selection of the disturbance record pre-time from 100 ms to

0.1 s 2.9s, 4.9s, 6.9s or 8.9s (record length minus 0.1s) in steps
of 100 ms.
The pre-time adjusts the beginning of the disturbance
record: In this example, the record starts 100ms before the
disturbance. Its length is fixed.
Disturb rec Trig Selection of start criteria for the disturbance recording
ON INST. function. Select between ON INST. (start on instantaneous
thresholds) and ON TRIP (start on trip conditions) by
pressing  or . Press  to confirm choice.

2.9.2.1 Submenu Time Peak Value (P126 & P127 only)

The Time Peak Value submenu makes it possible to set parameters associated to this
function. (Peak and average values displayed in the Measurements menu).

RECORD

Time Peak Value Heading of Time Peak Value submenu.

Time Window Selection of the time window during which peak and
5 mn average values are stored. Selet choice: 5mn, 10mn,
15mn, 30mn, or 60mn.

2.9.2.2 Submenu Rolling Demand (P126 & P127)

The Rolling Demand sub-menu makes possible to set the rolling sub-period and the number
of the sub-period for the calculation of the 3 phase Rolling Average and peak demand
values, available in the Measurement menu.

RECORD

Rolling Demand Heading of the Rolling Demand sub-menu.

Sub Period Set the window of time of the subperiod used to calculate
1 mn rolling average values, from 1mn to 60mn (step 1mn).

Num of Sub Per Select the number of sub-period used for the calculation of
1 the average of these average values.
User Guide P12y/EN FT/E95

MiCOM P125/P126 & P127 Page 93/94

3. WIRING
The MiCOM P125, P126 & P127 relays have the same terminal layout for common
elements. The wiring diagram for each model is provided in Appendix 1 of the Technical
Guide.
3.1 Auxiliary Power Supply
The auxiliary power supply for the MiCOM P125, P126 & P127 relays can be either direct
current with a voltage range of 24-60 VDC, 48-250 VDC, 130-250 VDC, or alternative current
with a voltage of 48-250 VAC/ 50-60 Hz. The voltage range (Ua) is specified on the adhesive
paper label under the top hinged cover on the front of the relay.
The auxiliary power supply must only be connected to terminals 33 and 34.
3.2 Current Measurement Inputs
The MiCOM P125, P126 & P127 relays have up to eight current inputs (2 times 4 earth and
phase current inputs).
The nominal current value of the measuring inputs is either 1 Amp or 5 Amp (refer to wiring
diagram). For the same relay, the user can mix the 1 and 5 Amp inputs between phases and
earth.
NOTE: All phase inputs must have the same rating (1 or 5 Amps).
3.3 Digital Inputs
The number of logic inputs depends on the relay model. The relays have programmable
opto-isolated logic inputs, which may be assigned to any available label or function.
Digital inputs for each relay model:

Model P125 P126 P127

Digital Inputs 4 7 7 / 12

The voltage range of the inputs is universal (from 24-240Vac/250 Vdc).

3.4 Output Relays
The number of logic outputs depends on the relay model. The relays have configurable logic
outputs, which may be assigned to any available function.
The normally closed (NC) contact of the Watchdog (RL0) is not configurable. The other
contacts are configurable to functions available in the relay. A basic output matrix is included
in the relay. Some logic outputs have changeover contacts. RL1 and RL2 can be configured
to be fail safe or not.
Logic outputs for each relay model:

Model P125 P126 P127

Logic outputs 6 8 8

The first logic output (RL0) is dedicated to indicate a relay failure (Watchdog, WD) and is not
part of this table.
3.5 Communication
3.5.1 RS485 Rear Communication Port
All MiCOM relays have one RS485 rear communication port by default. The terminals 29-30-
31-32 are dedicated to the RS485 communication port. An optional RS485 port is available
on P127.
See wiring diagrams in chapter P12y/EN CO of the Technical Guide.
P12y/EN FT/E95 User Guide

Page 94/94 MiCOM P125/P126 & P127

3.5.2 RS232 Front Communication Port

MiCOM P125, P126 & P127 relays provide the user with a RS232 communication port on
the front panel. This link is dedicated to MiCOM setting software.
The cable between the relays and the PC is a standard RS 232 shielded cable.
The relay requires a RS232 cable with a 9-pin male connector.
The wiring of the RS232 cable must be as follows:

RS232 PC PORT MiCOM P125/6/7 end

9 pin male connector 9 pin female connector

P0073ENa

FRONT PANEL PORT COMMUNICATION RS232 CABLE WIRING

A USB/RS232 cable can also be used to communicate to the relay.
Menu Content Tables P12y/EN HI/E95

MiCOM P125/P126 & P127

MENU CONTENT TABLES

Menu Content Tables P12y/EN HI/E95

MiCOM P125/P126 & P127 Page 1/24

CONTENTS

1. MiCOM P125 – V12 SOFTWARE 3

2. MiCOM P126 – V12 SOFTWARE 6

3. MiCOM P127 – V13 SOFTWARE 13

P12y/EN HI/E95 Menu Content Tables

Page 2/24 MiCOM P125/P126 & P127

BLANK PAGE
 1.
DEFAULT DISPLAY
IA = 1245 A

OP PARAMETERS ORDERS CONFIGURATION

Password Open Order General Inputs Output

Transfo ratio LED 5/6/7/8 Group Select Alarms
**** No options configuration relays
Menu Content Tables

Language Close Order Earth text E/Gnd VT primary Led Inputs :4321 Fail 654321 Change group Inst. Self-reset
ENGLISH No N 5A Ie> ↑↑↑↑ safe re.000000 Input No
tIe> Menu
MiCOM P125/P126 & P127

Ie>>
Description Dist rec start E/Gnd VT sec Voltage input Maintenance Mode Setting group Reset Led on
tIe>>
P125-0 No 5A DC No 1 Fault No
Ie>>>
tIe>>> Input
Yes
Pe/IeCos>
Reference E/Gnd primary Relays 65W4321 INH Alarm tAux1?
tPe/IeCos>
ALST 0.10 kV Pe/IeCos>> CMD 0000000 No
tPe/IeCos>> No
MiCOM P125 – V12 SOFTWARE

Ue>>>>
Software version E/Gnd VT sec INH Alarm tAux2?
tUe>>>>
12.A 100.0 V No
Input1/2/3/4
tAux1/2/3/4
Frequency INH Alarm tAux3?
50 Hz Yes

Active Group = INH Alarm tAux4?

1 Yes

Input 4321 Alarm.Inh. Eq A?

Status 0101 Alarm.Inh. Eq H?

Relay 654321
Status 001011 Date

Date
11/06/07 Format Date
Private

Time
14 : 15 : 34
P12y/EN HI/E95

Page 3/24
 DEFAULT DISPLAY
IA = 1245 A
Page 4/24

MEASUREMENTS COMMUNICATION PROTECTION G1/G2

Frequency Communication ? [32N] Earth [59N] residual

P12y/EN HI/E95

Yes [67N] E/Gnd

50.00 Hz Wattmetric Over Voltage
Yes
IN Ie> ? Mode
Baud rate Ue>>>> ?
3.15 A No Pe
19200 bd 260.0 V
Dir Yes
Pe IeCos Yes
IN-fn
RST=[C] 0.00A Parity Ie> 10.00 In Ie> 10.00 In Pe> IeCos>
No No Ue>>>> 5.0 V
None Ue> 1.0V Delay type DMT tUe>>>> 0.00s
Ie> Torque 0° tIe> 0.00s Yes Yes
UN Ie> Trip ± 50.0% tReset 0.04s
3.15V Delay type DMT Pe> 160.0x1W IeCos> 8.000Ien No
Data Bits
tIe> 0.00s Delay Type DMT Delay Type DMT
8
tReset 0.04s tPe> 0.00s tIeCos> 0.00s
Pe tReset 0.04s tReset 0.04s
0.00 W
Stop Bits No
No No
1
IeCos Ie>> ? Pe>> tIeCos>>
0.00A No No No
Relay address Yes
Dir
1 Yes Yes
IN^VN Angle Ie>> 10.00 In Ie>> 10.00 In
Ie>> Torque 0° Pe>> 160.0x1W IeCos>> 8.000Ien
0.0° No Delay type DMT
Ie>> Trip tPe>> 0.00s tIeCos>> 0.00s
tIe>> 0.00s tReset 0.04s°
Delay type DMT tReset 0.04s
tIe>> 0.00s
No No
No Pe/IeCos Angle Pe/IeCos Angle
0° 0°
Ie>>> ?
No
Dir Yes / Peak
Ie>>> 10.00 In
Ie>>> 10.00 In tIe>>> 0.00s
Ue> 260.0V tReset 0.04s
Ie> Torque 0°
Ie> Trip ± 10.0%
tIe>>> 0.00s
No tReset 0.04s
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL RECORDS

Trip Commands Latch Relays Blocking Loqic Output Relays Inputs Fault Record Instantaneous

Block tIe> No Trip 65432 Record Number Number

Menu Content Tables

Trip tIe> No Latch :654321 Inputs 1/2/3/4

000000 Block tIe>> No 00100 25 5
Trip tIe>> No
Trip tIe>>> No Block tIe>>> No Ie >
tle > Fault Time Hour
MiCOM P125/P126 & P127

Unlatch
Ie >>
Blk Log 12:05:23:42 13:07:15:53
Trip tPe/IeCos> Block tPe/IeCos> tle >>
Aux 1
No No Ie >>>
Aux 2
Trip tPe/IeCos >> Block tPe/IeCos >> tle >>> Fault Date Date
Aux 3
No No Pe/IeCos> 09/01/01 09/01/01
Aux 4
tPe/IeCos>
Strt Dist
Pe/IeCos>>
Changeset Active Set Group Origin
Block tUe>>>> tPe/IeCos>>
Trip tUe>>>> Maint. M. 2 Ie>
No Ue>>>>
No Local
tUe>>>>
Synchro
tAux1 Faulted Phase Length
Led Reset
tAux2
Block tAux1 No Ctrl Trip EARTH 57 ms
Trip tAux1 No tAux3
Block tAux2 No Ctrl Close
Trip tAux2 No tAux4
Trip tAux3 No Block tAux3 No Control trip Threshold Trip
Trip tAux4 No Block tAux4 No Control Close I> No
Active Group Aux Time
Input 1
Input 2 Magnitude
Ctrl Trip 1200 A
Input 3 Disturbance Record
No
Input 4 Aux1 Time
tAux1 0.00 s
IN Magnitude
tAux2 0.00 s Records number
tAux3 0.00 s 103 A
5
tAux4 0.00 s
VN Magnitude
0.00V Pre-Time
1.3 s

IN^VN Angle
0° Disturb Rec Trig
ON INST.
P12y/EN HI/E95

Page 5/24
 2.
DEFAULT DISPLAY
IA = 1245 A
Page 6/24

OP PARAMETERS ORDERS CONFIGURATION

Password Open Order Inputs Output

P12y/EN HI/E95

General options Transfo ratio LED 5 / 6 / 7 / 8 Group Select

**** No configuration relays

Language Close Order Phase rotation Line CT primary Inputs :7654321 Fail 87654321 Change group
Led
ENGLISH No A-B-C 5A ↑↑↑↑↑↑↑ safe re.00000000 Input
I>
tI> Menu
I>> Voltage input
Description Dist rec start Default Displays Line CT sec tI>> Maintenance Mode Setting group
DC
P126-2 No RMS IA IB IC IN 5A I>>> No 1
tI>>> Input
Yes
tIA>
Reference Phases/Earth Text E/Gnd CT primary tIB> Relays8765W4321
ALST L1 L2 L3 N 5A No CMD 000000000
tIC>
Ie>
tIe>
MiCOM P126 – V12 SOFTWARE

Software version E/Gnd CT sec Ie>>

11.x 5A
tIe>>
Ie>>>
tIe>>>
Frequency Line VT primary
Pe/IeCos>
50 Hz 0.10 kV
tPe/IeCos>
Pe/IeCos>>
tPe/IeCos>>
Active Group =
I2>
1
tI2>
I2>>
tI2>>
Input 754321
I2>>>
Status 000101
tI2>>>
Therm Trip Input1 /2 /3 /4
Relay 87654321 I< Input5 /6 /7
Status 00001011 tI< 79 Run
Ue>>>> 79Int Locked
tUe>>>> 79Ext Locked
Date Brkn. Cond tAux1 /2/3/4/5/6/7
11/06/07 CB Fail t SOTF

Time
14 : 15 : 34 Software version 12.A
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

CONFIGURATION MEASUREMENTS COMMUNICATION

Frequency IN^VN Angle Average IB Rms Communication ?

Alarms Date 50.00 Hz 0.0° 600.00A Yes
Yes
IA^IB Angle Average IC Rms
Menu Content Tables

Inst. Self-reset Format Date IA Baud rate

600.00 A 0.0° 600.00A
No Private 19200 bd

IA^IC Angle MAX SUBPERIOD

MiCOM P125/P126 & P127

IB
Reset Led on 600.00 A 0.0° RST=[C] 0% Parity
Fault No None

IC IN-fn MAX SUBPERIOD

INH Alarm Ctrl_Trip? 600.00 A RST=[C] 0.00A IA Rms 600.00A Data Bits
No 8
IN THERMAL STATUS MAX SUBPERIOD
INH Alarm tI<? 3.15 A RST=[C] 0% IB Rms 600.00A
Stop Bits
No 1
I1 MAX & AVERAGE MAX SUBPERIOD Total recloses
600.00 A RCT=[C] IC Rms 600.00A 0
INH Alarm[79]DI.Lock? Relay address
No No 1
I2 Max IA Rms ROLLING AVERAGE Cycle 1 recloses
0.00 A 600.00A RST=[C] 0
INH Alarm tAux1?
No
ROLLING AVERAGE Cycle 2 recloses
RATIO I2 / I1 = Max IA Rms
IA Rms 600.00A 0
0% 600.00A
INH Alarm tAux2?
No ROLLING AVERAGE Cycle 3 recloses
UN Max IB Rms
600.00A IB Rms 600.00A 0
3.15V
INH Alarm tAux3?
Yes ROLLING AVERAGE Cycle 4 recloses
Pe Max IC Rms
IC Rms 600.00A 0
0.00 W 600.00A
INH Alarm tAux4?
Average IA Rms Reclose Stats Total Trip &
Yes IeCos
600.00A RST=[C] Lockout 0
0.00A

Alarm.Inh. Eq A?
Alarm.Inh. Eq H?
P12y/EN HI/E95

Page 7/24
 DEFAULT DISPLAY
IA = 1245 A

PROTECTION G1/G2
Page 8/24

[32N] Earth [46] Neg Seq OC

[67] Phase OC [67N] E/Gnd
Wattmetric
P12y/EN HI/E95

I> ? Ie> ? Mode I2> ?

No No Pe No
Yes Dir Pe IeCos Yes
I> 10.00 In Ie> 10.00 In Pe> IeCos> I2> 25.00 In
Delay type DMT If Dir: No No Delay type DMT
tI> (1) 0.00s Ue> 1.0V (1)
Yes Yes tI2> 0.00 s
Ie> Torque 0°
No Ie> Trip ± 50.0% Pe> 160.0x1W IeCos> 8.000Ien No
I>> ? If Dir or Yes: Delay Type DMT Delay Type DMT
Delay type DMT (1) I2>> ?
No tPe> 0.00s tIeCos>(1) 0.00s
tIe>(1) 0.00s (1) (1) No
tReset 0.04s tReset 0.04s
Yes tReset(1) 0.04s Yes
No No No
I>> 40.00 In I2>> 40.00 In
Pe>> tIeCos>>
Delay type DMT Ie>> ? tI2>> 0.00 s
No No
tI>>(1) 0.00s No
Dir No Yes
No Yes Yes
I2>>> ?
Ie>> 10.00 In Pe>> 160.0x1W IeCos>> 8.000Ien
I>>> ? No
If Dir: tPe>> 0.00s tIeCos>> 0.00s
No
Ie>> Torque 0° tReset 0.04s tReset 0.04s° Yes
Yes Ie>> Trip
If Dir or Yes No No I2>>> 40.00 In
I>>> 40.00 In Delay type DMT tI2>>> 0.00 s
Pe/IeCos Angle Pe/IeCos Angle
Delay type DMT tIe>>(1) 0.00s 0° 0°
(1) No
tI>>> 0.00s (1) If Delay Type = DMT
No No Otherwise, the following
Ie>>> ?
No menus are displayed

Dir : Yes / Peak Delay Type ≠ DMT

Ie>>> 10.00 In
If Dir: IEEE, IEC,
Ue> 260.0V RI RECT or CO
Ie> Torque 0° K 0.025 TMS 0.025
Ie> Trip ± 10.0% tReset 0.00s Reset Delay TypeDMT
If Dir or Yes: If reset delay type=IDMT:
No tIe>>> 0.00s Rtms 0.025
tReset 0.04s tReset 0.00s
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

PROTECTION G1/G2

[59N] residual
[49] Therm OL [37] Under current [79] Autoreclose
Over Voltage
Menu Content Tables

Therm OL I< ? Ue>>>> ? Autoreclose Dead Time

No No 260.0 V No tI> 0.05 s
Yes Yes OR / AND Yes Yes tI>> 0.05 s
MiCOM P125/P126 & P127

tI>>> 0.05 s
Iθ> 0.10 In I< 0.10 In Ue>>>> 5.0 V Ext CB Fail ? tIe> 0.05 s
Te 1 mn tI< 0.00s tUe>>>> 0.00s No tIe>> 0.05 s
K 1.05 tIe>>> 0.05 s
Yes
θTrip 100 %
No Ext CB Fail Time
No I< Inhibited on
52 a No 1.00 s Reclaim Time
θ Alarm tR 5.00 s
No No No
OR / AND
Yes Ext Block
Yes Inhib Time Time
θ Alarm tR 5.00 s
90%
No Rolling demand ?
No Phase Cycles
Yes 4

Max cycles nb
10 E/Gnd Cycles
4

Time period
10 mn Cycles 4321
tI> 1111
No tI>> 1111
tI>>> 1111
Dead Time
tIe> 1111
TD1 5.00 s
tIe>> 1111
TD2 5.00 s
tIe>>> 1111
TD3 5.00 s
tPe/IeCos> 1111
TD4 5.00 s
tPe/IeCoss>>1111
No tAux1 1111
tAux2 1111
tAux3 1111
tAux4 1111
P12y/EN HI/E95

Page 9/24
 DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL
Page 10/24

Trip Commands Latch Relays Blocking Loqic Logic Select 1/2 Output Relays
P12y/EN HI/E95

Trip tI> No Latch :87654321 Block tI> No Sel1 tI >> Trip 8765432
Trip tI>> No 00000000 Block tI>> No No 1000100 Trip 8765432
Trip tI>>> No Block tI>>> No I> 1000100
tl > CB Alarm
Sel 1 tI >>> 52 Fail
I >>
Block tIe> No No CB Fail
Trip tIe> No tl >>
Block tIe>> No CB Close
Trip tIe>> No I >>>
Block tIe>>> No tAux1
Trip tIe>>> No Sel1 tle >> tl >>>
No tIA> tAux2
Block tPe/IeCos> tIB> tAux3
Trip tPe/IeCos> No tIC tAux4
No Block tPe/IeCos >> Sel 1 tle >>> Ie > tAux5
Trip tPe/IeCos >> No No tle > tAux6
No Ie >> tAux7
tle >> 79 Run
Block tI2> No t Sel 1 Ie >>> 79 Trip
Trip tI2> No Block tI2>> No 150 ms tle >>> 79 int. Lock.
Trip tI2>> No Trip tAux1 No Block tI2>>> No Pe/IeCos> 79 ext. Lock
Trip tI2>>> No Trip tAux2 No
tPe/IeCos> SOFT
Trip tAux3 No
Pe/IeCos>> Control trip
Trip tAux4 No Block Thermal θ No
tPe/IeCos>> Control Close
Trip tAux5 No Block tI< No
Trip Thermal θ No I2> Active Group
Trip tAux6 No
Trip tI< No tI2> Input 1
Trip tAux7 No
I2>> Input 2
Block tUe>>>>
tI2>> Input 3
No
Trip SOFT No I2>>> Input 4
Trip tUe>>>> tI2>>> Input 5
Ctrl Trip No
No Therm Alarm Input 6
Block TBrk.Cond Therm Trip Input 7
Trip EQUATION A ? No I< Equ. A
Trip Brkn.Cond No tI< Equ. B
No … Ue>>>> Equ. C
Trip EQUATION H ? Block tAux1 No tUe>>>> Equ. D
No Block tAux2 No Brkn Cond Equ. E
Block tAux3 No Equ. F
Block tAux4 No Equ. G
Block tAux5 No Equ. H
Block tAux6 No
Block tAux7 No
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL

Sotf Logic Equations

Inputs Broken Conductor Cold Load PU CB Fail CB Supervision

Inputs 1/2/3/4/5/ Brkn.Cond ? Cold load PU ? CB Fail ? TC Supervision ? Sotf Equation

Aux Time
6/7 Yes No No No No A/B/C/D/E/F/G/H
Menu Content Tables

Yes Yes Yes

Brkn.Cond Time I < BF t trip circuit tSotf
Unlatch Aux1 Time Input? Equ. A Toperat.
tBC 32 s 0.1 In tSUP 3s 100 ms
Blk Log 1 Yes
MiCOM P125/P126 & P127

tAux1 0.00 s = 0.00s

Blk Log 2 tAux2 0.00 s No
52 a tAux3 0.00 s CB Fail Time CB Open S’vision ? I >>
52 b Ratio I 2/I 1 tBF 0.10 s No Yes Equ.A Treset
tAux4 0.00 s Auto?
CB FLT 20 % Yes = 0.00s
tAux5 0.00 s No
Aux 1 tAux6 0.00 s Block I > ? CB Open Time I >>>
Aux 2 No
tAux7 0.00 s No 150 ms Yes 1/2 A.00
Aux 3 Cold Load PU OR NONE
Aux 4 tl> ? Yes No
Bloc Ie > ? CB Close S’vision ? Ctrl close input AND NOT NONE
Aux 5 tI>> ? Yes
Yes Yes No AND NONE
Aux 6 tI>>> ? Yes OR NOT None
Aux 7 tIe> ? Yes
Strt Dist tIe>> ? Yes CB Close Time SOTF Input
Cold L PU tIe>>> ? Yes No 150
Yes ms Yes 2/2 A.00
Log Sel 1 tIe>>>> ? Yes OR NONE
Log Sel 2 tI2> ? Yes No
Changeset CB Open Alarm ? HMI closing order
tI2>> ? No Yes No
Block 79 tI2>>> ? Yes
θ Reset Yes
tTherm ? Yes
Trip Circ CB Open NB [79] closing
Start tBF 1500 Yes
Maint. M.
SOTF Cold Load PU ΣAmps (n) ? Front comm order
Local Level 120 % No Yes
Synchro
Led Reset Yes
Ctrl Trip Cold Load PU ΣAmps (n) Rear comm order
Ctrl Close tCL 2s 3 E6 Yes
No
No n
2

No tOpen Pulse
300ms
P12y/EN HI/E95

Page 11/24
 DEFAULT DISPLAY
IA = 1245 A

RECORDS
Page 12/24
P12y/EN HI/E95

CB Monitoring Fault Record Instantaneous Disturbance Record Time Peak Value Rolling Demand

CB Opening Time Record Number Number Records number Time Window Sub Period
83 ms 25 5 5 5 mn 1mn

CB Closing Time Fault Time Hour Pre-Time Num of Sub Per

100 ms 12:05:23:42 13:07:15:53 0.1 s 1

CB Operations Fault Date Date Disturb Rec Trig

RST = [C] 1312 09/01/01 09/01/01 ON INST.

ΣAmps (n) Active Set Group Origin

RST= [C] 2 Ie>

ΣAmps (n) IA Faulted Phase Length

5 E6 EARTH 57 ms

ΣAmps (n) IB Threshold Trip

5 E6 I> No

ΣAmps (n) IC Magnitude

5 E6 1200 A

IA Magnitude IN Magnitude
1200 A 103 A

IB Magnitude VN Magnitude
500 A 0.00V

IC Magnitude IN^VN Angle

480 A 0°
MiCOM P125/P126 & P127
Menu Content Tables
 3.
DEFAULT DISPLAY
IA = 1245 A

CONFIGURATION (cont
OP PARAMETERS ORDERS CONFIGURATION

Password Record Reset General options Transfo. ratio

**** No
Yes
Menu Content Tables

Language Confirmation ? VT Connection Line CT primary

ENGLISH No 2Vpp+Vr 5A
(2)
No
MiCOM P125/P126 & P127

Description VT Protection Ibm Tdd denom. Line CT sec

Open Order 1A
P127-1 Protect P-N 5A
No
(2)

Reference Phase rotation Icm Tdd denom. E/Gnd CT primary

ALST Close Order A-B-C 1A 5A
No
(2) (2)
Software version Input 754321 CTm1 phase ? Prot. Freq. Block E/Gnd CT sec
MiCOM P127 – V13 SOFTWARE

Status 000101 Dist rec start 5V 5A

13.x none
No
(2)
Frequency Input CBA98 CTm2 phase ? dF/dt Cycles.nb Line VT primary
50 Hz Status 00000 none 5 0.10 kV
(2) (2)
Active Group = Relay 87654321 Quadrant conv. ? dF/dt Validat.nb= Line VT sec
1 Status 00001011 Quadrant 1 4 100.0 kV
(1)
Date Default Displays Inh.Block dF/dt E/Gnd VT primary
11/06/07 RMS IA IB IC IN >20 Hz/s No 0.10 kV

(2) (1)
Time Phases/Earth Text Time synchro E/Gnd VT sec
14 : 15 : 34 L1 L2 L3 N IRIG B 100.0 kV
(2)
Iam Tdd denom. IRIG B Line CTm primary
1A Modulated 1A

Line CTm sec

1A
(1) If the connection mode 2Vpp+Vr or 2Vpn+Vr is selected
(2) Available with P127 optional configuration
P12y/EN HI/E95

Page 13/24
 DEFAULT DISPLAY
IA = 1245 A

CONFIGURATION MEASUREMENTS
CONFIGURATION
Page 14/24

Inputs Output
P12y/EN HI/E95

LED 5/6/7/8 Group Select Alarms

configuration relays

Input :7654321 Fail 87654321 Change Group Inst. Self-reset

Led tPe/IeCos>
↑↑↑↑↑↑↑ safe re. 00000000 Input No
I> Pe/IeCos>>
tI> tPe/IeCos>> Menu
I>> I2>
Input(2) :CBA98 Maintenance Mode Setting group Reset Led on
tI>> tI2>
↑↑↑↑↑ No 1 Fault No
I>>> I2>>
tI>>> tI2>> Yes
tIA> I2>>> Voltage input Relays8765W4321 Target Group
tIB> tI2>>> Inh. Alarm Ctrl_Trip ?
DC CMD 000000000 0
tIC> Therm Trip Inh. Alarm tI< ?
Ie> I< No Input Inh. Alarm tU< ?
tIe> tI< Inh. Alarm tU<< ?
Group if low
Ie>> U> Inh. Alarm tP< ?
F.out level X
tIe>> tU> Inh. Alarm tP<< ?
dF/dt1
Ie>>> U>> Inh. Alarm tQ< ?
dF/dt2
tIe>>> tU>> Group if high. Inh. Alarm tQ<< ?
dF/dt3
Ie>>>> U< level X Inh. Alarm F1 ?
dF/dt4
tIe>>>> tU< …
dF/dt5
P> U<< Inh. Alarm F6 ?
dF/dt6
tP> tU<< Inh. Alarm [79] ext.blk ?
Brkn. Cond
P>> Ue>>>> Inh Alarm tAux1?
CB Fail Group Copy ?
tP>> tUe>>>> …
VTS No
P< F1 Inh Alarm tAux7?
CTS
tP< tF1 Inh Alarm tAux8?(1)
Input 1 /2 /3 /4
P<< F2 copy from …
Input 5 /6 /7
tP<< tF2 G1 Inh Alarm tAuxC?(1)
Input 8 /9 /A /B /C(2)
Q> F3 Inh. Alarm Eq A ?
79 Run
tQ> tF3 …
79i.Blocked
Q>> F4 copy to Inh. Alarm Eq. H ?
79e.Blocked
tQ>> tF4 tAux1 /2 /3 /4/5/6/7 G1
Q< F5 tAux /8 /9 /A /B /C(2)
tQ< tF5 t SOFT
tQ<< F6 Execution ?
tEQU. A / B … /H
Pe/IeCos> tF6 No

(1) Available with P127 optional configuration

MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

CONFIGURATION METERING
MEASUREMENTS

Frequency
50.00 Hz
Menu Content Tables

IA
IB MAX & AVERAGE MAX SUBPERIOD Reclose Stats
IC P
RCT=[C] RST=[C] 0% RST=[C]
MiCOM P125/P126 & P127

IN Q
Ie>>>> S
I1 Cos(Phi)
Max IA Rms MAX SUBPERIOD Total recloses
I2
Max IB Rms IA Rms Cycle 1 recloses
Energy Max IC Rms IB Rms Cycle 2 recloses
RST=[C] Average IA Rms IC Rms Cycle 3 recloses
RATIO I2 / I1 =
Average IB Rms Cycle 4 recloses
0%
3Vpn/ Average IC Rms
2Vpn+Vr 2Vpp+Vr Max UAB Rms
3Ph WHours Fwd Max UBC Rms ROLLING AVERAGE
3Ph WHours Rev Average UAB Rms Total Trip &
UA UAB IA Rms
3Ph VArHours Fwd Average UBC Rms Lockout 0
UB UBC IB Rms
3Ph VArHours Rev
UC UCA IC Rms
3Ph VAHours
UN UN

IN-fn
Pe
RST=[C] 0.00A
IeCos

THERMAL STATUS
IN^VN Angle RST=[C] 0%
IA^IB Angle
IA^IC Angle
3Vpn/
2Vpn+Vr 2Vpp+Vr

IA^UA Angle IN^UAB Angle

IA^UB Angle IA^UBC Angle
IA^UC Angle IA^IUN Angle
P12y/EN HI/E95

Page 15/24
 DEFAULT DISPLAY
IA = 1245 A

(1) COMMUNICATION
MEASUREMENTS
Page 16/24

METERING
P12y/EN HI/E95

Frequency Currents Voltages Powers Energies

Frequency Phase A Phase B Phase C Pm: RST = [C]

50.00Hz VT? Qm:
Sm:
3Vpn AND “Protect P-N”, DPF:
or 2Vpn+Vr AND “Protect P-N”
IAm Ibm ICm Date
THDAm THDBm THDCm DD/MM/YY
TDDAm TDDBm TDDCm Phase A Phase B Phase C
KAm: Iam^Ibm Iam^Icm
IAmh2: KBm: KCm:
… IBmh2 ICmh2: Time
IAmh10: :… … VAm VBm: VCm: HH:MM
IBmh10: ICmh10: THDAm THDBm THDCm
Iam^Va Iam^Vb Iam^Vc
VAmh2: Ibm^Vb Icm^Vc
Export power
… VBmh2: VCmh2: Import power
VAmh10: … …
Lagging VARs
VBmh10: VCmh10: Leading VARs

Phase A Phase B Phase C

3Vpp+Vr
or “Protect P-P”

VABm VBCm: VCAm:

THDAm THDBm THDCm
Iam^Uab Iam^Ubc Iam^Uca
Icm^Uab Ibm^Ubc Ibm^Uca
VABmh2: VBCmh2: VCAmh2:
(1) Available with P127 with measurements CT optional configuration
… … …
VABmh10: VBCmh10: VCAmh10:
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

PROTECTION (prev) PROTECTION (contd)

PROTECTION G1/G2
COMMUNICATION (G3… G8)

HMI ? No No (1)
COMM1 COMM2 [67] Phase OC
No No No
Yes Yes Yes
Relay Address I> ? I>> ?
Menu Content Tables

MODBUS No No
Dir / Yes Dir / Yes
Date Format Baud rate Spont. event. &GI
MiCOM P125/P126 & P127

A11 None I> 10.00 In I>> 10.00 In

Private 19200 bd If Dir: If Dir:
I> Torque 0° I>> Torque 0°
GI select. I> Trip Zone ± 50.0% I>> Trip Zone ± 50.0%
Parity
Basic If Dir or Yes: If Dir or Yes:
None
Delay type DMT Delay type DMT
Measur. upload DMT DMT
Data Bits ASDU 3.4 Yes
8 tI> 0.00s tI>> 0.00s

Measur. upload RI RI
Stop Bits ASDU 9 Yes
1 K 0.025 K 0.025
tReset 0.00s tReset 0.00s
Measur. upload I> I>> I>>> IEEE, IEC,
Relay address Interlock Yes RECT or CO
Other Yes
1
IEEE, IEC, TMS 0.025
RECT or CO Reset Delay TypeDMT
Events + Measur. If reset delay type=IDMT:
Blocking Yes TMS 0.025 Rtms 0.025
Reset Delay TypeDMT tReset 0.00s
If reset delay type=IDMT:
Command Rtms 0.025
Blocking Yes tReset 0.00s
Ie> I>> I>> I>>> ?
Interlock Yes No
nd Command
(1) Available with P127 with 2 port optional
duration 0.1s Dir / Yes
configuration
to COMM2 I>>> 10.00 In
If Dir:
COMM1 only I>> Torque 0°
I>> Trip Zone ± 50.0%
IEC60870-5-103 only
If Dir or Yes:
Delay type DMT
P12y/EN HI/E95

Page 17/24
DEFAULT DISPLAY
IA = 1245 A

METERING PROTECTION (contd)

PROTECTION G1/G2
Page 18/24

(G3… G8)

[32] Directional
P12y/EN HI/E95

[67N] E/Gnd [67N] E/Gnd

Power

No No No
Ie> ? Ie>> ? Ie>>> ? Ie>>>> ? P> ?
No No No No No
Dir / Yes Dir / yes Dir/Yes/Peak Dir / Yes Yes
Ie> 10.00 In Ie>> 10.00 In Ie>>> 10.00 In Ie>>>> 1.00 In P> 10000x1W(1) P< ?
If Dir: If Dir: If Dir: If Dir: tP> 0.00s No
Ue> 1.0V Ue>> Ue> 260.0V Ue>(Ie>>>>) 260.0V
No Yes
Ie> Torque 0° Ie>> Torque 0° Ie> Torque 0° Ie>>>> Torque 0°
Ie> Trip ± 50.0% Ie>> Trip Ie> Trip ± 10.0% Ie>>>> Trip ± 10.0% P>> ? P< 1x1W(2)
If Dir or Yes: If Dir or Yes: If Dir or Yes: If Dir or Yes: No tP< 0.00s
Delay type DMT Delay type DMT Delay Type DMT Delay Type DMT
Yes No
tIe>>> 0.00s
tReset 0.00s DMT P>> 10000x1W(1) P<< ?
DMT DMT
tP>> 0.00s No
tIe> 0.00s tIe>> 0.00s tIe>>>> 0.00s No Yes
tReset 0.00s tReset 0.00s tReset 0.00s
Q> ?
P<< 1x1W(2)
RI RI RI No
tP<< 0.00s
K 0.025 K 0.025 Yes No
K 0.025
tReset 0.00s tReset 0.00s tReset 0.00s Q> 10000x1W (1)
Q< ?
Ie> I>> I>> tQ> 0.00s No
Interlock Yes IEEE, IEC, IEEE, IEC,
No Yes
RECT or CO RECT or CO
IEEE, IEC, Q>> ?
RECT or CO TMS 0.025 TMS 0.025 Q< 1x1W(2)
No
Reset Delay TypeDMT Reset Delay TypeDMT tQ< 0.00s
TMS 0.025 Yes
If reset delay type=IDMT: If reset delay type=IDMT: No
Reset Delay TypeDMT
Rtms 0.025 Rtms 0.025
If reset delay type=IDMT: Q>> 10000x1W(1) Q<< ?
tReset 0.00s tReset 0.00s
Rtms 0.025 tQ>> 0.00s No
tReset 0.00s
No Yes
Ie> I>> I>>
Interlock Yes Q<< 1x1W(2)
(1) tQ<< 0.00s
or 10000x5W
or 40000x1W No
or 40000x5W (2)
or 1x5W or 4x1W
or 4x5W
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

PROTECTION (prev) PROTECTION G1/G2 PROTECTION (contd)

(G3… G8)

[32N] Earth [59] Phase Over [27] Phase Under

[46] Neg Seq OC [49] Therm OL [37] Under current
Wattmetric Voltage Voltage

Mode I2> ? Therm OL I< ? U> ? U< ?

Menu Content Tables

Pe No No No No No
Pe
Yes Yes Yes OR / AND OR / AND
Pe>
MiCOM P125/P126 & P127

No I2> 25.00 In Iθ> 0.10 In I< 0.10 In U> 260.0 V U< 5.0 V
Yes Delay type DMT Te 1 mn tI< 0.00s tU> 0.00s tU< 0.00s
tI2>(1) 0.00 s K 1.05 52a Inhib. U<? No
Pe> 160.0x1W θTrip 100 %
Delay Type DMT No No
I< Inhibited on No
tPe>(1) 0.00s No U>> ?
I2>> ? 52 a No U<< ?
tReset 0.04s No
No θ Alarm No
No
No No OR / AND
Yes OR / AND
Pe>> Yes I< Inhibited on
U< No U>> 260.0 V
No I2>> 40.00 In U<< 5.0 V
θ Alarm tU>> 0.00s
Yes tI2>> 0.00 s 90% Yes tU<< 0.00s
No 52a Inhib. U<<? No
Pe>> 160.0x1W No Yes No I< Inhibited on
tPe>> 0.00s U< 5.0 V
tReset 0.04s I2>>> ? No
Pe/IeCos Angle 0° No No
No
IeCos Yes
IeCos> I2>>> 40.00 In
No tI2>>> 0.00 s (1) If Delay Type = DMT
Yes Otherwise, the following
No menus are displayed
IeCos> 8.000Ien
Delay Type DMT
tIeCos>(1) 0.00s Delay Type ≠ DMT
tReset 0.04s
IEEE, IEC,
No RECT or CO
RI
tIeCos>> TMS 0.025
K 0.025
No Reset Delay TypeDMT
tReset 0.00s
Yes If reset delay type=IDMT:
IeCos>> 8.000Ien Rtms 0.025
tIeCos>> 0.00s tReset 0.00s
tReset 0.04s
No Pe/IeCos Angle 0°
P12y/EN HI/E95

Page 19/24
 DEFAULT DISPLAY
IA = 1245 A

PROTECTION (prev) PROTECTION G1/G2 AUTOMAT CTRL

Page 20/24

(G3… G8)
P12y/EN HI/E95

[59N] residual PROTECTION G1/G2

[79] Autoreclose [81] Frequency
Over Voltage (G3… G8)

Ue>>>> ? Autoreclose F1 ? [81R] FREQ. RATE

No Dead Time
260.0 V No OF CHANGE
tI> 0.05 s
Yes Yes
tI>> 0.05 s 81> / 81<
Ext CB Fail ? tI>>> 0.05 s
Ue>>>> 5.0 V dF/dt1 ?
No tIe> 0.05 s F1 50.00 Hz
tUe>>>> 0.00s No
tIe>> 0.05 s tF1 0.00 s
Yes
tIe>>> 0.05 s Yes
No Ext CB Fail Time No
1.00 s dF/dt1=
F2 No
1.0 Hz/s
No Reclaim Time F3 No
tR 5.00 s F4 No
Ext Block
F5 No No
Yes
F6 No
Yes dF/dt2 ? No
Inhib Time 81> / 81< dF/dt3 ? No
Rolling demand ? tR 5.00 s dF/dt4 ? No
F6 50.00 Hz
No dF/dt5 ? No
tF6 0.00 s
Yes Phase Cycles
4 Yes
Max cycles nb No
10 dF/dt6 ?
E/Gnd Cycles No
Time period 4
10 mn
dF/dt6=
No Cycles 4321 1.0 Hz/s
tI> 1111
Dead Time tI>> 1111 No
TD1 5.00 s tI>>> 1111
TD2 5.00 s tIe> 1111
TD3 5.00 s tIe>> 1111
TD4 5.00 s tIe>>> 1111
tPe/IeCos> 1111
tPe/IeCoss>>1111
No tAux1 1111
tAux2 1111
MiCOM P125/P126 & P127
Menu Content Tables
DEFAULT DISPLAY
IA = 1245 A

PROTECTION (prev) AUTOMAT CTRL (contd)

AUTOMAT. CTRL

Trip Commands Latch Relays Blocking Loqic 1 / 2 Inrush blocking Logic Select 1/2

Trip tI> No Trip tUe>>>>No Latch :87654321 Block tI> No Block tUe>>>> Inrush blocking Sel1 tI >>
Menu Content Tables

Trip tI>> No 00000000 Block tI>> No No No No

Trip tI>>> No Block tI>>> No Yes
Trip tF1 No
Trip tF2 No Block tF1 No Inr. harmonic 2 Sel 1 tI >>>
MiCOM P125/P126 & P127

Trip tIe> No Trip tF3 No Block tIe> No Block tF2 No ratio = 20.0% No
Trip tIe>> No Trip tF4 No Block tIe>> No Block tF3 No
Trip tIe>>> No Trip tF5 No Block tIe>>> No Block tF4 No
Trip tIe>>>> No T Inrush reset Sel1 tle >>
Trip tF6 No Block tF5 No
0 ms No
Block tF6 No
Block tIe>>>> No
Trip tP> No Trip dF/dt1 No
Trip tP>> No Inrush block. on Sel 1 tle >>>
Trip dF/dt2 No
Trip tP< No I> Yes No
Trip dF/dt3 No Block tP> No Block dF/dt1 No
Trip tP<< No Trip dF/dt4 No Block tP>> No I>> No
Block dF/dt2 No
Trip tQ> No Trip dF/dt5 No I>>> No Sel 1 tle >>>>
Block dF/dt3 No
Trip tQ>> No Trip dF/dt6 No Ie> Yes No
Block dF/dt4 No
Trip tQ< No Block tPe/IeCos> Ie>> No
Block dF/dt5 No
Trip tQ< No No Ie>>> No
Block dF/dt6 No
Trip Brkn.Cond No Block tPe/IeCos >> Ie>>>> No t Sel 1
No I2> Yes 150 ms
Trip tPe/IeCos> No
Trip tPe/IeCos >>No I2>> No
Trip tAux1 No Block TBrk.Cond I2>>> No
Trip tAux2 No Block tI2> No No
Trip tI2> No Trip tAux3 No Block tI2>> No No
Trip tI2>> No Trip tAux4 No Block tI2>>> No
Trip tI2>>> No Trip tAux5 No Block tAux1 No
Trip tAux6 No Block tAux2 No
Trip Thermal θ No Trip tAux7 No Block Thermal θ No Block tAux3 No
Trip tI< No Trip tAux8(1) No Block tI< No Block tAux4 No
Trip tAux9(1) No Block tAux5 No
Trip tAuxA(1) No Block tAux6 No
Trip tU> No Trip tAuxB(1) No Block tU> No Block tAux7 No
Trip tU>> No Trip tAuxC(1) No Block tU>> No Block tAux8(1) No
Block tAux9(1) No
tEQU. A ? No Block tAuxA(1) No
Trip tU< No Trip SOTF No … Block tU< No Block tAuxB(1) No
Trip tU<< No Ctrl Trip No tEQU. H ? No Block tU<< No Block tAuxC(1)No
P12y/EN HI/E95

Page 21/24
DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL (prev) AUTOMAT CTRL (contd)

AUTOMAT. CTRL
Page 22/24

Output Relays Inputs Broken Conductor Cold Load PU

P12y/EN HI/E95

Inputs 1/2/3/4/5/ Brkn.Cond ? Cold Load PU ?

Trip 8765432 8765432 8765432 8765432 6/7 Aux Time Yes Yes
1000100 1000100 1000100 1000100 8/9/A/B/C(1) Yes
I> tQ>> tF3 79 int. Lock.
tl > Q< F4 79 ext. Lock. Brkn.Cond Time Input?
I_R> tQ< tF4 SOTF Unlatch Aux1 Time tBC 32 s Yes
I >> Q<< F5 Control trip Blk Log 1 tAux1 0.00 s
tl >> tQ<< tF5 Control Close Blk Log 2 tAux2 0.00 s
I_R>> Pe/IeCos> F6 Active Group 52 a tAux3 0.00 s Ratio I 2/I 1
Auto?
I >>> tPe/IeCos> tF6 Input 1 52 b tAux4 0.00 s 20 % No
tl >>> Pe/IeCos>> F.OUT Input 2 CB FLT tAux5 0.00 s
dF/dt1 Input 3 Aux 1 tAux6 0.00 s No
I_R>>> tPe/IeCos>>
tIA> I2> dF/dt2 Input 4 Aux 2 tAux7 0.00 s
Aux 3 Cold Load PU
tIB> tI2> dF/dt3 Input 5 tAux8(1) 0.00 s
Aux 4 tl> ? Yes
tIC I2>> dF/dt4 Input 6 tAux9(1) 0.00 s
Aux 5 tI>> ? Yes
Ie > tI2>> dF/dt5 Input 7 tAuxA(1) 0.00 s
Aux 6 tI>>> ? Yes
tle > I2>>> dF/dt6 Input 8(1) tAuxB(1) 0.00 s
Aux 7 tIe> ? Yes
Ie_R> tI2>>> Brkn Cond Input 9(1) tAuxC(1) 0.00 s
Aux 8(1) tIe>> ? Yes
Ie >> Therm Alarm CB Alarm Input A(1)
Aux 9(1) tIe>>> ? Yes
tle >> Therm Trip 52 Fail Input B(1)
Aux A(1) tIe>>>> ? Yes
Ie_R>> I< CB Fail Input C(1)
Aux B(1) tI2> ? Yes
Ie >>> tI< CB Close VTS
Aux C(1) tI2>> ? No
tle >>> U> tAux1 CTS
Strt Dist tI2>>> ? Yes
Ie>>>> tU> tAux2 tEqu. A
Cold L PU tTherm ? Yes
tIe>>>> U>> tAux3 tEqu. B
Ie_R>>> tU>> tAux4 tEqu. C Log Sel 1
P> U< tAux5(1) tEqu. D Log Sel 2
tP> tU< tAux5 tEqu. E Changeset Cold Load PU
P>> U<< tAux6 tEqu. F Block 79 Level 120 %
tP>> tU<< tAux7 tEqu. G θ Reset
P< Ue>>>> tAux8(1) tEqu. H Trip Circ
tP< tUe>>>> tAux9(1) Order Comm1 Start tBF Cold Load PU
(1) Available with P127 optional configuration
P<< F1 tAuxA(1) Order Comm2 Maint. M. tCL 2s
tP<< tF1 tAuxB(1) Order Comm3 SOTF
Q> F2 tAuxC(1) Order Comm4 Local No
tQ> tF2 79 Run Synchro.
Q>> F3 79 Trip Reset led
Ctrl Trip
Ctr Close
MiCOM P125/P126 & P127
Menu Content Tables
 DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL (prev) AUTOMAT CTRL (contd)

AUTOMAT. CTRL

SOTF BOOL Logic Equat Comm. Order

51V VT Supervision CT Supervision CB Fail CB Supervision
delay
Menu Content Tables

(U< OR V2>) VTS Alarm ? CT Supervision ? CB Fail ? TC Supervision ? Sotf Equation tOrder Comm 1 0.1s
& I>> No No No No No No A/B/C/D/E/F/G/H tOrder Comm 2 0.1s
Yes Yes Yes Yes Yes tOrder Comm 3 0.1s
t trip circuit tSotf tOrder Comm 4 0.1s
MiCOM P125/P126 & P127

VTS Blocks 51V ? Ie> I < BF

V2> 130.0V tSUP 3s 100 ms Equ.A Toperat.
No 0.08 In 0.1 In
No = 0.00s
No
CB Open S’vision ? I >>
(U<< OR V2>>) VTS Blocks Prot- Ue< CB Fail Time No Yes Equ.A Treset
& I>>> No ections ? No 5V tBF 0.10 s Yes = 0.00s
Yes Yes CB Open Time I >>>
VTS Non-dir tCTS Block I > ? 150 ms Yes
V2>> 130.0V
I> ? Yes 0.2s No No 1/2 A.00
I>> ? Yes CB Close S’vision ? OR NONE
No No Ctrl close input
I>>> ? Yes Yes AND NOT NONE
No AND NONE
Ie> ? Yes Bloc Ie > ?
Yes OR NOT None
Ie>> ? Yes Yes
Ie>>> ? Yes CB Close Time SOTF Input
No 150 ms
Ie>>>> ? Yes Yes
2/2 A.00
No
OR NONE
CB Open Alarm ? HMI closing order
Yes No
tVTS 130.0V
Yes
CB Open NB [79] closing
1500 Yes
No
ΣAmps (n) ? Front comm order
No Yes
No
Yes
tOpen Pulse
ΣAmps (n) Rear comm order
300ms
3 E6 Yes

tClose Pulse (1)

(1) Available with P127
n Rear2 comm order
500 ms optional configuration
2 Yes
No
P12y/EN HI/E95

Page 23/24
 DEFAULT DISPLAY
IA = 1245 A

AUTOMAT. CTRL (prev) OP PARAMETERS

RECORDS
Page 24/24
P12y/EN HI/E95

CB Monitoring Fault Record Instantaneous Disturbance Record Time Peak Value Rolling Demand

CB Opening Time Record Number Number Records number Time Window Sub Period
83 ms 25 5 5 5 mn 1mn

CB Closing Time Fault Time VAB Magnitude Hour Pre-Time Num of Sub Per
100 ms 12:05:23:42 103 A 13:07:15:53 0.1 s 1

CB Operations Fault Date VBC Magnitude Date Disturb Rec Trig

RST = [C] 1312 09/01/01 103 A 09/01/01 ON INST.

ΣAmps (n) Active Set Group VCA Magnitude Origin

RST= [C] 2 103 A Ie>

ΣAmps (n) IA Faulted Phase VN Magnitude Length

5 E6 EARTH 103 A 57 ms

ΣAmps (n) IB Threshold IA^VBC ANGLE Trip

5 E6 I> 103 A No

ΣAmps (n) IC Magnitude IB^VBC ANGLE

5 E6 1200 A 103 A

IA Magnitude IC^VBC ANGLE

1200 A 103 A

IB Magnitude IN^VN ANGLE

500 A 103 A

IC Magnitude
480 A
MiCOM P125/P126 & P127
Menu Content Tables
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127

TECHNICAL DATA AND

CHARACTERISTIC CURVES
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 1/46

CONTENT

1. RATINGS 5
1.1 Power Supply 5
1.2 Frequency 5
1.3 Current Inputs 5
1.4 Measurement Current Inputs (P127 with measurement CT) 5
1.5 Voltage Inputs 6
1.6 Logic Inputs 6
1.6.1 Supply 6
1.7 Output Relay Characteristic 7

2. MECHANICAL DATA 8

3. INSULATION WITHSTAND 9

4. ELECTRICAL ENVIRONMENT 10

5. ENVIRONMENT 11

6. EU DIRECTIVE 12
6.1 EMC compliance 12
6.2 Product safety 12

7. GENERAL INFORMATION AND DEVIATION OF THE PROTECTION

ELEMENTS 13

8. DEVIATION OF AUTOMATION FUNCTIONS TIMERS 15

9. DEVIATION OF MEASUREMENTS 16
9.1 Measurements 16
9.2 Metering (P127 with measurement CT) 16

10. PROTECTION SETTING RANGES 17

10.1 [67/50/51] Directional/Non-Directional Phase Overcurrent (P127) 17
10.1.1 Synchronous Polarisation 17
10.1.2 Protection Setting Ranges (P127) 17
10.2 [50/51] Phase Overcurrent Protection (P126) 18
10.3 [67N/50N/51N] Dir./Non-Dir. Earth fault protection (P125, P126 & P127) 19
10.3.1 Protection Setting Ranges 19
10.4 Earth Wattmetric Protection 22
10.4.1 Functionality Mode 22
10.4.2 Protection Setting Ranges 22
P12y/EN TD/E95 Technical Data

Page 2/46 MiCOM P125/P126 & P127

10.5 Undercurrent Protection (P126 & P127) 24

10.5.1 Protection Setting Ranges 24
10.6 Negative Sequence Overcurrent Protection (P126 & P127) 24
10.6.1 Protection Setting Ranges 24
10.7 Thermal Overload Protection (P126 & P127) 25
10.7.1 Protection Setting Ranges 25
10.8 Undervoltage Protection (P127) 25
10.8.1 Protection Setting Ranges (P127) 25
10.9 Overvoltage Protection (P127) 26
10.9.1 Protection Setting Ranges (P127) 26
10.10 Under/over frequency Function (P127) 26
10.10.1 Protection Setting Ranges (P127) 26
10.10.2 Rate of change of frequency (P127) 27
10.11 Directional power Function (P127) 27
10.11.1 Protection Setting Ranges 28
10.12 Residual Overvoltage Protection 28
10.12.1 Protection Setting Ranges 28
10.13 Multishot Autoreclose Function (P126 & P127) 29
10.13.1 Multishot Autoreclose Settings 29
10.13.2 Further timing 30

11. AUTOMATION CONTROL FUNCTIONS 31

11.1 Trip commands 31
11.2 Latch relays 31
11.3 Blocking logic 31
11.4 Inrush blocking Logic (P127) 31
11.5 Logic select 32
11.6 Output relays 32
11.7 Inputs 32
11.7.1 Inputs assignation 32
11.7.2 Auxiliary Timers (P126 & P127) 33
11.8 Broken Conductor Detection (P126 & P127) 33
11.8.1 Broken conductor detection setting range 33
11.9 Cold Load Pickup (P126 & P127) 33
11.10 51V function (P127) 34
11.11 VT Supervision (P127 only) 34
11.11.1 VT Supervision Setting range 34
11.12 CT Supervision (P127) 34
11.12.1 CT Supervision Setting range 34
11.13 Circuit Breaker Failure (P126 & P127) 35
11.13.1 Circuit Breaker Failure Setting range 35
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 3/46

11.14 Trip Circuit Supervision (P126 & P127) 35

11.14.1 Trip Circuit Supervision Setting range 35
11.15 Circuit Breaker Control and Monitoring (P126 & P127) 35
11.15.1 Setting Ranges 35
11.16 SOTF/TOR Switch on to fault / Trip on reclose (P126 & P127) 36
11.16.1 Setting Ranges 36
11.17 Logic Equation (P126 & P127) 36
11.17.1 Timer Setting Ranges 36
11.17.2 Available logical gates 37
11.17.3 Available signals 37
11.18 Communication order delay 39

12. RECORDING FUNCTIONS (P126 & P127) 40

12.1 Event Records 40
12.2 Fault Records 40
12.3 Instantaneous recorder 40
12.4 Disturbance Records 40
12.4.1 Triggers; Data; Setting Ranges 40

13. COMMUNICATION 41

14. IRIG-B INTERFACE 42

15. CURVES 43
15.1 General 43
15.1.1 Inverse Time Curves: 43
15.1.2 Reset Timer 44
15.2 Thermal Overload Curves 45
P12y/EN TD/E95 Technical Data

Page 4/46 MiCOM P125/P126 & P127

BLANK PAGE
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 5/46

1. RATINGS
1.1 Power Supply

Nominal auxiliary voltage Vx 24 – 60Vdc / 48 – 250Vdc/ 24 – 250Vdc

24 – 240 Vac / 48-240 Vac
Operating range DC ± 20% of Vx
AC – 20%, +10% of Vx
Residual ripple Up to 12%
Stored energy time ≥50 ms for interruption of Vx
Burden P125 Stand by: <3W DC or <8VA AC
Max: <5W DC or <12VA AC
Burden P126 Stand by: <3W DC or <8VA AC
Max: <6W DC or <14VA AC
Burden P127 Stand by: <3W DC or <8VA AC
Max: <6W DC or <14VA AC

1.2 Frequency

Frequency protection functions From 45 to 65Hz

Nominal frequency 50/60Hz

1.3 Current Inputs

Phase current inputs 1 and 5A by connection

Earth current inputs 1 and 5A by connection
Operating range Selection by ordering code (Cortec)
Burden Phase Current < 0.025VA (1A)
< 0.3VA (5A)
Burden Earth Current < 0.08VA (1A)
< 0.42VA (5A)
Rrp (Impedance of relay phase 25 mΩ (1A input)
current input at 30In) 8 mΩ (5A input)
Rrn (Impedance of relay neutral 87 mΩ (1A input)
current input at 30In) 15 mΩ (5A input)

Thermal withstand 1s @ 100 x rated current

2s @ 40 x rated current
continuous @ 4 x rated current

1.4 Measurement Current Inputs (P127 with measurement CT)

Phase current inputs 1 and 5A by connection

Operating range Selection by ordering code (Cortec)
Burden Phase Current < 0.5VA
Bandwidth 500Hz
Thermal withstand 1s @ 20 x rated current
4s @ 10 x rated current
continuous @ 2 x rated current
P12y/EN TD/E95 Technical Data

Page 6/46 MiCOM P125/P126 & P127

1.5 Voltage Inputs

Voltage input range Un 57 to 130V 220 to 480V

Operating range (measuring range) 0 to 260V 0 to 960V
Burden Resistive 44 kΩ: 438 kΩ:
0.074W/57V 0.1102W/220V
0.38W/130V 0.525W/480V
1.54W/260V 2.1W/960V
Thermal Withstand:
Continuous 260V ph-ph 960V ph-ph
10 seconds 300V ph-ph 1300V ph-ph

1.6 Logic Inputs

Logic input type Independent optically insulated

Logic input burden < 10 mAmps per input
Logic input recognition time < 5ms

1.6.1 Supply

Relay auxiliary power supply Logic Inputs

Ordering
Code Nominal Operating Nominal Minimal Maximum Holding Maximum
voltage range voltage range Voltage range polarisation polarisation current continuous
Vx voltage current after 2 ms withstand
A 24 - 60 Vdc 19,2 – 76 Vdc
24 – 250 Vdc 19,2 Vdc 300 Vdc
F 48 – 250 Vdc 38.4 – 300 Vdc 24 – 240 Vac 19,2 Vac 35 mA 2.3 mA 264 Vac
48 – 240 Vac 38.4 – 264 Vac
T 48 – 250 Vdc
48 – 240 Vac 38.4 – 300 Vdc 24 – 250 Vdc 19,2 Vdc 300 Vdc
38.4 – 264 Vac 24 – 240 Vac 19,2 Vac 35 mA 2.3 mA 264 Vac
Special EA (**)
H 48 – 250 Vdc 38.4 – 300 Vdc
48 – 240 Vac 38.4 – 264 Vac 129 Vdc 105 Vdc 3.0 mA @ 129 Vdc 145 Vdc

V 48 – 250 Vdc 38.4 – 300 Vdc

48 – 240 Vac 38.4 – 264 Vac 110 Vdc 77 Vdc 7.3 mA @ 110 Vdc 132 Vdc

W 48 – 250 Vdc 38.4 – 300 Vdc

48 – 240 Vac 38.4 – 264 Vac 220 Vdc 154 Vdc 3.4 mA @ 220 Vdc 262 Vdc

24 – 250 Vdc 19,2 – 300 Vdc 24 – 250 Vdc 19,2 Vdc

35 mA 2.3 mA
300 Vdc
Z
24 – 250 Vac 19.2 – 264 Vac 24 – 240 Vac 19,2 Vac 264 Vac

(**) Logic input recognition time for EA approval. Dedicated filtering on 24 samples (15 ms at
50 Hz)
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 7/46

1.7 Output Relay Characteristic

Contact rating
Contact relay Dry contact Ag Ni
Make current Max. 30A and carrry for 3s
Carry capacity 5A continuous
Rated Voltage 250Vac
Breaking characteristic
Breaking capacity AC 1500 VA resistive
1500 VA inductive (P.F. = 0.5)
220 Vac, 5A (cos ϕ = 0.6)
Breaking capacity DC 135 Vdc, 0.3A (L/R = 30 ms)
250 Vdc, 50W resistive or
25W inductive (L/R=40ms)
Operation time <7ms
Durability
Loaded contact 10000 operation minimum
Unloaded contact 100000 operation minimum
P12y/EN TD/E95 Technical Data

Page 8/46 MiCOM P125/P126 & P127

2. MECHANICAL DATA
Design
MiCOM P125, P126 and P127 relays are available in a 4U metal case for panel or flush
mounting.
The table shows the case size of the different models:

Version Height Depth Width

Type P125 4U (177mm) 230mm 20 TE
Type P126 & P127 4U (177mm) 230mm 30 TE

Weight
P125 approx.: 3.0 Kg
P126/7 approx.: 4.0 Kg
Mounting
Rack or flush mounting.
Connections
Rear (double fast on + M4 screw per connection).
Full draw-out with automatic CT shorting in the case of the relay.
Enclosure protection
Per IEC 60529: 2001:

− IP 52 Protection (front panel) against dust and dripping water,

− IP 50 Protection for the rear and sides of the case against dust,

− IP 10 Product safety protection for the rear due to live connections on the terminal
block.
Dimensions
See dimensions diagram (P12y/EN IN chapter).
PC Interface
DIN 41652 connector (X6),
type D-Sub, 9-pin.
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 9/46

3. INSULATION WITHSTAND
Dielectric withstand IEC 60255-5: 2000 2 kVrms 1 minute to earth and between
independent circuits.
IEEE C39.90:1989 1.5kV rms AC for 1 minute,
(reaffirmed 1994) across normally open
contacts.
Impulse voltage IEC 60255-5: 2000 5 kVp Between all terminals & all terminals
and case earth.

Insulation resistance IEC 60255-5: 2000 > 1000 MΩ at 500 Vdc

P12y/EN TD/E95 Technical Data

Page 10/46 MiCOM P125/P126 & P127

4. ELECTRICAL ENVIRONMENT
High frequency IEC 60255-22-1:1998 2.5 kV common mode, class 3
disturbance 1 kV differential mode, class 3
Fast transient IEC 60255-22-4:2002 Class A
2 kV 5kHz terminal block comms
4 kV 2.5kHz all circuits excluding comms.
EN 61000-4-4:1995 2 kV 5kHz all circuits excluding power
Level 4 supply
4 kV 5kHz power supply
Electrostatic EN 61000-4-2:1995 & 8 kV contact discharge, class 4
discharge IEC60255-22-2:1996 15kV air discharge, class 4
Surge Immunity EN 61000-4-5:1995 & 4kV common mode, level 4
IEC 60255-22-5:2002 2kV differential mode, level 4
Conducted emissions EN55022:1998 & 0.15-0.5MHz, 79dBµV (quasi peak)
IEC 60255-25:2000 66 dBµV (average)
0.5-30MHz, 73dBµV (quasi peak)
60 dBµV (average)
Radiated emissions EN55022:1998 & 30-230MHz, 40dBµV/m at 10m
IEC 60255-25:2000 measurement distance
230-1GHz, 47dBµV/m at 10m
measurement distance
Conducted immunity EN 61000-4-6:1996 & Level 3, 10V rms @ 1kHz 80% am,
IEC 60255-22-6:2001 150kHz to 80MHz
Radiated Immunity EN 61000-4-3:2002 & Level 3, 10V/m 80MHz to 1GHz @ 1kHz
IEC 60255-22-3:2000 80% am
Radiated Immunity EN 61000-4-3:2002 Level 4, 30V/m 800MHz to 960MHz and
from digital 1.4GHz to 2GHz @ 1kHz 80% am
telephones
ANSI/ 35V/m 80MHz to 1GHz @ 1kHz 80% am
IEEE C37.90.2:2004 35V/m 80MHz to 1GHz @ 100% pulse
modulated front face only
Magnetic field EN 61000-4-8:1994 Level 5, 100A/m applied continuously,
immunity 1000A/m for 3s
EN 61000-4-9:1993 Level 5, 1000A/m
EN 61000-4-10:1993 Level 5, 100A/m at 100kHz and 1MHz
ANSI Surge withstand IEEE/ 4kV fast transient and 2.5kV damped
capability ANSI C37.90.1:2002 oscillatory applied common and
transverse mode
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 11/46

5. ENVIRONMENT
Temperature IEC 60255-6 Ambient temperature range
Operating temperature range
–25°C to +55°C (or –13°F to +131°F)
Storage and transit
–25°C to +70°C (or –13°F to +158°F)*

Tested as per
IEC 60068-2-1: 2007
-25°C (–13°F) storage (96 hours)
-40°C (–40°F) operation (96 hours)
IEC 60068-2-2: 2007
+85°C (+185°F) (storage (96 hours)
+85°C (+185°F) operation (96 hours)
(*) The upper limit is permissible for a single
6 hour duration within any 24 hour period.

Humidity IEC 60068-2-78:2001 56 days at 93% RH and 40 °C

Enclosure IEC 60-529: 2001 IP 52 Protection (front panel) against
protection dust and dripping water,
IP 50 Protection for the rear and sides
of the case against dust,,
IP 10 Product safety protection for the
rear due to live connections on the
terminal block
Sinusoidal IEC 60255-21-1:1998 Response and endurance, class 2
Vibrations
Shocks IEC 60255-21-2:1998 Response and withstand, class 1 & 2
Bump IEC 60255-21-2:1998 Response and withstand, class 1
Seismic IEC 60255-21-3:1998 Class 2
Creepage IEC 60255-27: 2005 Pollution degree 2, Overvoltage
Distances and category III, Impulse test voltage 5 kV
Clearances
Corrosive Per IEC 60068-2-60: Industrial corrosive environment/poor
Environments 1995, Part 2, Test Ke, environmental control, mixed gas flow
Method (class) 3 test.
21 days at 75% relative humidity and
+30°C
Exposure to elevated concentrations of
H2S, NO2, Cl2 and SO2.
P12y/EN TD/E95 Technical Data

Page 12/46 MiCOM P125/P126 & P127

6. EU DIRECTIVE
6.1 EMC compliance

89/336/EEC
93/31/EEC
Compliance with European Commission EMC Directive.
Generic standards were used to establish conformity:
EN50081-2: 1994
EN60952-2: 1995
6.2 Product safety

2006/95/EC
(replacing 73/23/EEC from
01/2007)
Compliance with European Commission Low Voltage Directive. Compliance is demonstrated
by reference to generic safety standards:

− EN61010-1: 1993/A2: 1995

− EN60950: 1992/A11: 1997

Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 13/46

7. GENERAL INFORMATION AND DEVIATION OF THE PROTECTION

ELEMENTS
Glossary
I : Phase current
Is : I>, I>>, I>>> & I<
I2s : I2>, I2>> & I2>>>
Ies : Ie>, Ie>> & Ie>>>
IesCos : IeCos> & IeCos>>
P : Active over / under power, P>, P>> and P<, P<<
Q : Reactive over / under power, Q>, Q>> and Q<, Q<<
Pe : Earth fault (wattmetric)
Pes : Pe> & Pe>>
Us : U>, U>>, U< & U<<
Urs : Ue>, Ue>>, Ue>>> & Ue>>>>
DT : Definite time
IDMT : Inverse definite minimum time

Element Range Deviation Trigger Reset Time deviation

Phase overcurrent 0.1 to 40 In ± 2% DT: Is ± 2% 0.95 Is ±2% ±2% +30…50ms
elements IDMT: 1.1Is ±2% 1.05 Is ±2% ±5% +30…50ms
I> & I>> & I>>>
Relay characteristic 0° to 359° ≤ 3°
angle RCA
(RCA-Torque angle)
Trip zone ±10° to ±170° ≤ 3°
Earth fault overcurrent 0.002 to 1Ien ± 2% DT: Ies ± 2% 0.95 Ies ±2% ±2% +30…50ms
elements 0.01 to 8 Ien IDMT: 1.1Ies ±2% 1.05 Ies ±2% ±5% +30…50ms
Ie> & Ie>> & Ie>>> 0.1 to 40 Ien
Wattmetric earth fault 57 to 130V ±4% ± error DT: Pes 0.95 Pes ±2% +30…50ms
elements 0.2 to 20W on cos ϕ ± accuracy ± accuracy
1 to 160W IDMT: 1.1Pes 1.05 Pes ±5% +30…50ms
10 to 800W ± accuracy ± accuracy
Wattmetric earth fault 220 to 480V ±4% ± error DT: Pes 0.95 Pes ±2% +30…50ms
elements 1 to 80W on cos ϕ ± accuracy ± accuracy
Pe> & Pe>> 4 to 640W IDMT: 1.1Pes 1.05 Pes ±5% +30…50ms
40 to 3200W ± accuracy ± accuracy
Active earth fault 0.002 to 1Ien ±2% ± error DT: IesCos 0.95 IesCos ±2% +30…50ms
overcurrent elements 0.01 to 8 Ien on cos ϕ ± accuracy ± accuracy
IeCosϕ> & IeCosϕ>> 0.1 to 40 Ien IDMT: 1.1 IesCos 1.05 IesCos ±5% +30…50ms
± accuracy ± accuracy
Negative sequence 0.1 to 40 In ± 2% DT: I2s ± 2% 0.95 I2s ±2% ±2% +30…50ms
phase overcurrent IDMT: 1.1I2s ±2% 1.05 I2s ±2% ±5% +30…50ms
elements
I2>, I2>> & I2>>>
Phase undercurrent 0.1 to 1 In ± 2% DT: I< ± 2% 1.05 I< ±2% ±2% +30…50ms
element I<
Broken conductor [I2/I1]. 20 to 100% ± 3% DT: I2/I1 ± 3% 0.95 I2/I1 ±3% ±2% +30…50ms
Thermal overload 0.10 to 3.2 In ± 3% IDMT: Iθ> ± 3% 0.97 Iθ>±3% –5% +30…50ms
Iθ>, θ Alarm, θ Trip (ref. IEC 60255-8)
P12y/EN TD/E95 Technical Data

Page 14/46 MiCOM P125/P126 & P127

Element Range Deviation Trigger Reset Time deviation

Overvoltage 57 to 130V ± 2% DT: Us ± 2% 0.95 Us ±2% ±2% +20…40ms
U> & U>> 2 to 260V
Overvoltage 220 to 480V ± 2% DT: Us ± 2% 0.95 Us ±2% ±2% +20…40ms
U> & U>> 10 to 960V
Undervoltage 57 to 130V ± 2% DT: Us ± 2% 1.05 Us ±2% ±2% +20…40ms
U< & U<< 2 to 130V
Undervoltage 220 to 480V ± 2% DT: Us ± 2% 1.05 Us ±2% ±2% +20…40ms
U< & U<< 10 to 480V
Residual overvoltage 57 to 130V ± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +20…40ms
(Direct input)
Ue>, Ue>>, Ue>>>, 1 to 260V
Ue>>>> 1 to 260V
Residual overvoltage 220 to 480V ± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +20…40ms
(Direct input)
Ue>, Ue>>, Ue>>>, 4 to 960V
Ue>>>> 5 to 960V
Derived residual 57 to 130V ± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +20…40ms
overvoltage or 0.2V
Ue>, Ue>>, Ue>>>, 1 to 260V
Ue>>>> 1 to 260V
Derived residual 220 to 480V ± 2% DT: Urs ± 2% 0.95 Urs ±2% ±2% +20…40ms
overvoltage or 1V
Ue>, Ue>>, Ue>>>, 4 to 960V
Ue>>>> 5 to 960V

Overfrequency 45,1 to 54,9Hz

± 2% DT: Fx ± 2% 0.95 Fx ±2% ±2% +80…100ms
Fx> 55,1 to 64,9Hz

Underfrequency 45,1 to 54,9Hz

± 2% DT: Fx ± 2% 1.05 Fx ±2% ±2% +80…100ms
Fx< 55,1 to 64,9Hz
1 to 10000*1W
Active overpower 4 to 40000*1W
± 5% DT: P> & P>> ± 2% 0.95 P> ±2% ±2% +20…40ms
P>&P>> 1 to 10000*5W
4 to 40000*5W
1 to 10000*1W
Active underpower 4 to 40000*1W
± 5% DT: P< & P<< ± 2% 0.95 P< ±2% ±2% +20…40ms
P<&P<< 1 to 10000*5W
4 to 40000*5W
1 to 10000*1W
Reactive overpower 4 to 40000*1W
± 5% DT: Q> & Q>> ± 2% 0.95 Q> ±2% ±2% +20…40ms
Q>&Q>> 1 to 10000*5W
4 to 40000*5W
1 to 10000*1W
Reactive underpower 4 to 40000*1W
± 5% DT: Q< & Q<< ± 2% 0.95 Q< ±2% ±2% +20…40ms
Q<&Q<< 1 to 10000*5W
4 to 40000*5W
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 15/46

8. DEVIATION OF AUTOMATION FUNCTIONS TIMERS

Autoreclose timers tDs, tR, tI ±2% +10…30ms
CB fail & CB monitoring timers ±2% +10…30ms
Auxiliary timers tAUX1, tAUX2, tAUX3, tAUX4, tAUX5, tAUX6, ±2% +10…30ms
tAUX7, tAUX8, tAUX9, tAUX10, tAUX11 and tAUX12 (when
available)
Cold load pickup ±2% +20…40ms
Inrush blocking ±2% +20…40ms
SOTF/TOR ±2% +20…40ms
Programmable AND, OR & NOT logic ±2% +10…30ms
P12y/EN TD/E95 Technical Data

Page 16/46 MiCOM P125/P126 & P127

9. DEVIATION OF MEASUREMENTS
9.1 Measurements

Measurement Range Deviation

Phase current 0.1 to 40 In Typical ±0.5% at In
Earth current 0.002 to 1Ien Typical ±0.5% at Ien
0.01 to 8 Ien Typical ±0.5% at Ien
0.1 to 40 Ien Typical ±0.5% at Ien
Voltage 57 to 260V Typical ±0.5% at Un
220 to 960V Typical ±0.5% at Un
Power Alpha Typical ±1° at Pn
P (active power) Typical ±5% at Pn
Q (reactive power) Typical ±5% at Pn

Active Power and Active Energy Reactive Power and Reactive Energy
Cos ϕ Deviation Sin ϕ Deviation
0.866 < 1.5% 0.866 < 3%
0.5 < 3% 0.5 < 1.5%

9.2 Metering (P127 with measurement CT)

Measurement Accuracy
Phase current <0.2% at IN
Voltage <0.2% at VN
Power <0.5% for Pm, Qm and Sm
Sampling rate 1600Hz
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 17/46

10. PROTECTION SETTING RANGES

Relay Number of protection group
P125 2
P126 2
P127 8

10.1 [67/50/51] Directional/Non-Directional Phase Overcurrent (P127)

− Phase current Fundamental only

− Phase or phase to phase voltage Fundamental only

− Minimum voltage operation 0.6V (Un: 57 to 130V)

− Minimum voltage operation 3.0V (Un: 220 to 480V)

10.1.1 Synchronous Polarisation

− Minimum phase voltage fixed threshold enabling

synchronous polarising: 0.6V

− Synchronous polarising permanence time

phase voltage thresholds: 5 s
NOTE: When I> is associated to an IDMT curve, the maximum setting
recommended should be 2In.
10.1.2 Protection Setting Ranges (P127)

Setting Range
[67] Phase OC
Min Max Step
I> ? No or Yes or DIR
I> 0.1 In 25 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tI> 0s 150 s 0.01 s
I> TMS 0.025 1.5 0.001
I> Reset Delay Type DT or IDMT
I> RTMS 0.025 3.2 0.025
I> tReset 0.00 s 100 s 0.01 s
I> I>> I>>> No or Yes
Interlock
I> Torque angle 0° 359° 1°
I> Trip zone ±10° ±170° 1°
I>> ? No or Yes or DIR
I>> 0.1 In 40 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
P12y/EN TD/E95 Technical Data

Page 18/46 MiCOM P125/P126 & P127

Setting Range
[67] Phase OC
Min Max Step
tI>> 0s 150 s 0.01 s
I>> TMS 0.025 1.5 0.001
I>> Reset Delay Type DT or IDMT
I>> RTMS 0.025 3,2 0.025
I>> tReset 0.00 s 100 s 0.01 s
I>> Torque angle 0° 359° 1°
I>> Trip zone ±10° ±170° 1°
I>>> ? No or Yes or DIR or Peak
I>>> 0.1 In 40 In 0.01 In
tI>>> 0s 150 s 0.01 s
I>>> Torque angle 0° 359° 1°
I>>> Trip zone ±10° ±170° 1°

10.2 [50/51] Phase Overcurrent Protection (P126)

− Phase current Fundamental only

NOTE: When I> and I>> is associated to an IDMT curve, the maximum
setting recommended should be 2In.
10.2.1.1 Protection Setting Ranges (P126)

Setting Range
[51] Phase OC
Min Max Step
I> ? No or Yes
I> 0.1 In 25 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tI> 0s 150 s 0.01 s
I> TMS 0.025 1.5 0.001
I> Reset Delay Type DT or IDMT
I> RTMS 0.025 3.2 0.025
I> tReset 0.00 s 100 s 0.01 s
I> I>> I>>> No or Yes
Interlock
I>> ? No or Yes
I>> 0.5 In 40 In 0.01 In
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tI>> 0s 150 s 0.01 s
I>> TMS 0.025 1.5 0.001
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 19/46

Setting Range
[51] Phase OC
Min Max Step
I>> Reset Delay Type DT or IDMT
I>> RTMS 0.025 3.2 0.025
I>> tReset 0.00 s 100 s 0.01 s
I>>> ? No or Yes or Peak
I>>> 0.5 In 40 In 0.01 In
tI>>> 0s 150 s 0.01 s

10.3 [67N/50N/51N] Dir./Non-Dir. Earth fault protection (P125, P126 & P127)

− Earth fault current Fundamental only

− Earth fault current ranges See following table

− Residual voltage Fundamental only

− Residual voltage range See following table

− Minimum residual voltage operation 0.7V (Uen: 57 to 130V)

− Minimum residual voltage operation 3.0V (Uen: 220 to 480V)

NOTE: When Ie> or Ie>> are associated to an IDMT curve, the maximum
setting recommended should be the maximum of the range divided by
20.
10.3.1 Protection Setting Ranges

Setting Range
[67N] Earth OC
Min Max Step
High sensitivity current set Cortec code P12-C-X---X
Ie> 0.002 Ien 1 Ien 0.001 Ien
Ie>> 0.002 Ien 1 Ien 0.001 Ien
Ie>>> 0.002 Ien 1 Ien 0.001 Ien
Ie>>>> 0.1 Ien 40 Ien 00.01 Ien
Med. sensitivity current set Cortec code P12-B-X---X
Ie> 0.01 Ien 1 Ien 0.005 Ien
Ie>> 0.01 Ien 8 Ien 0.005 Ien
Ie>>> 0.01 Ien 8 Ien 0.005 Ien
Ie>>>> 0.1 Ien 40 Ien 00.01 Ien
Low sensitivity current set Cortec code P12-A-X---X
Ie> 0.1 Ien 25 Ien 0.1 Ien
Ie>> 0.5 Ien 40 Ien 0.1 Ien
Ie>>> 0.5 Ien 40 Ien 0.1 Ien
Ie>>>> 0.1 Ien 40 Ien 00.01 Ien

Ie> ? No or Yes or DIR

P12y/EN TD/E95 Technical Data

Page 20/46 MiCOM P125/P126 & P127

Setting Range
[67N] Earth OC
Min Max Step
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tIe> 0s 150 s 0.01 s
Ie> TMS 0.025 1.5 0.025
Ie> Reset Delay Type DT or IDMT
Ie> RTMS 0.025 3.2 0.025
Ie> tReset 0.00 s 100 s 0.01 s
Ie> Ie>> Ie>>> No or Yes
Interlock
Ie> Torque angle 0° 359° 1°
Ie> Trip zone ±10° ±170° 1°
Input residual voltage with range from 57 to 130V
Ue> 1V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue> 4V 960 V 0.5 V
Ie>> ? No or Yes or DIR
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tIe>> 0s 150 s 0.01 s
Ie>> TMS 0.025 1.5 0.025
Ie>> Reset Delay Type DT or IDMT
Ie>> RTMS 0.025 3.2 0.025
Ie>> tReset 0.00 s 100 s 0.01 s
tIe>> 0s 150 0.01 s
Ie>> Torque angle 0° 359° 1°
Ie>> Trip zone ±10° ±170° 1°
Ie>> tReset 0.00 s 100 s 0.01 s
Input residual voltage with range from 57 to 130V
Ue>> 1V 260 V 0.1 V

Input residual voltage with range from 220 to 480V

Ue>> 4V 960 V 0.5 V
Ie>>> ? No or Yes or DIR or Peak
tIe>>> 0s 150 s 0.01 s
Ie>>> Torque angle 0° 359° 1°
Ie>>> Trip zone ±10° ±170° 1°
Ie>>> tReset 0.00 s 100 s 0.01 s
Input residual voltage with range from 57 to 130V
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 21/46

Setting Range
[67N] Earth OC
Min Max Step
Ue>>> 1V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue>>> 4V 960 V 0.5 V
Input residual voltage with range from 57 to 130V
Ue>> 1V 260 V 0.1 V

Input residual voltage with range from 220 to 480V

Ue>> 4V 960 V 0.5 V
Ie>>> ? No or Yes or DIR
tIe>>> 0s 150 s 0.01 s
Ie>>> Torque angle 0° 359° 1°
Ie>>> Trip zone ±10° ±170° 1°
Ie>>> tReset 0.00 s 100 s 0.01 s
Input residual voltage with range from 57 to 130V
Ue>>> 1V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue>>> 4V 960 V 0.5 V
Ie>>>> ? No or Yes or DIR
Delay type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tIe>>>> 0s 150 s 0.01 s
Ie>>>> TMS 0.025 1.5 0.025
Ie> Reset Delay Type DT or IDMT
Ie> RTMS 0.025 3.2 0.025
Ie>>>> tReset 0.00 s 100 s 0.01 s
Ie>>>> Torque 0° 359° 1°
Ie> Trip zone ±10° ±170° 1°
Input residual voltage with range from 57 to 130V
Ue(Ie>>>>) 1V 260 V 0.1 V
Input residual voltage with range from 220 to 480V
Ue(Ie>>>>) 4V 720 V 0.5 V

ATTENTION: THE Ue THRESHOLD SETTINGS DEPEND ON THE ADOPTED

CONNECTION OPTION. IN CONFIGURATION/GENERAL OPTIONS
MENU OF THE P127 RELAY THE Ve INPUT CAN BE SET DIRECTLY
FROM A VT (I.E. FROM A DELTA VT) OR CAN BE DERIVED FROM THE
MEASUREMENT OF THE THREE PHASE TO NEUTRAL VOLTAGES
(3VPN). IN THIS CASE THE Ue IS CALCULATED AS:
1
Ue = x(UA + UB + UC)
3
THE SETTING OF THE Ue THRESHOLDS MUST TAKE THE ABOVE
FORMULA IN ACCOUNT.
P12y/EN TD/E95 Technical Data

Page 22/46 MiCOM P125/P126 & P127

10.4 Earth Wattmetric Protection

− Earth fault current Fundamental only

− Residual voltage Fundamental only

− Minimum Operating Voltage

• Range from 57 to 130V 0.7 V

• Range from 220 to 480V 3.0 V

− Minimum Operating Current with Ien=1A and Ien=5A

• Range from 0.002 to 1 Ien 1 mA

• Range from 0.01 to 8 Ien 5 mA

• Range from 0.1 to 40 Ien 50 mA

NOTE: When Pe> or Iecos> is associated to an IDMT curve, the maximum
setting recommended should be the maximum of the range divided by 20.
10.4.1 Functionality Mode
This protection element can operate in Pe or IeCos mode.
10.4.2 Protection Setting Ranges

ATTENTION: the PE thresholds are displayed in the format:

## x K W

with ## = threshold value, and K = Ien.

The threshold value is in watt [W] secondary.
The PE> threshold setting value is 20 W and is to be set from the front panel keypad:

− if Ien = 1A, the internal relay setting value will be equal to 20 x 1 = 20W.

− if Ien = 5a, the internal relay setting value will be equal to 20 x 5 = 100w.

Setting range
[32N] Earth Wattmetric
Min Max Step
Mode Pe or IeCos
High sensitivity: Current input from 0.002 to 1 Ien
57–130V Input voltage Cortec code: P12-CAX---X
Pe> (*) 0.2xK W 20xK W 0.02xK W
Pe>> (*) 0.2xK W 20xK W 0.02xK W
220–480V Input voltage Cortec code: P12-CBX---X
Pe> (*) 1xK W 80xK W 0.1xK W
Pe>> (*) 1xK W 80xK W 0.1xK W
Med. Sensitivity: Current input from 0.01 to 8 Ien
57–130V Input voltage Cortec code: P12-BAX---X
Pe> (*) 1xK W 160xK W 0.1xK W
Pe>> (*) 1xK W 160xK W 0.1xK W
220–480V Input voltage Cortec code: P12-BBX---X
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 23/46

Setting range
[32N] Earth Wattmetric
Min Max Step
Pe> (*) 4xK W 640xK W 0.5xK W
Pe>> (*) 4xK W 640xK W 0.5xK W
Low sensitivity: Current input from 0.1 to 40 Ien
57–130V Input voltage Cortec code: P12-AAX---X
Pe> (*) 10xK W 800xK W 1xK W
Pe>> (*) 10xK W 800xK W 1xK W
220–480V Input voltage Cortec code: P12-ABX---X
Pe> (*) 40xK W 3200xK W 5xK W
Pe>> (*) 40xK W 3200xK W 5xK W
Pe> ? No or Yes
Delay Type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI,RI,
RECT curve)
tPe> 0s 150 s 0.01 s
Pe> TMS 0.025 1.5 0.025
Pe> Reset Delay Type DT or IDMT
Pe> RTMS 0.025 1.5 0.025
Pe> tReset 0.00 s 100 s 0.01 s
Pe>> ? No or Yes
tPe>> 0s 150 s 0.01 s
Pe>> tReset 0.00 s 100 s 0.01 s
High sensitivity IeCos Cortec code P12-C-X---X
IeCos> 0.002 Ien 1 Ien 0.001 Ien
IeCos>> 0.002 Ien 1 Ien 0.001 Ien
Med. sensitivity IeCos Cortec code P12-B-X---X
IeCos> 0.01 Ien 8 Ien 0.005 Ien
IeCos>> 0.01 Ien 8 Ien 0.005 Ien
Low sensitivity IeCos Cortec code P12-A-X---X
IeCos> 0.1 Ien 25 Ien 0.01 Ien
IeCos>> 0.5 Ien 40 Ien 0.01 Ien
IeCos> ? Yes or No
Delay Type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tIeCos> 0s 150 s 0.01 s
IeCos> TMS 0.025 1.5 0.025
IeCos> Reset Delay Type DT or IDMT
IeCos> RTMS 0.025 1.5 0.025
IeCos> tReset 0.00 s 100 s 0.01 s
P12y/EN TD/E95 Technical Data

Page 24/46 MiCOM P125/P126 & P127

Setting range
[32N] Earth Wattmetric
Min Max Step
IeCos>> ? Yes or No
tIeCos>> 0s 150 s 0.01 s
IeCos> tReset 0.00 s 100 s 0.01 s
Pe/IeCos Torque angle 0° 359° 1°

10.5 Undercurrent Protection (P126 & P127)

− Undercurrent

− Phase current: Fundamental only

10.5.1 Protection Setting Ranges

Setting ranges
[37] Undercurrent
Min Max Step
I< ? Yes or No
I< 0.1 In 1 In 0.01 In
tI< 0s 150 s 0.01 s
I< Inhibited on 52A Yes or No
I< inhibited on U< Yes or No
I< inhibited on U< Yes or No

10.6 Negative Sequence Overcurrent Protection (P126 & P127)

− Phase current: Fundamental only

NOTE: When I2> is associated to an IDMT curve, the maximum setting
recommended should be 2In.
10.6.1 Protection Setting Ranges

Setting ranges
[46] Neg.Seq. OC
Min Max Step
I2> ? No or Yes
I2> 0.1 In 25 In 0.01 In
Delay Type DT or IDMT (IEC_STI, IEC_SI,
IEC_VI, IEC_EI, IEC_LTI, C02, C08,
IEEE_MI, IIEEE_VI, IEEE_EI, RI,
RECT curve)
tI2> 0s 150s 0.01s
I2> TMS 0.025 1.5 0.025
I2> Reset Delay Type DT or IDMT
I2> RTMS 0.025 1.5 0.025
I2> tReset 0.04 s 100 s 0.01 s
I2>> ? No or Yes
I2>> 0.5 In 40 In 0.01 In
tI2>> 0s 150s 0.01s
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 25/46

Setting ranges
[46] Neg.Seq. OC
Min Max Step
I2>>> ? No or Yes
I2>>> 0.5 In 40 In 0.01 In
tI2>>> 0s 150s 0.01s

10.7 Thermal Overload Protection (P126 & P127)

− Phase Current: RMS

10.7.1 Protection Setting Ranges

Setting range
[49] Therm. OL
Min Max Step
Therm. OL ? No or Yes
Iθ 0.1 In 3.2 In 0.01
Te 1 mn 200 mn 1mn
k 1 1,5 0.01
θ Trip 50% 200% 1%
θ Alarm ? No or Yes
θ Alarm 50% 200% 1%

10.8 Undervoltage Protection (P127)

− Phase or phase to phase voltage Fundamental only

− Thresholds selection mode AND or OR (*)

10.8.1 Protection Setting Ranges (P127)

Setting ranges
[27] Phase Undervoltage
Min Max Step
57–130V Input voltage Cortec code: P127-AX---X
U< ? No or AND or OR
U< 2V 130 V 0.1 V
tU< 0s 600 s 0.01 s
52a Inhib. U< ? Yes or No
U<< ? No or AND or OR
U<< 2V 130 V 0.1 V
tU<< 0s 600 s 0.01 s
52a Inhib. U<< ? Yes or No
220–480V Input voltage. Cortec code: P127-BX---X
U< ? No or AND or OR
U< 10 V 480 V 0.5 V
tU< 0s 600 s 0.01 s
52a Inhib. U< ? Yes or No
P12y/EN TD/E95 Technical Data

Page 26/46 MiCOM P125/P126 & P127

Setting ranges
[27] Phase Undervoltage
Min Max Step
U<< ? No or AND or OR
U<< 10 V 480 V 0.5 V
tU<< 0s 600 s 0.01 s
52a Inhib. U<< ? Yes or No

10.9 Overvoltage Protection (P127)

− Phase or phase to phase voltage Fundamental only

− Thresholds selection mode AND or OR (*)

10.9.1 Protection Setting Ranges (P127)

Setting ranges
[59] Phase Overvoltage
Min Max Step
57–130V Input voltage Cortec code: P127-AX---X
U> ? No or AND or OR
U> 2V 260 V 0.1 V
tU> 0s 260 s 0.01 s
U>> ? No or AND or OR
U>> 2V 260 V 0.1 V
tU>> 0s 600 s 0.01 s
220–480V Input voltage. Cortec code: P127-BX---X
U> ? No or AND or OR
U> 10 V 960 V 0.5 V
tU> 0s 600 s 0.01 s
U>> ? No or AND or OR
U>> 10 V 960 V 0.5 V
tU>> 0s 600 s 0.01 s

(*) OR trip caused by one or two or three phase values exceeding the threshold.
AND trip caused by three phase values exceeding the threshold.
10.10 Under/over frequency Function (P127)

− Phase or phase to phase voltage Fundamental only

10.10.1 Protection Setting Ranges (P127)

Setting ranges
OP PARAMETERS
Min Max Step
Frequency 50 Hz 60 Hz N.A
[81] Frequency Min Max Step
F1? 81> or 81< or No
F1 45,1 Hz 64,9 Hz 0.01 Hz
tF1 0s 600 s 0.01 s
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 27/46

Setting ranges
OP PARAMETERS
Min Max Step
F2? 81> or 81< or No
F2 45,1 Hz 64,9 Hz 0.01 Hz
tF2 0s 600 s 0.01 s
F3? 81> or 81< or No
F3 45,1 Hz 64,9 Hz 0.01 Hz
tF3 0s 600 s 0.01 s
F4? 81> or 81< or No
F4 45,1 Hz 64,9 Hz 0.01 Hz
tF4 0s 600 s 0.01 s
F5? 81> or 81< or No
F5 45,1 Hz 64,9 Hz 0.01 Hz
tF5 0s 600 s 0.01 s
F6? 81> or 81< or No
F6 45,1 Hz 64,9 Hz 0.01 Hz
tF6 0s 600 s 0.01 s

10.10.2 Rate of change of frequency (P127)

Setting ranges
OP PARAMETERS
Min Max Step
dF/dt1 ? Yes or No
dF/dt1 –10Hz/s +10Hz/s 0.1Hz/s
dF/dt2 ? Yes or No
dF/dt2 –10Hz/s +10Hz/s 0.1Hz/s
dF/dt3 ? Yes or No
dF/dt3 –10Hz/s +10Hz/s 0.1Hz/s
dF/dt4 ? Yes or No
dF/dt4 –10Hz/s +10Hz/s 0.1Hz/s
dF/dt5 ? Yes or No
dF/dt5 –10Hz/s +10Hz/s 0.1Hz/s
dF/dt6 ? Yes or No
dF/dt6 –10Hz/s +10Hz/s 0.1Hz/s

10.11 Directional power Function (P127)

− Phase or phase to phase voltage Fundamental only

Power protection:

− Active overpower (two thresholds P> and P>>),

− Reactive Overpower (two thresholds Q> and Q>>),

− Active Underpower (two thresholds P< and P<<),

− Reactive Underpower (two thresholds Q< and Q<<).

P12y/EN TD/E95 Technical Data

Page 28/46 MiCOM P125/P126 & P127

10.11.1 Protection Setting Ranges

Setting ranges
[32] Directional Power
Min Max Step
57–130V Input voltage Cortec code: P127AA or P127BA or P127CA
“P>?” or “Q>?” or “P<?” or “Q<?” Yes or No
P> or Q> or P< or Q< 1 W*k (*) 10000 W*k (*) 1 W*k (*)
Directional angle 0° 359° 1°
tP> or tQ> or tP< or tQ< 0s 150 s 0.01 s
“P>>?” or “Q>>?” or “P<<?” or “Q<<?” Yes or No
P>> or Q>> or P<< or Q<< 1 W*k (*) 10000 W*k (*) 1 W*k (*)
Directional angle 0° 359° 1°
tP>> or tQ>> or tP<< or tQ<< 0s 150 s 0.01 s
220–480V Input voltage Cortec code: P127AB or P127BA or P127CA
“P>?” or “Q>?” or “P<?” or “Q<?” Yes or No
P> or Q> or P< or Q< 4 W*k (*) 40000 W*k (*) 1 W*k (*)
Directional angle 0° 359° 1°
tP> or tQ> or tP< or tQ< 0s 150 s 0.01 s
“P>>?” or “Q>>?” or “P<<?” or “Q<<?” Yes or No
P>> or Q>> or P<< or Q<< 4 W*k (*) 40000 W*k (*) 1 W*k (*)
Directional angle 0° 359° 1°
tP>> or tQ>> or tP<< or tQ<< 0s 150 s 0.01 s

(*) k = 1 if TC secondary ration = 1A

k = 5 if TC secondary ration = 5A
10.12 Residual Overvoltage Protection

− Residual voltage: Fundamental only

10.12.1 Protection Setting Ranges

Setting range
[59] Residual Overvoltage
Min Max Step
57–130V Input voltage. Cortec code: P127-AX---X
Ue>>>> ? No or Yes
Ue>>>> 1V 260 V 0.1 V
tUe>>>> 0s 600 s 0.01 s
220–480V Input voltage. Cortec code: P127-BX---X
Ue>>>> ? No or Yes
Ue>>>> 5V 960 V 0.5 V
tUe>>>> 0s 600 s 0.01 s
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 29/46

ATTENTION: THE Ue THRESHOLD SETTINGS DEPEND ON THE ADOPTED

CONNECTION OPTION. IN CONFIGURATION/GENERAL OPTIONS
MENU OF THE P127 RELAY THE Ve INPUT CAN BE SET DIRECTLY
FROM A VT (I.E. FROM A DELTA VT) OR CAN BE DERIVED FROM THE
MEASUREMENT OF THE THREE PHASE TO NEUTRAL VOLTAGES
(3VPN). IN THIS CASE THE Ue IS CALCULATED AS:

1
Ue = x(UA + UB + UC)
3
THE SETTING OF THE Ue THRESHOLDS MUST TAKE THE ABOVE
FORMULA IN ACCOUNT.
10.13 Multishot Autoreclose Function (P126 & P127)
Main shots: 4 independent shots.
External logic inputs: 6 inputs (CB opened signal, CB closed signal, manual opening
command, manual closing command, blocking order, cycle activation).
Internal programmable trigger from phase and earth fault on all re-closing cycles.
External trigger from logic input.
Inhibit time on manual closing.
Programmable dead times and reclaim time setting.
Maximum CB closing control equal to 5s (+t_Pulse setting).
10.13.1 Multishot Autoreclose Settings

Setting range
[79] Autoreclose
Min Max Step
Autoreclose ? Yes or No
Ext. CB Fail ? Yes or No
Ext. CB Fail time 0.01 s 600 s 0.01 s
Aux1 ((I>) ? Yes or No
Aux2 (Ie>) ? Yes or No
Ext Block ? Yes or No
Rolling Demand Yes or No
Max cycles nb 2 100 1
Time period 10mn 24h 10mn
Dead time
tD1 0.01 s 300 s 0.01 s
tD2 0.01 s 300 s 0.01 s
tD3 0.01 s 600 s 0.01 s
tD4 0.01 s 600 s 0.01 s
tI> 0.05 s 600 s 0.01 s
tI>> 0.05 s 600 s 0.01 s
tI>>> 0.05 s 600 s 0.01 s
tIe> 0.05 s 600 s 0.01 s
tIe>> 0.05 s 600 s 0.01 s
tIe>>> 0.05 s 600 s 0.01 s
Reclaim time
tR 0.02 s 600 s 0.01 s
Inhib time
P12y/EN TD/E95 Technical Data

Page 30/46 MiCOM P125/P126 & P127

Setting range
[79] Autoreclose
Min Max Step
tI 0.02 s 600 s 0.01 s
Phase Cycles 0 4 1
E/Gnd Cycles 0 4 1
Cycles 4321 Settings
tI> 1111 0 or 1 or 2
tI>> 1111 0 or 1 or 2
tI>>> 1111 0 or 1 or 2
tIe> 1111 0 or 1 or 2
tIe>> 1111 0 or 1 or 2
tIe>>> 1111 0 or 1 or 2
tPe/Iecos> 1111 0 or 1 or 2
tPe/Iecos>> 1111 0 or 1 or 2
tAux1 1111 0 or 1 or 2
tAux2 1111 0 or 1 or 2
With:
0 = no action on autorecloser: definitive trip
1 = trip on pick up of the protection element, followed by reclosing cycle
2 = no trip on pick up of the protection element also if this has been set in the CRTL/Trip
commands/Trip menu
10.13.2 Further timing
Fixed time out for lacking of CB opening signal on trip protection: 2.00 s at 50 Hz
1.67 s at 60 Hz
Time out for lacking of CB closing signal on close control after dead time:
tClose Pulse(*): from 0.1 to 5.00 s in steps of 0.01 s
(*) Setting available in CB monitoring menu.
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 31/46

11. AUTOMATION CONTROL FUNCTIONS

11.1 Trip commands
Assignation of the following thresholds to trip output relays:

− all models: tIe>, tIe>>, tIe>>>, tPe/IeCos>, tPe/IeCos>> , tUe>>>>, tAux 1, tAux 2, tAux
3, tAux 4, Ctrl Trip,

− P126 and P127 only, tI> , tI>> , tI>>> , tI2>, tI2>>, tI2>>>, Thermal θ, Brkn. Cond ,
SOTF, tEQUATION A, tEQUATION B, tEQUATION C ,t EQUATION D , tEQUATION E ,
tEQUATION F, tEQUATION G, tEQUATION H,

− P127 only: tIe>>>>, tP>, tP>>, tU>, tU>>, tU<, tU<<, tF1, tF2 , tF3 , tF4 , tF5 , tF6 ,
dF/dt1, dF/dt2, dF/dt3, dF/dt4, dF/dt5, dF/dt6, tAux 5, tAux 6, tAux 7, tAux 8, tAux 9,
tAux A, tAux B, tAux C.
11.2 Latch relays
Number of relay settable:

P125 P126 P127

6 8 8

11.3 Blocking logic

Possibility to block the following delayed thresholds:

− all models: tIe>, tIe>>, tIe>>>, tPe/IeCos>, tPe/IeCos>>, tUe>>>>, tAux1, tAux2, tAux3,
tAux4,

− P126 and P127: tI>, tI>>, tI>>>, tI2>, tI2>>, tI2>>>, tThermal θ, tI<, tBrk. Cond,

− P127: tIe>>>>, tP>, tP>>, tP<, tP<<, tQ>, tQ>>, tQ<, tQ<<, tU>, tU>>, tU<, tU<<, tF1 ,
tF2 , tF3 , tF4 , tF5 , tF6 , dF/dt1, dF/dt2, dF/dt3, dF/dt4, dF/dt5, dF/dt6, tAux5, tAux6,
tAux7, tAux8, tAux9, tAuxA, tAuxB, tAuxC.

11.4 Inrush blocking Logic (P127)

Setting range
Inrush Block
Min Max Step
Inrush Block Yes or No
Inrush H2 ration 10 % 35 % 0,1 %
Inrush tReset 0 ms 2s 0,1 s
Block I> No Yes Yes or No
Block I>> No Yes Yes or No
Block I>>> No Yes Yes or No
Block Ie> No Yes Yes or No
Block Ie>> No Yes Yes or No
Block Ie>>> No Yes Yes or No
Block I2> No Yes Yes or No
Block I2>> No Yes Yes or No
Block I2>>> No Yes Yes or No
Block Ie>>>> No Yes Yes or No
P12y/EN TD/E95 Technical Data

Page 32/46 MiCOM P125/P126 & P127

11.5 Logic select

Logic selectivity 1 and logic selectivity 2: this function is used to assign each time delay to
threshold to the “Log Sel” input.

Setting range
Blocking Inrush
Min Max Step
Sel1 tI>> Yes or No
Sel1 tI>>> Yes or No
Sel1 tIe>> Yes or No
Sel1 tIe>>> Yes or No
Sel1 tIe>>>> Yes or No
Sel1 tIe>>>> Yes or No
T Sel1 0s 150s 10ms

11.6 Output relays

Alarm and trip threshold assignation to a logic output: 6 relays (P125), 8 relays (P126 and
P127).
Assignable functions:

− all models: Ie>, tIe>, Ie_R>, Ie>>, tIe>>, Ie_R>>, Ie>>>, tIe>>>, Ie_R>>>, Pe/IeCos>,
tPe/IeCos>, Pe/IeCos>>, tPe/IeCos>>, Ue>>>>, tUe>>>>, tAux1, tAux2, tAux3, tAux4,
CONTROLTRIP, CONTROLCLOSE, ActiveGroup, Input1, Input2, Input3:, Input4,

− P126 and P127: Trip, I>, tI>, I_R>, I>>, tI>>, I_R>>, I>>>, tI>>>, I_R>>>, tIA>, tIB>,
tIC>, I2>, tI2>, I2>>, tI2>>, I2>>>, tI2>>>, ThermAlarm, ThermTrip, I<, tI<, BrknCond,
CBAlarm, 52 Fail, CBFail , CB Close , 79 Run, 79 Trip, SOTF, Input5, Input6, Input7,
t EQU.A, t EQU.B, t EQU.C, t EQU.D, t EQU.E, t EQU.F, t EQU.G, t EQU.H, 79 int.
Lock, 79 Ext Lock,

− P127: Ie>>>>, tIe>>>>, P>, tP>, P>>, tP>>, U>, tU>, U>>, tU>>, U<, tU<, U<<, tU<<,
F1, tF1, F2, tF2, F3, tF3, F4, tF4, F5, tF5, F6, tF6, dF/dt1, dF/dt2, dF/dt3, dF/dt4,
dF/dt5, dF/dt6, F.OUT, tAux5, tAux6, tAux7, tAux8, tAux9, tAuxA, tAuxB, tAuxC, VTS,
CTS, Command1, Command2, Command3, Command4.
11.7 Inputs
11.7.1 Inputs assignation
Single function or multiple automation functions assignable to 4 (P125) or 7 (P126 and P127)
logic inputs:

− all models: None, Unlatch, Blk Log 1, Aux 1, Aux 2, Aux 3, Aux 4, Maint. M, Man.
Close, Local, Synchronisation, LED Reset (or reset LED),

− P126 and P127: Blk Log 2, 52 a, 52 b, CB FLT, θ Reset, Change set, Log Sel 2, Cold
L PU, Strt Dist, Block_79, Trip Circ, Start t BF, Ctrl Trip, Ctrl Close,

− P127: Aux 5, Aux 6, Aux 7, Aux 8, Aux 9, Aux A, Aux B, Aux C, Log Sel 1.
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 33/46

11.7.2 Auxiliary Timers (P126 & P127)

Auxiliary timers: Up to 12 assigned to the logic inputs Aux1, Aux2, Aux3,
Aux4
+ optional auxiliary timers Aux5, Aux6, Aux7, Aux8 Aux9,
AuxA, AubB and AuxC

Setting range
Auxiliary timers
Min Max Step
tAux1 0 200 s 0.01 s
tAux2 0 200 s 0.01 s
tAux3 0 200 s 0.01 s
tAux4 0 200 s 0.01 s
tAux5 0 200 s 0.01 s
tAux6 0 200 s 0.01 s
tAux7 0 20000 s 0.01 s
tAux8 0 20000 s 0.01 s
tAux9 0 20000 s 0.01 s
tAuxA (tAux10) 0 200 s 0.01 s
tAuxB (tAux11) 0 200 s 0.01 s
tAuxC (tAux12) 0 200 s 0.01 s

11.8 Broken Conductor Detection (P126 & P127)

Principle used: I2/I1
Functionality available for: (IA or IB or IC) > 10% In
11.8.1 Broken conductor detection setting range

Setting range
Broken Conductor
Min Max Step
Brkn.Cond ? Yes or No
Ratio I2/I1 20% 100% 1%
Brkn.Cond Time tBC 1s 14400s 1s

11.9 Cold Load Pickup (P126 & P127)

Setting range
Cold Load PU
Min Max Step
Cold Load PU ? Yes or No
Input? Yes or No
Auto? Yes or No
Cold Load pickup activable with: tI>, tI>>, tI>>>, tIe>, tIe>>, tIe>>>,
tIe>>>>, tI2>, tI2>>, tI2>>> and/or tTherm
Cold Load PU level 20% 800% 1%
tCL 0.1s 3600s 0.1s
P12y/EN TD/E95 Technical Data

Page 34/46 MiCOM P125/P126 & P127

11.10 51V function (P127)

The 51V function means the control of the overcurrent elements by the monitoring of the
phase voltage; !The settings involved are listed below. The VTS function can also block the
51V.

Setting range
51V
Min Max Step
Voltage range 57-130V
(U<OR V2>) & I>> Yes or No
V2> 3V 200V 0.1V
(U<<OR V2>>) & I>>> Yes or No
V2> 3V 200V 0.1V
Voltage range 220-480V
(U<OR V2>) & I>> Yes or No
V2> 20V 720V 0.5V
(U<<OR V2>>) & I>>> Yes or No
V2> 20V 720V 0.5V
VTS Blocks 51V Yes or No
VTS Alarm Yes or No

11.11 VT Supervision (P127 only)

11.11.1 VT Supervision Setting range

Setting range
VT Supervision
Min Max Step
VTS? Yes or No
VTS Alarm Yes or No
VTS Blocks 51V Yes or No
VTS Blocks protection ? Yes or No
VTS Non Dir I>, I>>, I>>>, Ie>, Yes or No
Ie>>, Ie>>> and/or Ie>>>>
tVTS 0s 100s 10ms

11.12 CT Supervision (P127)

11.12.1 CT Supervision Setting range

Setting range
CT Supervision
Min Max Step
CT Supervision Yes or No
Ie> 0.08 × In 1.0 × In 0.01 × In
Ue< (P127xA) 0.5V 22V 0.1V
Ue< (P127xB) 2V 88V 0.5V
tCTS 0s 100s 0.01s
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 35/46

11.13 Circuit Breaker Failure (P126 & P127)

11.13.1 Circuit Breaker Failure Setting range

Setting range
CB Fail
Min Max Step
CB Fail ? Yes or No
I< BF 0.02 In 1In 0.01 In
CB Fail Time tBF 0s 10 s 0.01 s
Block I> Yes or No
Block Ie> Yes or No

11.14 Trip Circuit Supervision (P126 & P127)

11.14.1 Trip Circuit Supervision Setting range

Setting range
TC Supervision
Min Max Step
TC Supervision ? Yes or No
t trip circuit tSUP 0.1 s 10 s 0.01 s

11.15 Circuit Breaker Control and Monitoring (P126 & P127)

11.15.1 Setting Ranges

CB Supervision Setting range

Min Max Step
CB Open S’vision? Yes or No
CB Open time 0.05 s 1s 0.01 s
CB Close S’vision? Yes or No
CB Close time 0.05 s 1s 0.01 s
CB Open Alarm ? Yes or No
CB Open NB 0 50000 1
ΣAmps(n) ? Yes or No
ΣAmps(n) 0 E6 A 4000 E6 A 1E6 A
n 1 2 1
tOpen Pulse(*) 0.10 s 5s 0.01 s
tClose Pulse(*) 0.10 s 5s 0.01 s

(*) Note: The tOpen/Close Pulse is available in the P125 for the Local /Remote functionality.
P12y/EN TD/E95 Technical Data

Page 36/46 MiCOM P125/P126 & P127

11.16 SOTF/TOR Switch on to fault / Trip on reclose (P126 & P127)

11.16.1 Setting Ranges

Setting range
SOTF
Min Max Step
SOTF? Yes or No
t SOTF 0 ms 500 ms 10ms
I>> Yes or No
I>>> Yes or No
Ctrl close input Yes or No
SOTF input Yes or No
HMI closing order Yes or No
[79] closing Yes or No
Front comm. order Yes or No
Rear comm. order Yes or No
Rear2 comm. order Yes or No

11.17 Logic Equation (P126 & P127)

The MiCOM P126 and P127 relays integrate complete logic equations to allow customization
of the product based on customer application.
Up to 8 independent Boolean equations can be used (from A to H). Every result of equation
can be time delayed and assigned to any output relays, trip, trip latching and/or HMI LEDs.
Up to 16 operands can be used (from 00 to 15). Within operands, there are two parts:
- (1/2) : logical gates (NOT, OR, AND, NOT AND, NOT OR)
- (2/2) : signals (I>, tI>>, Input1 …etc)
11.17.1 Timer Setting Ranges

logic equat Setting range

T delay Min Max Step
EQU. A Toperat 0s 600 s 0.01 s
EQU. A Treset 0s 600 s 0.01 s
EQU. B Toperat 0s 600 s 0.01 s
EQU. B Treset 0s 600 s 0.01 s
EQU. C Toperat 0s 600 s 0.01 s
EQU. C Treset 0s 600 s 0.01 s
EQU. D Toperat 0s 600 s 0.01 s
EQU. D Treset 0s 600 s 0.01 s
EQU. E Toperat 0s 600 s 0.01 s
EQU. E Treset 0s 600 s 0.01 s
EQU. F Toperat 0s 600 s 0.01 s
EQU. F Treset 0s 600 s 0.01 s
EQU. G Toperat 0s 600 s 0.01 s
EQU. G Treset 0s 600 s 0.01 s
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 37/46

logic equat Setting range

T delay Min Max Step
EQU. H Toperat 0s 600 s 0.01 s
EQU. H Treset 0s 600 s 0.01 s

11.17.2 Available logical gates

Logical gates Availability (1/2)

NOT A00
B00
C00
D00
E00
F00
G00
H00
OR (by default) A01 to A15
B01 to B15
AND
C01 to C15
AND NOT D01 to D15
E01 to E15
OR NOT
F01 to F15
G01 to G15
H01 to H15

11.17.3 Available signals

With the Logic Equations submenu, 16 operands can be used in any single equation. The
following logic signals are available for mapping to an equation:

TEXT Signals (2/2)

I>, I> and I>> Instantaneous first, second and third phase overcurrent
thresholds
tI>, tI>> and tI>>> Time delayed first, second and third phase overcurrent
thresholds
Ie>, Ie>> and Ie>>> Instantaneous first, second and third earth overcurrent
thresholds
tIe>, tIe>> and tIe>>> Time delayed first, second and third earth overcurrent
thresholds
Pe>, Pe>> First and second earth wattmetric alarm thresholds
tPe>, tPe>> Time delayed first and second earth wattmetric trip thresholds
t Aux 1 to t Aux 4 Copy of the status of the Logic Input delayed by tAux1, tAux2,
tAux3 and tAux4 times
t Aux 5 to t Aux C (when Copy of the status of the Logic Input delayed by tAux5, tAux6,
available) tAux7, tAux8, tAux9, tAuxA, tAuxB and tAuxC times
I2>, I2>> and I2>>> Instantaneous first, second and third phase negative
sequence thresholds
tI2>, tI2>> and tI2>>> Time delayed negative phase sequence (1st, 2nd and 3rd
threshold)
θ Alarm Thermal alarm output signal
θ Trip Trip on Thermal overload
I< Instantaneous undercurrent threshold
tI< Time delayed undercurrent
P12y/EN TD/E95 Technical Data

Page 38/46 MiCOM P125/P126 & P127

TEXT Signals (2/2)

tBC Time delayed broken conductor
U>, U>> Instantaneous first and second overvoltage threshold (P127)
tU>, tU>> Time delayed first and second overvoltage threshold (P127)
U<, U<< Instantaneous first and second undervoltage threshold (P127)
tU<, tU<< Time delayed first and second undervoltage threshold (P127)
Ue>>>> Instantaneous threshold for residual overvoltage
tUe>>>> Time delayed trip threshold for residual overvoltage
tBC Time delayed broken conductor
79 Trip Autoreclose final trip
Input 1 to Input C (when Opto input 1 to opto input C.
available)
P>, P>> Instaneous first and second active overpower trip threshold
(P127)
tP>, tP>> Time delayed first and second active overpower trip threshold
(P127)
P<, P<< Instaneous first and second active underpower trip threshold
(P127)
tP<, tP<< Time delayed first and second active underpower trip
threshold (P127)
Q>, Q>> Instaneous first and second reactive overpower trip threshold
(P127)
tQ>, tQ>> Time delayed first and second reactive overpower trip
threshold (P127)
Q<, Q<< Instaneous first and second reactive underpower trip
threshold (P127)
tQ<, tQ<< Time delayed first and second reactive underpower trip
threshold (P127)
F1 to F6 Instantaneous first, second, third, fourth, fifth and sixth
frequency trip threshold (P127)
tF1 to tF6 Time delayed first, second, third, fourth, fifth and sixth
frequency trip threshold (P127)
dF/dt1 to dF/dt6 1st to 6th rates of change of frequency
VTS Instantaneous VTS output signal (P127)
CTS Instantaneous Current Transformer Supervision signal (P127)
Ie>>>> Derived earth overcurrent threshold
tIe>>>> Time delayed threshold of derived earth overcurrent threshold
79 i. Lock Autoreclose lock activated by the internal process of the
autoreclose (Internal Blocking)
79 e. Lock Autoreclose lock activated by the input “block 79” (External
Blocking)
tEQU. A to tEQU. H Results of equations A to H.
CB Fail Circuit Breaker failure
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 39/46

11.18 Communication order delay

The following delay times set the duration for the reception of the remote “communication
order” signals.

logic equat Setting range

T delay Min Max Step
tCommand 1 0s 600s 50ms
tCommand 2 0s 600s 50ms
tCommand 3 0s 600s 50ms
tCommand 4 0s 600s 50ms
P12y/EN TD/E95 Technical Data

Page 40/46 MiCOM P125/P126 & P127

12. RECORDING FUNCTIONS (P126 & P127)

12.1 Event Records

Capacity 250 events

Time-tag 1 millisecond
Triggers Any selected protection alarm and threshold
Logic input change of state
Setting changes
Self test events

12.2 Fault Records

Capacity 25 faults
Time-tag 1 millisecond
Triggers Any selected protection alarm and threshold
Data Fault date
Protection thresholds
Setting Group
AC inputs measurements (RMS)
Fault measurements

12.3 Instantaneous recorder

Capacity 5 starting informations (instantaneous)

Time-tag 1 millisecond
Triggers Any selected protection alarm and threshold
Data date, hour
origin (any protection alarm)
length (duration of the instantaneous trip yes or no

12.4 Disturbance Records

12.4.1 Triggers; Data; Setting Ranges

Disturbance Records
Triggers Any selected protection alarm and threshold, logic input, remote
command
Data AC input channels
digital input and output states
frequency value
Default value Setting range
Min Max Step
Records number 5 1 5 1
Pre-Time 0.1s 0.1 2.9 / 4.9 / 0.1
6.9 or 8.9
Disturb rec Trig ON TRIP ON TRIP or ON INST.
Trigger Any selected protection alarm and threshold
Logic input
Remote command
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 41/46

13. COMMUNICATION
Type Relay
Physical Link Connectors Data Rate Protocol
Port position
RS485 Rear port Screened twister Screws or 300 to 38400 baud ModBus RTU, ,
pair snap-on (programmable) IEC60870-5-103, DNP3
RS485 Optional 2nd Screened twister Screws or 300 to 38400 baud ModBus RTU,
isolated rear port pair snap-on (programmable) IEC60870-5-103 (option)
RS232 Front port Screened twister Sub–D 9 pin 300 to 38400 baud ModBus RTU
pair female (programmable)
connector
P12y/EN TD/E95 Technical Data

Page 42/46 MiCOM P125/P126 & P127

14. IRIG-B INTERFACE

The IRIG-B is a P127 optional interface used to receive synchronization signal from a GPS
clock.
Type: Modulated (1kHz) or demodulated
Interface:

− Modulated IRIG-B interface:

• BNC socket and BNC adaptor

• total impedance: 50Ω

− No modulated IRIG-B interface: screw,

SELV rated circuit
Date code: BCD
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 43/46

15. CURVES
15.1 General
Although the curves tend towards infinite when the current approaches Is (general
threshold), the minimum guaranteed value of the operating current for all the curves with the
inverse time characteristic is 1.1Is (with a tolerance of ± 0.05Is).
15.1.1 Inverse Time Curves:
The first stage thresholds for phase (earth) overcurrent can be selected with an inverse
definite minimum time (IDMT) characteristic. The time delay is calculated with a
mathematical formula.
In all, there are eleven IDMT characteristics available.
The mathematical formula applicable to the first ten curves is:

⎛ K ⎞
t = T ×⎜ + L⎟
⎜ (I I S ) − 1
α ⎟
⎝ ⎠
Where:
t Operation time
K Factor (see table)
I Value of measured current
Is Value of the programmed threshold (pick-up value)
α Factor (see table)
L ANSI/IEEE constant (zero for IEC and RECT curves)
T Time multiplier setting from 0.025 to 1.5

Type of curve Standard K factor α factor L factor

Short time inverse Schneider 0.05 0.04 0
Electric
Standard inverse IEC 0.14 0.02 0
Very inverse IEC 13.5 1 0
Extremely inverse IEC 80 2 0
Long time inverse Schneider 120 1 0
Electric
Short time inverse C02 0.02394 0.02 0.01694
Moderately Inverse ANSI/IEEE 0.0515 0.02 0.114
Long time inverse C08 5.95 2 0.18
Very inverse ANSI/IEEE 19.61 2 0.491
Extremely inverse ANSI/IEEE 28.2 2 0.1217
Rectifier protection RECT 45900 5.6 0

The RI curve has the following definition:

1
t= K ⋅
0.236
0 .339 −
( )
I
Is
K setting is from 0.10 to 10 in steps of 0.05.
The equation is valid for 1.1 ≤ I/Is ≤ 20.
P12y/EN TD/E95 Technical Data

Page 44/46 MiCOM P125/P126 & P127

15.1.2 Reset Timer

The first stage thresholds for phase and earth overcurrent protection, negative sequence
overcurrent and wattmetric/IeCos are provided with a timer hold facility "t Reset".
It may be set to a definite time value or to an inverse definite minimum time characteristic
(IEEE/ANSI curves only). This may be useful in certain applications, for example when
grading with upstream electromechanical overcurrent relays that have inherent reset time
delays.
The second and third stage thresholds for the wattmetric/IeCos protection and earth fault
overcurrent protection only have a definite time reset.
A possible situation where the reset timer may be used is to reduce fault clearance times
where intermittent faults occur.
An example may occur in a cable with plastic insulation. In this application it is possible that
the fault energy melts the cable insulation, which then reseals after clearance, thereby
eliminating the cause for the fault. This process repeats itself to give a succession of fault
current pulses, each of increasing duration with reducing intervals between the pulses, until
the fault becomes permanent.
When the reset time of the overcurrent relay is set to minimum the P125, P126 and P127
relays will be repeatedly reset and will not be able to trip until the fault becomes permanent.
By using the reset timer hold function the relay will integrate the fault current pulses, thereby
reducing fault clearance time.
The mathematical formula applicable to the five curves is:
⎛ K ⎞
t = T ×⎜ ⎟
⎜ 1 − (I I S )α ⎟
⎝ ⎠
Where:
t Reset time
K Factor (see table)
I Value of the measured current
Is Value of the programmed threshold (pick-up value)

α Factor (see table)

T Reset time multiplier (RTMS) setting between 0.025 and 1.5

Type of curve Standard K factor α factor

Short time inverse C02 2.261 2
Moderately inverse ANSI/IEEE 4.850 2
Long time inverse C08 5.950 2
Very inverse ANSI/IEEE 21.600 2
Extremely Inverse ANSI/IEEE 29.100 2
Technical Data P12y/EN TD/E95

MiCOM P125/P126 & P127 Page 45/46

15.2 Thermal Overload Curves

The thermal time characteristic is given by:
⎛ −t ⎞

e⎝ τ
⎜⎜ ⎟⎟
⎠ =
(I ² − (kxIFLC )² )
(I ² − Ip ² )
Where:
t = Time to trip, following application of the overload current, I

τ = Heating and cooling time constant of the protected plant equipment

I = Largest phase current
IFLC = Full load current rating (relay setting 'Thermal Trip')
k = 1.05 constant, allows continuous operation up to < 1.05 IFLC
IP = Steady state pre-loading current before application of the overload
The time to trip varies depending on the load current carried before application of the
overload, i.e. whether the overload was applied from "hot" or "cold".
Curves of the thermal overload time characteristic are given in Technical Data.
The mathematical formula applicable to MiCOM Relays is the following:

⎛ K² - θ ⎞
t Trip = Te In ⎜⎜ ⎟
⎟
⎝ K ² − θtrip ⎠
Where:
t Trip = Time to trip (in seconds)
Te = Thermal time constant of the equipment to be protected (in seconds)

K = Thermal overload equal to Ieq/k Iθ> with:

Ieq = Equivalent current corresponding to the RMS value of the largest phase
current

Iθ> = Full load current rating given by the national standard or by the supplier
k = Factor associated to the thermal state formula

θ alarm = Initial thermal state. If the initial thermal state = 30% then θ =0.3

θ trip = Trip thermal state. If the trip thermal state is set at 100%, then θ trip = 1
The settings of these parameters are available in the various menus. The calculation of the
thermal state is given by the following formula:

²⎡ ⎛ −t ⎞ ⎤ ⎛ −t ⎞
⎛ Ieq ⎞ ⎜ ⎟ ⎜ ⎟
⎢1− e ⎝ Te ⎠ ⎥ + Θ τ e ⎝ Te ⎠
Θ τ +1 = ⎜ ⎟
⎝ kxIΘ > ⎠ ⎢
⎣
⎥
⎦
θ being calculated every 100ms.
P12y/EN TD/E95 Technical Data

Page 46/46 MiCOM P125/P126 & P127

BLANK PAGE
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127

GETTING STARTED
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 1/30

CONTENT

1. ENERGISING THE RELAY 3

1.1 System Connections 3
1.2 Auxiliary Power Supply Connections 3

2. USER INTERFACE AND MENU STRUCTURE 4

2.1 User interfaces and menu structure 4
2.1.1 “Default settings” alarm 4
2.1.2 Password protection 4
2.1.3 Setting the language 5
2.1.4 Setting Date and time 5
2.1.5 Menu navigation 5
2.2 Menu structure 6

3. LOCAL CONNECTION TO A PC 7
3.1 Configuration 7
3.1.1 REMOTE connection 7
3.2 Products plugged in the same panel 8
3.3 Communication between distant products 8
3.4 MiCOM S1 and MiCOM S1 Studio relay communications basics 9
3.5 MiCOM S1 Studio 9
3.5.1 Data Model Management 9
3.5.2 “Quick Connection” to the relay using MiCOM S1 Studio 12
3.5.3 Create a system 15
3.5.4 Create a new substation 16
3.5.5 Create a new voltage level 17
3.5.6 Create a new bay 17
3.5.7 Create a new device 18
3.5.8 Open Settings File 19
3.6 MiCOM S1 21
3.6.1 Starting MiCOM S1 21
3.6.2 Open communication link with relay 22
3.6.3 Off-line use of MiCOM S1 24
3.6.4 MiCOM monitoring 25
3.7 Presentation and analysis of disturbance 26

4. WITHDRAWING MODULE FROM CASE 27

5. COMPANY CONTACT INFORMATION 29

P12y/EN GS/E95 Getting Started

Page 2/30 MiCOM P125/P126 & P127

BLANK PAGE
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 3/30

1. ENERGISING THE RELAY

To energise the relay correctly, follow the following instructions carefully.
1.1 System Connections
1. Check the wiring scheme of your installation.
2. Check that the contacts of output relay RL1 are included in your trip circuit.
1.2 Auxiliary Power Supply Connections
Connect a DC or AC (according to nominal supply rating Ua) voltage power supply.
POSITIVE Vaux TO TERMINAL 33
NEGATIVE Vaux TO TERMINAL 34
DO NOT FORGET TO CONNECT THE EARTH REFERENCE TO
TERMINAL 29!
Turn on the auxiliary power supply and set to approximately rated voltage as shown on the
front panel of the relay.
The display should show:

IA Displays the A phase current (true RMS value) taking into

1.00 A account the phase CT ratio (CONFIGURATION/CT RATIO
submenu).

LEDs should be in the following configuration:

− Green LED L3 "Healthy" (Vaux) is illuminated.

− All the other LEDs should be off.

P12y/EN GS/E95 Getting Started

Page 4/30 MiCOM P125/P126 & P127

2. USER INTERFACE AND MENU STRUCTURE

Before carrying out any work on the equipment, the user should be familiar with the
contents of the safety section/safety guide SFTY/4LM/D11 or later issue, the technical
data section and the ratings on the equipment rating label.
Refer to “GETTING STARTED” (GS) section for the description of the following procedures
(interfaces and menu).
Before the initial operation of the relay, some of the parameter settings must be checked or
modified (otherwise, “Setting alarm” is displayed).
Lift the upper and lower hinged covers and remove the transparent cover over the front
panel. When the keypad is exposed, it provides full access to the menu options of the relay.
The relevant information is displayed on the LCD.

2.1 User interfaces and menu structure

The settings and functions of the MiCOM relay can be accessed both from the front panel
keypad and LCD, and via the front and rear communication ports. Information on each of
these methods is given in this section to describe how to start using the relay.
The front panel of the relay includes a keypad, a 16-character alphanumeric liquid crystal
display (LCD) and 8 LEDs.
2.1.1 “Default settings” alarm
When the relay is powered ON, it checks its memory contents. If the default settings are
loaded, an alarm is raised and The ALARM yellow LED lights up.
To suppress this message and to reset the watch dog, change one parameter in the relay's
menu:

− Press the  button,

− Modify, for instance, the password or the language (“OP parameters” menu.
2.1.2 Password protection
Password protection is applicable to most of the relay parameter settings, especially to the
selection of the various thresholds, time delays, communication parameters, allocation of
logic inputs and logic outputs.
The password consists of four capital characters. When leaving the factory, the password is
set to AAAA. The user can define any combination of four characters.
Should the password be lost or forgotten, the modification of stored parameters is blocked. It
is then necessary to contact the manufacturer or his agent and by specifying the serial
number of the relay, a stand-by password specific to the relay concerned may be obtained.
NOTE: The programming mode is indicated with the letter "P" on the right
hand side of the display on each menu heading. The letter "P"
remains present as long as the password is active (5 minutes if there
is no action on the keypad).

− Go to the “OP. Parameters” menu by pressing  and then to the “password” menu by
pressing ,

− Enter the current password (default password = “AAAA”) and validate with  (this
operation is not necessary if the password has been entered some minutes ago),

− Enter the new password character by character, using  and  arrows to change a
letter (maintain the key pressed to scroll through the letter in the alphabet). Use  and 
arrows to select another character: a flashing cursor will indicate which character field of
the password may be entered,

− Validate using  or cancel using . If the password is correct, the following message is
displayed on the LCD: PASSWORD OK.
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MiCOM P125/P126 & P127 Page 5/30

As soon as the password has been entered, no setting change will be accepted via the
remote or local communication port (RS485 or RS232).
Alternatively, the password can be entered by using the Password window in the
OP.PARAMETERS menu. This password entry procedure is the same as above.
NOTE: In case of loss of password a back up password can be provided
contacting Schneider Electric sale office or factory.
2.1.3 Setting the language

− Go to the “OP. Parameters” menu by pressing  and then to the “Language” menu by
pressing , ,

− If necessary, enter the current password and validate with ,

− Select the language using  or  arrows, and validate with ,

− Validate using  or cancel using .

2.1.4 Setting Date and time

NOTE: If the optional IRIG-B board is installed (P127 option), date and time
synchronization could be automatic.

− Go to the “OP. Parameters” menu by pressing  and then to the “Date” menu by
pressing  (x9),

− If necessary, enter the current password and validate with ,

− Set the date using  or  arrow, and validate with  (10/11/08 means November 10th
2008),
NOTE: When you modify the date, the first digit for the day or the month can
be selected according to the second digit. For instance, if 13/09/08 is
displayed, you cannot select 33 for the day, or 29 for the month.

− Validate using  or cancel using .

− Select the “Time ” menu by pressing 2 key,

− Set the date using  or  arrow, and validate with  (14:21:42 means 2:21:42 pm).

2.1.5 Menu navigation

A simple menu structure (refer to P12y/EN GS section) allows setting and reading of
parameters and functionality.
The keypad provides full access to the menu options, with informations displayed on the
LCD.

− Press , ,  and  keys for menu navigation:

• Press  or  keys to navigate from a menu heading to another menu heading (refer to
the figure below),

• Press  key to access to a sub menu, then navigate using  or  keys.

− Maintain these keys pressed to scroll through the menu.

− If necessary, modify a parameter by pressing  key:

• Modify the corresponding parameter using arrows,

• Validate using , or cancel using .

P12y/EN GS/E95 Getting Started

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2.2 Menu structure

The menu structure is shown below.

DEFAULT DISPLAY
IA = 1245 A

OP PARAMETERS ORDERS CONFIGURATION MEASUREMENTS METERING

or when
“Measurement” displayed

RECORDS AUTOMAT. CTRL PROTECTION Gx COMMUNICATION

G1/G2,
G3 to G8 (P127)

Refer to P12y/EN HI section for the detail of the menu.

Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 7/30

3. LOCAL CONNECTION TO A PC
3.1 Configuration

io
S1 Stud
MiCOM

P0107ENc

For a local connection between a PC and the relay, a serial cable with metallic shield should
be used.
The wiring of the RS232 cable must be as shown in the following drawing.

RS232 PC PORT MiCOM P125/6/7 end

9 pin male connector 9 pin female connector

P0073ENa

A USB/RS232 cable can also be used to communicate to the relay

3.1.1 REMOTE connection
The figure shows the recommended way to connect a RS485 cable to the relay to build a
local network.
P12y/EN GS/E95 Getting Started

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3.2 Products plugged in the same panel

Case earth connection

29
30
32 31

shield

RS485 cable

1. Connect a cable (green/yellow wire) on the case earth

connection of each product (with screw).
2. The communication cable shield must be connected
to the pin number 29 of each product.
3. The pin number 29 of each terminal block must be
connected to the case earth connection of each product
(with screw).

P0253ENa

3.3 Communication between distant products

EARTH

1. Connect a cable (green/yellow wire) on the case earth

connection of each product (with screw)
2. The communication cable shield must be connected to the pin
number 29 of each product .
3. The pin number 29 has to be connected to the case earth Earth
connection (with screw) to only ONE panel (do not leave the
cable shield "floating") P0254ENa
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 9/30

3.4 MiCOM S1 and MiCOM S1 Studio relay communications basics

MiCOM S1 and MiCOM S1 Studio are the universal MiCOM IED Support Softwares and
provide users a direct and convenient access to all stored data in any MiCOM IED using the
EIA(RS)232 front communication port.
MiCOM S1 Studio provide full access to MiCOM Px20, Px30, Px40 relays and others IED.
The following sections give the main procedures to connect and to use MiCOM S1 and
MiCOM S1 Studio.
Before starting, verify that the EIA(RS)232 serial cable is properly connected to the
EIA(RS)232 port on the front panel of the relay. Please follow the instructions in section 3.1
to ensure a proper connection is made between the PC and the relay before attempting to
communicate with the relay.
This section is intended as a quick start guide to using MiCOM S1 and MiCOM S1 Studio,
and assumes you have a copy of MiCOM S1 or MiCOM S1 Studio installed on your PC.
Please refer to the MiCOM S1 or MiCOM S1 Studio User Manual for more detailed
information.
3.5 MiCOM S1 Studio
3.5.1 Data Model Management
The settings and parameters of the protection relay can be extracted from the relay or
loaded using Data Model manager. The Data Model Manager can load any model from Local
file, CD ROM or Internet server (if connected).
The Data Model Manager is used to add or to remove data models, to export and to import
data model files.
It is necessary to close MiCOM S1 Studio when the Data Model Manager is opened.

To Open Data Model manager, click on the icon: , select " Schneider Electric "
then "Data Model Manager" in the "Programs" menu.

Schneider Electric
P12y/EN GS/E95 Getting Started

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The following panel is displayed:

Select the “Add” option to add the new data model then click on the “Next” button.
The next panel is used to select the model source (CD ROM, local folder or Schneider
Electric FTP server). Select the model source and click on the “next” button.

Schneider Electric FTP

1 2

NOTE: The following procedure is given with FTP server selected.

Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 11/30

The Data Model Manager loads data models details, and then displays automatically the
language selection option panel. Select the menu language(s) and click on the “Next” button.

The data models panel is displayed. Select the data model for your product (for instance, to
download P12x data models, open the “Px10/Px20/Px20C/M/Modulex” sub-menu (click on
“+” then select data model according to your product). When data models are selected, the
Data Model Manager panel displays the selected models size to download.

2
3
P12y/EN GS/E95 Getting Started

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Click on “Install button”. The model files are downloaded and updated in the system.

When installation has been completed, close the Data Model Manager. This Data Model is
used with MiCOM S1 Studio when a system is opened or created. To open this default
setting file, refer to § 3.5.8.

3.5.2 “Quick Connection” to the relay using MiCOM S1 Studio

To start MiCOM S1 Studio, click on the icon:

In the "Programs" menu, select " Schneider Electric" then "MiCOM S1 Studio".

Schneider Electric
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 13/30

The MiCOM S1 Studio launcher screen is displayed:

Toolbar

Studio Explorer & Start page

Properties views

Search results view

Click on the “Quick Connect” button at the top left of the application:

Create a new system (see § 3.5.3) or open an existing one:

When a system is opened (or created), the following “device type” window is displayed.
P12y/EN GS/E95 Getting Started

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Select “Px20 Series” from the presented options:

Select a port from the presented options:

Upon a successful connection, a dialog will be displayed showing device type, model
number and plant reference. Options for language, device name and comment are also
available.
The device is displayed in the Studio Explorer panel.
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MiCOM P125/P126 & P127 Page 15/30

3.5.3 Create a system

In MiCOM S1 Studio, a System provides a root node in the Studio Explorer from which all
subsequent nodes are created.
Substations, bays, voltage levels and devices are added to the system. If a system is no
longer needed, It can be deleted using the delete command.
The use of Quick Connect will automatically create a default system, if one does not already
exist. Systems are not opened automatically, unless “Reopen last System at start-up” is
selected in “Options / Preferences…” menu.
To create a new system:

− By default, the window displays the message “create new or open existing system”: click
on “new” to create a new system.

− If a system is loaded in the “Studio Explorer” window, right-click on the panel background
and select New System or select the corresponding icon on Studio Explorer's toolbar.

or

The following window is displayed: Enter the name of the system, and the path to save the
system file.
P12y/EN GS/E95 Getting Started

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The new System is displayed in the Studio Explorer panel:

NOTE: In the Studio Explorer panel, if an item is selected, its properties are
displayed in the “Properties” panel.

3.5.4 Create a new substation

Select the system: the menu bar is updated with “new device”, “new substation”, “close”,
“delete”, “paste”, “properties” and “options” icons.

Create a new substation

Create a new device

Click on “new substation” icon (or select the menu using right-click). The following window is
displayed:

The new substation is displayed and the menu bar is updated when a substation is selected.
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 17/30

Import SCL
Create a new voltage level

Click on “Import SCL” button to import a Substation Configuration File.

To create a substation configuration, click on “new voltage level” button.
3.5.5 Create a new voltage level
Select the substation and click on “new station level” button (or select the menu using right-
click).
In the “Create a new voltage level”, enter the voltage level of the station.
The “new voltage level” is displayed and the “new bay” icon is displayed.

Create new bay

3.5.6 Create a new bay

Select the substation and click on “new bay” button (or select the menu using right-click).
In the “Create new bay…” window, enter the bay indication,
Th new bay is displayed.
P12y/EN GS/E95 Getting Started

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3.5.7 Create a new device

Click on “new device” button (or select the menu using right-click).
Select the device type and, if necessary, the communications protocol mode that will be
used to send the file to the device.

1
2

Select the device type, click “Next” button.

Select the model and click “Next” button.

2 3

4
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 19/30

Enter the name and add a description of the device:

The new device is created and displayed.

3.5.8 Open Settings File

To open an existing file:

− If the file is saved or if the relay is not connected: open the Settings folder and open the
Settings file,

− If the relay is connected, extract the settings from the relay: click on the “Extract Settings”
command or right click on the Settings folder.

Extract Settings
P12y/EN GS/E95 Getting Started

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To open default settings:

− Click on “Open Default Settings File” Option in the File menu.

− Select the device type then the communication protocol.

− Select the device type and click on the “Next” button:

− Select the Model and click on the “Finish” button. The default settings are displayed.

2
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 21/30

3.6 MiCOM S1
3.6.1 Starting MiCOM S1

To start MiCOM S1 Studio, click on the icon: .

In the "Programs" menu, select "MiCOM S1" then "MiCOM S1".

WARNING: CLICKING ON "UNINSTALL MiCOM S1", WILL UNINSTALL MiCOM S1,

AND ALL DATA AND RECORDS USED IN MiCOM S1.
You access the MiCOM S1 launcher screen.

Schneider Electric
P12y/EN GS/E95 Getting Started

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− Select the Px20 product: If necessary, click on the blue arrows ( ).

Schneider Electric

Select the Setup button:

Schneider Electric

NOTE: Select the “User Manual” button to read “setting & records” and
“Measurement Viewer” description and operating procedures.

3.6.2 Open communication link with relay

To open the communications link from S1 to the relay, follow the following procedure.
First, if necessary, the communication setup must be adjusted. In the "Device" menu, select
"Communications Setup…"
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 23/30

This brings up the following screen:

COMMUNICATION SET-UP SCREEN

When the communications setup is correct, the link with the relay can be initialized. In the
"Device" menu, select "Open Connection…"

This brings up a prompt for the address of the relay to be interrogated.

When this has been entered, a prompt for the password appears.
When these have been entered satisfactorily the relay is then able to communicate with
MiCOM S1. When a communication link has been established between the PC and a
MiCOM IED, both are said to be online. Data and information can be directly transferred from
and to the IED using the menu available under the “DEVICE” menu.
P12y/EN GS/E95 Getting Started

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For further instruction on how to extract, download and modify settings files, please refer to
the MiCOM S1 User Manual.
Select the main function in the right hand window.
To modify a setting value, double click the corresponding line in the left hand window. It
opens a setting window.

A red star (∗) indicates that a setting value is modified.

2
3.6.3 Off-line use of MiCOM S1
As well as being used for the on-line editing of settings, MiCOM S1 can also be used as an
off-line tool to prepare settings without access to the relay. In order to open a default setting
file for modification, in the “File” menu, select “New” and then “Settings File…”
Getting Started P12y/EN GS/E95

MiCOM P125/P126 & P127 Page 25/30

This brings up a prompt for the relay model type where you can select the correct relay for
your application:

Clicking on “OK” will open the default file and you can start to edit settings. For further
instruction on how to extract, download and modify settings files, please refer to the MiCOM
S1 User Manual.
3.6.4 MiCOM monitoring
The monitoring module enables to connect to the front port, retrieve and monitor its
measurements.

Click on the monitoring button: .

Schneider Electric
On line

The monitoring module is displayed.

Use the “Device” menu to configure the communication:

The “Communications setup…” menu enables to select or to setup the communication

settings. The “Open Connection…” menu enables the PC to retrieve data from the online
device.
P12y/EN GS/E95 Getting Started

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3.7 Presentation and analysis of disturbance

The reading and analisys of disturbance is performed using Wavewin.
To open Wavewin with MiCOM S1:

− In the main page, select the function using the blue arrows ( ),

− Click on the “presentation and Analysis of Disturbance Recording Data with “Wavewin”
window.

Schneider
On-li

Schneider Electric
On-line

Using MiCOM S1 Studio, open Wavewin using “Tools” menu.

The Wavewin File Manager is displayed (refer to the Wavewin User’s guide to operate
Wavewin).
Getting Started P12y/EN GS/E95

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4. WITHDRAWING MODULE FROM CASE

Remove the top and bottom hinged covers:

Depose the four retaining screws in the top and the bottom side of the relay. These screws
retain the relay to the case.
P12y/EN GS/E95 Getting Started

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Insert a 3mm screwdriver into the hole situated under the upper hinged cover above the
LCD:

Turn the lock pin 90° to the left:

Insert the screwdriver into the second hole under the lower hinged cover, and the lower lock
pin is turned 90° to the right.
By this turning action, push slightly forward the
module and extract it by pulling on both sides of the
front panel.
Getting Started P12y/EN GS/E95

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5. COMPANY CONTACT INFORMATION

If you need information pertaining to the operation of this MiCOM product that you have
purchased, please contact your local Schneider Electric agent or the Worldwide Contact
Centre of Schneider Electric. Do not forget to give the serial number and reference of the
MiCOM product.
The MiCOM product reference and serial numbers are documented under the upper hinged
cover on the front of the relay. For more precise information, refer to the section "Relay
Identification" in this chapter.
PLEASE GIVE THE FOLLOWING DATA WHEN MAKING A CALL TO
SCHNEIDER ELECTRIC:

− CORTEC code of the MiCOM relay

− Serial number of the MiCOM relay

− Schneider Electric s order reference

− Schneider Electric s operator reference

Schneider Electric Worldwide Contact Centre:

− Phone: +44 1785 25 00 70

− Website: www.schneider-electric.com
P12y/EN GS/E95 Getting Started

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BLANK PAGE
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127

APPLICATION GUIDE
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 1/96

CONTENT

1. INTRODUCTION 5
1.1 Protection of Underground and Overhead Lines 5

2. CURRENT PROTECTIONS & AUTOMATION FUNCTIONS 6

2.1 [67/50/51] Directional/non Directional Three Phase Overcurrent Protection (P127) 6
2.2 [67] Directional Overcurrent protection 6
2.2.1 Description 6
2.2.2 Synchronous Polarisation 9
2.2.3 I>…I>>…I>>> Interlock 10
2.2.4 Setting Guidelines 11
2.2.5 Directional three phase overcurrent applications 12
2.3 [50/51] Three phase Overcurrent protection (P126 – P127) 14
2.3.1 Instantaneous Function [50/51] 14
2.3.2 I>…I>>…I>>> Interlock 14
2.3.3 Three phase overcurrent protection applications 15
2.4 Directional Earth Fault Protection (P125, P126 & P127) 16
2.4.1 General Setting Guidelines 18
2.4.2 An application of 67N in an Insulated Systems 18
2.4.3 Wattmetric (Pe) Characteristic 20
2.4.4 Application Considerations 21
2.4.5 Iecos protection 21
2.4.6 Where use Iecos and where use Pe. 21
2.5 Derived earth overcurrent threshold (Ie>>>>, P127 only) 22
2.5.1 Ie>…Ie>>…Ie>>> Interlock 23
2.6 Application of a MiCOM P125 relay as a Single Element Power Relay 23
2.6.1 Overview 23
2.6.2 Relay Connection 24
2.6.3 Relay Characteristic Angle Setting 25
2.6.4 Replacing an MWTU11/TWL1111 Reverse Power / Forward Power Relay. 26
2.6.5 Application of the Power Function 26
2.7 Thermal Overload Protection (P126 & P127) 26
2.7.1 Time Constant Characteristic 27
2.7.2 Mathematical Formula Applicable to MiCOM Relays: 27
2.7.3 Setting Guidelines 28
2.8 Undercurrent Protection (P126 & P127) 28
2.9 Negative Sequence Overcurrent Protection (P126 & P127) 28
2.9.1 I2 Thresholds Setting Guidelines 29
2.10 Restricted earth fault 30
2.10.1 Introduction 30
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2.10.2 High impedance principle 30

2.10.3 Setting guide 31
2.10.4 Use of METROSIL non linear resistors 32

3. VOLTAGE PROTECTIONS 35
3.1 Setting for the Voltage Connections 35
3.2 Consideration on the measurement menu 36
3.3 (59N) Zero Sequence Overvoltage Protection (P125, P126 & P127) 36
3.3.1 Setting Guidelines 36
3.4 (27) Undervoltage Protection (P127) 36
3.4.1 Setting Guidelines 37
3.5 (59) Overvoltage Protection (P127) 37
3.5.1 Setting Guidelines 38

4. OTHER PROTECTION FUNCTION INTEGRATED IN P127 39

4.1 Under/Over frequency (81 U/O) 39
4.1.1 Description 39
4.2 Rate of frequency change protection (dF/dt) (81R) 39
4.2.1 Description 39
4.2.2 dF/dt functionning 40
4.3 3 phases directional Over / Under power (32) 42
4.3.1 Description 42
4.3.2 Power Measurement displayed 42
4.3.3 Overview 44

5. DESCRIPTION AND SETTING GUIDE OF THE

AUTORECLOSE FUNCTION (P126 & P127) 45
5.1 Introduction 45
5.2 Description of the function 46
5.2.1 Autorecloser activation 46
5.2.2 Logic Inputs 46
5.2.3 Autoreclose Logic Outputs 47
5.2.4 Autoreclose logic description 48
5.2.5 Autoreclose Inhibit Following Manual Close 48
5.2.6 Recloser lockout 48
5.2.7 Setting group change lockout 48
5.2.8 Rolling demand 48
5.3 Setting Guidelines 49
5.3.1 Number Of Shots 49
5.3.2 Dead Timer Setting 49
5.3.3 Minimum drop-off time setting 49
5.3.4 Reclaim Timer Setting 52
5.3.5 Autoreclose setting guideline 53
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5.3.6 Number Of Shots 56

5.3.7 Dead Timer Setting 56
5.3.8 Fuse application 58

6. AUTOMATIC CONTROL FUNCTIONS 61

6.1 Trip Commands 61
6.2 Latch relays 61
6.3 Broken Conductor Detection (P126 & P127) 61
6.3.1 Setting Guidelines 61
6.3.2 Example Setting 62
6.4 Inrush Blocking (P127 only) 62
6.4.1 Overview 62
6.4.2 Operation 62
6.4.3 Principle 64
6.5 Cold Load Pick-up (P126 & P127) 65
6.6 VTS 66
6.6.1 VTS occurrence 66
6.6.2 VTS alarm 66
6.6.3 VTS Blocks 51V 66
6.6.4 Directional protection modification 67
6.6.5 Voltage/Power protection 67
6.7 Current Transformer Supervision (CTS) 67
6.7.1 The CT Supervision Feature 67
6.8 51V (voltage controlled overcurrent) features (P127 only) 68
6.9 Auxiliary Timers (P125, P126 & P127) 70
6.10 Selective Scheme Logic (P126 & P127) 70
6.11 Blocking logic function (Blocked directional/non directional overcurrent protection) 71
6.12 Circuit Breaker State Monitoring 72
6.13 Circuit Breaker Condition Monitoring (P126 & P127) 72
6.14 Circuit Breaker Condition Monitoring Features (P126 & P127) 72
6.14.1 Setting Guidelines 73
6.15 Circuit Breaker Failure (P126 & P127) 73
6.15.1 Circuit Breaker Failure Protection Mechanism 74
6.15.2 Breaker Fail Settings 74
6.16 Trip Circuit Supervision (P126 & P127) 75
6.16.1 MiCOM P126 & P127 Trip Circuit Supervision Mechanism 75
6.16.2 External Resistor R1 Calculation 78
6.17 Switch onto Fault Protection & Trip on Reclose (SOTF/TOR) (P126 & P127) 80
6.17.1 General 80
6.17.2 SOTF/TOR description 80
6.18 Local/Remote conditioning (P125, P126 & P127) 81
6.18.1 General 81
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6.18.2 Settings 81
6.19 Logic equations (P126 & P127) 82

7. RECORDS (P125, P126 & P127) 83

7.1 Event Records 83
7.2 Fault Records 83
7.3 Instantaneous Recorder 83
7.4 Disturbance Records 83

8. ROLLING AND PEAK VALUE DEMANDS (P126 & P127) 84

8.1 Rolling demand 84
8.2 Peak value demand 85

9. SETTING GROUP SELECTION (P125, P126 & P127) 86

9.1.1 Setting group change by digital input 86
9.1.2 Priority 86

10. MEASUREMENTS 87
10.1 Power and Energy Measurements (P127) 87
10.2 Additional measurement CT (P127 optional configuration only) 88
10.2.1 Frequency 88
10.2.2 Currents 89
10.2.3 Voltages 90
10.2.4 Powers 90
10.2.5 Energies 91
10.2.6 Plus and minus signes for power and energy calculation. 91

11. LOGIC INPUTS AND LOGIC OUTPUTS 93

11.1 Logic Inputs 93
11.2 Logic Outputs 93

12. MAINTENANCE MODE 94

13. CT REQUIREMENTS 95
13.1 Definite time / IDMT overcurrent & earth fault protection 95
13.2 Instantaneous overcurrent & earth fault protection 95
13.3 Definite time / IDMT sensitive earth fault (SEF) protection 95
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1. INTRODUCTION
1.1 Protection of Underground and Overhead Lines
The secure and reliable transmission and distribution of power within a network is heavily
dependent upon the integrity of underground cables and overhead lines, which link the
various sections of the network together. Therefore the associated protection system must
also provide both secure and reliable operation.
The most common fault conditions, on underground cables and overhead lines, are short
circuit faults. These faults may occur between the phase conductors but will most often
involve one or more phase conductor becoming short-circuited to earth.
Faults caused by short circuits require the fastest faulted conductor clearance times but at
the same time allowing for suitable co-ordination with other downstream protection devices.
Fault sensitivity is an issue common to all voltage levels. For transmission systems, tower-
footing resistance can be high. Also, high resistance faults might be prevalent where lines
pass over sandy or rocky terrain. Fast, discriminative faulted conductor clearance is required
for these fault conditions.
The effect of fault resistance is more pronounced on lower voltage systems, resulting in
potentially lower fault currents, which in turn increases the difficulty in the detection of high
resistance faults. In addition, many distribution systems use earthing arrangements designed
to limit the passage of earth fault current.
Earthed methods as such as using resistance, Petersen coil or insulated systems make the
detection of earth faults arduous. Special protection equipment is often used to overcome
these problems.
Nowadays, the supply continuity in the energy distribution is of paramount importance.
On overhead lines most of faults are transient or semi-permanent in nature.
In order to increase system availability multi-shot autoreclose cycles are commonly used in
conjunction with instantaneous tripping elements. For permanent faults it is essential that
only the faulted section of the network is isolated. High-speed, discriminative fault clearance
is therefore a fundamental requirement of any protection scheme on a distribution network.
Power transformers are installed at all system voltage levels and have their own specific
requirements with regard to protection. In order to limit the damage incurred by a transformer
under fault conditions, fast clearance of the windings with phase to phase and phase to earth
faults is a primary requirement.
Damage to electrical plant equipment such as transformers, cables and lines may also be
incurred by excessive loading conditions, which leads directly to overheating of the
equipment and subsequent degradation of their insulation. To protect against such fault
conditions, protective devices require thermal characteristics too.
Uncleared faults, arising either from the failure of the associated protection system or of the
switchgear itself, must also be considered. The protection devices concerned should be
fitted with logic to deal with breaker failure and relays located upstream must be able to
provide adequate back-up protection for such fault conditions.
Other situations may arise on overhead lines, such as broken phase conductors.
Traditionally, a series fault has been difficult to detect.
With today's digital technology, it is now possible to design elements, which are responsive
to such unbalanced system, conditions and to subsequently issue alarm and trip signals.
On large networks, time co-ordination of the overcurrent and earth fault protection relays can
often lead to problematic grading situations or, as is often the case, excessive fault
clearance times. Such problems can be overcome by relays operating in blocked overcurrent
schemes.
P12y/EN AP/E95 Application Guide

Page 6/96 MiCOM P125/P126 & P127

2. CURRENT PROTECTIONS & AUTOMATION FUNCTIONS

2.1 [67/50/51] Directional/non Directional Three Phase Overcurrent Protection (P127)
The directional/non directional overcurrent protection has three thresholds.
Each threshold can operate in directional or non-directional mode; if the setting is [Yes] it
operates like a typical three-phase overcurrent protection.
With the setting [DIR] the relay operates like a three-phase directional overcurrent protection
(only for the P127 relay), when the setting is [NO] it can not operate.
The third threshold can be set to operate on the peak of the measured phase current.
It compares the biggest peak value of the measured current against the setting.
The peak detection is applied where a CT saturation condition occurs and the measure is not
more trustworthy.
2.2 [67] Directional Overcurrent protection
2.2.1 Description
If a fault current can flow in both directions through a relay location, it is necessary to add
directionality to the overcurrent relays in order to obtain correct co-ordination. Typical
systems that require such protection are parallel feeders (both plain and transformer) and
ring main systems, each of which are relatively common in distribution networks.
In order to give directionality to an overcurrent relay, it is necessary to provide it with a
suitable reference, or polarising signal. The reference generally used is the system voltage,
as its angle remains relatively constant under fault conditions. The phase fault elements of
the directional relay are internally polarised by the quadrature phase-phase voltages, as
listed in the table below:

Protected Phase Operating Current Polarising Voltage

A Phase IA VBC
B Phase IB VCA
C Phase IC VAB

UAB

IA

UBC

IC IB

UCA
P0354ENa

Under system fault conditions, the fault current vector will generally lag its nominal phase
voltage by an angle dependent on the system X/R ratio.
It is important that the relay operates with maximum sensitivity for currents lying in this
region.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 7/96

RCA This is achieved by means of the relay

characteristic angle (RCA) setting (also
referred to as torque angle). RCA
Iph Uph-ph defines the angle by which the current
applied to the relay must be displaced
Forward from the voltage applied to the relay to
tripping zone obtain maximum relay sensitivity.
A programmable tripping zone with
reference to relay characteristic angle
Backward
tripping zone
(RCA) or torque angle is available.
Tripping zone is settable from:
±10˚ to ±170˚ in step of 1˚ with reference
to RCA (Torque angle)
RCA (Torque angle) is settable from
0˚ to 359˚ in step of 1˚
P0079ENa

U [V] The calculation of the angle between

Non measurable angle zone phase voltage and phase current
depends on the values for voltage and
1.5 current.
The close figure shows the calculation
1
zone.

0.5

0.1 0.2 0.3 0.4

I [In]
P0080ENa

Each directional threshold consists of:

− Current threshold,

− RCA angle /Torque angle and Trip boundary zone.

The system voltage provides the polarisation signal, the minimum voltage operating value is
0.6V secondary for the voltage input range 57-130V and 3V for the voltage input range 220-
480V.
The first and second thresholds can be set as definite delay time or inverse delay time using
the IEC, IEEE/ANSI, CO, RI and RECT curves where their parameters are shown in the
Technical Data of this Technical Guide.
The third threshold can be set as definite delay time only, but can be set to work on the peak
of the current measured in non-directional way.
The protection elements trip when the following conditions occur:

− The phase current exceeds the set overcurrent threshold,

− The current vector lies within the trip boundary zone.

P12y/EN AP/E95 Application Guide

Page 8/96 MiCOM P125/P126 & P127

The following diagrams show the functionality for each threshold:

LOGIC OF THE FIRST THRESHOLD I> FOR THE 67 PROTECTION

Rev. Inst. I>

≥ Fwd. Inst. I>

Fwd. IA> on relay 2...8

IA & (IA^VBC) > DT/IDMT
Fwd. IB> on relay 2...8
IB & (IB^VCA) > DT/IDMT
Fwd. IC> on relay 2...8
IC & (IC^VAB) > DT/IDMT

Lock the timer Fwd. Trip I>

Blocking Logic
≥
Fwd: forward
Rev: reverse
P0355ENb

LOGIC OF THE SECOND THRESHOLD I>> FOR THE 67 PROTECTION

Rev. Inst. I>>

≥ Fwd. Inst. I>>

IA & (IA^VBC) >>

Fwd. Trip I>>
IB & (IB^VCA) >>
≥ DT/IDMT

IC & (IC^VAB) >>

Lock the timer

Blocking Logic

Fwd: forward
Rev: reverse
P0356ENb
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 9/96

LOGIC OF THE THIRD THRESHOLD I>>> FOR THE 67 PROTECTION

Rev. Inst. I>>>

≥ Fwd. Inst. I>>>

IA & (IA^VBC) >>>

Fwd. Trip I>>>
IB & (IB^VCA) >>>
≥ DT
IC & (IC^VAB) >>>

Lock the timer

Blocking Logic

Fwd: forward
Rev: reverse
P0357ENa

The following figures show the windows where the first phase trip forward and instantaneous
reverse trip can be assigned to an output relay. The same one is for the 2nd and 3rd stages.

tI> 8765432 Assigning the first phase delayed forward directional

0000100 overcurrent threshold (tI>) to output 4 (RL4).
Setting choice: 1 is assigning an output relay; 0 no
assignment.
I_R> 8765432 Assigning the first phase instantaneous reverse directional
0100010 overcurrent (I_R>) to output 3 & 7 (RL3 & RL7).
Setting choice: 1 is assigning an output relay; 0 no
assignment.
2.2.2 Synchronous Polarisation
The directional overcurrent elements are polarised by the line voltage (phase to phase) in
quadrature to the considered phase current.
The absolute phase angle of line voltages is measured every cycle and the last value is
stored in the relay memory.
When with close-up three phase faults the polarisation voltage is collapsed, the synchronous
polarisation is switched on.
The polarisation discrimination voltage value is 0.6V (fixed value) for relays with a system
voltage of 57 to 130V and 3V (fixed value) for relays with a system voltage of 220 to 480V.
Over this value the directional relay uses standard polarisation (the measured voltage),
under this value the synchronous polarisation (stored vector) is used. The synchronous
polarisation is maintained up to the restoration of an input voltage value.
If the input voltage loss continues longer than 5s the directional overcurrent protection is
blocked.
P12y/EN AP/E95 Application Guide

Page 10/96 MiCOM P125/P126 & P127

2.2.3 I>…I>>…I>>> Interlock

The choice of this functionality is available when the IDMT delay trip time is chosen on the
first threshold.
The following figures show the window where the functionality can be or not to be assigned

I> >> >>> Interlock of first threshold by the second and third
Interlock Yes thresholds, but only if first threshold trip is set to IDMT.
Setting choice: No, Yes

The 2nd and 3rd threshold pickup can suspend 1st threshold output control to save selectivity.
Below it is shown the trend of the delay trip time of the first threshold in the both cases Yes
or No.

t t

t_I> t_I>>

t_I>>>

I> I>> I I> I>> I>>> I

I> >> >>>Interlock NO I> >> >>>Interlock YES

I> t I> t

I>> t I>> t

I>>> t I>>> t

P0358ENa
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 11/96

2.2.4 Setting Guidelines

The applied current settings for directional overcurrent relays depend on the specific
application. In a parallel feeder arrangement, load current is always flowing in the non-
operating direction. Consequently the relay current setting may be less than the full load
rating of the circuit, typically 50% of In.
Note that the minimum setting that may be applied has to take into account the thermal
rating of the relay. Some electro-mechanical directional overcurrent relays have continuous
withstand ratings of only twice the applied current setting. Therefore 50% of rating was the
minimum setting that had to be applied.
With the latest generation relays the continuous current rating is 4 x rated current. If required
it is now possible to apply much more sensitive settings.
In a ring main arrangement, it is possible for load current to flow in either direction through
the point where the relay is located. Consequently the current setting must be above the
maximum load current, as in a standard non-directional application.
The required relay characteristic angle (RCA) settings for directional relays will depend on
the exact application in which they are used.
For instance for plain feeders where the zero sequence source is behind the relay, a RCA of
30° should be set.
The following picture shows the above examples:

90˚ connection, RCA 30˚ (lead)

Plain feeder, zero sequence source behind the relay

UA UA TRIP ZONE +/-90˚

IA
IA fault
IA
RCA angle: 30˚
VBC VBC
UB
UC UB UC
Normal: Fault:
UA^IA=30˚ UA^IA=60˚- 80˚
P0359ENb

On the P127 relay, it is possible to set the relay characteristic angle (RCA) or torque angle,
as it is also called, in the range of 0° to +359° in steps of 1°. The trip boundary zone
associated to the RCA is settable in the range from ±10° to ±170° in steps of 1°.
Further information about the setting range for the directional overcurrent protection are
available in the Technical Data document.
P12y/EN AP/E95 Application Guide

Page 12/96 MiCOM P125/P126 & P127

2.2.5 Directional three phase overcurrent applications

2.2.5.1 Parallel Feeders

R1 R2
P126 P126
OC/EF OC/EF

R3 R4
P127 P127
F
DOC/DEF DOC/DEF
OC/EF OC/EF

11K

R5
P126
OC/EF

P0081ENa

TYPICAL DISTRIBUTION SYSTEM USING PARALLEL TRANSFORMERS

The above figure shows a typical distribution system using parallel power transformers.
In such an application, a fault at ‘F’ could result in the tripping of both relays R3 and R4, and
the subsequent loss of supply to the 11kV busbar.
Consequently with this system configuration, it is necessary to apply directional relays at
these locations set to 'look into' their respective upstream transformers.
These relays should co-ordinate with the relays R1 and R2, so that discriminative relay
operation during such fault conditions is ensured.
In such an application, relays R3 and R4 may commonly require non-directional overcurrent
protection elements to provide protection to the 11kV busbar, in addition to providing a back-
up function to the overcurrent relays on the outgoing feeders (R5).
Note that the above requirements outlined for parallel transformer arrangements are equally
applicable for plain feeders, which are operating in parallel.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 13/96

2.2.5.2 Ring Main Arrangement

A particularly common arrangement within distribution networks is the ring main circuit. The
primary reason for its use is to maintain supplies to consumers in the event of fault
conditions occurring on the interconnecting feeders.
A typical ring main with associated overcurrent protection is shown in the following figure.

A
2,1s
51

0,1s
67 51 2,1s
Load
F B
0,1s
67
Load
1,7s Load 67
1,7s
67

0,5s
67
Load Load
67 0,5s
67 1,3s
E Load C

1,3s 0,9s 67 67

67 0,9s
D
P0082ENa

TYPICAL RING MAIN WITH ASSOCIATED OVERCURRENT PROTECTION

As with the previously described parallel feeder arrangement, it can be seen here that
current may flow in either direction through the various relay locations.
Therefore, directional overcurrent relays are again required in order to provide a
discriminative protection system.
The normal grading procedure for overcurrent relays protecting a ring main circuit is to open
the ring at the supply point and to grade the relays first clockwise and then counter-
clockwise. The arrows shown at the various relay locations in above figure depict the
direction for forward operation of the respective relays, i.e. in the same way as for parallel
feeders, the directional relays are set to 'look into' the feeder that they are protecting. The
above figure shows typical relay time settings (if definite delay time co-ordination was set),
from which it can be seen that faults on the interconnections between stations are cleared
without any discrimination by the relays at each end of the feeder.
Again, any of the three overcurrent stages may be configured to be directional and co-
ordinated as per the previously outlined grading procedure, noting that IDMT characteristics
are selectable on the first and second stage.
Note that the above requirements outlined for the parallel transformer arrangements are
equally applicable for plain feeders, which are operating in parallel.
P12y/EN AP/E95 Application Guide

Page 14/96 MiCOM P125/P126 & P127

2.3 [50/51] Three phase Overcurrent protection (P126 – P127)

The three phase overcurrent protection has three independent thresholds.
The first and second threshold can be set as definite delay time or inverse delay time using
the IEC, IEEE/ANSI, CO, RI and RECT curves where their parameters are shown in the
Technical Data of this Application Guide.
The third threshold can be set to operate on the peak of the measured phase current.
It compares the biggest peak value of the measured current against the setting.
The peak detection is applied where a CT saturation condition occurs and the measure is not
more trustworthy.
The logical current over-threshold functionality is defined below.
2.3.1 Instantaneous Function [50/51]
As soon as a phase threshold is running, the instantaneous output associated with this
threshold is activated. This output indicates that the protection element has detected a phase
fault and that the time delay associated with the threshold has started.
2.3.2 I>…I>>…I>>> Interlock
The choice of this functionality is available when the IDMT delay trip time is selected.

The 2nd and 3rd threshold pickup can suspend 1st threshold output control to save selectivity
Below it is shown the trend of the delay trip time of the first threshold in the both cases Yes
or No.

t t

t_I> t_I>>

t_I>>>

I> I>> I I> I>> I>>> I

I> >> >>>Interlock NO I> >> >>>Interlock YES

I> t I> t

I>> t I>> t

I>>> t I>>> t

P0358ENa
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 15/96

2.3.3 Three phase overcurrent protection applications

Being P127 a three phase directional/non directional relay an overcurrent protection involves
the P127 used as non directional relay and the P126.

Some applications can be considered, but for indicative applications it is better to involve the
blocking logic and selective functions, so an overcurrent application will be shown in the part
of this TG regarding the blocking logic and selective function.
The following diagrams show the functionality for each thresholds:

LOGIC OF THE FIRST THRESHOLD I> FOR THE 50/51 PROTECTION

≥
Inst. I>

Fwd. IA> on relay 2...8

IA > DT/IDMT
Fwd. IB> on relay 2...8
IB > DT/IDMT
Fwd. IC> on relay 2...8
IC > DT/IDMT

Fwd. Trip I>

≥
Blocking Logic Lock the timer

P0360ENb

LOGIC OF THE SECOND THRESHOLD I>> FOR THE 50/51 PROTECTION

≥
Inst. I>>

IA >>
Trip I>>
IB >>
≥ DT/IDMT

IC >>

Lock the timer

Blocking Logic
P0361ENb
P12y/EN AP/E95 Application Guide

Page 16/96 MiCOM P125/P126 & P127

LOGIC OF THE THIRD THRESHOLD I>>> FOR THE 50/51 PROTECTION

≥ Inst. I>>>

IA >>>

≥
IB >>> Trip I>>>
DT
IC >>>

Lock the timer

Blocking Logic
P0362ENa

2.4 Directional Earth Fault Protection (P125, P126 & P127)

The MiCOM P125, P126, P127 relays have a directional/non directional earth fault
protection.
It provides three directional/non directional earth overcurrent thresholds and two wattmetric
and active earth fault current thresholds.
The first and second threshold can be set as definite or inverse delay time using the IEC,
IEEE/ANSI, CO2-8, RI and RECT curves as shown in the Technical Data of the relays; for
the wattmetric protection ( Pe / IeCos ) only the first threshold can be set as definite or
inverse delay time, always using IEC, IEEE/ANSI, CO, RI and RECT curves.
The directional earth fault overcurrent protection element compares the earth fault current,
residual voltage with the set thresholds Ie>, Ue>, Ie>>, Ue>>, Ie>>>, Ue>>>, the derived
earth current Ie>>>> and the relevant angle between the Ie and Ue for each threshold. Once
all the following listed requirements are met the tripping command is set:

− thresholds for Ie and Ue are exceeded (earth fault OC protection element),

− Ie current vector is in the tripping area (Ie^Ue),

− Ie [mA] + Ue [V] > 18 (Ien=1A) or Ie [mA] + 5 x Ue [V] > 90 (Ien=5A),

− the tripping timer expires.

The protection's tripping area is defined by a tripping zone settable form ± 10° to ± 170° in
steps of 1° for each tripping threshold and a settable angle from 0° to 359° in steps of 1°
named torque/RCA angle (Ie^Ue), which can be separately set for each tripping threshold.
The same threshold can be set as non-directional with definite or inverse delay time.
The third current threshold can be set as directional or non-directional but with only definite
delay time setting. The same applies to the Pe or IeCos second threshold.
The third threshold can work on the measured peak by an opportune choice in the dedicated
submenu. (See the FT part of the TG)
The peak detection is applied where a CT saturation condition occurs and the measure is not
more trustworthy.
The reset delay time for each threshold provides protection against intermittent faults.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 17/96

RCA The close figure shows the forward and

Ue reverse tripping zone for the directional
earth fault protection.
Ie
Forward
tripping zone

Backward
tripping zone

Tripping zone is settable from:

±10˚ to ±170˚ in step of 1˚ with reference
to RCA (Torque angle)
RCA (Torque angle) is settable from
0˚ to 359˚ in step of 1˚
P0083ENa

The protection element also provides a non-sensitive area to avoid instability due to small
asymmetries and unbalances that can generally be present in the network system. This
condition is represented by the characteristic reproduced below, where the hatched area is
the tripping zone.
The tripping zone is limited by the equation Ie +(k x Ue) < (k x 18). (18 is a value derived
experimentally where stability is guaranteed).
The K factor is 1, if Ien=1A, 5 if Ien=5A.

Ie [mA]
30
Ue> Ie [mA]
Ue>> 100
25 Ue>
Ue>>> Ue>>
Ue>> >
Tripping Zone 90
20
Tripping Zone
80
Ie + Ue= 18
15 Ie + 5 x Ue= 90
60
10
Ie> 40
Ie>> Ie>
5 Ie>>
Ie>>> 20 Ie>> >

0 5 10 15 20 25 30 0
Ue [V] 5 10 15 20 25 30
Ue [V]
P0068ENa P0067ENa

Ien=1A Ien=5A
The directional earth fault element needs a suitable voltage supply to provide the necessary
polarisation. (See the Technical data for further information)
The polarising signal must be representative of the earth fault condition. As residual voltage
is generated during earth fault conditions, and this quantity is used to polarise directional
earth fault elements. The P127 relay can derive this voltage internally from the 3 phase
voltage inputs when the VT connection option 3Vpn is set. It can also be measured directly
by a VT transformer when the VT connection option 2Vpp+Vr (two phase to phase) or
2Vpn+Vr (two phase to neutral) is set.
The P125 and P126 measures this voltage directly from a broken delta or single VT.
P12y/EN AP/E95 Application Guide

Page 18/96 MiCOM P125/P126 & P127

2.4.1 General Setting Guidelines

When setting the relay characteristic/torque angle for the three phase directional overcurrent
element, a positive angle setting was specified. This was due to the fact that we consider as
polarising voltage, the phase voltage value in quadrature of the current under fault
conditions. With directional earth fault protection, the residual current under fault conditions
lies at an angle lagging the polarising residual earth fault voltage.
The following listed angle settings are recommended to fix the right direction of the earth
fault for the various earthed systems.

Resistance earthed systems 180°

Insulated systems 270°
Petersen Coil system 200°
Transmission Systems (solidly earthed) 90°-120°

The setting ranges for directional/non-directional earth fault and wattmetric protection
(Pe/IeCos) can be found in the FT and TD chapters of the technical guide.
2.4.2 An application of 67N in an Insulated Systems
The advantage with an insulated power system is that during a single phase to earth fault
condition, no high earth fault current will flow. Consequently, it is possible to maintain power
flow on the system even with an earth fault condition present. However, this advantage is
offset by the fact that the resultant steady state and transient over-voltages on the healthy
phases can be very high. In general insulated systems will only be used in low or medium
voltage networks where it does not prove too costly to provide the necessary insulation
against such over-voltages.
Higher system voltages would normally be solidly earthed or earthed via a low impedance.
Operational advantages may be obtained by the use of insulated systems.
However, it is still essential that detection of the earth fault condition is achieved. This is not
possible if standard current operated earth fault protection equipment is used. One possibility
for earth fault detection is by applying a residual over-voltage protection device. This
functionality is provided by the MiCOM P125, P126 and P127 relays.
However, fully discriminative earth fault protection on this type of system can only be
achieved by earth fault protection element. This protection element is included in directional
relays MiCOM P125, P126 & P127.
It is essential that a core balance CT is used for high sensitive earth fault detection. This
eliminates the possibility of spill current that may arise from slight mismatches between
residually connected line CTs. It also enables a much lower CT ratio to be applied, thereby
allowing the required protection sensitivity to be more easily achieved.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 19/96

A B C
Ia1
Ib1

IR1 -jXc1

IH1
Ia2
Ib2

IR2 -jXc2

IH2
Ia3
Ib3
IH1+IH2+IH3

IR3 -jXc3

IH3 IH1+ IH2

IR3=-(Ia1+Ib1+Ia2+Ib2)+Ia3+Ib3-(Ia3+Ib3)
IR3=-(IH1+IH2)+IH3-IH3 P0363ENa

From above figure and the vector diagram below it can be seen that the relays on the
healthy feeders see the unbalance in the charging currents on their own feeder. The relay on
the faulted feeder, however, sees the charging current from the rest of the system [IH1 and
IH2 in this case], with it’s own feeders charging current [IH3] being cancelled out.

UA

UC UB

UAf Vr=3Ve

IH1+IH2 Ib1+Ib2
Ia1+Ia2
270˚

TRIP ZONE
O' UBf
IR3=-(IH1+IH2)+IH3-IH3

A setting of Torque(RCA) angle of 270˚

shifts the center of the characteristic to
here
P0364ENa

Referring to the vector diagram, it can be seen that the C phase to earth fault causes the
phase voltages on the healthy phases to rise by a factor of 3.
P12y/EN AP/E95 Application Guide

Page 20/96 MiCOM P125/P126 & P127

The A phase charging current (Ia), is then shown to be leading the resultant A phase voltage
by 90°. Likewise, the IB phase charging current leads the resultant voltage Vb by 90°.
The unbalance current detected by a core balance current transformer on the healthy
feeders can be seen as the vector addition of Ia1 and Ib1 (Ia2 and Ib2), giving a residual
current which lies at exactly 90° anticipating the polarising voltage (Vr=3Ve).
The vector diagram indicates that the residual currents on the healthy and faulted feeders,
IH1& IH2 and IR3 respectively, are in opposite direction to each other (180°). A directional
element could therefore be used to provide discriminative earth fault protection.
If the polarising voltage of this element, equal to 3Ve, is shifted through +270°, the residual
current seen by the relay on the faulted feeder will lie within the operate region (Trip Zone) of
the directional characteristic. As previously stated, the required RCA setting for the sensitive
earth fault protection when applied to insulated systems, is 270°.
2.4.3 Wattmetric (Pe) Characteristic
The P125, P126 and P127 relays include the zero sequence power measurement function.
They also offer the possibility to choose between a Wattmetric (Pe) protection and IeCos
(active component of the earth fault current) protection functionality mode.
The following figure shows the characteristic tripping zone for the wattmetric protection.

Pe/IeCos

Tripping zone

Pe> Pe>>
5˚ 5˚ IeCos> IeCos>>
Q/IeSin
P0365ENa

In the following formula the power thresholds in the relay menu are called Pe> & Pe>>.
The Pe> and Pe>> settings are calculated as:
Vres x Ires x Cos (f – fc) = 9 x Ve x Ie x Cos (f – fc)
Where:
f = angle between the polarising voltage (Vres) and the residual current
fc = relay characteristic angle (RCA/torque angle)
Vres = residual voltage
Ires = residual current
Ve = zero sequence voltage
Ie = zero sequence current
2.4.3.1 Setting Guidelines for Pe Thresholds
The Pe thresholds are displayed in the format: ##.## x Ien W
In this formula the ##.## setting value is multiplied by the setting value of the Ien.
The threshold value is expressed in Watt secondary.
Example: The Pe> threshold is to be set from the relay front panel and the setting value is
20W.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 21/96

Ien = 1A, the internal relay setting value will be equal to 20 x 1 = 20W.
To set the thresholds for the Pe (Wattmetric/IeCos) protection the relay will display the menu
“Wattmetric Protection \ Pe>” (refer to P12y/EN FT section).

The same procedure is to be applied for setting the second Pe>> threshold.
For the settings of the trip delay time see the FT chapter of the TG.
2.4.4 Application Considerations
The protection Pe> and Pe>> require relay current and voltage connections to be actived.
The measurement of the Pe depends on the voltage wiring of the relay.
In case of 3Vpn wiring the Ve will be equal to Ve= 1/3(Va+VB+VC) in the other insertions
way the applied voltage to the relay is directly used to calculate the Pe.
Referring to the relevant application diagram for the P125, P126 and P127 relays, it should
be installed such that its direction for forward operation is 'looking into' the protected feeder
i.e. away from the busbar, with the appropriate RCA .

Resistance earthed systems 180°

Insulated systems 270°
Petersen Coil system 200°
Transmission Systems (solidly earthed) 90°-120°

As illustrated in the relay application diagram, it is usual for the earth fault element to be
driven from a core balance current transformer. This eliminates the possibility of spill current
that may arise from slight mismatches between residually connected line CTs. It also
enables a much lower CT ratio to be applied, thereby allowing the required protection
sensitivity to be more easily achieved.
2.4.5 Iecos protection
The Iecos protection follows the same concepts of the Pe protection.
The difference is that the thresholds take in account the active component of the earth fault
current.
The setting of the RCA follows the above listed table.

2.4.6 Where use Iecos and where use Pe.

The wattmetric protection Pe/Iecos is almost used in the Petersen Coil systems.
In a Petersen Coil scheme during a fault we have a resistive current and an inductive
current.
The resistive current is constant because the residual voltage is always present; the
inductive current is the summation of the capacitive contribution of the healthy line and the
reactive contribution of the fault line.
In this situation is difficult to discriminate the line and detect the fault current value because
the capacitive and reactive are of opposite sign.
Since the residual voltage is present to the parallel between the coil and resistance a
wattmetric protection is used to be sure to open the fault line.
The unique resistive present component depends on the fault line.
The discriminative for the using of Pe or Iecos protection is the fault current value and the
relative fault operating boundary.
In some applications, the residual current on the healthy feeder can lie just inside the
operating boundary following a fault condition. The residual current for the faulted feeder lies
close to the operating boundary.
P12y/EN AP/E95 Application Guide

Page 22/96 MiCOM P125/P126 & P127

In this case, a correct discrimination is achieved by means of an Iecos characteristic, as the

faulted feeder will have a large active component of residual current, whilst the healthy
feeder will have a small value.
For insulated earth applications, it is common to use the Iesin characteristic that can be
obtained by the setting of the characteristic angle to 90° or 270°.
2.5 Derived earth overcurrent threshold (Ie>>>>, P127 only)

The derived earth current (Ie>>>>) is the vectorial summation: IA + IB + IC :

IA + IB + IC = Ie>>>>.
The Ie>>>> can be set as definite delay time or inverse delay time using the IEC,
IEEE/ANSI, CO, RI and RECT curves. Their parameters are shown in the Technical Data
chapter of this Technical Guide.

IA

IB

IC

IA+IB+IC = Ie>>>>

Ie = Tank Earth

P3940ENa

As soon as Ie>>>> threshold is running, the instantaneous output associated with this
threshold is activated. This output indicates that the protection element has detected an
earth fault and that the time delay associated with the threshold has started. This time delay
can be blocked via the logic input "Block Logic" associated with this threshold. If this blocking
input is activated by an output contact of a downstream relay, the logic that will lead to the
trip command is then blocked only if the relay that is the closest to the fault can see and
therefore eliminate the fault. This principle is known as «Blocking logic» or «Blocking». It is
described in more detail in this document.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 23/96

2.5.1 Ie>…Ie>>…Ie>>> Interlock

The choice of this functionality is available when the IDMT delay trip time is selected for the
first earth threshold.
The following figures show the window where this functionality can be or not to be actived.
The 2nd and 3rd threshold pickup can suspend 1st threshold output control to save
selectivity.Below the trend of the delay trip time of the first threshold is shown for both cases
Yes or No.

t t

t_I> t_I>>

t_I>>>

I> I>> I I> I>> I>>> I

I> >> >>>Interlock NO I> >> >>>Interlock YES

I> t I> t

I>> t I>> t

I>>> t I>>> t

P0358ENa

2.6 Application of a MiCOM P125 relay as a Single Element Power Relay

2.6.1 Overview
The MiCOM P125 relay is a single phase relay designed for stand alone directional earth
fault protection. This relay incorporates both an IeCosø and a Zero Sequence Power
element. These elements can be configured to provide a single phase power measurement
or alternatively a sensitive directional overcurrent characteristic similar to that of the
MWTU11/TWL1111 Reverse Power relay.
Using a MiCOM P125 relay as a stand alone power relay provides a wide setting range, the
setting range available is dependent on the CT range ordered. The table below outlines the
settings available for each of the voltage and CT input ranges.

Analogue Input Setting Range (p.u.)

CT Range VT Range Pe Ie Cosø
P125AA 0.1 – 40 57 – 130 10 – 800W 0.1 – 40
P125AB 220 - 480 40 – 3200W
P125BA 0.01 – 8 57 – 130 1 – 60W 0.01 – 8
P125BB 220 - 480 4 – 640W
P125CA 0.002 – 1 57 – 130 0.2 – 20W 0.002 – 1
P125CB 220 - 480 1 – 80W
P12y/EN AP/E95 Application Guide

Page 24/96 MiCOM P125/P126 & P127

Flexible connection arrangements allow for phase to phase or phase to ground connection of
the polarising voltage, a wide range of angle settings allows the relay to operate for Watts or
Vars, Import or export.
The VT inputs for the MiCOM P125 relay are rated 57 to 130 Vac or 220 – 480 Vac
(Selected at time of order) these ranges make the relay suitable for connection to a VT
secondary or direct connection to a 415V systems.
2.6.2 Relay Connection
The relay setting angle which is discussed in further detail below allows the user to
customise the VT connection to suit the primary plant, available VT secondaries and the
protection philosophy of the customer.
The VT connection can be made phase to phase or phase to ground using the connection
table below.
For simplicity the connection has been made so as a reverse power setting will require an
angle of 180 degrees.

Polarising Voltage Terminals

Leading Subscript Laging Subscript
(Eg Va-n) (Eg Va-n)
Va-n
Vb-n
Vc-n
40 39
Va-b
Vb-c
Vc-a

One of the possible line CT connection is shown below, The CT input can be connected to
any available phase CT, (A, B or C).
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 25/96

2.6.3 Relay Characteristic Angle Setting

Below is a table of some of the possible settings to achieve various protection functions for
different CT and VT connections, the settings below are with reference to the connections
outlined above.

Function Voltage Current Angle Setting

Active Power Import Va-n Ia
Vb-n Ib 180
Vc-n Ic
Va-b Ic
Vb-c Ia 270
Vc-a Ib
Reactive Power Import* Va-n Ia
Vb-n Ib 90
Vc-n Ic
Va-b Ic
Vb-c Ia 180
Vc-a Ib
Active Power Export Va-n Ia
Vb-n Ib 0
Vc-n Ic
Va-b Ic
Vb-c Ia 90
Vc-a Ib
Reactive Power Export* Va-n Ia
Vb-n Ib 270
Vc-n Ic
Va-b Ic
Vb-c Ia 0
Vc-a Ib

*Refers to lagging Vars import and export.

Pe/IeCos

Tripping zone

Pe> Pe>>
5˚ 5˚ IeCos> IeCos>>
Q/IeSin
P0365ENa
P12y/EN AP/E95 Application Guide

Page 26/96 MiCOM P125/P126 & P127

2.6.4 Replacing an MWTU11/TWL1111 Reverse Power / Forward Power Relay.

The MWTU11/TWL1111 was not strictly a power measuring relay. The relay operated using
an Icosø characteristic. Provided enough voltage was present to polarise the measuring
element, a 1% setting on a 1A relay would pickup at 10mA independent of the voltage
magnitude applied.
By selecting the 0.01 to 8Ien, model number MiCOM P125B, A setting range of 1 to 100% of
the nominal current in 0.1% steps is available.
2.6.5 Application of the Power Function
The standard configuration of the MiCOM P125 when set to use the wattmetric earth fault
protection can measure the zero sequence power, the connection for this can be found in the
sales publication and service manual. By adopting the connection above the relay can
measure the phase current and phase to phase, or phase to ground voltage, the operate
quantity when using these connections is a single phase power. As power protection is
generally required to operate for balanced three phase conditions basing the protection on a
single phase measured quantity is of no consequence.
When using the Power Function of the relay (Pe) care must be taken when selecting the
relay range. If the MiCOM P125CA relay is considered and is connected phase to ground
with 1A CT secondaries. A 0.2W setting would be equivalent to 0.2/63.5 Watts, 0.3% of the
nominal load.
2.7 Thermal Overload Protection (P126 & P127)
Thermal overload protection can be applied to prevent damages to the electrical plant
equipment when operating at temperatures in excess of the designed maximum withstand. A
prolonged overloading causes excessive heating, which may result in premature
deterioration of the insulation, or in extreme cases, insulation failure.
MiCOM P126 & P127 relays incorporate a current based thermal replica, using load current
to reproduce the heating and cooling of the equipment to be protected. The element thermal
overload protection can be set with both alarm and trip stages.
The heating within any plant equipment, such as cables or transformers, is of resistive type
(I²R x t). Thus, the quantity of heat generated is directly proportional to current squared (I²).
The thermal time characteristic used in the relay is based on current squared, integrated
over time.
The MiCOM P126 & P127 relays automatically use the highest phase current as input
information for the thermal model.
Protection equipment is designed to operate continuously at a temperature corresponding to
its full load rating, where heat generated is balanced with heat dissipated by radiation etc.
Over-temperature conditions therefore occur when currents in excess of rating are allowed to
flow for a certain period of time. It can be shown that temperatures during heating follow
exponential time constants and a similar exponential decrease of temperature occurs during
cooling.
In order to apply this protection element, the thermal time constant (Te) of the plant
equipment to be protected is therefore required.
The following sections will show that different plant equipment possesses different thermal
characteristics, due to the nature of their construction.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 27/96

2.7.1 Time Constant Characteristic

This characteristic is used to protect cables, dry type transformers (e.g. type AN), and
capacitor banks.
The thermal time characteristic is given by:

⎛ −t ⎞
⎜ ⎟
e⎝ τ ⎠ =
(I 2
− (k × I FLC )2 )
(I 2
− I 2p )
Where:
t = Time to trip, following application of the overload current, I
τ = Heating and cooling time constant of the protected plant equipment
I = Largest phase current
IFLC = Full load current rating (relay setting ‘Thermal Trip’)
k = 1.05 constant, allows continuous operation up to < 1.05 IFLC
IP = Steady state pre-loading current before application of the overload
The time to trip varies depending on the load current carried before application of the
overload, i.e. whether the overload was applied from “hot” or “cold”.
Curves of the thermal overload time characteristic are given in Technical Data.
2.7.2 Mathematical Formula Applicable to MiCOM Relays:
The calculation of the Time to Trip is given by:

⎛ Ix 2 − θ ⎞
t Trip = Te In ⎜ ⎟
⎜ Ix 2 − θtrip ⎟
⎝ ⎠
With:
t Trip = Time to trip (in seconds)
Te = Thermal time constant of the equipment to be protected (in seconds)
Ix = Thermal overload equal to Ieq/k Iθ >
Ieq = Equivalent current corresponding to the RMS value of the largest
phase current
Iθ > = Full load current rating given by the national standard or by the supplier
k = Factor associated to the thermal state formula
θ = Initial thermal state. If the initial thermal state = 30% then θ = 0.3
θtrip = Trip thermal state. If the trip thermal state is set at 100%, then θ trip = 1
The settings of these parameters are available in the various menus.
The calculation of the thermal state is given by the following formula:

2⎡ ⎛ −t ⎞ ⎤
⎜ ⎟
⎛ −t ⎞
⎜ ⎟
⎛ I eq ⎞ ⎢1 − e ⎜⎝ Te ⎟⎠ ⎥ + Θ e ⎜⎝ Te ⎟⎠
Θ τ +1 = ⎜⎜ ⎟
⎟ ⎢ ⎥ τ
⎝ k × IΘ > ⎠ ⎢⎣ ⎥⎦

θ being calculated every 100ms.

P12y/EN AP/E95 Application Guide

Page 28/96 MiCOM P125/P126 & P127

2.7.3 Setting Guidelines

The current setting is calculated as:

Thermal Trip (θtrip) = Permissible continuous loading of the plant equipment / CT ratio.
Typical time constant values are given in the following tables.
The relay setting, ‘Time Constant’, is in minutes.
Paper insulated lead sheathed cables or polyethylene insulated cables, placed above ground
or in conduits. The table shows τ in minutes, for different cable rated voltages and conductor
cross-sectional areas:

CSA mm2 6 -11 kV 22 kV 33 kV 66 kV

25 - 50 10 15 40 -
70 - 120 15 25 40 60
150 25 40 40 60
185 25 40 60 60
240 40 40 60 60
300 40 60 60 90
Time constant τ (minutes)

Other plant equipment:

Time constant τ (minutes) Limits

Dry-type transformers 40 Rating < 400 kVA
60 - 90 Rating 400 - 800 kVA
Air-core reactors 40
Capacitor banks 10
Overhead lines 10 Cross section ≥ 100 mm2 Cu
or 150mm² Al
Busbars 60

An alarm can be raised on reaching a thermal state corresponding to a percentage of the trip
threshold. A typical setting might be ‘Thermal Trip’ = 70% of thermal capacity.
2.8 Undercurrent Protection (P126 & P127)
The undercurrent function [37] makes it possible to detect a loss of load (for example the
draining of a pump or breakage of a conveyor belt). It uses definite delay time undercurrent
protection.
The user can set the following parameters:

− undercurrent threshold I<

− time delayed undercurrent threshold tI<

2.9 Negative Sequence Overcurrent Protection (P126 & P127)
When applying traditional phase overcurrent protection, the overcurrent elements must be
set higher than maximum load current, thereby limiting the sensitivity of the element. Most
protection techniques also use an earth fault element operating from residual current, which
improves sensitivity for earth faults. However, certain faults may arise which can remain
undetected by such techniques.
Any unbalanced fault condition will produce negative sequence current of some magnitude.
Thus, a negative phase sequence overcurrent element can operate for both phase-to-phase
and phase to earth faults.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 29/96

This section describes how negative phase sequence overcurrent protection may be applied
in conjunction with standard overcurrent and earth fault protection in order to alleviate some
less common application difficulties.

− Negative phase sequence overcurrent elements give greater sensitivity to resistive

phase-to-phase faults, where phase overcurrent elements may not operate.

− In certain applications, residual current may not be detected by an earth fault relay
due to the system configuration. For example, an earth fault relay applied on the delta
side of a delta-star transformer is unable to detect earth faults on the star side.
However, negative sequence current will be present on both sides of the transformer
for any fault condition, irrespective of the transformer configuration. Therefore, a
negative phase sequence overcurrent element may be employed to provide time-
delayed back-up protection for any un-cleared asymmetrical fault.

− Where fuses protect motors on rotating machines, a blown fuse produces a large
amount of negative sequence current. This is a dangerous condition for the motor due
to the heating effects of negative phase sequence current at double frequency. A
negative phase sequence overcurrent element may be applied to provide efficient
back-up protection for dedicated motor protection relays.

− It may also be required to simply set an alarm at the presence of negative phase
sequence currents on the system. Operators are then prompted to investigate the
cause of the unbalance.
The negative phase sequence overcurrent elements have a current pick up settings I2>,
I2>>, I2>>>, and are time delayed in operation by the adjustable timers tI2>, tI2>>, tI2>>>.
2.9.1 I2 Thresholds Setting Guidelines
This protection element includes three thresholds.
The first threshold can be set as DT or IDMT trip delay time.
The curves are the same as for the [50/51], [50N/51N] protection.
The current pick-up threshold (settable in the menu PROTECTION G1/[46] Neg. Seg. OC)
must be set higher than the normal negative phase sequence current due to the normal load
unbalance that is always present on the system. This can be set at the commissioning stage,
making use of the relay measurement function to display the standing negative phase
sequence current, and apply a setting at least 20% above.
Where the negative phase sequence element is required to operate for specific un-cleared
asymmetric faults, a precise threshold setting has to be based on an individual fault analysis
for that particular system due to the complexities involved. However, to ensure operation of
the protection element, the current pick-up setting must be set approximately 20% below the
lowest calculated negative phase sequence fault current for a specific remote fault condition.
The correct setting of the time delay is vital for this protection element. It should be also seen
that this element is applied primarily to provide back-up protection to other protective devices
or to provide an alarm. Therefore, it would be associated with a long delay time.
It must be ensured that the time delay is set longer than the operating time of any other
protective device (at minimum fault level) on the system, which may respond to unbalanced
faults, such as:

− Phase overcurrent protection elements

− Earth fault protection elements

− Broken conductor protection elements

− Negative phase sequence influenced thermal protection elements

P12y/EN AP/E95 Application Guide

Page 30/96 MiCOM P125/P126 & P127

2.10 Restricted earth fault

2.10.1 Introduction
The restricted earth fault relay is a high impedance differential scheme which balances zero
sequence current flowing in the transformer neutral against zero sequence current flowing in
the transformer phase windings. Any unbalance for in-zone fault will result in an increasing
voltage on the CT secondary and thus will activate the REF protection.
This scheme is very sensitive and can then protect against low levels of fault current in
resistance grounded systems where the earthing impedance and the fault voltage limit the
fault current.
In addition, this scheme can be used in a solidly grounded system. It provides a more
sensitive protection, even though the overall differential scheme provides a protection for
faults over most of the windings.
The high impedance differential technique ensures that the impedance of the circuit is of
sufficiently high impedance such that the differential voltage that may occur under external
fault conditions is lower than the voltage required to drive setting current through the relay.
This ensures stability against external fault conditions and then the relay will operate only for
faults occurring inside the protected zone.
2.10.2 High impedance principle
High impedance schemes are used in a differential configuration where one current
transformer is completely saturated and the other CTs are healthy.

Healthy CT Saturated CT
Protected
circuit
Zm Zm A-G

RCT1 RCT2

IF
R L1 R L3
VS R ST

R L2 R R L4

HIGH IMPEDANCE SCHEME PRINCIPLE

The voltage applied across the relay is:

Vr=If (RCT + 2RL)

If : Maximum secondary external fault current.

RCT : Resistance of the Current transformer secondary winding.
RL : Resistance of a single wire from the relay to the CT.
A stabilizing resistor R ST can be used in series with the relay circuit in order to improve the
stability of the relay under external fault conditions. This resistor will limit the spill current
under Is.
Vs=Is (RST)
Is: Current relay setting
Vs: Stability Voltage setting
Note that the relay consumption has been taken into account.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 31/96

The general stability conditions can be obtained when:

Vs> K.If (RCT + 2RL)

Where K is the stability factor.

This stability factor is influenced by the ratio Vk/Vs which in turns governs the stability of the
REF protection element for through faults .
Vk = The Knee point voltage of the CT.
To obtain a high speed operation for internal faults, the Knee point voltage Vk of the CT must
be significantly higher than the stability voltage Vs . A ratio of 4 or 5 would be appropriate.
For MiCOM P121, P122 and P123, we found the following results:
K= 1 for Vk/Vs less or equal to 16 and
K= 1.2 for Vk/Vs > 16.
NOTE: The maximum internal fault level for stage 3 of 0.002 to 1In board
must not exceed 20In.

C
STAB
E/F Input

P0343ENa

CT CONNECTION DIAGRAM FOR HIGH IMPEDANCE REF APPLICATION

2.10.3 Setting guide
The characteristics of the relay and the value of K influence the stability of the scheme as
explained here above.
The typical setting values shall be chosen to provide a primary operating current less than
30 % of the minimum earth fault level for a resistance earthed system. For a solidly earthed
system, the typical setting shall provide an operating current between 10 and 60 % of the
rated current.
The primary operating current, at the secondary, depends on the following factors:

− Current Transformer ratio

− Relay operating current IS

− Number of CT in parallel with the relay element (n)

− The inrush current of each CT (Ie) at the stability voltage

Iop= CTRatio .(Is + n.Ie)

Current setting should be selected for a high impedance element so that the primary current
reaches its nominal current with a given CT, according to the following equation:
Is < {(Iop / CTRatio) - n.Ie}
P12y/EN AP/E95 Application Guide

Page 32/96 MiCOM P125/P126 & P127

It is also possible to determine the maximum inrush current of the CT to reach a specific
primary operating current with a given relay setting.
The setting of the stabilising resistor must be calculated according to the above formula,
where the setting depends on the required stability voltage setting Vs and the relay setting Is.

Vs k If (RCT+2RL)
=
Is IS

For MiCOM P12x, Is is equivalent to Ie>, so the above equation becomes:

Vs k If (RCT+2RL)
=
Ie> Ie>

with:
K= 1 for Vk/Vs less or equal to 16 and
K= 1.2 for Vk/Vs > 16.
So:
k If (RCT+2RL)
RST =
Ie>

with Vk ќ 4.Is.RST (A typical value to ensure the high speed operation for an internal fault).
CT requirements for High Impedance Restricted Earth Fault Protection
The High Impedance Restricted Earth Fault element shall remain stable for through faults
and operate in less than 40ms for internal faults provided that the following equations are
met in determining CT requirements and the value of the associated stabilising resistor:
Rs = [k* (If) * (RCT + 2RL)] / IS

VK ≥ 4 * Is * Rs
with:
K= 1 for Vk/Vs less or equal to 16 and
K= 1.2 for Vk/Vs > 16.
2.10.4 Use of METROSIL non linear resistors
Metrosils are used to limit the peak voltage developed by the current transformers under
internal fault conditions, to a value below the insulation level of the current transformers,
relay and interconnecting leads, which are normally able to withstand 3KV peak.
The following formula should be used to estimate the peak transient voltage that could be
induced by an internal fault. This peak voltage depends on:

− CT Knee point (VK)

− Voltage that would be induced by an internal fault if CT doesn’t saturate (Vf)

This prospective voltage itself depends on:

− Maximum internal fault secondary current

− CT ratio

− CT secondary winding resistance

− CT lead resistance to the common point

− Relay lead resistance

− Stability resistor value

Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 33/96

Vp = 2√ {2.VK (Vf - Vk)}

Vf = I'f.(Rct + 2RL + RST)

Where:

− Vp: peak voltage developed by the CT under internal fault conditions

− Vf: maximum voltage that would be produced if CT saturation did not occur

− Vk: current transformer Knee point voltage

− I’f: is the maximum internal secondary fault current

− Rct: current transformer secondary winding transformer

− RL: maximum lead burden from CT to relay

− RST: Relay stabilising resistor.

When the value given by the formula is greater than 3KV peak, it is necessary to use
Metrosils. They are connected across the relay circuit and they allow to shunt the secondary
current output of the current transformer from the relay in order to prevent very high
secondary voltages.
Metrosils are externally mounted and have annular discs shape.
Their operating characteristics is according to the formula:

V = C.I0.25
Where:

− V: Instantaneous voltage applied to the non-linear resistor (Metrosil)

− C: Constant of the non-linear resistor (Metrosil)

− I: Instantaneous current through the non-linear resistor (Metrosil)

With the sinusoidal voltage applied across the Metrosil, the RMS current would be
approximately 0.25 times the peak current. This current value can be calculated as follows:
4
⎧Vs(rms). 2 ⎫
Irms = 0.52⎨ ⎬
⎩ C ⎭
Where:

− Vs(rms): RMS value of the sinusoidal voltage applied across the Metrosil.
This is due to the fact that the current waveform through the Metrosil is not sinusoidal but
appreciably distorted.
For satisfactory application of the non-linear resistor (Metrosil), its characteristics should
comply with the following requirements:

− At the relay voltage setting, the non-linear resistor (Metrosil) current should be as
low as possible, but no greater than approximately 30mA rms for 1A current
transformers and approximately 100mA rms for 5A current transformer.

− At the maximum secondary current, the non-linear resistor (Metrosil) should limit
the voltage to 1500V rms or 2120V peak for 0.25 second. At higher relay voltage
settings, it is not always possible to limit the fault voltage to 1500V rms, so higher
fault voltage may have to be tolerated.
The following tables show the typical types of Metrosil that will be required, depending on
relay current rating, REF voltage setting etc.
P12y/EN AP/E95 Application Guide

Page 34/96 MiCOM P125/P126 & P127

Metrosil units for relays with 1A CT

The Metrosil units with 1A CTs have been designed to comply with the following restrictions:

− At the relay voltage setting, the Metrosil current should be less than 30mA rms.

− At the maximum secondary internal fault current, the Metrosil unit should limit the
voltage to 1500V rms if possible.
The Metrosil units normally recommended to be used with 1Amp CTs are shown in the
following table:

Relay Voltage Nominal Characteristics Recommended Metrosil Type

setting C β Single pole Relay Triple pole relay
Up to 125V rms 450 0.25 600A/S1/S256 600A/S3/1/S802
125 to 300V rms 900 0.25 600A/S1/S1088 600A/S3/1/S1195

NOTE: Single pole Relay Metrosil Units are normally supplied without
mounting brackets unless otherwise specified by the customer.
Metrosil units for relays with 5A CT
These Metrosil units have been designed to comply with the following requirements:

− At the relay voltage setting, the Metrosil current should be less than 100mA rms (the
actual maximum currents passed by the units shown below their type description)

− At the maximum secondary internal fault current the Metrosil unit should limit the
voltage to 1500V rms for 0.25 second. At the higher relay settings, it is not possible to
limit the fault voltage to 1500V rms, hence higher voltage have to be tolerated
( indicated by * ,** , *** ).
The Metrosil units normally recommended for the used with 5 Amps CTs and single pole
relays are shown in the following table:

Secondary Recommended Metrosil Type

Internal fault
current Relay Voltage Setting

Amps rms Up to 200V rms 250V rms 275V rms 300V rms
600A/S1/S1213 600A/S1/S1214 600A/S1/S1214 600A/S1/S1223
50A C= 540/640 C= 670/800 C= 670/800 C= 740/870*
35mA rms 40mA rms 50mA rms 50mA rms
600A/S2/P/S1217 600A/S2/P/S1215 600A/S2/P/S1215 600A/S2/P/S1196
100A C= 470/540 C= 570/670 C= 570/670 C= 620/740*
35mA rms 75mA rms 100mA rms 100mA rms
600A/S3/P/S1219 600A/S3/P/S1220 600A/S3/P/S1221 600A/S3/P/S1222
150A C= 430/500 C= 520/620 C= 570/670** C= 620/740***
100mA rms 100mA rms 100mA rms 100mA rms

NOTE: * 2400V peak

** 2200V peak
*** 2600V peak
In some cases, single disc assemblies may be acceptable, contact
Schneider Electric for detailed information.
The Metrosil units used with 5 Amps CTs can also be used with triple
pole relays and consist of three single pole units mounted on the
same central stud but electrically insulated from each other. To order
these units please specify “Triple pole Metrosil type”, followed by the
single pole type reference.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 35/96

3. VOLTAGE PROTECTIONS
3.1 Setting for the Voltage Connections
For the P127, it is important to select the VTs configuration and VT protection in the
Configuration/ General Options/ VT Connection and VT protection submenu in according to
the relay wiring for a corrected functionality of the voltage protections.
Protection thresholds are not automatically converted when the protection mode is modified;
they are directly expressed into the set protection mode. So, if the protection mode is
modified, the thresholds have to be recalculated. For example, to keep the same protection
level when the mode is converted from P-P to P-N, it is necessary to divide thresholds by √3.
In the above mentioned is menu you will find that for the P127 relay there are three
configurations of VTs.
1. 3Vpn (Three phase-neutral connection):
In this configuration, the relay directly measures Ua, Ub, and Uc and calculates internally the
zero sequence voltage Ue = (1/3)[Ua+Ub+Uc]. This internal value Ue will be used to be
compared to the threshold of Ue (the Earth Overvoltage Protection threshold and to evaluate
the angle with the earth current for the earth fault directional protection). However, none UN
is displayed in the measurement Menu.
2. 2Vpn + Vr (Two phase-neutral plus an Open Delta connection):
In this configuration, the relay directly measures Ua and Ub. The input voltage of phase C of
the relay (terminals 73-74) which is connected to the summation of the three voltage phases
is used to be compared to the Ue (The earth Overvoltage Protection function threshold). This
voltage at C input is considered as Ur and it is displayed in the measurement menu as UN.
Moreover for the phase Overvoltage and Undervoltage protection functions, the phase C
voltage value Uc is internally reconstituted using the equation:

− Uc = Ua+Ub+Ur. This value will be compared to the U/V or O/V threshold in case of a
fault in phase C. Uc is not displayed in the measurement menu,

− The reconstruction is valid if the Ur is measured from a transformer with 5 limb,

− two used for the phase voltage Ua and Uc and the others used in Open delta
configuration for the Ur.
BE CAREFUL: IF THE Ur IS MEASURED FROM A SEPARATE TRANSFORMER THE
ABOVE RECONSTRUCTION IS NOT VALID AND CAN NOT BE USED.
3. 2Vpp + Vr (Two phase-phase plus an Open Delta connection):
The relay directly measures Uab and Ubc, the phase to phase (A-C) voltage value Uca is
internally reconstituted using the equation Uca=Uab+Ubc.
The third input of voltage of the relay (terminals 73-74) can be connected to the output of a
delta transformer or to a dedicated voltage transformer, the measured value can be used to
compare to the earth overvoltage threshold.
This voltage is displayed in the measurement menu as UN and it is designed as the earth
voltage.
4. VT Protection:
This setting is only available for 3VPN or 2VPN+Vr connection:

− If “VT Protection” = “Protect P-P”, threshold (P-P voltage) is the P-N threshold
multiplied by √3 to match to wished physical thresholds. Example: U> flag will be
activated for measured P-N voltage higher than 57V, if threshold = 100V.

− if "VT Protection" = "Protect P-N", set thresholds are P-N voltages, and effective
thresholds used for protections algorithm are set thresholds multiplied by √3. Example:
U> flag will be activated for measured P-N voltage higher than 57V, if threshold = 57V.
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3.2 Consideration on the measurement menu

Why UN for the earth voltage measurement?
The neutral, earth or residual or zero sequence voltage are considered a single voltage and
because it is not possible to modify the label in the display we have used the following
terminology:

− Ue for the thresholds.

− UN for the measurement menu.

− UN in the fault recorder.

UN for the measurement and fault record menu is to intend residual, zero sequence voltage
earth voltage etc.
3.3 (59N) Zero Sequence Overvoltage Protection (P125, P126 & P127)
On a healthy three phase power system, the addition of each of the three phase to earth
voltages is nominally zero, as this results from the vector addition of three balanced vectors
set at 120° to one another. However, when an earth fault occurs on the primary system this
balance is upset and a ‘residual’ voltage is produced. This can be measured, for example, at
the secondary terminals of a voltage transformer having a “broken delta” secondary
connection. Hence, a residual voltage-measuring relay can be used to offer earth fault
protection on such a system. Note that this condition causes a rise in the neutral voltage with
respect to earth, which is commonly referred to as “neutral voltage displacement”.
3.3.1 Setting Guidelines
The voltage setting applied to the protection elements is dependent upon the magnitude of
residual voltage that is expected to occur during an earth fault condition.
This in turn is dependent upon the method of system earthing employed. It must also be
ensured that the relay is set above any standing level of residual voltage that is present on
the system.
The protection element has one programmable element with delay time tUe>>>>.
The setting range and the functionality limits for the residual over-voltage are described in
the TD chapter, the setting menu is described in the User Guide chapter.
3.4 (27) Undervoltage Protection (P127)
Under-voltage conditions may occur on a power system for a variety of reasons, some of
which are outlined below:
Increased system loading
Generally, some corrective action would be taken by voltage regulating equipment such as
AVRs or On Load Tap Changers, in order to bring the system voltage back to its nominal
value. If this voltage regulating equipment is unsuccessful in restoring healthy system
voltage, then tripping by means of an under-voltage relay will be required following a suitable
time delay.
Faults occurring on the power system result in a reduction in voltage of the phases involved
in a fault. The proportion by which the voltage decreases is directly dependent upon the type
of fault, method of system earthing and it’s location with respect to the relay installation point.
Consequently, co-ordination with other voltage and current-based protection devices is
essential in order to achieve sufficient discrimination.
Complete loss of bus-bar voltage
This may occur due to fault conditions present on the incomer or busbar itself, resulting in
total isolation of the incoming power supply. For this condition, it may be a requirement for
each of the feeders to be isolated, so that when supply voltage is restored, the load is not
connected. Hence, the automatic tripping of a CB on a feeder upon detection of complete
loss of voltage on the busbar may be required. This may be achieved by a three-phase
undervoltage protection element.
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MiCOM P125/P126 & P127 Page 37/96

3.4.1 Setting Guidelines

In the majority of applications, undervoltage protection is not required to operate during
system earth fault conditions. If this is the case, the protection element should be selected in
the menu to operate from a phase-to-phase voltage measurement, as this quantity is less
affected by the decrease of a single-phase voltage due to an earth fault.
The voltage threshold setting for the undervoltage protection element should be set at some
value below the voltage decreases which may be expected under normal system operating
conditions. This threshold is dependent upon the system in question but typical healthy
system voltage decreases may be in the order of -10% of nominal value.
The undervoltage protection element has two programmable thresholds with delay timers:
tU<, tU<<
After a trip command the thresholds will be reset when all phase voltages have risen above
105% of setting values.
The undervoltage protection element, which can be set as OR or AND logic, operates by
comparing each UAB, UBC and UCA voltage input with the U<, U<< thresholds.
The relay continuously monitors the phase-to-phase voltages.
NOTE: If the relay is connected in the mode 3 Vpn to control the phase to
neutral voltages, the thresholds must be multiplied by 3.
Exemple with a 400V analog VT input and a setting at 85% of this voltage:
– if this voltage is a phase to phase (Vpp) setting, U< = 85% x Un, the setting will
be 340V
– if this voltage is a phase to neutral (Vpn = 230V) setting, U< = (85% x Un) x
3 , the setting will be 340V
When OR operating logic is set and one or more voltage values fall below the threshold
value, the tripping command is sent after the tripping timer has reached the set overtime
condition.
When AND operating logic is set and all of the voltage values have fallen below the
threshold value, the tripping command is sent after the tripping timer has reached the set
overtime condition.
The protection element under-voltage has two programmable thresholds with definite delay
time tU< and tU<<.
The two thresholds can be individually inhibited when circuit breaker is opened (52A).
Information as to the thresholds setting range can be found in the FT and TD parts of the
technical guide.
3.5 (59) Overvoltage Protection (P127)
As previously discussed, under-voltage conditions are relatively common, as they are related
to fault conditions etc. However, over-voltage conditions are also a possibility and are
generally related to loss of load conditions as described below.
Under load shedding conditions, the supply voltage will increase in magnitude. This situation
would normally be rectified by voltage regulating equipment such as AVRs or on-load tap
changers. However, failure of this equipment to bring the system voltage back within
prescribed limits, leaving the system with an over-voltage condition which must be cleared in
order to preserve the life of the system insulation. Hence, over-voltage protection, which is
suitably time delayed to allow for normal regulator action, may be applied. During earth fault
conditions on a power system there may be an increase in the healthy phase voltages.
Ideally, the system should be designed to withstand such over-voltages for a defined period
of time.
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Normally, there will be a relay with a primary protection element employed to detect the earth
fault condition and to issue a trip command if the fault is non-cleared after a nominal time.
However, in this instance it would be possible to use a relay with an over-voltage protection
element as back-up protection. Sufficient would be a single stage of protection, having a
definite delay time.
3.5.1 Setting Guidelines
The relay with this type of protection element must be co-ordinated with any other over-
voltage relay at other locations on the system. This should be carried out in a similar manner
to that used for grading current operated protection devices.
The protection element over-voltage has two programmable thresholds and two delay timers,
tU>, tU>>.
After a trip command the thresholds will be reset when all phase voltages have fallen below
95% of setting values.
The overvoltage protection element, which can be set as OR or AND logic, operates by
comparing each UAB, UBC and UCA voltage input with the U>, U>> thresholds.
NOTE: If the relay is connected in the mode 3Vpn to control the phase to
neutral voltages, the thresholds must be multiplied by 3.
When OR operating logic is set and one or more voltage has risen above the threshold
value, the tripping command is sent after the tripping timer has reached the set overtime
condition.
When AND operating logic is set and all of the voltage values have risen above the threshold
value, the tripping command is sent after the tripping timer has reached the set overtime
condition.
Information as to the thresholds setting range can be found in the FT and TD parts of the
technical guide.
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MiCOM P125/P126 & P127 Page 39/96

4. OTHER PROTECTION FUNCTION INTEGRATED IN P127

4.1 Under/Over frequency (81 U/O)
4.1.1 Description
Time delayed under and over frequency protection available on P127 provides the
fundamental form of frequency protection.
Six thresholds are available: Each one can be configured to detect an under or over
frequency within the range [fn – 4,9Hz, fn + 4,9Hz], where fn is the nominal frequency
selected (50Hz or 60Hz). A definite timer is assigned to each threshold.
When the frequency measured is crossing one of the 6 pre-defined thresholds, the relays
generates a start signal and after a user settable time delay, a trip signal.
NOTE: Under / Over frequency protection is available when voltage inputs are
connected.
4.2 Rate of frequency change protection (dF/dt) (81R)
4.2.1 Description
The calculation of the rate of change of frequency is an average measurement of the
instantaneous values over a programmable number of cycles (1 to 200); refer to the
‘CONFIGURATION / General options" menu. The instantaneous values of rate of change of
frequency are measured every cycle (20ms at 50Hz). The rate of frequency change
elements are very important to detect any power loss under severe disturbances and
eventually perform load shedding of secondary load.
These elements offer the possibility to detect the tendency of the variation of frequency, and
thus re establish the correct load/generation without waiting for big frequency reduction.
These elements could be combined to the frequency elements using the AND logic
equations to provide a very useful mechanism allowing a more secure trip decision to be
achieved during transient system disturbances.
According ‘CONFIGURATION / General options’ setting, this function will be inhibited in the
following case:

− if the voltage level for each phase is below the settable undervoltage blocking value
(see “Prot. Freq. Block U<” cell),

− if the frequency is out of range: fmeasured > (fn+20Hz) or fmeasured < (fn–20Hz),

− if dF/dt > ±20hz/s and “Inhib. dF/dt>20Hz/s” is set to “No”.

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4.2.2 dF/dt functionning

f i-2 f i-1 fi f i+1

fi - 2 - fi - 3
df /dti - 2 =
ti - 2 - ti - 3

fii -- 12 - fii -- 32
df /dti - 1 =
ti - 1 - ti - 2

fi - fi - 1
df /dti =
ti - ti - 1

fi + 1 - fi
df /dti + 1 =
ti + 1 - ti
P0399ENa

The rates of change of frequency are calculated every cycle based upon zero crossing.
NOTE: To be insensitive to the phase shift and vector jumps, we can reject all
measurements of dF/dt greater than 20Hz/s.
Application Guide P12y/EN AP/E95

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CONFIGURATION
General Options
dF/dt Cycles.nb = 3 1 2 3
dF/dt Cycles.nb
3

CONFIGURATION
General Options
At the end of the three instantaneous dF/dt
dF/dt Validat.nb = 2 measurement cycle, the first average value
is calculated.and compared to the dF/dt
dF/dt Validat.nb threshold set in the 'Protection / [81R] Freq. PROTECTION
2 change of rate / dF/dt1' menu. [81R] Freq. rate of change
df/dt1 + df/dt 2 + df/dt3
dF / dtaverage1 = dF/dt 1 =
3

The second average value is calculated dF/dt1 =

using the next dF/dt measurement cycle. 0.5 Hz/s
This second average value is compared
to the dF/dt threshold set in the
'Protection/ [81R] Freq. change of rate/
dF/dt1' menu.
df/dt1 + df/dt 2 + df/dt3
dF / dtaverage2 =
3

df/dt1 df/dt2 df/dt3

dF/dtaverage2

CONFIGURATION
1 2 3 df/dt1 df/dt2 df/dt3
General Options
dF/dt Cycles.nb = 3
dF/dtaverage1 1 2 3
dF/dt Validat.nb = 2 Validation

P3974ENa

With “dF/dt Validation nb = 2”, the rate of change of frequency:

− will be validated when dF/dtaverage1 and dfF/dtaverage2 exceed df/dt1 setting value
(protection menu).

− will not be validated when only one of the average value exceeds df/dt1 setting value.
NOTE: The rate of change of frequency is available when voltage inputs are
connected.
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4.3 3 phases directional Over / Under power (32)

4.3.1 Description
MiCOM P127 provides the three-phase power protection which monitors the active and
reactive power limits and detects (when selected):

− active overpower value on thresholds P> and P>>,

− reactive overpower value on thresholds Q> and Q>>,

− active underpower value on thresholds P< and P<<,

− reactive underpower value on thresholds Q< and Q<<.

A definite timer is assigned to each threshold. When the active and reactive power
measurements are inside the trip zone, the relays generates a start signal and after a user
settable time delay, a trip signal.
The directional angle between active (or reactive) over / under power and triggering power
can be adjusted between 0° and 359°.

P Q

Triggering power Triggering power

Q>
P> Active power (P) an
and dQ Reactive power (Q)
P>> >>

Trip Tri
zon p zo
e ne
Q<
an
P< dQ
and Directional << T Angle
P<< rip
Angle zo
Trip ne
zon
e

2° 0
0
2°

270 270
90 90
Q P
2°
2°
180 180

Directional Active Over / Under protection Directional Reactive Over / Under protection
P3969ENa

4.3.2 Power Measurement displayed

For the P127, it is important to select the VTs configuration in the Configuration/ General
Options/ VT Connection submenu in according to the relay wiring for a corrected functionality
of the power protections (See 3.1).
3Vpn (Three phase-neutral connection)
2Vpn + Vr (Two phase-neutral plus an Open Delta connection)
2Vpp + Vr (Two phase-phase plus an Open Delta connection)
NOTE: P> “100x 1W” if the secondary of the CT = 1A, and the setting of P> = 100W

“P> “100x 5W” if the secondary of the CT = 5A, and the setting of P> = 500W
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 43/96

Example1:
VT connection = 3Vpn
CT Ratio = 100A / 1A
VT Ratio = 2kV / 100V
I = 10A primary = 100mA secondary injected on the 3 phases,
V = 1155V primary = 57.7V secondary injected on the 3 phases
Phase Difference = 0 degrees
P= 57.7 x 0.1 cos (0) + 57.7x 0.1 cos (0) + 57.7 x 0.1 cos (0) = 17.3 W sec
or 17.3 x CT Ratio x VT Ratio x K (K= CT 1A or 5A) = 17.5 x 100 X 20 x 1 = 35000 W
Primary

4.3.2.1 Active power (P)

The calculation of the active power is:
For a 3 Vpn or a 2Vpn+Vr connection:
P = Ua * Ia * cos(Ua ∧ Ia) + Ub * Ib * cos(Ub ∧ Ib) + Uc * Ic * cos(Uc ∧ Ic)
Sn = 3.In ⋅ Un
For a 2Upp+Vr connection:
P = Uab * Ia * cos(Uab ∧ Ia) − Ubc * Ic * cos(Ubc ∧ Ic)
Sn = 3.In ⋅ Un

P
P" =
3.KI ⋅ KU ⋅ Un
InTA ⋅ UnTV
P ' = InTA ⋅ UnTV ⋅ P" = P
3.KI ⋅ KU ⋅ Un

where:

− P the active power expressed in ADC (Analog to Digital Conversion) points

where In and Un are respectively the nominal current and voltage to the secondary side

− P” the active power to the secondary side expressed in Pn

− P’ the active power to the primary side expressed in Watt

Since these are measurements used only for protection purposes, they aren’t displayed on
HMI.

4.3.2.2 Reactive power (Q)

The calculation of the reactive power is:
For a 3 Vpn or a 2Vpn+Vr connection:
Q = Ua * Ia * sin(Ua ∧ Ia) + Ub * Ib * sin(Ub ∧ Ib) + Uc * Ic * sin(Uc ∧ Ic)

For a 2Upp+Vr connection:

Q = Uab * Ia * sin(Uab ∧ Ia) − Ubc * Ic * sin(Ubc ∧ Ic)

Q
Q" =
3.KI ⋅ KU ⋅ Un
InTA ⋅ UnTV
Q ' = InTA ⋅ UnTV ⋅ Q" = Q
3.KI ⋅ KU ⋅ Uan
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where:

− Q is the reactive power expressed in ADC (Analog to Digital Conversion) points

where In and Un are respectively the nominal earth current and voltage to the secondary
side

− Q” is the reactive earth power to the secondary side expressed in VAR

− Q’ is the reactive earth power to the primary side expressed in VAR

Since these are measurements used only for protection purposes, they aren’t displayed on
HMI.

4.3.2.3 Phase shifts of the power

The calculation of the phase shift of the power phi is:
Q
phi = arctan( )
P
4.3.3 Overview
Using a MiCOM P127 relay as a stand alone power relay provides a wide setting range, the
setting range available is dependent on the VT range ordered. The table below outlines the
settings available for each of the VT input ranges.

Analogue Input
CT Range (A) VT Range (V) P
P127AA 0.1 – 40 57 – 130 1 – 10000xk W with k = 1 or 5 A
P127AB 220 - 480 4 – 40000xk W with k = 1 or 5 A
P127BA 0.01 – 8 57 – 130 1 – 10000xk W with k = 1 or 5 A
P127BB 220 - 480 4 – 40000xk W with k = 1 or 5 A
P127CA 0.002 – 1 57 – 130 1 – 10000xk W with k = 1 or 5 A
P127CB 220 - 480 4 – 40000xk W with k = 1 or 5 A
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 45/96

5. DESCRIPTION AND SETTING GUIDE OF THE AUTORECLOSE

FUNCTION (P126 & P127)
5.1 Introduction
An analysis of faults on any overhead line network has shown that:

− 80 - 90% are transient in nature,

− the remaining 10-20% of faults are either non-permanent (arcing fault) or permanent.
A transient fault is a self-clearing ‘non-damage’ fault. This type of fault can be isolated and
cleared by the immediate tripping of one or more circuit breakers, and does not recur when
the line is re-energised. The most common cause of transient faults are lightning, insulator
flashover clashing conductors and wind blown debris.
The immediate trip will not clear a non-permanent or permanent fault, and the use of the
recloser may be necessary to clear it. A small tree branch falling on the line could cause a
non-permanent fault. Permanent faults could be broken conductors, transformer faults, cable
faults or machine faults that must be located and repaired before the supply can be restored.
Most of the time, if the faulty line is immediately tripped, and the fault arc has sufficient time
to de-ionise, reclose of the circuit breakers will result in the line being successfully re-
energised. Autoreclose schemes are used to automatically reclose a switching device once a
time delay has elapsed and starting after the CB has opened.
On HV and MV distribution networks, the autoreclose function is applied mainly to radial
feeders where system stability problems do not generally arise. Using the autoreclose
minimises time of interruption and reduces operating costs.
Automatic autorecloser allows a substation to operate unattended:the number of visits to
manually reclose a circuit breaker is substantially reduced. This feature constitutes therefore
an important advantage for substations supervised remotely.
On circuits using time graded protection, the automatic autorecloser allows the use of
instantaneous protection to give a high speed first trip. With fast tripping, the duration of the
power arc resulting from an overhead line fault is reduced to a minimum, thus lessening the
chance of damage and to develop the transient fault into a permanent fault.
Using short time delay protection prevents blowing of fuses and reduces circuit breaker
maintenance by eliminating pre-arc heating when clearing transient faults.
The next figure shows an example of 4 autoreclose cycles (maximum numbers of allowed
cycles) to the final trip (in the following diagram, td1, td2, td3, td4 = dead time 1, 2, 3 and 4
timers, tr = Reclaim time, O = CB open and C = CB closed).
Current

O C O C O C O C O final trip

I threshold

td1 tr td2 tr td3 tr td4 tr

In

Time
Fault P0031ENa

TYPICAL AUTORECLOSE CYCLES

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When short time delay protection is used with autoreclose, the scheme is normally arranged
to block the instantaneous protection after the first trip. Therefore, if the fault persists after re-
closing, time-graded protection will give discriminative tripping with fuses or other protection
devices, resulting in the isolation of the faulted section. However, for certain applications,
where the majority of the faults are likely to be transient, it is not uncommon to allow more
than one instantaneous trip before the instantaneous protection is blocked.
Some schemes allow a number of re-closings and time graded trips after the first
instantaneous trip, which may result in the burning out and clearance of non-permanent
faults. Such an approach may also be used to allow fuses to operate in teed feeders where
the fault current is low.
Any decision to apply the autoreclose function would be influenced by all data known on the
frequency of transient faults (for instance feeders which consist partly of overhead lines and
partly of underground cables). When a significant proportion of the faults are permanent, the
advantages of autoreclose are small, particularly since re-closing on to a faulty cable is likely
to aggravate the damage.
5.2 Description of the function
5.2.1 Autorecloser activation
The autoreclose function is activated using “AUTOMAT. CTRL/ PROTECTION G1” menu.
The same settings apply for the Menu PROTECTION G2.
The autoreclose function of the relay is available only if the following conditions are verified:

− The auxiliary contact of the CB status 52a must be connected to the relay.
Refer to the “AUTOMAT. CTRL/Inputs” menu

− The trip output relay RL1 must not be latched to the earth and/or phase protection
function.
Refer to the “AUTOMAT. CTRL/Latch functions” menu
NOTE: If the auxiliary supply is lost during an autoreclose cycle, the
autoreclose function is totally disabled.

In addition to Autoreclose settings, the user will be able to fully link the autoreclose function
to the protection function using the menus “PROTECTION G1/Phase OC” and
“PROTECTION/E/Gnd”.
5.2.2 Logic Inputs
The autoreclose function has four inputs that can be assigned to the autoreclose logic.
These inputs can be opto-isolated inputs configured for that under the “AUTOMAT. CTRL”
menu. External contacts can then be wired to be used as an input and influence the
autorecloser scheme. These 4 inputs are:

− one external CB fail,

− two external starting orders,

− one external blocking order.

The following table gives the “AUTOMAT.CTRL/Inputs” menu assigned to the autoreclose
logic input. The second column presents the menu disabling the function if not assigned in
the “PROTECTION G1/Autoreclose” menu (Setting = No).

“Inputs” menu Enabled with:

External CB Fail CB FLT EXT CB FAIL
External starting orders Aux 1 CYCLES tAux1 *
Aux 2 CYCLES tAux2 *
External blocking order Block-79 Ext Block ?
* These two external orders can be independently disabled.
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5.2.2.1 External CB fail

Most of circuit breakers provide one trip-close-trip cycle. A delay time is necessary to return
to the nominal state of the CB (for example, the spring that allows the circuit breaker to close
should be fully charged). The state of the CB can be checked using an input assigned to the
“CB FLT” function. If on completion of the “Ext CB Fail time” (tCFE), the “CB FLT” indicates
a failed state of the CB, a lockout occur and the CB remains open.
5.2.2.2 External starting orders
Two independent and programmable inputs (Aux 1 and Aux 2) can be used to initiate the
autorecloser function from an external device (such as an existing overcurrent relay). These
logic inputs may be used independently and also in parallel with the MiCOM P123
Overcurrent settings.
5.2.2.3 Internal and external blocking order
The autoreclose can be blocked by an internal or an external control. It can be used when a
protection is needed without requiring the use of the autorecloser function.
The external block is the “Block 79” input.
The internal block can be a final trip, a number of A/R rolling demand valid or an A/R conflict.
A typical example is on a transformer feeder, where the autoreclose may be initiated from
the feeder protection but need to be blocked from the transformer protection side.
5.2.3 Autoreclose Logic Outputs
The following output signals can be assigned to a LED (see “CONFIGURATION / Led”
menu) or to the output relays (see “AUTOMAT.CTRL/Output Relays” menu) to provide
information about the status of the autoreclose cycle.

− Autoreclose in progress,

− Final Trip (internal or external activation).

The following table gives the “CONFIGURATION/Led” and the “AUTOMAT.CTRL/Output
Relays” menus used to assign the autoreclose output signal.

LED menu Output relays menu

Autoreclose in progress 79 Run 79 Run
Final Trip:
Autoreclose lock activated 79Int. Locked 79 int. Lock.
by the internal process of
the autoreclose
Autoreclose lock activated 79Ext. Locked 79 ext. Lock.
by the input “block 79”

5.2.3.1 Autoreclose in progress

The “Autoreclose in progress” signal is present during the complete reclose cycles from
protection initiation to the end of the reclaim time or lockout.
5.2.3.2 Final trip
The "Final trip" signal indicates that a complete autoreclose cycle has been completed and
that the fault has been cleared.
The "Final trip" signal can be reset after a manual closing of the CB after the settable “inhibit
time (tI)”.
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5.2.4 Autoreclose logic description

The autoreclose function provides the ability to automatically control the autorecloser (two,
three or four shot cycle, settable using “Phase Cycles” and “E/Gnd Cycles” menu). Dead
times for all the shots (reclose attempts) can be independently adjusted.
The number of shots is directly related to the type of faults likely to occur on the system and
the voltage level of the system (for instance medium voltage networks).
The Dead Time (tD1, tD2, tD3 and tD4) starts when the CB has tripped (when the 52a input
has disappeared). Dead Time is adjusted to start autoreclose when circuit breaker is closed.
NOTE: If an electromagnetic relay is used (working on the principle of disc in
the electromagnetic field due to eddy current generated in the disc),
an additional dead time, depending of the tripping cause, is settable.
At the end of the relevant dead time, “CB FLT” input is sent (see § 5.2.2.1).
The reclaim time (tR) starts when the CB has closed. If the circuit breaker does not trip
again, the autoreclose function resets at the end of the reclaim time.
If the protection operates during the reclaim time, the relay either advances to the next shot
that is programmed in the autoreclose cycle, or it locks out (see § 5.2.6).
The total number of reclosures is displayed under the “MEASUREMENTS/Reclose Stats”
menu.
5.2.5 Autoreclose Inhibit Following Manual Close
The “Inhib Time tI” timer can be used to block the autoreclose being initiated after the CB is
manually closed onto a fault. The Autoreclose is blocked during the “Inhib Time tI“ following
manual CB Closure.
5.2.6 Recloser lockout
If the protection element operates during the reclaim time, following the final reclose attempt,
the relay will lockout and the autoreclose function is disabled until the lockout condition
resets.
The lockout condition can reset by a manual closing after the "Inhib Time tI".
The Autoreclose can also be locked out using a “CB FLT” input. This information can be
issued from the "not charged" or "Low gas pressure" indications of CB springs.
Note that Autoreclose can also be locked by:

− The fact that the CB doesn’t open after tBf delay (CB Fail),

− An operating time that is above programmed thresholds.

5.2.7 Setting group change lockout
The change of setting groups is only possible if there are no protection or automation
functions running (except the thermal overload function). During the autorecloser cycle, if the
relay receives an order to change setting groups, this order is kept in memory, and will only
be executed after the timer has elapsed.
5.2.8 Rolling demand
This specific counter avoids a frequent operation of a CB in case of frequent intermittent
fault. The numbers of shoot can be adjusted from 1 to 100 in the cell “Max cycles nb”,
settable in a time period from 10min to 24 hours.
The rolling demand is used when a definite number of successfully recloses are made on a
definite time.
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5.3 Setting Guidelines

5.3.1 Number Of Shots
There is no perfect rule to define the number of shots for a particular application.
For medium voltage systems it is common to use two or three autoreclose shots, and, for
specific applications, four shots. Using four shots, final dead time can be set for a time long
enough to allow thunderstorms to stop before definitive final reclose. This scheme prevents
unnecessary lockout caused by consecutive transient faults.
Typically, the first trip, and sometimes the second, are caused by the instantaneous
protection. Since 80% of faults are transient, the following trips will be time delayed, and all
will have increasing dead times to clear non-permanent faults.
In order to determine the number of shots required; the first factor is the ability for the circuit
breaker to perform several trip-close operations in a short time and, the effect of these
operations on the maintenance period.
If a moderate percentage of non-permanent faults is present in a system, two or more shots
are justified. If fused ‘tees’ are used and the fault level is low, the timer of the fuses may not
discriminate with the main IDMT relay: several shots are usefull. This would not warm up the
fuse to a such extent that it would eventually blow before the main protection operated.
5.3.2 Dead Timer Setting
Load, circuit breaker, fault de-ionising time and protection reset are taken into consideration
when setting the dead timer.
5.3.3 Minimum drop-off time setting
If an electromagnetic relay is used (working on the principle of disc in the electromagnetic
field due to eddy current generated in the disc), an additional dead time (tI>, tI>>, tI>>>, tIe>,
tIe>> or tIe>>>) depending of the tripping cause is settable,
This function includes the choice to select an IDMT curve on the relay reset time, setting the
dropp-off time on phase and neutral autoreclose cycles.
This drop-off time blocks the next cycle if this one not elapsed.
A next cycle can be start if the dead time is elapsed and treset elapsed to.
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Reset time with AR and electromechanical relay - Evolution treset proposition

Including and IDMT curve after the trip and
- Today treset start the new cycle after the dead time and
IDMT reset finish.

Trip time Upstream relay Upstream relay

Trip

Downstream relay Downstream relay

Trip time
Trip Trip Trip
Trip time

Trip 1st cycle Trip 1st cycle Trip 2nd cycle

P0906ENa

NOTE: This function is currently used with IDMT curve.

If dead time > Drop-off time, the relay will close the CB at the end of
dead time.
If dead time < Drop-off time, the relay will close the CB at the end of
dropp-off time.
5.3.3.1 Load
It is very difficult to optimize the dead time due to the great diversity of load on a system.
However, it is possible to study each type of load separately and thereby be able to define a
typical dead time.
The most common types of loads are synchronous or induction motors and lighting circuits.
Synchronous motors tolerate only extremely short interruptions of supply without loss of
synchronism. In practice, the dead time should be sufficient to allow the motor no-volt device
to operate. Typically, a minimum dead time of 0.2-0.3 seconds is recommended.
Induction motors, on the other hand, can withstand supply interruptions, up to a maximum of
0.5 seconds and re-accelerate successfully. In general dead times of 3-10 seconds are
normally satisfactory, but there may be special cases for which additional time is required to
allow the reset of manual controls and safety devices.
Loss of supply of lighting circuits, such as street lighting, can lead to important safety
problems (car circulation). Regarding domestic customers, the main consideration is linked
to the inconvenience caused.
The number of minutes lost per year to customers will be reduced on feeders using the
autorecloser and will also be affected by the dead time settings used.
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5.3.3.2 Circuit Breaker

For high speed autoreclose, the minimum dead time of the power system depends on the
minimum time delay imposed by the circuit breaker during a trip and reclose operation.
Since a circuit breaker is a mechanical device, it has an inherent contact separation time.
This operating time for a modern circuit breaker is usually within the 50-100ms range, but
could be longer with older designs.
NOTE: The closing pulse time delay (adjusted using ‘AUTOMAT. CTRL / CB
Supervision / tClose Pulse’ setting) should be higher than the time
delay necessary to close the CB (mechanical closing and CB Closing
loop). In the same way, the opening pulse time delay (‘AUTOMAT.
CTRL / CB Supervision / tOpen Pulse’ setting) should be higher than
the time delay necessary to open the CB. Otherwise, the autorecloser
can be locked.
Once the circuit breaker has reset, the breaker can start to close. The period of time
between the energisation of the closing mechanism and the making of the contacts is called
closing time. Because of the time constant of a solenoid closing mechanism and the inertia
of the plunger, a solenoid closing mechanism may take 0.3s. A spring operated breaker, on
the other hand, can close in less than 0.2 seconds.
Where high speed reclosing is required, for the majority of medium voltage applications, the
circuit breaker mechanism dictates itself the minimum dead time. However, the fault de-
ionising time may also have to be considered.
High speed autoreclose may be required to maintain stability on a network that has two or
more power sources. For high speed autoreclose, the system disturbance time should be
minimised using fast protection, <50 ms, such as distance or feeder differential protection
and fast circuit breakers < 100 ms. Fast fault clearance can reduce the time for the fault arc
to de-ionise.
To ensure stability between two sources, a dead time of <300 ms is typically required.
Considering only the CB, this minimum time corresponds to the reset time of the mechanism
plus the CB closing time. Thus, a solenoid mechanism is not adapted for high speed
autoreclose due to the fact that the closing time is generally too long.
5.3.3.3 Fault De-ionising Time
For high speed autoreclose, the time to de-ionise faults may be the factor the most important
when considering the dead time. This is the time required for the ionised air to disperse
around the fault position so that the insulation level of the air is restored. This time may be
around the following value:
De-ionising time = (10.5 + ((system voltage in kV)/34.5)) / frequency
For 66 kV = 0.25 s (50Hz)
For 132 kV = 0.29 s (50 Hz)
5.3.3.4 Protection Reset
It is essential that the protection fully resets during the dead time, so that correct time
discrimination is maintained after reclose on to a fault. For high speed autoreclose,
instantaneous reset of protection is required.
Typical 11/33kV dead time settings in the UK are as follow:
1st dead time = 5 - 10 seconds
2nd dead time = 30 seconds
3rd dead time = 60 - 100 seconds
4th dead time (uncommon in the UK, however used in South Africa) = 60 - 100 seconds
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5.3.4 Reclaim Timer Setting

The following factors influence the choice of the reclaim timer:

− Supply continuity - Large reclaim times can result in unnecessary lockout for transient
faults.

− Fault incidence/Past experience - Small reclaim times may be required where there is
a high incidence of lightning strikes to prevent unnecessary lockout for transient faults.

− Charging time of the spring or resetting of electromagnetical induction disk relay - For
high speed autoreclose, the reclaim time may be set longer than the spring charging
time to ensure that there is sufficient energy in the circuit breaker to perform a trip-
close-trip cycle. For delayed autoreclose, this setting is of no need as the dead time
can be extended by an extra CB healthy check window time if there is insufficient
energy in the CB. If there is insufficient energy after the check window time the relay
will lockout.

− Switchgear Maintenance - Excessive operation resulting from short reclaim times can
mean shorter maintenance periods. A minimum reclaim time of 5s may be needed to
give sufficient time to the CB to recover after a trip and close before it can perform
another trip-close-trip cycle.
The reclaim time must be long enough to allow any time delayed protection leading to
autoreclose to operate. Failure to do so can cause the autoreclose scheme to reset too soon
and the reactivation of the instantaneous protection.
If that were the case, a permanent fault would look like some transient faults, caused by
continuous autorecloses. Applying a protection against excessive fault frequency lockout is
an additional precaution that can solve this problem.
It is possible to obtain short reclaim times to obtain less lockouts of the CB by blocking the
reclaim time from the protection start signals. If short reclaim times are to be used, then the
switchgear rating may dictate the minimum reclaim time.
Sensitive earth fault protection is used to detect high resistance earth faults. The time delay
of such protections is usually a long time delay, typically about 10-15s. If autoreclose is
generated by the SEF protection, this timer must be taken into account when deciding the
value of the reclaim time, if the reclaim time is not blocked by an SEF protection start signal.
Sensitive earth faults, caused by a broken overhead conductor in contact with dry ground or
a wood fence are rarely transient faults and may be dangerous to people.
It is therefore common practice to block the autoreclose using the sensitive earth fault
protection and lockout the circuit breaker.
Where motor-wound spring closed circuit breakers are used, the reclaim time must be at
least as long as the spring winding time for high speed autoreclose to ensure that the
breaker can perform a trip-close-trip cycle.
A typical 11/33kV reclaim time is 3-10 seconds, this prevents unnecessary lockout during
thunderstorms. However, times up to 60-180 seconds maybe used.
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5.3.5 Autoreclose setting guideline

5.3.5.1 General setting

SETTING CONDITION FOR THE ARC FUNCTIONALITY

“PROTECTION Gx / [79] AUTORECLOSE”
“Autoreclose” Yes
“Phase Cycles” or/and “E/GND Cycles” At least 1 If the cycle = 0 none autoreclose
available
“Cycles xxxx” 1234 Max number cycle:
0111
max. 4 cycles
“AUTOMA. CTRL / INPUTS”
One of the digital inputs. The relevant 52a This input must be in accordance with
input must be configured as Active High the CB position: HIGH with CB close,
LOW with CB opened.

“AUTOMA. CTRL / OUTPUTS RELAYS”

“CB Close & SOTF” CB Close This relay must be only assigned to this
function.
One of the relays from 2 to 8
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5.3.5.2 Trip and reclose (normal operation)

Autoreclose starts only if tripping order (RL1) has been performed (Trip & Start).
Red LED of trip will always come whenever autoreclose starts.

“PROTECTION Gx / [79] AUTORECLOSE”

“Autoreclose” Yes
“Phase Cycles” or/and “E/GND Cycles” At least 1 If the cycle = 0 none autoreclose
available
Cycles tI>, tI>>, tI>>>, tIe>, tIe>>, tIe>>>, 1234 Max number cycle:
tPe/IeCos>, tPe/IeCos>> 0111
max. 4 cycles

“AUTOMA. CTRL / TRIP COMMANDS”

Trip Commands At least a trip Overcurrent and/or earth fault
command. overcurrent trip thresholds
(One of them is enough)
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5.3.5.3 Autoreclose only (external trip)

Since v11.B version, it is now possible to inhibit trip order (tick Trip & Inhib trip) in the
settings file to work like a standalone autorecloser (see the next figure).
In the following configuration:

− tAux is removed from Trip commands,

− No trip is performed from autoreclose function,

− Trip LED will remain OFF.

“PROTECTION Gx / [79] AUTORECLOSE”

“Autoreclose” Yes
“Phase Cycles” or/and “E/GND Cycles” At least 1 If the cycle = 0 none autoreclose
available
“Cycles tAux1” For each cycle used, enable “trip and
“Cycles tAux2” start cycle” AND “Inhib trip on cycle”

To achieve “autoreclose only” setting, external start should be wired on a digital input. This
digital input should be assigned to tAux1 and/or tAux2.

“AUTOMA. CTRL / INPUTS”

Automat control inputs Aux Select on Automat control input Aux

Within Autorecloser menu, both “strip and start” and “inhib trip” should be selected for tAux1
and/or tAux2.
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To avoid any trip when tAux is ON, ensure that tAux is not selected in trip command menu.

“AUTOMA. CTRL / TRIP COMMANDS”

Trip Commands Trip command Untick the corresponding tAux
without tAux

5.3.6 Number Of Shots

There are no clear-cut rules for defining the number of shots for a particular application.
Generally medium voltage systems utilize only two or three shot autoreclose schemes.
However, in certain countries, for specific applications, four shot approaches are not
uncommon. Four shots have the advantage that the final dead time can be set sufficiently
long to allow any thunderstorms to pass before re-closing for the final time. This approach
will prevent unnecessary lockout for consecutive transient faults.
Typically, the first trip, and sometimes the second, will result from short time protection.
Since 80% of faults are transient, the subsequent trips will be time delayed, all with
increasing dead times to clear non-permanent faults.
In order to determine the required number of shots the following factors must be taken into
account:
An important consideration is the ability of the circuit breaker to perform several trip-close
operations in quick succession and the effect of these operations on the maintenance period.
If statistical information on a particular system shows a moderate percentage of non-
permanent faults, which could be burned out, two or more shots are justified. In addition to
this, if fused ‘tees’ are used and the fault level is low, the fusing time may not discriminate
with the main IDMT relay and it would then be useful to have several shots. This would warm
up the fuse to such an extent that it would eventually blow before the main protection
operated.
5.3.7 Dead Timer Setting
The following factors can influence the choice of dead timer setting. Due to the great
diversity of load, which may exist on a system it may prove very difficult to arrive at an
optimum dead time. However, it is possible to address each type of load individually and
thereby arrive at a typical dead time. The most common types of load are addressed below.
Synchronous motors are only capable of tolerating extremely short interruptions of supply
without loss of synchronism. In practice it is desirable to disconnect the motor from the
supply in the event of a fault. The dead time should be sufficient to allow the motor no-volt
device to operate. Typically, a minimum dead time of 0.2 - 0.3 seconds has been suggested
to allow this device to operate. Induction motors, on the other hand, can withstand supply
interruptions, up to a maximum of 0.5 seconds and then re-accelerate successfully. In
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general dead times of 3 - 10 seconds are normally satisfactory, but there may be special
cases for which additional time is required to permit the resetting of manual controls and
safety devices.
Loss of supply to lighting circuits, such as street lighting may be important for safety reasons
as intervals of 10 seconds or more may be dangerous for traffic. The main considerations of
supply interruptions for domestic customers are those of inconvenience.
An important measurement criterion for many power utilities is the number of minutes lost
per year to customers, which will be reduced on feeders using autoreclose and will also be
affected by the dead time settings used.
For high-speed autoreclose the minimum dead time of the power system will depend on the
minimum time delays imposed by the circuit breaker during a tripping and re-closing
operation.
Since a circuit breaker is a mechanical device, it will have an inherent contact separation
time. The operating time for a modern circuit breaker is usually within the range of 50 - 100
ms, but could be longer with older designs.
After tripping, time must be allowed for the mechanism to reset before applying a closing
pulse. This resetting time will vary depending on the circuit breaker, but is typically 0.1
seconds.
Once the circuit breaker has reset, it can begin to close. The time interval between the
energizing of the closing mechanism and the making of the contacts is termed the closing
time. Owing to the time constant of a solenoid closing mechanism and the inertia of the
plunger, a solenoid closing mechanism may take 0.3 s. A spring-operated breaker, on the
other hand, can close in less than 0.2 seconds.
Where high-speed re-closing is required, which is true for the majority of medium voltage
applications, the circuit breaker mechanism itself dictates the minimum dead time. However,
the fault de-ionizing time may also have to be considered. High-speed autoreclose may be
required to maintain stability on a network with two or more power sources. For high-speed
autoreclose the system disturbance time should be minimized by using fast protection, <50
ms, such as distance or feeder differential protection and fast circuit breakers <100 ms. Fast
fault clearances can reduce the required fault arc de-ionizing time.
For stability between two sources a dead time of <300 ms may typically be required. When
only considering the CB the minimum system dead time is given by the mechanism reset
time plus the CB closing time. Thus, a solenoid mechanism will not be suitable for high-
speed autoreclose as the closing time is generally too long.
For high-speed autoreclose the fault de-ionizing time may be the most important factor when
considering the dead time. This is the time required for ionized air to disperse around the
fault position so that the insulation level of the air is restored. This can be approximated from
the following formula:

⎛ Vsys ⎞ 1
De-ionizing time = ⎜10.5 + ⎟× [s] (Vsys = System voltage in kV)
⎝ 34.5 ⎠ frequency

For 66 kV = 0.25 s (50Hz)

For 132 kV = 0.29 s (50 Hz)
It is essential that the protection fully resets during the dead time, so that correct time
discrimination will be maintained after re-closing on to a fault. For high-speed autoreclose
instantaneous reset of protection is required.
Typical 11/33kV dead time settings in the UK are as follows:
1st dead time = 5 - 10 seconds
2nd dead time = 30 seconds
3rd dead time = 60 - 100 seconds
4th dead time (uncommon in the UK, however used in South Africa) = 60 - 100 seconds
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5.3.7.1 Reclaim Timer Setting

A number of factors influence the choice of the reclaim timer, such as:

− Supply continuity - long reclaim times can result in unnecessary lockout for transient
faults.

− Fault incidence and past experience - short reclaim times may be required where
there is a high incidence of lightning strikes to prevent unnecessary lockout for
transient faults.

− Spring charging time - for high-speed autoreclose the reclaim time may be set longer
than the spring charging time to ensure there is sufficient energy in the circuit breaker
to perform a trip-close-trip cycle. For delayed autoreclose there is no need to set the
reclaim time longer than the spring charging time as the dead time can be extended
by an extra CB healthy check window time if there is insufficient energy in the CB. If
there is insufficient energy after the check window time has elapsed the relay will
lockout.

− Switchgear maintenance - excessive operation resulting from short reclaim times can
mean shorter maintenance periods. A minimum reclaim time of >5 s may be needed to
allow the CB time to recover after a trip and close operation before it can perform
another trip-close-trip cycle. This time will depend on the duty (rating) of the CB.

− The reclaim time must be long enough to allow any time-delayed protection initiating
autoreclose to operate. Failure to do so would result in premature resetting of the
autoreclose scheme and re-enabling of instantaneous protection.

− If this condition arose, a permanent fault would effectively look like a number of
transient faults, resulting in continuous autoreclose operations unless additional
measures were taken to overcome this, such as excessive fault frequency lockout
protection.

− A sensitive earth fault protection is usually applied to detect high resistance earth
faults.
Usually, a long trip delay time is set, typically 10 - 15 s. This longer time may be taken
into consideration, if autoreclose is started by an earth fault protection, and when
deciding on a reclaim time, if the reclaim time is not blocked by a SEF protection start
signal. Sensitive earth faults, for example, a broken overhead conductor in contact
with dry ground or a wood fence, is rarely transient and presents great danger to
persons and animals. It is therefore common practice to block autoreclose by
operation of sensitive earth fault protection and lockout the circuit breaker.

− Where motor-wound spring closed circuit breakers are used, the reclaim time must be
at least as long as the spring winding time for high-speed autoreclose to ensure that
the breaker can perform a trip-close-trip cycle.

− A typical 11/33kV reclaim time is 3 - 10 seconds; this prevents unnecessary lockout

during thunderstorms. However, reclaim times up to 60 - 180 seconds maybe used.
5.3.8 Fuse application
An application of the ARC is the coordination with a fuse. This application is typical in rural
areas where derived lines are protected by a fuse.

We suppose to have the following settings for the protection and the ARC narrow to the
configuration matrix. All the others have to be compliance with the rules above.
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67 protection
I> ON I>> ON
I> 8 In I>> 10 In
tI> 5 sec. tI>> 0 sec
AUTORECLOSE
(only the matrix)
ARC cycles 4321
AR init tI> 0110
ARC cycles 4321
AR init tI>> 0021
ARC cycles 4321
AR init tI>>> 0000
ARC cycles 4321
AR init tAux1 0000
Number of phase 1
cycles

The sequence is the following.

1. Fault on the line protected by the fuse.

2. Istantaneous trip of the I>> and opening of the CB.

3. tD1 in progress.
4. tD1 is expired.
5. Closing of the CB and start of the tR.
Due to the setting of the ARC the I>> will start but won’t generate a trip. During the
delay trip time of the I> the fault will be cleared for the breaking of the fuse or for the
auto-extintion of the fault.
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Breaker of the fuse

Auto-extinction of the fault

The above one is an example to show a basic using of the “2” setting in the ARC function.
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6. AUTOMATIC CONTROL FUNCTIONS

6.1 Trip Commands
This menu is used to assign the trip of the protection and the automatic control function to
the relay 1. See the P12y/EN FT (User Guide).
The relay 1 is usually used for the trip of the CB and the logic output is used to start all the
functionality relevant to the CB control.
6.2 Latch relays
Sometimes it occurs to memorise trips or alarms.
By this menu it is possible the latching of the relay from 1 to 8 the relevant relays to the 79
function must not be assigned latched.
6.3 Broken Conductor Detection (P126 & P127)
The majority of faults on a power system occur between one phase and ground or two
phases and ground. These are known as shunt faults and arise from lightning discharges
and other overvoltages, which initiate flashover. Alternatively, they may arise from other
causes such as birds on overhead lines or mechanical damage to cables etc.
Such faults induce an appreciable current increase and are easily detectable in most
applications.
Another type of unbalanced system condition is the series or open circuit fault. This fault can
arise from broken conductors, mal-operation of single-phase switchgear, or the operation of
fuses.
Series faults will not induce an increase in phase current on the system and hence are not
easily detectable by standard overcurrent protection elements available with common relays.
However, they will produce an unbalance and an important level of negative phase
sequence current, which can be detected.
It is possible to apply a negative phase sequence overcurrent relay to detect a series fault
condition as described. However, on a lightly loaded line, the negative sequence current
resulting from a series fault condition may be very close to, or less than, the full load steady
state unbalance arising from CT errors, load unbalance etc. A negative sequence protection
element therefore would not operate at low load levels.
The MiCOM P126 and P127 relays incorporate a protection element, which measures the
ratio of negative to positive phase sequence current (I2/I1). This protection element will be
affected to a lesser extent than the measurement of negative sequence current alone, since
the ratio is approximately constant with variations in load current. Hence, a more sensitive
setting may be achieved.
6.3.1 Setting Guidelines
In the case of a single point earthed power system, there will be little zero sequence current
flow and the ratio of I2/I1 that flows in the protected circuit will approach 100%. In the case of
a multiple earthed power system (assuming equal impedance in each sequence network),
the ratio I2/I1 will be 50%.
The setting for the broken conductor protection element is described in Technical Data and
the menu is described in User Guide.
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6.3.2 Example Setting

The following information was recorded by the relay during commissioning:
full load = 500A
I2 = 50A
therefore the quiescent ratio for I2/I1 is given by:
I2/I1 = 50/500 = 0.1
To allow for tolerances and load variations a setting of 200% of this value may be typical:
Therefore set RATIO I2/I1 = 20%
Set tBC = 60 s to allow adequate time for short circuit fault clearance by time delayed
protections.
6.4 Inrush Blocking (P127 only)
The inrush blocking function assumes stability protection during transformer energising
based on harmonic 2 presence.
In applications where the sensitivity of overcurrent thresholds need to be set below the
prospective peak inrush current, the inrush block function can be used to block the
overcurrent, earth fault and negative sequence overcurrent stages. During transformer
inrush conditions, the second harmonic component of the inrush current may be as high as
70%. In practice, the second harmonic level may not be the same for all phases during
inrush and therefore the relay will provide an Inrush Blocking signal for any phase above the
set threshold. In general, a setting of 15% to 20% for the Inrush harmonic 2 ratio can be
applied in most cases taking care that setting it too high, inrush blocking may not operate for
low levels of second harmonic current which may result in the O/C element tripping during
transformer energization. Similarly applying a too low a setting, inrush blocking may prevent
tripping during some internal transformer faults with significant second harmonic current.
6.4.1 Overview
Inrush Blocking function operates by measuring ratio of second to fundamental harmonic
current. It could be used as “blocking logic” of I >, I >>, I >>>, I0 >, I0 >>, I0 >>>, Ie>>>>,
I2 >, I2 >> or I2 >>> in case the harmonic 2 ratio is higher than the settable threshold.
Indeed, inrush blocking functions will reset selected protection function starting.
The minimum duration of overcurrent threshold inhibition (tReset) can be also set. This value
depends on the transformer power transient inrush duration: between 0.1 second (for a
100kVA transformer) to 1.0 second (for a large unit). It is used to avoid any maloperation
during a fixed duration in case of too sensitive setting.
6.4.2 Operation
For each of the three phases currents (IA, IB, IC), the harmonic restraint function compares
the ratio of harmonic 2 to fundamental with the setting ratio (adjustable from Harmonic 2 /
Fundamental = 10 % up to 35 % step 1%).
Minimum fundamental current value required for operation of Inrush Blocking function. There
is 0.2In, and there is no upper limit to disable this feature. However, in transformer
protection, the high set overcurrent stage shall not be controlled by this Inrush Blocking
feature; this enables detection of all high current faults without inrush blocking.
Inrush Blocking feature will block selected protection stages, any time inrush conditions
occurs on the line (Ratio of 2nd Harmonics measured > Inrush H2 settings ratio), and will be
at least active during tReset.
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Operating Inrush current is settable from 10% to 35% of fundamental current.

tReset timer defines the minimum duration of overcurrent threshold inhibition (0-2s, settable).
This timer starts as soon as operating inrush current threshold picks up:

− If inrush condition duration is smaller than tReset setting value, selected overcurrent
function will remain inhibited during tReset,

− If inrush condition duration is longer than tReset setting value, selected overcurrent
function will be inhibited as long as inrush condition remains valid.

Under inrush condition, the following selectable protection stages will be blocked:

NOTE: Inrush Blocking in P127 relay is not phase selective. On occurrence of

inrush condition, in any phase, selected protection stages in all 3
phases will be blocked.
P12y/EN AP/E95 Application Guide

Page 64/96 MiCOM P125/P126 & P127

6.4.3 Principle

Second
harmonic Settable
restraint blocking

Blocking logic 1
Blocking logic 2
LEVEL

hold DELAY
LEVEL

LEVEL

Settable blocking IE

LEVEL hold DELAY

Settable blocking I2

LEVEL hold DELAY

Inrush
P0866ENA
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 65/96

6.5 Cold Load Pick-up (P126 & P127)

The Cold Load Pick-up feature enables the selected settings of the MiCOM P126 and P127
relays to be changed to react to temporary overload conditions that may occur during cold
starts. This condition may occur by switching on large heating loads after a sufficient cooling
period, or loads that draw high initial starting currents.
When a feeder is energised, the current levels that flow for a period of time following
energising may differ greatly from the normal load levels. Consequently, overcurrent settings
that have been applied to give short circuit protection may not be suitable during this period.
The Cold Load Pick-up (CLP) logic raises the settings of selected stages for a set duration
tCL. This allows the protection settings to be set closer to the load profile. Cold load pick-up
cannot restart until the end of tCL duration. The CLP logic provides stability, without
compromising protection performance during starting.
The CLP can be started by digital logic Input 52a and/or internal threshold detection by (Not
I< & I>) and/or internal threshold detection by (Not I0< & I0>).
If the CB positions are not available, to detect the Cold Load Pick-up start, a new internal
threshold is created named autostart.
To detect the Cold Load Pick-up, the three phases current should be under 5% of In. When
the current grows up to In or more, with a time of less than 200 ms, an internal edge
detection is created.

CLP does not start

IB
IA IC IB IC
IA
In > In >
Time more One phase is
than 200ms upper than 5% of
In at start.
Internel Virtual
threshold 5% In Internel Virtual
threshold 5% In

T<200ms T<200ms

CLP starts

IA IB IC
In >
- phase A AND phase B AND phase C < 5% In
¨P3942ENa - Phase A > In, in less than 200ms

Internel Virtual
threshold 5% In

P3942ENa
T<200ms
P12y/EN AP/E95 Application Guide

Page 66/96 MiCOM P125/P126 & P127

The following diagram shows the logic start of CLP.

Setting
Cold load Pick-up
52A Actif Selectable
In the menu CLP
Ext. CB 52A
Position
Digital logic Input = 52A &

C.L.P. not in progress

Setting >1 Start C.L.P.

Cold load Pick-up
Auto-detection Actif
Selectable in the menu CLP

A edge detection I under 5%

to I more than In and &
less than 200ms.

C.L.P. not in progress P3941ENa

6.6 VTS
The voltage transformer supervision (VTS) feature is used to detect failure of the analog ac
voltage inputs to the relay. This may be caused by internal voltage transformer faults,
overloading, or faults on the interconnecting wiring to relays. This usually results in one or
more VT fuses blowing.
MiCOM P127 is able to detect a VT loss by using VTS automatism. As soon as VT loss is
detected, all voltage dependent functions will be blocked, an alarm can be raised and
directional overcurrent functions might be replaced by non-directional overcurrent functions.
6.6.1 VTS occurrence
VTS automation uses a fixed logic. A VT fault occurs if at least one of the two following
conditions is verified:

− negative sequence voltage is greather than 0,17*Vn (0,3*Vn for 3Vpn connexion) and
negative sequence current is smaller than 0,5*In.
OR
− voltage is smaller than 0,1*Vn and current greather than 0,1*In.
The VT fault disappears as soon as one criteria is not valid anymore.
6.6.2 VTS alarm
A VTS alarm occurs when a VT fault occurs during more than tVTS.
VTS Alarm won’t occur if VTS conditions remain valid less than the timer tVTS (settable from
0 to 100s). If VTS condition remains longer than tVTS, this alarm will be latched until
HMI/communication reset.
The “VTS alarm” menu activates or deactivates the alarm message and LED (see diagram
§ 6.7).
6.6.3 VTS Blocks 51V
This function blocks the overcurrent controlled by voltage transformer (51V) protection (see
diagram § 6.7, “Automat Ctrl” / “VTS blocks 51V”).
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 67/96

6.6.4 Directional protection modification

If a VT is faulty, the VTS alarm occurs and the directional overcurrent (67/67N) protections
do not operate. Only the non-directional overcurrent (50/51/50N/51N) protections are
available for I>, I>>, I>>>; Ie>, Ie>>, Ie>>> and Ie>>>> thresholds.
The VTS menu gives the possibility to select the protection in case of non directional
overcurrent threshold:

− “VTS Blocks Protections?” submenu will unblock all the non directional overcurrent
protection, or give the possibility to select individually the non directional overcurrent
protection(s),

− When “VTS Blocks protections?” = yes, the non directional overcurrent protections (for
I>, I>>, I>>>; Ie>, Ie>>, Ie>>> and Ie>>>> thresholds) can be individually locked or
unlocked: for instance, if “VTS Non dir I>>” = Yes, when a VT fault occurs, the non
directional overcurrent protection is available for I>> threshold.
6.6.5 Voltage/Power protection
If VTS occurs, all voltage and power protection will be blocked:

− Undervoltage phase (27) protection.

− Overvoltage earth (59N) protection if connection 3Vpn.

− Overpower earth (32N) protection if connection 3Vpn.

− Overpower (32) protection if connection 3Vpn.

6.7 Current Transformer Supervision (CTS)
The current transformer supervision feature is used to detect failure of one or more of the ac
phase current inputs to the relay. Failure of a phase CT or an open circuit of the
interconnecting wiring can result in incorrect operation of any current operated element.
Additionally, interruption in the ac current circuits risks dangerous CT secondary voltages
being generated.
6.7.1 The CT Supervision Feature
The CT supervision feature operates on detection of derived zero sequence current, in the
absence of corresponding derived zero sequence voltage that would normally accompany it.
The voltage transformer connection used must be able to refer zero sequence voltages from
the primary to the secondary side. Thus, this element should only be enabled where the VT
is of five limb construction, or comprises three single phase units, and has the primary star
point earthed.
Operation of the element will produce a time-delayed alarm visible on the LCD and event
record, with an instantaneous block for inhibition of protection elements. Protection elements
operating from derived quantities are always blocked on operation of the CT Supervision
element.
The following table shows the relay menu for the CT Supervision element, including the
available setting ranges and factory defaults:

Setting range
Menu text Default setting step size
Min max
Automat. Ctrl
CT Supervision
CT Supervision ? No Yes / No
Ie> 0.08 × In 0.08 × In 1 × In 0.01 × In
Ue< 5 / 20 V 0.5 / 2V 22 / 88V 0.1 / 0.5V
tCTS 200ms 0s 100s 10ms
P12y/EN AP/E95 Application Guide

Page 68/96 MiCOM P125/P126 & P127

6.7.1.1 Setting the CT Supervision Element

Ie> CTS

& tCTS Alarm

Ue<

Calculation part Logical part

P3975ENa

The residual voltage setting, Ue< and the residual current setting, Ie>, should be set to avoid
unwanted operation during healthy system conditions. For example Ue< should be set to
120% of the maximum steady state residual voltage. The Ie> will typically be set below
minimum load current. The time-delayed alarm, tCTS, is generally set to 5 seconds.
6.8 51V (voltage controlled overcurrent) features (P127 only)
Voltage restrained overcurrent protection is used to clear faults which current is lower than
the rated through current.
Indeed, fault currents lower than the rated value cannot be cleared by phase overcurrent
protection (ANSI codes: 50/51), which, by definition, clears faults which currents are much
higher than the rated current value.
The voltage restrained overcurrent function implemented in the MiCOM P127 is used to
inhibit tripping by the phase overcurrent protection function when the relevant conditions are
met.
To this effect, the 51V function uses negative-sequence overvoltage settable values (V2>
and V2>>), as well as the set threshold values for phase overcurrent (ANSI codes: 50/51)
- I>> and I>>> - and phase undervoltage (ANSI code: 27) - U< and U<< -.
When enabling the 51V function, the user selects whether it should inhibit the 2nd stage
and/or the 3rd stage of the phase overcurrent protection function:

− I>> is inhibited when:

• the voltage measured at the voltage inputs is higher than U<,

• AND the negative sequence voltage is lower than V2>.

− I>>> is inhibited when:

• the voltage measured at the voltage inputs is higher than U<<,

• AND the negative sequence voltage is lower than V2>>.

The result of the 51V function is given by the following equations:

Function Output relay Equation

this signal is transmitted to the this signal is transmitted to the
output relay when 51V function is output relay when 51V function is
not selected selected
51V> I>> output (U< or V2>) and I>>
(1)
t51V> tI>> output (tU< or tV2>) and tI>>
51V>> I>>> (U<< or V2>>) and I>>>
(1)
t51V>> tI>>> (tU<< or tV2>>) and tI>>>
(1)
Since software version 11. These functions are selected with “(U< or V2>) & I>>” and
“(U<< or V2>>) & I>>>” menus.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 69/96

Automat. Ctrl
51V> selection 51V
menu “(U< or V2>)& I>>?” (U< or V2>) & I>>

No
I>>
I>>
Yes
U<
³1 &
V2> &

No
tI>>
tI>>
Yes
tU<
³1 &
tV2> &

Automat. Ctrl
51V>> selection 51V
(U<< or V2>>)&I>>>
menu “(U<< or V2>>)& I>>>?”

No
I>>>
I>>>
Yes

U<<
³1 &
V2>> &

No
tI>>>
tI>>>
Yes
tU<<
³1 &
tV2>> &

Yes
VTS Automat. Ctrl
No VT Supervision
VTS blocks 51V?

No VTS Alarm?

VTS
Yes VTS Alarm

P3963ENa
P12y/EN AP/E95 Application Guide

Page 70/96 MiCOM P125/P126 & P127

6.9 Auxiliary Timers (P125, P126 & P127)

Twelve auxiliary timers tAux1 to to tAuxC (tAux8 to tAuxC are P127 optional auxiliary timers)
are available associated to Aux1to tAuxC logic inputs (refer to AUTOMAT. CRTL/INPUTS
menu). When these inputs are energised, the associated timers start and, after the set time,
the output relays close (refer to AUTOMAT. CRTL/OUTPUTS menu). The time delays are
independently settable.
The tAux1 and tAux2 timers always provide an alarm when their set time is expired; the
tAux3 and tAuxC provide an alarm only when they are assigned to the trip relay in the
Automatic Ctrl Trip Command menu.
NOTE: Auxiliary timers are settable up to 200ms, except tAux 5, tAux6 and
tAux7, settable up to 20000s.
6.10 Selective Scheme Logic (P126 & P127)
The following figure describes the use of non-cascade protection schemes using the start
contacts from downstream relays to block operation of upstream relays.
In the case of Selective Overcurrent Logic (SOL), the start contacts are used to increase the
time delays of upstream relays, instead of blocking them. This provides an alternative
approach to achieving a non-cascade type of overcurrent scheme. It may be more familiar to
some utilities than the blocked overcurrent arrangement.

P0024ENa

TYPICAL SELECTIVE SCHEME LOGIC

The SOL function temporarily increases the time delay settings of the second and third
stages of phase overcurrent. This logic is initiated by energising the appropriate logic input
(Log Sel1 or Log Sel2) as selected in AUTOMAT. CRTL/INPUTS menu.
To allow time for a start contact to initiate a change of setting, the time settings of the second
and third stages should include a nominal delay. Guidelines for minimum time settings are
identical to those given for blocked overcurrent schemes.
The tSel1 and tSel2 timers are independently settable.
See the TD (Technical Data) for the setting values and FT (User Guide) for the selective
scheme logic menu.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 71/96

6.11 Blocking logic function (Blocked directional/non directional overcurrent protection)

The directional non directional overcurrent and overcurrent protection are applicable for
radial feeder circuits where there is small or no back feed.
This application shows that the upstream IDMT relay being blocked by the start output from
a downstream relay that has detected the presence of a fault current, which is above its
threshold settings. Thus both the upstream and downstream relays can then have the same
current and the blocking feature will automatically provide time settings and grading. If the
CB failure protection function is active, the blocking order on the upstream relay will be
removed if the downstream circuit breaker fails to trip.
Thus for a fault downstream from relay C, the start output from relay C will block operation of
relay B, the start output of relay B will block operation of relay A. All the 3 relays could have
the same time and current threshold settings and the grading would be obtained by the
blocking signal received from a relay closer to the fault. This gives a constant, close time
grading, but there will be no back-up protection in the event of the pilots being short
circuited.
However, in practice it is recommended that the upstream relay should be set greater (plus
10%) than the downstream relay setting. This ensures that the downstream relay
successfully blocks the upstream relay when required to do so.

P0024ENa

BLOCKING LOGIC
The allocations of the "Blocking Logic1 and 2” functions are available in the menu
AUTOMAT. CTRL/Blocking Logic1 / Blocking Logic2; this logic is initiated by energizing
the appropriate logic input (Blk Log1 or Blk Log2) selecting in the AUTOMAT.
CRTL/INPUTS menu.
This functionality involves all the current and voltage protections available in the relays.
P12y/EN AP/E95 Application Guide

Page 72/96 MiCOM P125/P126 & P127

6.12 Circuit Breaker State Monitoring

An operator at a remote location requires a reliable indication of the state of the switchgear.
Without an indication that each circuit breaker is either open or closed, the operator has
insufficient information to decide on switching operations. The MiCOM P126 and P127 relays
incorporate a circuit breaker state monitoring function, giving an indication of the position of
the circuit breaker contacts.
This indication is available either on the relay front panel or via the communications network.
The circuit breaker state monitoring function is selectable in the AUTOMAT. CTRL/Inputs
and CONFIGURATION/Led menu.
Further, the MiCOM P126 and P127 relays are able to inform the operator that the CB has
not opened following a remote trip command.
6.13 Circuit Breaker Condition Monitoring (P126 & P127)
Periodic maintenance of circuit breakers is necessary to ensure that the trip circuit and
mechanism operate correctly, and also that the breaking capability has not been
compromised due to previous fault interruptions. Generally, such maintenance is based on a
fixed time interval, or a fixed number of fault current interruptions. These methods of
monitoring circuit breaker condition give a rough guide only and can lead to excessive
maintenance.
The relays record various statistics related to each circuit breaker trip operation, allowing a
more accurate assessment of the circuit breaker condition to be determined. These CB
condition monitoring features are discussed in the following section.
6.14 Circuit Breaker Condition Monitoring Features (P126 & P127)
For each circuit breaker trip operation the relay records statistics as shown in the following
table taken from the relay menu. The RECORDS/CB Monitoring menu cells shown are
counter values only.
These cells can only be read:

MENU TEXT
CB Monitoring
CB Opening Time Displays the CB opening time
CB Closing Time Displays the CB closing time
CB Operations Displays the number of opening commands executed by the CB
Σ Amps(n) I1 Displays the summation of the Amps (or square Amps) interrupted by
the CB phase A
Σ Amps(n) I2 Displays the summation of the Amps (or square Amps) interrupted by
the CB phase B
Σ Amps(n) I3 Displays the summation of the Amps (or square Amps) interrupted by
the CB phase C

The above counters in the CB condition monitoring function may be reset to zero, for
example, following a maintenance inspection and overhaul.
The circuit breaker condition monitoring counters will be updated every time the CB opens,
from all the different way. In cases where the breaker is tripped by an external protection
device it is also possible to update the CB condition monitoring. This is achieved by
allocating one of the logic inputs or via the communications to accept a trigger from an
external device.
The options available for the CB condition monitoring function include the set-up of the
broken conductor protection element and those features, which can be set to raise an alarm,
or to lockout the CB.
All the settings are available in the AUTOMAT. CTRL/CB Supervision menu.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 73/96

6.14.1 Setting Guidelines

6.14.1.1 Setting the Σ In Thresholds

Where overhead lines are prone to frequent faults and are protected by oil circuit breakers
(OCB), oil changes account for a large proportion of the life cycle cost for the switchgear.
Generally, oil changes are performed at a fixed interval of circuit breaker fault operations.
However, this may result in premature maintenance where fault currents tend to be low, and
hence oil degradation is slower than expected.

The Σ In counter monitors the cumulative severity of the duty placed on the interrupter
allowing a more accurate assessment of the circuit breaker condition to be made.
For OCBs, the dielectric withstand of the oil generally decreases as a function of
Σ I2t. This is where ‘I’ is the fault current broken, and ‘t’ is the arcing time within the
interrupter tank (not the breaking time). As the arcing time cannot be determined accurately,
the relay would normally be set to monitor the sum of the broken current squared, by setting
n = 2.
For other types of circuit breaker, especially those operating on higher voltage systems,
practical evidence suggests that the value of n = 2 may be inappropriate. In such
applications n may be set to 1.
An alarm in this instance for example may be indicative of the need for gas/vacuum
interrupter HV pressure testing.
It is imperative that any maintenance programme must be fully compliant with the switchgear
manufacturer’s instructions.
6.14.1.2 Setting the Number of Operations Thresholds
Every operation of a circuit breaker results in some degree of wear for its components. Thus,
routine maintenance, such as oiling of mechanisms, may be based upon the number of
operations. Suitable setting of the maintenance threshold will allow an alarm to be raised,
indicating when preventative maintenance is due.
Should maintenance not be carried out, the relay can be set to lockout the autoreclose
function on reaching an operations threshold. This prevents further re-closing when the
circuit breaker has not been maintained to the standard demanded by the maintenance
instructions supplied by the switchgear manufacturer.
Certain circuit breakers, such as oil circuit breakers (OCB) can only perform a specific
number of fault interruptions before requiring maintenance attention. This is because each
fault interruption causes carbonising of the oil, degrading its dielectric properties.
6.14.1.3 Setting the Operating Time Thresholds
Slow CB operation is also indicative of the need for mechanism maintenance. Therefore, an
alarm is provided and is settable in the range of 100 ms to 5 s. This time is set in relation to
the specified breaking time of the circuit breaker.
6.15 Circuit Breaker Failure (P126 & P127)
Following the inception of a fault one or more main protection devices will operate and issue
a trip output to the circuit breaker(s) associated with the faulted circuit. Operation of the
circuit breaker is essential to isolate the fault, and prevent damage or further damage to the
power system.
For transmission and sub-transmission systems, slow fault clearance can also threaten
system stability. It is therefore common practice to install circuit breaker failure protection
[50BF], which monitors that the circuit breaker has opened within a reasonable time. If the
fault current has not been interrupted following a set time delay from circuit breaker trip
initiation, breaker failure protection (CBF) will operate.
CBF operation can be used to back-trip upstream circuit breakers to ensure that the fault is
isolated correctly. CBF can also operate to reset all start output contacts, by external logic,
ensuring that any blocks asserted on upstream protection are removed.
P12y/EN AP/E95 Application Guide

Page 74/96 MiCOM P125/P126 & P127

6.15.1 Circuit Breaker Failure Protection Mechanism

The CB failure protection included in both MiCOM P126 & P127 relays is performed as
follows.
The tBF timer is initiated when a trip order is issued through the logic output RL1 or by an
assigned digital input (start tBFl).
The trip order can be emitted from a protection element or auxiliary function associated to
the logic output RL1, the logic digital input can be energised from an external device.
In case of command from external device the start of the tBF is active by the change of
status of the relevant digital input (edge), when the tBF is expired a CBF signal is issued.
The tBF is reset when the relevant I< BF is verified for each phase. ((Ia< && Ib< &&
Ic<)==TRUE).
In case of a trip by a RL1 the MiCOM P126 & P127 relays monitor the current signal of each
phase and they compare each phase current signal with the undercurrent I< BF threshold
settable its menu. If the undercurrent I<BF is FALSE ((Ia< && Ib< && Ic<)==FALSE) when
the tBF timer is expired a CBF signal is issued, if it is TRUE (((Ia< && Ib< && Ic<)==TRUE)
the tBF timer is reset. A TRUE condition of the I<BF resets the tBF always.
In the CB fail menu it is also possible to choose if to lock the instantaneous I> and Ie>
thresholds when a CBF signal is emitted. This one allows more flexibility in the fault
localisation and isolation.

CB Fail Enabled

Any Trip
tBF CB Fail Alarm
1 S
Q
External CBF R
Initiate

CBF Ia<

CBF Ib<

CBF Ic<
P0428ENa

6.15.2 Breaker Fail Settings

A typical timer setting used with a 2 ½ cycle circuit breaker is around 150 ms.
The phase undercurrent settings (I<) must be set less than load current, to ensure that I<
operation indicates that the circuit breaker pole is open. A typical setting for overhead line or
cable circuits is 20% In, with 5% In common for generator circuit breaker CBF.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 75/96

6.16 Trip Circuit Supervision (P126 & P127)

The trip circuit extends beyond the relay enclosure and passes through more components,
such as fuses, links, relay contacts, auxiliary switch contacts and so on.
This complexity, coupled with the importance of the trip circuit, has directed attention to its
supervision.
The simplest arrangement for trip circuit supervision contains a healthy trip lamp in series
with a resistance placed in parallel with a trip output relay contacts of the protection device.
However, this solution has limitations as no alarm can be generated. Following paragraphs
describe typical application examples.
6.16.1 MiCOM P126 & P127 Trip Circuit Supervision Mechanism
The Trip Circuit Supervision function included in the MiCOM P126 and P127 relays is
described below:
WARNING 1: SINCE HARDWARE 5 (NAMED ALSO PHASE II), THE VALUES USED IN
THE CALCULATION OF THE EXTERNAL RESISTOR NEEDED FOR THE
TRIP CIRCUIT SUPERVISION HAVE CHANGED.
WARNING 2: THE POLARISATION CURRENT OF THE LOGIC INPUT MUST BE
3.5mA / 19.2VDC DURING 2ms (MINIMUM). THE HOLDING CURRENT
AFTER THESE 2ms SHOULD BE 2.3mA (SEE P12y/EN TD CHAPTER
FOR SPECIFIC POLARISATION RANGES ACCORDING TO NOMINAL
RANGE).
A logic input is programmed to the AUTOMAT. CTRL/CB Supervision/TC Supervision
function. The logic input is associated to the label Trip Circ within the AUTOMAT.
CTRL/Inputs menu. Then, this logic input is wired in the trip circuit according to one of the
typical application diagrams shown in the following example. The method of connecting the
logic input to provide TC supervision, is shown later.
When the function TC Supervision is set "Yes" within CB Supervision sub-menu, the relay
checks continuously on trip circuit continuity whatever the CB status – CB opened or CB
closed. The function TC Supervision is enabled when the trip logic output (RL1) is not
energised. The function TC Supervision is not enabled when the trip logic output (RL1) is
energised.
NOTE: If RL1 is energised, the “Trip Circuit Super” alarm message is
displayed in order to inform that the TC Supervision is not enabled.
A 52 Fail (trip circuit failure) signal is generated if the logic input detects no voltage signal
during a time longer than the settable timer tSUP. See Chapter P12y/EN FT (User Guide)
and Chapter P12y/EN TD (Technical Data) for the settings.
As this function is disabled when the trip logic output (RL1) is energised, this function is
suitable for use with the enabled relay latching logic.

Logic input tSUP 0

Trip Circuit
52 Fail
& signal
Tripping
Output 1(RL1)
energized P0367ENa

TRIP CIRCUIT SUPERVISION PRINCIPLE DIAGRAM

P12y/EN AP/E95 Application Guide

Page 76/96 MiCOM P125/P126 & P127

Three examples of application are given below.

Example 1
In this example only the 52a auxiliary contact is available, the MiCOM P126 & P127 relays
monitor the trip coil whatever the CB status (CB open or CB closed).
However, this configuration is not recommended because the 52a contact and associated
circuit is not monitored.

+
Electrical panel

2 6

-
-
Circuit breaker

52a

P3966ENa

TRIP COIL MONITORING

Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 77/96

Example 2
In this example both 52a and 52b auxiliary contacts are available; the MiCOM P126 and
P127 relays monitor the complete trip circuit when the CB is closed and a part of the trip
circuit when the CB is open.
In this case it is necessary to insert a resistor R1 in series with 52b, if either the output (RL1)
trip is latched or it stays involuntarily closed, or a long time trip pulse is programmed (See §
6.16.2 for R1 calculation). Otherwise, a short circuit of DC trip supply would occur during
tripping sequence.
In this example, the protection is limited: the coil is only monitored when CB is closed.

+
Electrical panel

2 6

-
Circuit breaker

52a

52b

R1

P3967ENa

TRIP COIL AND AUXILIARY CONTACTS MONITORING

P12y/EN AP/E95 Application Guide

Page 78/96 MiCOM P125/P126 & P127

Example 3
In this example both 52a and 52b auxiliary contacts are available, the MiCOM P126 & P127
relays monitor the complete trip circuit whatever the CB status (CB open or CB closed).
In this case it is necessary to insert a R1, if either the output (RL1) trip is latched, or it stays
involuntarily closed, or a long time trip pulse is programmed (See § 6.16.2 for R1
calculation). Otherwise, a short circuit of DC trip supply would occur during tripping
sequence.

+
Electrical panel

2 6

-
R1
Circuit breaker

52a

52b

P3968ENa

TRIP COIL AND AUXILIARY CONTACTS MONITORING

WHATEVER THE POSITION OF THE CB
6.16.2 External Resistor R1 Calculation
The calculation of the R1 resistor value will take into account that a minimum current is
flowing through the logic input. This minimum current value is a function of the relay auxiliary
voltage range (Ua).
Remarks: – The presence of auxiliary relays, such an anti-pumping system
for instance, in the trip circuit must be taken into account for the R1
resistance values specification.
– It is assumed the maximum variations of the auxiliary voltage
value are ±20%.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 79/96

1 - Case of example no 2:
The R1 resistor maximum value (in Ohm) is defined by the following formula:

0,8 × U a − U min
R1 < [Ohm]
I min

Where:
Ua = Auxiliary voltage value (in this case a DC voltage; range is given on label under the
top hinged cover. See table below).
Umin = Internal minimum voltage value needed for the opto logic input to operate.
Imin = Minimum current value needed for the opto logic input to operate.

Relay auxiliary voltage range (Ua)

24-60 VDC (ordering code P12xx00Axxxxx) 48-250 VDC/AC (ordering code P12xx00Fxxxxx)
R1 < (0,8 x Ua – 19,2)/0.035 R1 < (0,8 x Ua – 19,2)/0.035

The R1 resistor withstand value (in Watt) is defined below:

PR1 > 2 ×
(1,2 × U a ) 2 [W]
R1
2 - Case of example no 3:
The R1 resistor maximum value (in Ohm) is defined by the following formula:

0,8 × U a − U min
R1 < − R Coil [Ohm ]
I min
Where:
Ua = Auxiliary voltage value (in this case a DC voltage; range is given on label under
the top hinged cover. See table below).
Umin = Internal minimum voltage value needed for the opto logic input to operate.
Imin = Minimum current value needed for the opto logic input to operate.
Rcoil = Trip coil resistance value.

Relay auxiliary voltage range (Ua)

24-60 VDC (ordering code P12xx00Axxxxx) 48-250 VDC/AC (ordering code P12xx00Fxxxxx)
R1 < (0,8 x Ua – 19,2)/0.035 - Rcoil R1 < (0,8 x Ua – 19,2)/0.035 - Rcoil

The R1 resistor withstand value (in Watt) is defined below:

PR1 > 2 ×
(1,2 × U a ) 2 [W]
(R1 + R Coil )
If the trip contact is latched or temporarily by-passed, the continuous current through the
tripping coil is:
(R1 + RCOIL)
ICONTINUOUS =
1.2 × va

If the value is above admissible continuous current through the tripping coil, trip contact
latching must not be made and by-passing trip contact should never be made.
P12y/EN AP/E95 Application Guide

Page 80/96 MiCOM P125/P126 & P127

6.17 Switch onto Fault Protection & Trip on Reclose (SOTF/TOR) (P126 & P127)
6.17.1 General
Under particular conditions, it can happen that when the feeder is supplied by the closing of
the CB a fast trip command may be required if a fault is present (Closing on to fault).
Some faults may be caused by conditions not removed from the feeder after a reclosing
cycle or a manual trip, or due to earthed clamps left on after maintenance works. In these
cases, it may be desirable to clear the fault condition in fast time, rather than waiting for the
trip time delay DMT or IDMT associated with the involved protection.
In case of manually closing of the CB it can happen to switch on to an existing fault. This is a
particularly critical situation, because the overcurrent protection would not clear the fault until
the set operate delay had elapsed. This is another typical case of closing on to fault. Hence it
is desirable to clear the fault as fast as possible.
The P126 and P127 relays provide the SOTF/TOR functionality.
The SOTF acronym means switch on to fault.
The TOR acronym means trip on recloser.
The available setting to enable/disable/set the SOTF/TOR (Switch On To Fault/ Trip On
Reclose) function is written in a submenu of the AUTOMATIC CTRL menu.
The setting regarding the I>> and I>>> is provided to initiate the SOTF function.
6.17.2 SOTF/TOR description
When the SOTF/TOR function is enable, it can be initiated by a local manual CB control
close command detected by the digital input labelled Man.Close, or by a TC (closing
command by remote via network: Modbus, IEC 60870) or by an automatic reclosing cycle.
When CB has been closed on some faults caused by lightning or something else, the fault
detection needs a time period. This is the reason why a 500ms fixed time window after
initiatialization of the SOTF/TOR function is included.
When this fixed timer is elapsed and the I>> or I>>> is detected, the settable timer t Sotf
starts.
The existence of this settable timer is justified because in some applications selectivity for
fault occurring in stage two or three is requested.
Another justification of the SOTF/TOR tripping time delay is for cases where serious
transient happen and the three poles of the CB do not close at the same time and for those
cases where the CB may not be closed instantaneously.
Furthermore, the t SOFT can also be considered a trip delay time that substitutes the trip
timer of the started threshold such to accelerate the tripping.
If a trip due to switch on to fault occurs during the reclaim time of the ARC, the trip will be
definitive and the ARC will move in the blocked status.
If the I>> and I>>> reset during the settable timer t Sotf the SOTF/TOR function resets.
The following signals can activate the SOTF/TOR function:
- “Ctrl close” logical input,
- manual closing ordered by HMI,
- command generated by a digital input labelled “SOTF”,
- front communication order,
- rear communication order,
- when existing, second rear communication order,
- close ordered by autorecloser,
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 81/96

The SOTF/TOR functionality diagram is shown below.

I>>
0 &
Autorecloser Autorecloser
0

AR selected 0 I>>>

0 &
Rear Com order t SOTF
&
0

0 0.. 500 ms
Rear Com selected
valided by
setting
0 &
Front Com order
0

0
Front Com selected Monostable
OR 500 ms

Ctrl Close input 0 &

0

0
OR Trip
Ctrl Close slected

SOTF (Manual 0 &

close) input tI> valided by
d 0
setting
SOTF (Manual close) 0
input selected

tI>> valided by
0 & setting
HMI order
0

0
HMI order selected tI>>> valided by
setting

Close origin : Signalling of the circuit breaker closing request

SOTF setting : Setting : Choice of the SOTF feature activation

SOTF setting : Threshold type selected in SOTF setting

P3939ENa
Trip setting : Threshold type selected in Trip setting

The trip by SOTF is settable in the AUTOMATIC CTRL/TRIP COMMAND submenu and in
the AUTOMATIC CTRL/Output relays submenu.

6.18 Local/Remote conditioning (P125, P126 & P127)

6.18.1 General
The goal of this feature is to be able to block commands sent remotely through
communication networks (like setting parameters, control command, etc.), to prevent any
accidents or maloperation during maintenance work performed on site.
A digital input labelled “LOCAL MODE” is assigned to this feature. In Local mode, only the
synchronising time signal is allowed.
Commands sent remotely (CTRL TRIP and CTRL CLOSE) as well as commands sent by the
autoreclose function (CB Close) can be set to activate their own dedicated output relay (and
not necessarily the same output relay as the protection trip output RL1).

6.18.2 Settings
In the “AUTOMATIC CTRL/Trip Commands ” menu, TC item uses the “CTRL TRIP” function
to open the CB.
In the “AUTOMATIC CTRL/Output relays” menu, the “CTRL TRIP” and “CTRL CLOSE”
functions are assigned to remotely open and close the CB.
The CB CLOSE relay can be used for the close command.
In order to keep the normal functionality, the customer will have to assign both information
TRIP by protection and Ctrl Trip on (RL1), and to assign both information CLOSE CTRL and
CB CLOSE on the same auxiliary relay.
An application of the subject mentioned above is presented below.
In the following schematic, the customer will have to assign the TRIP and CTRL TRIP to the
TRIP RELAY, the CB CLOSE and the CTRL CLOSE to the auxiliary relay number two, in
accordance with setting above.
P12y/EN AP/E95 Application Guide

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If the Local input is energised any remote command will be ignored if the Local input is de-
energised all the remote control will be considered.

DC V+ Local Switch

P125/P126/P127 Remote
Local trip

RL 1
Control trip
Local close

RL 2
Control close

RL 2
AR close

RL 1
Protection trip

Input labeled
Local

DC V- P0689ENa

6.19 Logic equations (P126 & P127)

The MiCOM P126 and P127 relays integrate complete logic equations to allow customization
of the product based on customer application.
Up to 8 independent Boolean equations can be used. Each equation offers the possibility to
use AND, OR, AND NOT, OR NOT & NOT logical gates. Up to 16 parameters can be used
for each equation. Every result of equation can be time delayed and assigned to any output
relays, trip, trip latching and/or HMI LEDs.
Every equation has a rising temporisation from 0 s to 600 s with a step of 0.01 s.
Every equation has a falling temporisation from 0 s to 600 s with a step of 0.01 s.
Every equation temporised result is assignable to trip, trip latching, outputs and LEDs.
An example logic implementation using Equation A is shown below:

I<
tAUX 1(input1) &
5 sec
1 Output
10 sec
tAUX 2(input2)
P0717ENa
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 83/96

7. RECORDS (P125, P126 & P127)

7.1 Event Records
The relay records and time tags up to 250 events and stores them in a non-volatile memory.
This enables the system operator to analyse the sequence of events that occurred within the
relay following a particular power system condition, switching sequence etc. When the
available memory space is exhausted, the new fault automatically overwrites the oldest fault.
The real time clock within the relay provides the time tag to each event, to a resolution of
1ms.
The event records are available for viewing either on the front panel, or via the front panel
EIA RS232 port or remotely, via the rear EIA RS485 port.
7.2 Fault Records
Each time any of the programmed thresholds are crossed a fault record is created and
stored in a memory. The fault record tags up to 25 faults and stores them in a non-volatile
memory. This enables the system operator to identify and analyse network failures. When
the available memory space is exhausted, the new fault automatically overwrites the oldest
fault.
Note that viewing of the actual fault record is carried out in the RECORD/Fault Record
menu, which is selectable from up to 25 stored records. These records consist of fault flags,
fault measurements etc. Also note that the time stamp given in the fault record itself will be
more accurate than the corresponding stamp given in the event record as the event is
logged some time after the actual fault record is generated.
The fault records are available for viewing either on the display, or via the front panel EIA
RS232 port or remotely, via the rear EIA RS485 port.
7.3 Instantaneous Recorder
Each time any of programmed threshold is crossed an instantaneous record is created and
displayed in the RECORDS/Instantaneous menu. The last five starting information with the
duration of the information are available. The number of the fault, hour, date, origin (voltage,
current and wattmetric protection thresholds), length (duration of the instantaneous), trip (a
trip is appeared, yes or no) are displayed in the RECORDS/Fault Record menu.
7.4 Disturbance Records
The integral disturbance recorder has an area of memory specifically set aside for
disturbance record storage. The disturbance records that may be stored are 3, 5, 7 or 9
seconds length each. Disturbance records continue to be recorded until the available
memory space is exhausted, at which time the oldest disturbance record(s) is (are)
overwritten to make space for the newest disturbance record(s).
The recorder stores actual samples, which are taken at a rate of 16 samples per cycle.
Each disturbance record consists of analogue data channels and digital data channels. Note
that the relevant VTs and CTs ratios for the analogue channels are also extracted to enable
scaling to primary quantities.
The total disturbance recording time is 5 records of 3 seconds, or 4 × 3s, or 3 × 5s, or 2 × 7s
or 1 × 9s. The disturbance record starts with the disturbance. If the pre-time time is set to
100ms, the record starts 100 ms before the disturbance.
For the settings of the parameters see FT (User Guide) and TD (Technical Data) chapters of
this TG.
P12y/EN AP/E95 Application Guide

Page 84/96 MiCOM P125/P126 & P127

8. ROLLING AND PEAK VALUE DEMANDS (P126 & P127)

The MiCOM P126 and P127 relays are able to store the 3 phases rolling average and
maximum subperiod values. The description and principle of calculation are given bellow.
8.1 Rolling demand
The principle of the calculation of the rolling demand value for IA, IB and IC currents is
following:

− Calculation of the average of the RMS values on a "Rolling Sub Period" period.
The setting of the width of the period "Rolling Sub Period" is in the "RECORDS/Rolling
Demand/Sub Period" menu.
Setting range: from 1 to 60 minutes.

− Storage of these values in a sliding window

− Calculation of the average of these average values (sliding window values) on the
number of "Num. of Sub Periods" periods
The setting of the number of Sub Period "Num of Sub Periods" in the "RECORDS/Rolling
Demand/Num of Sub Per" menu.
Setting range: from 1 to 24.
Display of the first result in the MEASUREMENTS menu only after the storage of "Num of
Sub Periods" periods.
The 3 phases Rolling average value are displayed:

− Rolling Average IA RMS

− Rolling Average IB RMS

− Rolling Average IC RMS

The calculation is reset by either "hand Reset" (by key _ ) without use of password, or a
remote command.
NOTE: In case of loss of power supply the rolling demand are not stored.
A modification of the settings (either "Rolling Sub Period" or "Num of Sub Periods"
parameter) reset the calculation.
Example:
Sub Period = 5 mn
Num of Sub Period = 2

At the end of the Sub Period 2:

Rolling average value = (average value 1 + average value 2)/2
At the end of the Sub Period 3:
New Rolling average value = (average value 2 + average value 3)/2
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 85/96

8.2 Peak value demand

The principle of the calculation of the Peak value demand for IA, IB and IC currents is
following:
Every "Rolling Sub Period", a new average value is compared with the previous value
calculated at the previous "Rolling Sub Period". If this new value is greater than the
previous value already stored, then this new value is stored instead of the previous one.
In the opposite if this new value is lower than the previous value already stored, then the
previous value is kept stored.
In this way, a average peak vale will be refreshed each Sub Period; There is no dedicated
setting for this calculation. The setting of the Sub Period in the RECORDS menu is used.
The 3 phase Peak value demand are displayed in the MEASUREMENTS menu:

− MAX SUBPERIOD IA RMS

− MAX SUBPERIOD IB RMS

− MAX SUBPERIOD IC RMS

The calculation is reset by either "hand Reset" (by key _ ) without use of password, or a
remote command.
NOTE: In case of loss of power supply the Peak average values are stored.
A modification of the setting "Rolling Sub Period" parameter reset the calculation.
P12y/EN AP/E95 Application Guide

Page 86/96 MiCOM P125/P126 & P127

9. SETTING GROUP SELECTION (P125, P126 & P127)

The MiCOM P125, P126 relays have two protection related setting groups named
PROTECTION G1 and PROTECTION G2. Only one of two setting groups is active. The
MiCOM P127 relay have eight protection groups (PROTECTION G1 to PROTECTION G8).
Changes between the groups are executed via the front interface (CONFIGURATION /
GROUP SELECT / SETTING GROUP), a dedicated logic input (AUTOMAT CTRL / INPUT
X / CHANGESET) where X is the chosen logic input, or through the communication port
(refer to Mapping Data Base for more detailed information).
To avoid any undesirable tripping, the setting group change is only executed when none
protection function is running excepted than for thermal overload function.
If a setting group change is received during any protection or automation function, it is stored
and executed after the last timer has elapsed.
The active group is displayed in the OP PARAMETER menu.
The active group can also be assigned to an output relay: with a normally open contact.

− a contact open will indicate Group 1

− a contact closed will indicate Group 2

9.1.1 Setting group change by digital input
It is possible to configure the change of the setting group by a digital input, either on low
level or on high level. The choice can be done in the CONFIGURATION/Inputs menu.
Low level (idem for high level) depending of the application is selectable in the
CONFIGURATION/Group Select/Change Group/Input menu.
If the digital input assigned to the change of setting group operates on level (low or high), it is
not possible to change of setting group via either remote communication or front panel.
Switching between the groups can be done via:

• the relay front panel interface (CONFIGURATION / GROUP SELECT / SETTING

GROUP),

• a dedicated logic input (AUTOMAT. CTRL/INPUT X / CHANGE SET) where X is

the chosen logic input,

• through the communications port.

9.1.2 Priority
The front panel is priority level maximum due the fact when the user takes the hand on front
panel and enters a password , it is not possible to change of setting group via remote
communication as long as the password is active (5mn).
Below are listed the priorities in the different ways to switch between setting groups.

ORIGIN OF THE ORDER PRIORITY LEVEL

FRONT PANEL MAXIMUM
LOGIC INPUT MEDIUM
REMOTE COMMUNICATIONS MINIMUM
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 87/96

10. MEASUREMENTS
The measurement functions on MiCOM P125, P126 and P127 relays are described in
chapter User Guide of this Technical Guide.
Particular attention is to be given to the power and energy measurement.
10.1 Power and Energy Measurements (P127)
The MiCOM P127 relay provides the measurements function for active and reactive power
and for active and reactive energy.
The fundamental value is provided for the derived (calculated) measures.
The following table lists the shown voltage measurements, according to the VT connection
(‘CONFIGURATION / General options / VT Connection)

Configuration Displayed Configuration Displayed Configuration Displayed

3Vpn on HMI 2Vpn+Vr on HMI 2Vpp + Vr on HMI
Direct Direct
Ua Yes Yes N.A -------------
measurement measurement
Direct Direct
Ub Yes Yes N.A -------------
measurement measurement
Direct Derived
Uc Yes Yes N.A -------------
measurement measurement
Derived Derived Direct
Uab Yes Yes Yes
measurement measurement measurement
Derived Derived Direct
Ubc Yes Yes Yes
measurement measurement measurement
Derived Derived Derived
Uac Yes Yes Yes
measurement measurement measurement
Derived Direct Direct
UN Yes Yes Yes
measurement measurement measurement

The value for power is calculated in accordance with the following listed table.

VTs connection Active Reactive power calculation method

Sum of each power phase P= PA+PB+PC
3Vpn
Q= QA+QB+QC
Sum of each power phase P= PA+PB+PC
2Vpn+Vr
Q= QA+QB+QC
2Vpp+Vr Aron insertion

The value for energy is calculated by multiplying the calculated power value by time.
The calculated energy value is stored in a non-volatile memory (E²PROM) every second, so
that in case of temporary power supply fault, the previous values calculated can be recalled.
The MiCOM P127 relay provides, on the display, the measurements of the power and of the
energy. Both refer to primary values and rely on the CT and VT ratio.
The maximum active and reactive power value displayed is 9999MW and 9999MVAr.
The maximum active and reactive energy value displayed is 4200GWh and 4200GVArh.
The sign of the active and reactive power/energy values is taken according to the diagram
below.
P12y/EN AP/E95 Application Guide

Page 88/96 MiCOM P125/P126 & P127

They are in accordance with the wiring diagrams in the chapter P12y/EN CO in this
Technical Guide.

+
cos phi cos phi
+P V +P
-Q +Q
I

-cos phi -cos phi

-P -P
-Q +Q

P0100ENa

10.2 Additional measurement CT (P127 optional configuration only)

In addition to existing protection CT (Ia, Ib, Ic, I0) and (Va, Vb, Vc), two measurements CT
are added (optional configuration).
The “Metering” menu is a dedicated menu. Phases currents and voltages are displayed
according to CTM1 and CTM2 phases configuration:

‘CONFIGURATION / General options’

“CTM1 phase ?” “CTM2 phase ?” “METERING” menu
= none = none The menu is not displayed.
= IA (or IB, or IC) = none This option indicates that CTm1 is physically
connected to phase A, and CTM2 not
connected. The menu displays the phase A
currents.
= IA (or IB, or IC) = IB (or IC, or IA) This option indicates that CTm1 is physically
connected to phase A, and CTm2 is
connected to phase B. The menu displays the
phase A and phase B measured values.
The third phase is computed using the
vectorial equation:
“ IA + IB + IC =0.

When CTm1 and CTm2 phases are connected, “Metering” menu displays frequency, 3-
phases currents, 3-phases voltage, power and energy measured values.
NOTE: the following explanations are given for phase A. The same equations
are applicable to phase B or phase C using (IBm or ICm) and (VBm or
VCm).
10.2.1 Frequency
This menu displays network frequency.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 89/96

10.2.2 Currents
The “Currents” menu displays the magnitude of the measured currents (true RMS value). It
takes into account the CTm connection (see the previous table) and CTm ratio
(‘CONFIGURATION / Transfo ratio’).
MiCOM P127 displays the magnitude of fundamental current, and the magnitude of the
currents up to the 10th harmonics.
10.2.2.1 Total Harmonic Distortion (THD) and Total Demand Distorsion (TDD)
Current Harmonic Distortion is measured by phase in several different ways. The first
method is Total Harmonic Distortion (THD). The MiCOM P127 THD (THD IAm) equation is
given in the following equation (for phase A):

10

∑ IAmh²
h=2
THD IAm = 100% ×
I1
Note: the denominator I1 is the magnitude of the fundamental current.
Alternatively, Current Harmonic Distortion can be measured as Total Demand Distortion
(TDD). Demand Distortion differs from traditional harmonic distortion in that the denominator
of the distortion equation is a fixed value “IL”. This fixed denominator value is defined as the
average peak demand, and is set using ‘CONFIGURATION / General options /
IAm TDD denom.’ cell:

10

∑ IAmh²
h=2
TDD IAm = 100% ×
IL
By creating a measurement that is based on a fixed value, TDD is a "better" measure of
distortion problems. Traditional THD is determined on the ratio of harmonics to the
fundamental. While this is acceptable for voltage measurements, where the fundamental
only varies slightly, it is ineffective for current measurements since the fundamental varies
over a wide range. Using traditional THD, 30% THD may mean a 1 Amp load with 30%
Distortion, or a 100 Amp load with 30% Distortion. By using TDD, these same two loads
would exhibit 0.3%.
10.2.2.2 K Factor
K-Factor is a measure of the heating effects on transformers. The following equation is used,
for MiCOM P127, to determine phase A K-Factor, where "h" is the harmonic number and
"IAmh" is the magnitude of the hth harmonic:
10

∑ IAmh² × h²
h =1
K IAm = 100 × 10

∑ IAmh²
h =1

K-Factor is measured on each of the three phases of amps, however there is no "Total" K-
Factor. K-Factor, like THD, does not indicate the actual load on a device, since all three of
these measurements are ratios. Given the same harmonic ratio, the calculated K-Factor for a
lightly loaded transformer will be the same as the calculated K-Factor for a heavily loaded
transformer, although the actual heating on the transformer will be significantly different.
P12y/EN AP/E95 Application Guide

Page 90/96 MiCOM P125/P126 & P127

10.2.3 Voltages
The following table lists the displayed voltage measurements, according to the VT
connection (‘CONFIGURATION / General options / VT Connection) and / or to the VT
protection (‘CONFIGURATION / General options / VT Protection).

Configuration Configuration Configuration

“3Vpn” Displayed “2Vpn+Vr” Displayed “2Vpp + Vr” Displayed
AND on HMI AND on HMI OR on HMI
“Protect P-N” “Protect P-N” “Protect PP”
Direct Direct
Va Yes Yes N.A -------------
measurement measurement
Direct Direct
Vb Yes Yes N.A -------------
measurement measurement
Derived
Direct
Vc Yes (calculated) Yes N.A -------------
measurement
measurement
Direct
Uab N.A ------------- N.A ------------- Yes
measurement
Direct
Ubc N.A ------------- N.A ------------- Yes
measurement
Derived
Uca N.A ------------- N.A ------------- Yes
measurement

The “Voltages” menu displays the magnitude of the measured voltages (true RMS value). It
takes in account the CTm connection (see the previous table) and CTm ratio
(‘CONFIGURATION / Transfo ratio’).
MiCOM P127 displays the magnitude of fundamental voltage, and the magnitude of the
voltages up to the 10th harmonics.
10.2.3.1 Total Harmonic Distortion (THD)
Voltage Harmonic Distortion is measured by phase in several different ways. The MiCOM
P127 equation for phase A Total Harmonic Distortion (THD) is given in the following
equation:

10

∑ VAmh²
h=2
THD VAm = 100% ×
V1
Note the denominator V1 is the fundamental magnitude. For Individual Harmonic Distortion
there is no summation, only one component is used in the numerator.
10.2.4 Powers
The MiCOM P127 displays:

− the measured positive & negative active power; see § 4.3,

− the measured positive & negative reactive power; see § 4.3,

− the measured total apparent power (product of the per-element Volts and Amps),
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 91/96

− the three phase displacement power factor (cosine of the angle between the
fundamental voltage vector and the fundamental current vector): The Total
Displacement Power Factor measurement is calculated using the "Power Triangle,” or
the three-phase Fundamental WATTS divided by the three-phase Fundamental VAs.
The per-phase Fundamental VA measurement is calculated from the product of the
per-phase Fundamental Amp and Fundamental Volts values. The three-phase
Fundamental VA measurement is the sum of the per-phase Fundamental VA values
(Arithmetic VAs).
See § 10.2.6 to see the convention for the positive (+) or negative (–) sign.
10.2.5 Energies
Separate values are maintained for both positive and negative Watt-hours (export and import
powers) and positive and negative VAR-hours (Lagging and leading VARs. These energy
quantities are calculated every minute from the Total Watts and Total VARs.
See § 10.2.6 to see the convention for the positive (+) or negative (–) sign.
10.2.6 Plus and minus signes for power and energy calculation.
Plus or minus signs are defined as follows:

Reference direction

SOURCE LOAD

Metering point

ACTIVE POWER: P is positive when the power is from the source to the load
REACTIVE POWER: Q is positive when the load is inductive.

Im (+)

Quadrant 2 Quadrant 1

V
Re (–) Re (+)

Quadrant 3 Quadrant 4

Im (–)
P3976ENa
P12y/EN AP/E95 Application Guide

Page 92/96 MiCOM P125/P126 & P127

with:

Quadrant 1 Quadrant 2 Quadrant 3 Quadrant 4

Power
Active (P) + – – +
Reactive (Q) – – + +
Energy
Export Wh (Ea+) + – – +
Import Wh(Ea–) – + + –
Lagging VARh (Er+) – – + +
Leading VARh (Er–) + + – –
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 93/96

11. LOGIC INPUTS AND LOGIC OUTPUTS

11.1 Logic Inputs
In the logic input submenu can be set the digital inputs as active high or active low, can be
chosen the supply type DC or AC and it is possible to set the start/stop of the relevant
auxiliary timers assigned to the inputs by front or edge.
By the ordering code it is possible to select the relay with the digital inputs with EA approval
regulation.
See the technical data for further information.
The setting menu for this functionality is in the CONFIGURATION menu. For more details
see FT (User Guide).
In modern protective schemes it is often desirable to synchronize the relay’s real time clock
so that events from different relays can be placed in chronological order.
This can be done using the communication interface connected to the substation control
system or via an opto-input.
Any of the available opto-inputs on the P12x relay can be selected for synchronization.
Pulsing this input will result in the real time clock snapping to the nearest minute. The
recommended pulse duration is 20ms to be repeated no more than once per minute. An
example of the time synchronization function is shown.

Time of “Sync. Pulse” Corrected Time

19:47:00.000 to 19:47:29.999 19:47:00.000
19:47:30.000 to 19:47:59.999 19:48:00.000

NOTE: The above assumes a time format of hh:mm:ss

A single digital input can be used for several internal functions or assigned directly to any
output contact.
11.2 Logic Outputs
A dedicated output relay is assigned to each logic output. It is possible to set the relays as
self reset or latching.
The two first output contacts (RL1 & RL2) can be used as failsafe relays to provide a “fail
safe alarm” in case of power supply loss or major hardware failure. Other available relays
can be inverted to reverse NO relays operating condition (output relays closing when logical
state of the signal changes from 1 to 0).

FAIL 87654321
SAFE RE. 00100010
This settings means:

− RL1: Normally Open (NO)

− RL2: Fail Safe relay

− RL3, 4, 5, 7 & 8: NO

− RL6: Inverted (NO but output relays closed when logical state of the signal is going
down)
The setting menu for the functionality of the logic outputs is available in the AUTOMAT.
CTRL menu.
It is possible to assign a specific function to each output relay except RL1.
For more details see the chapter User Guide.
P12y/EN AP/E95 Application Guide

Page 94/96 MiCOM P125/P126 & P127

12. MAINTENANCE MODE

This menu allows the user to verify the operation of the protection functions without sending
any external order (Tripping or signalling).
The selection of the maintenance mode is possible by logic input, control command (rear or
front port), or by front display. The end of maintenance mode is done by logic input, by
control command or on the front display time out ( 5minutes) and by turning off the power
supply.

Maintenance Mode
YES

When activating this menu (YES), the Alarm led will start flashing and an alarm message will
appear “MAINTENANCE MODE”. In this case, all output contacts are blocked, no operation
will take place on these contacts even if a protection threshold associated to one of these
output contacts is exceeded.
(If protection threshold is exceeded, all the associated leds will become ON, even the TRIP
LED, if the threshold is associated to the RL1).

RELAYS 8765W4321
CMD 000000000
This window allows the user to verify the external wiring to the relay output contacts, to do
this, it is sufficient to assign a 1 to any of the output contacts, this will close the contact and
the wiring continuity could be verified.
Application Guide P12y/EN AP/E95

MiCOM P125/P126 & P127 Page 95/96

13. CT REQUIREMENTS
The CT requirements for the MiCOM P12y relays are given below.
The current transformer requirements are based on a maximum prospective fault current of
50 times the relay rated current (In) and the relay having an instantaneous setting of 25
times rated current (In). The current transformer requirements are designed to provide
operation of all protection elements.
Where the criteria for a specific application are in excess of those detailed above, or the
actual lead resistance exceeds the limiting value quoted, the CT requirements may need to
be increased according to the formulae in the following sections.

Nominal Rating Nominal Accuracy Accuracy Limit Limiting lead

Output Class Factor resistance
1A 2.5VA 10P 20 1.3 ohms
5A 7.5VA 10P 20 0.11 ohms

13.1 Definite time / IDMT overcurrent & earth fault protection

Time-delayed Phase overcurrent elements:

VK ≥ Icp/2 * (RCT + RL + Rrp)

Time-delayed Earth Fault overcurrent elements:

VK ≥ Icn/2 * (RCT + 2RL + Rrp + Rrn)

13.2 Instantaneous overcurrent & earth fault protection
CT requirements for instantaneous phase overcurrent elements:

VK ≥ Isp * (RCT + RL + Rrp)

CT requirements for instantaneous earth fault overcurrent elements:

VK ≥ Isn * (RCT + 2RL + Rrp + Rrn)

13.3 Definite time / IDMT sensitive earth fault (SEF) protection
Time delay SEF protection:

VK ≥ Icn/2 * (RCT + 2RL + Rrp + Rrn)

SEF Protection - as fed from a core-balance CT:
Core balance current transformers of metering class accuracy are required and should have
a limiting secondary voltage satisfying the formulae given below:
Time Delayed element:

VK ≥ Icn/2 * (RCT + 2RL + Rrp + Rrn)

Instantaneous element:

VK ≥ Ifn/2 * (RCT + 2RL + Rrp + Rrn)

Note that, in addition, it should be ensured that the phase error of the applied core balance
current transformer is less than 90 minutes at 10% of rated current and less than 150
minutes at 1% of rated current.
P12y/EN AP/E95 Application Guide

Page 96/96 MiCOM P125/P126 & P127

Abbreviations used in the previous formulae are explained below:

Where:
VK = Required CT knee-point voltage (volts),
Ifn = Maximum prospective secondary earth fault current (amps),
Ifp = Maximum prospective secondary phase fault current (amps),
Icn = Maximum prospective secondary earth fault current or 31 times I>
setting (whichever is lower) (amps),
Icp = Maximum prospective secondary phase fault current or 31 times I>
setting (whichever is lower) (amps),
Isn = Stage 2 & 3 Earth Fault setting (amps),
Isp = Stage 2 and 3 setting (amps),
RCT = Resistance of current transformer secondary winding (ohms)
RL = Resistance of a single lead from relay to current transformer (ohms),
Rrp = Impedance of relay phase current input at 30In (ohms),
Rrn = Impedance of the relay neutral current input at 30In (ohms).
Communications P12y/EN CT/E95

MiCOM P125/P126 & P127

MODBUS &
IEC 60870-5-103 &
DNP 3.0
DATABASE
MiCOM P125-P126 – V12
MiCOM P127 – V13
Communications P12y/EN CT/ E95

MiCOM P125/P126 & P127 Page 2

BLANK PAGE
Communications P12y/EN CT/ E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 1/148

MODBUS DATABASE
MiCOM P125-P126 – V12
P127 – V13
P12y/EN CT/ E95 Communications
MODBUS DATABASE
Page 2/148 MiCOM P125/P126 & P127

BLANK PAGE
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 3/148

CONTENT

1. INTRODUCTION 5
1.1 Purpose of this document 5
1.2 Glossary 5

2. MODBUS PROTOCOL 6
2.1 MODBUS connection technical characteristics 6
2.1.1 MODBUS connection parameters 6
2.1.2 Exchanges messages synchronisation 6
2.1.3 Message validity check 6
2.1.4 Address 6
2.2 MODBUS functions available in the protection device 7
2.3 Description of the ModBus protocol 7
2.3.1 Frame size received from the protection device (slave) 7
2.3.2 Format of frames sent from the relay 8
2.3.3 Messages validity check 8

3. DATABASE ORGANISATION 10
3.1 Product information, remote signalling, measurements 11
3.1.1 Page 0H - Product information, remote signalling, measurements (part 1) 11
3.1.2 Page 23H – Measurements / P127 with CT of measurement (part 2) 16
3.2 General remote parameters 19
3.2.1 Page 1H - General remote parameters (part 1) 19
3.2.2 Page 6H - General remote parameters (part 2) 25
3.3 Protection groups parameters 31
3.3.1 Page 2H - Setting group 1 remote parameters 31
3.3.2 Page 3H - Setting group 2 remote parameters 39
3.3.3 Page 24H - Setting group 1 remote parameters 39
3.3.4 Page 26H - Setting group 2 remote parameters 39
3.3.5 Page 28H - Setting group 3 remote parameters 39
3.3.6 Page 2AH - Setting group 4 remote parameters 39
3.3.7 Page 2CH - Setting group 5 remote parameters 39
3.3.8 Page 2EH - Setting group 6 remote parameters 39
3.3.9 Page 30H - Setting group 7 remote parameters 39
3.3.10 Page 32H - Setting group 8 remote parameters 39
3.4 Boolean equations 40
3.4.1 Page 5H - Boolean equations parameters 40
3.5 Remote controls, device status & time synchronisation 47
3.5.1 Page 4H - Remote controls 47
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 4/148 MiCOM P125/P126 & P127

3.5.2 Page 7H - Device status 47

3.5.3 Page 8H - Time synchronisation 47
3.6 Disturbance records 48
3.6.1 Pages 9H to 21H - Disturbance record data 48
3.6.2 Page 22H - Disturbance record index frame 52
3.6.3 Pages 38H to 3CH - Disturbance record & channel selection 53
3.6.4 Page 3DH - Number of disturbance records available 55
3.7 Events records 57
3.7.1 Page 35H - Event record data 57
3.7.2 Page 36H - Oldest event data 64
3.8 Fault records 64
3.8.1 Page 37H - Fault record 64
3.8.2 Page 3EH - Oldest fault record 67
3.9 Error counters 68
3.9.1 Page 5AH - Error counters 68

4. MAPPING FORMAT DESCRIPTION 69

4.1 Disturbance record additional information 101
4.1.1 MODBUS request definition used for disturbance record 101
4.1.2 Request to know the number of disturbance records 101
4.1.3 Service requests 101
4.1.4 Disturbance record upload request 101
4.1.5 Index frame upload request 101
4.1.6 Request to retrieve the oldest non-acknowledge event 102
4.1.7 Request to retrieve a dedicated event 102
4.1.8 Modbus request definition used to retrieve the fault records 102
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 5/148

1. INTRODUCTION
1.1 Purpose of this document
This document describes the characteristics of the different communication protocols of
MiCOM P127, P126 and P125 relays (named P12y in this document).
The available communication protocols on the relay are listed below:

− MODBUS

− IEC 60870-5-103

− K-BUS/COURIER (not available)

− DNP3
1.2 Glossary
Ie : earth fault current measured
Ue : residual voltage measured directly by the input terminals on rear panel
Pe : earth fault power (Calculated)
IeCosPhi : active component of the earth fault current

MWh+ : positive active energy

MWh- : negative active energy
MVARh+ : positive re-active energy
MVARh- : negative re-active energy
MVAh : apparent energy
pf : soft weight of a 16 bits word
PF : heavy weight of a 16 bits word
Dec : decimal representation value
Hex : hexadecimal representation value
COURIER are not available yet (in grey colour)
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 6/148 MiCOM P125/P126 & P127

2. MODBUS PROTOCOL
MiCOM P12y relay can communicate by a RS 485 link. The terminals are placed on the rear
panel (terminals 31 and 32). See the GS document for further information on the wiring. The
applied ModBus protocol is compliance with the MODBUS RTU.
2.1 MODBUS connection technical characteristics
2.1.1 MODBUS connection parameters
The different parameters of the MODBUS connection are as follows:

− Isolated two-point RS485 connection (2kV 50Hz),

− MODBUS line protocol in RTU mode.

Communication speed can be configured by an operator dialog in the front panel of the
relay:

Baud rate (dec)

300
600
1200
2400
4800
9600
19200
38400

Transmission mode of the configured characters by operator dialog

Mode
1 start / 8 bits / 1 stop: total 10 bits
1 start / 8 bits / even parity / 1 stop: total 11 bits
1 start / 8 bits / odd parity / 1 stop: total 11 bits
1 start / 8 bits / 2 stop: total 11 bits

2.1.2 Exchanges messages synchronisation

Any character received after a silence on the line of more than or equal to a transmission
time of 3 bytes is considered as a frame start.
2.1.3 Message validity check
The validation of a frame is performed with a 16-bit cyclical redundancy check (CRC).
The generator polynomial is:
1 + x² + x15 + x16 = 1010 0000 0000 0001 binary = A001h
2.1.4 Address
In order to integrate a protection device into a control and monitoring system, the address
must be set from the local control panel. The address may be selected from the range of 1 to
255. The address 0 is reserved for broadcast messages.
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 7/148

2.2 MODBUS functions available in the protection device

Protection device data may be read or modified by using function codes. Following are the
available function codes. Function codes to read from or write into parameter cells in the
protection device are described in the listed following table.

Function Nr. Data Read Data Write Data Format & Type
1 X N bits
2 X N bits
3 X N words
4 X N words
5 X 1 bit
6 X 1 word
7 Fast 8 bits
8 X Diagnostics counter
11 X Event counter
15 X N bits
16 X N words

2.3 Description of the ModBus protocol

MODBUS is a master-slave protocol where every exchange involves a master device
request for data and a slave devices response with data.
2.3.1 Frame size received from the protection device (slave)
Frame transmitted from the master (query):

Slave number Function code Information CRC16

1 byte 1 byte n bytes 2 bytes
0 to FFh 1 to 10h

Slave address:
The slave address is in the range from 1 to 255. A transmitted frame with a slave address
equal to 0 is a globally addressed to all installed equipment (broadcast frame).
Function code:
The function code returned from the slave in the exception response frame is the code in
which the most significant bit (bit 7) is forced to 1.
Error code:
Among the 8 exception codes of the MODBUS protocol, the protection device manages two:

− Code 01: Function code unauthorised or unknown.

− Code 03: A value from the data field is unauthorised (incorrect code).

− Control of data being read

− Control of data being written
− Control of data address
− Length of request for data message
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 8/148 MiCOM P125/P126 & P127

CRC16:
The slave calculates the CRC16 value.
NOTE: The slave device does not respond to globally broadcast frames sent
out from the master.
2.3.2 Format of frames sent from the relay
Frame sent (response)

Slave number Function code Data CRC16

1 byte 1 byte n bytes 2 bytes
1 to FFh 1 to 10h

Slave address:
The slave address is in the range from 1 to 255.
Function code:
Processed MODBUS function (1 to 16).
Data:
Contains reply data to master query.
CRC 16:
CRC16 value calculated by the slave.
2.3.3 Messages validity check
When MiCOM P12y relay (slave) receives a master query, it validates the frame:

− If the CRC is incorrect, the frame is discarded as invalid. The slave does not reply to the
request for data. The master must retransmit its request for data. With the exception of
a broadcast message, this is the only case where the slave does not reply to a request
for data from the master.

− If the CRC is correct but the slave can not process the request for data, it sends an
exception response to the master.
Warning frame sent (response)

Slave number Function code Error code CRC16

1 byte 1 byte 1 byte 2 bytes
1 to FFh 81h or 83h or pf ... PF
8Ah or 8Bh

Slave number:
The address range of the slave device is between 1 and 255.
Function code:
The function code returned by the relay in the warning frame is the code in which the most
significant bit (bit 7) is forced to 1.
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 9/148

Warning code:
On the 8 warning codes of the MODBUS protocol, the relay manages two of them:

− code 01: function code unauthorised or unknown.

− code 03: a value in the data field is unauthorised ( incorrect data ).

- Control of pages being read
- Control of pages being written
- Control of addresses in pages
- Length of request messages

CRC16:
Value of the CRC16 calculated by the slave.
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 10/148 MiCOM P125/P126 & P127

3. DATABASE ORGANISATION
Application mapping are organised in pages. The characteristics are the following:

Page Data type Read Write Function Nr

permission permission
0h Product information, remote signalling, X 3, 4 and 5
measurements (part 1)
1h General remote parameters (part 1) X X 1, 2, 3, 4, 5, 6, 15
and 16
2h (24h) Setting group 1 remote parameters X X 3, 4, 6 and 16
3h (26h) Setting group 2 remote parameters X X 3, 4, 6 and 16
4h Remote controls X X 1, 2, 3, 4, 5, 6, 15
and 16
5h Boolean equations parameters X X 3, 4, 6 and 16
6h General remote parameters (part 2) X X 1, 2, 3, 4, 5, 6, 15
and 16
7h Device status Fast 3, 4 and 5
8h Time synchronisation X X 3, 4 and 16
9h – 22h Disturbance records X 3 and 4
23h Measurements (part 2) X 3, 4 and 5
28h Setting group 3 remote parameters X X 3, 4, 6 and 16
2Ah Setting group 4 remote parameters X X 3, 4, 6 and 16
2Ch Setting group 5 remote parameters X X 3, 4, 6 and 16
2Eh Setting group 6 remote parameters X X 3, 4, 6 and 16
30h Setting group 7 remote parameters X X 3, 4, 6 and 16
32h Setting group 8 remote parameters X X 3, 4, 6 and 16
35h – Event records X 3 and 4
36h
37h Fault records X 3 and 4
38h – Disturbance selection X 3 and 4
3Dh
3Eh Fault records X 3 and 4
5Ah Error counters X 3 and 4

They are completely listed below.

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 11/148

3.1 Product information, remote signalling, measurements

3.1.1 Page 0H - Product information, remote signalling, measurements (part 1)

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

Product
0000 Relay description characters 1 and 2 32 - 127 1 F10 • • •
Information

0001 Relay description characters 3 and 4 32 -127 1 F10 P1 • • •

0002 Relay description characters 5 and 6 32 -127 1 F10 20 • • •

0003 Unit reference characters 1 and 2 32 - 127 1 F10 AL • • •

0004 Unit reference characters 3 and 4 32 - 127 1 F10 ST • • •

0005 Software version 100 – xxx 1 F21 130 • • •

Front & rear port available

0006 0-3 F41 • • •
communication protocols

0007 Internal ratio phase current F1 • •

0008 Internal ratio earth current F1 • • •

0009 Internal ratio rated voltage F1 • • •

000A Internal ratio voltage F1 • • •

Info General Start /General Trip (only if

000B F95 • • •
IEC 60870-5-103 protocol)

000C LED status 0 - 256 1 F62 • • •

000D Digital inputs state, part 2 F20A • • •

000E Password status 0 -1 F24 0 • • •

000F HW alarm status F45 • • •

Remote
0010 Digital inputs status F12 • • •
signals

0011 Digital inputs state, part 1 F20 • • •

0012 Trip relay: output status 0-1 F22 • • •

0013 Output relays operation command F13 • • •

0014 Protection 67 Information of the threshold status I> F17 • •

0015 Information of the threshold status I>> F17 • •

Information of the threshold status

0016 F17 • •
I>>>

Protection
0017 Information of the threshold status Ie> F16 • • •
67n

Information of the threshold status

0018 F16 • • •
Ie>>

Information of the threshold status

0019 F16 • • •
Ie>>>

001A-001F Do not use (compatibility)

Information of the thermal protection

0020 Protection 49 F37 • •
status

Information of the undercurrent

0021 Protection 37 F17 • •
threshold status I<

Accessory Information of the status of the

0022 F38A • •
functions accessory functions 2/3

Information of the status of the

0023 F38 • •
accessory functions 1/3

0024 Do not used (compatibility)

0025 Alarms 1 Non acknowledged alarms , part 1 F36 • • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 12/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

Numbers of available disturbance

0026 Disturbance 0-5 F31 • • •
records

Trip relay Information on the starting origin of the

0027 See format F61 • • •
status trip relay

Circuit
0028 CB Supervision status F43 • •
Breaker

0029 Alarms 2 Non acknowledged alarms, part 2, F36A • • •

002A Alarms 3 Non acknowledged alarms, part 3, F36B • • •

002B Alarms 4 Non acknowledged alarms, part 4, F36C • • •

002C Alarms 5 Non acknowledged alarms, part 5, F36D • •

002D Alarms 6 Non acknowledged alarms, part 6, F36E

Output relays, latch configuration and

002E Relays F27 • • •
status

Accessory Information of the status of the

002F F38B • •
functions accessory functions 3/3

Remote
0030–0031 Phase A RMS current 1 10mA F18 • •
measurements

0032–0033 Phase B RMS current 1 10mA F18 • •

0034–0035 Phase C RMS current 1 10mA F18 • •

0036–0037 Earth RMS current 1 10mA F18 • • •

0038–0039 Inverse current I2 (fundamental) 1 10mA F18 • •

003A–003B Direct current I1 (fundamental) 1 10mA F18 • •

003C Ratio I2 / I1 0 - 999 1 % F1 • •

003D Thermal status (protected) 0 - 999 1 % F1 • •

003E Frequency 4500–6500 1 10mHz F1 • • •

003F–0040 Phase A RMS max current 1 10mA F18 • •

0041–0042 Phase B RMS max current 1 10mA F18 • •

0043–0044 Phase C RMS max current 1 10mA F18 • •

0045–0046 Phase A RMS average current 1 10mA F18 • •

0047–0048 Phase B RMS average current 1 10mA F18 • •

0049–004A Phase C RMS average current 1 10mA F18 • •

004B–004C Ie harmonic 1 10mA F18 • • •

Alarms 7 Non acknowledged alarms,

004D F36F • • •
part 7,

004E Module V1 F1 •

004F Module V2 F1 •

0050 Module IA F1 • •

0051 Module IB F1 • •

0052 Module IC F1 • •

0053 Module Ie F1 • • •

Angle between IA^IA

0054 0 Deg F1 • •
(reference)

0055 Angle between IA^IB 0-359 Deg F1 • •

0056 Angle between IA^IC 0-359 Deg F1 • •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 13/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

Angle between IA^Ie 0-359 Deg F1 • •

0057 Angle between Ie^Ie
0 Deg F1 •
(reference)

0058 Inverse current module I2 F1 • •

0059 Direct current module I1 F1 • •

005A Recloser 79 Nr. of total cycles 0-999 1 F1 • •

005B Nr. of cycles 1 0-999 1 F1 • •

005C Nr. of cycles 2 0-999 1 F1 • •

005D Nr. of cycles 3 0-999 1 F1 • •

005E Nr. of cycles 4 0-999 1 F1 • •

005F Nr. of definitive trips 0-999 1 F1 • •

0060 Nr. of tripping orders 0-999 1 F1 • •

Energy from 1 to
0061–0062 Positive active energy 9 1 kWh F18A •
measures 4.200 x 10

from 1 to
0063–0064 Negative active energy 9 1 kWh F18A •
4.200 x 10

from 1 to
0065–0066 Positive reactive energy 9 1 kVARh F18A •
4.200 x 10

from 1 to
0067–0068 Negative reactive energy 9 1 kVARh F18A •
4.200 x 10

0069–006A Rolling demand max RMS IA value 1 10mA F18 • •

006B–006C Rolling demand max RMS IB value 1 10mA F18 • •

006D–006E Rolling demand max RMS IC value 1 10mA F18 • •

006F Reserved

0070 Protection 27 Information of the threshold status U< F17 •

0071 Information of the threshold status U<< F17 •

Protection Information of the threshold status

0072 F16 • • •
32n Pe/ IeCos>

Information of the threshold status

0073 F16 • • •
Pe/ IeCos>>

0074 Reserved

0075 Angle between Ie^Ue 0-359 Deg F1 • • •

Information of the threshold

0076 Protection 59 F17 •
status U>

Information of the threshold

0077 F17 •
status U>>

0078–0079 Reserved

Protection Information of the threshold status

007A F16 • • •
59n Ue>>>>

Protection Information of the threshold status

007B F16 •
67n Ie>>>>

007C Protection 46 Information of the threshold status I2> F17 • •

Information of the threshold status

007D F17 • •
I2>>

Information of the threshold status

007E F17 • •
I2>>>
 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 14/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

Boolean
007F Boolean equation status F48 • •
equations

Voltage
0080–0081 Phase A RMS voltage 1 10mV F18A •
measurement

0082–0083 Phase B RMS voltage 1 10mV F18A •

0084–0085 Phase C RMS voltage 1 10mV F18A •

0086–0087 Earth RMS voltage 1 10mV F18A • • •

0088 Module UAB F1 •

0089 Module UBC F1 •

008A Module UCA F1 •

008B Module Ue F1 • • •

008C Angle between IA^UAB 0-359 Deg F1 •

008D Angle between IA^UBC 0-359 Deg F1 •

008E Angle between IA^UCA 0-359 Deg F1 •

008F Angle between IA^Ue 0-359 Deg F1 • •

0090–0092 Max phase A RMS voltage 1 10mV F18 •

0092–0093 Max phase B RMS voltage 1 10mV F18 •

0094–0095 Max phase C RMS voltage 1 10mV F18 •

0096–0097 Average phase A RMS voltage 1 10mV F18 •

0098–0099 Average phase B RMS voltage 1 10mV F18 •

009A–009B Average phase C RMS voltage 1 10mV F18 •

Power
009C–009D Module Pe CAN F18A • • •
measures
6
-999.9 10
009E–009F 3-Phase Active Power (P) 6 1 10Watt F18 •
to 999.9 10
6
-999.9 10
00A0–00A1 3-Phase Re-active Power (Q) 6 1 10VAR F18 •
to 999.9 10

00A2 3-Phase CosPHI -100 to 100 1 0.01 F2 •

00A3–00A4 Rolling demand average RMS IA value 1 10mA F18A • •

00A5–00A6 Rolling demand average RMS IB value 1 10mA F18A • •

00A7–00A8 Rolling demand average RMS IC value 1 10mA F18A • •

Power
00A9–00AA Module IeCos F18A • • •
measures
6
-999.9 10 10VA
00AB-00AC 3-Phase Apparent power (S) 6 1 F18 •
to 999.9 10

Energy Apparent energy from 1 to

00AD-00AE 9 1 kVAh F18A •
measures 3Ph V A Hours 4.200 x 10

00AF Measurement Module VA F1 •

00B0 Module VB F1 •

00B1 Module VC F1 •

00B2 Angle IA^VA 0-359 Deg F1 •

00B3 Angle IA^VB 0-359 Deg F1 •

00B4 Angle IA^VC 0-359 Deg F1 •

00B5 Inf. of the threshold status f1 0 to 7 1 F67 •

00B6 Inf. of the threshold status f2 0 to 7 1 F67 •

00B7 Inf. of the threshold status f3 0 to 7 1 F67 •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 15/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

00B8 Inf. of the threshold status f4 0 to 7 1 F67 •

00B9 Inf. of the threshold status f5 0 to 7 1 F67 •

00BA Inf. of the threshold status f6 0 to 7 1 F67 •

00BB F out 0 to 3 F69 •

00BC IRIG-B Synch- Date-and-time synchronisation origin 0 to 4 1 F79 • • •

ronisation
(Option)

00BD Optional Functions available ( read only ) 0 to 3 1 F80 0 • • •

board

00BE Inputs Digital inputs state, part 3 F20B • • •

00BF Status df/dt protection status 0 to 63 1 F94 •

-20 000 to 20
00C0 Measurements df/dt 1 mHz/s F2 •
000

00C1 Voltage of the reference channel F1 •

00C2–00C4 Not used

00C5 Measurements Module Ie der F1 •

00C6 Angle IA^Ie der Deg F1 •

00C7 CT Mease. CT Measurement presence 0 to 1 1 F24 0 •

00C6–00DF Reserved

16 x
00E0–00EF HMI screen Copy of HMI screen ASCII code
F10

00F0–00FF Reserved
 P12y/EN CT/E95 Communications
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Page 16/148 MiCOM P125/P126 & P127

3.1.2 Page 23H – Measurements / P127 with CT of measurement (part 2)

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

IA
2300 Fondamental Float 32bits F88 •
measurement

2302 THD 10000 1 0.01% F1 •

2303 Harmonic 2 10000 1 0.01% F1 •

2304 Harmonic 3 10000 1 0.01% F1 •

2305 Harmonic 4 10000 1 0.01% F1 •

2306 Harmonic 5 10000 1 0.01% F1 •

2307 Harmonic 6 10000 1 0.01% F1 •

2308 Harmonic 7 10000 1 0.01% F1 •

2309 Harmonic 8 10000 1 0.01% F1 •

230A Harmonic 9 10000 1 0.01% F1 •

230B Harmonic 10 10000 1 0.01% F1 •

230C–2319 Reserve •

231A TDD 0-65534 1 0.01% F1 •

Angle Iam^Iam ( always 0 ) 360°/6

231B 0-65534 1 F1 0 •
5536

231C–231D RMS Float 32bits F88 •

231E Reserved •

231F K factor 0-65534 1 0.01% F1 •

IB
2320 Fondamental Float 32bits F88 •
measurement

2322 THD 10000 1 0.01% F1 •

2323 Harmonic 2 10000 1 0.01% F1 •

2324 Harmonic 3 10000 1 0.01% F1 •

2325 Harmonic 4 10000 1 0.01% F1 •

2326 Harmonic 5 10000 1 0.01% F1 •

2327 Harmonic 6 10000 1 0.01% F1 •

2328 Harmonic 7 10000 1 0.01% F1 •

2329 Harmonic 8 10000 1 0.01% F1 •

232A Harmonic 9 10000 1 0.01% F1 •

232B Harmonic 10 10000 1 0.01% F1 •

232C–2339 Reserve •

233A TDD 0-65534 1 0.01% F1 •

Angle Ibm^Iam 360°/6

233B 0-65534 1 F1 •
5536

233C–233D RMS Float 32bits F88 •

233E Reserved •

233F K factor 0-65534 1 0.01% F1 •

IC
2340 Fondamental Float 32bits F88 •
measurement

2342 THD 10000 1 0.01% F1 •

2343 Harmonic 2 10000 1 0.01% F1 •

2344 Harmonic 3 10000 1 0.01% F1 •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 17/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

2345 Harmonic 4 10000 1 0.01% F1 •

2346 Harmonic 5 10000 1 0.01% F1 •

2347 Harmonic 6 10000 1 0.01% F1 •

2348 Harmonic 7 10000 1 0.01% F1 •

2349 Harmonic 8 10000 1 0.01% F1 •

234A Harmonic 9 10000 1 0.01% F1 •

234B Harmonic 10 10000 1 0.01% F1 •

234C–2359 Reserve •

235A TDD 0-65534 1 0.01% F1 •

Angle Icm^Iam 360°/6

235B 0-65534 1 F1 •
5536

235C–235D RMS Float 32bits F88 •

235E Reserved •

235F K factor 0-65534 1 0.01% F1 •

2360 VA or UAB Fondamental Float 32bits F88 •

2362 THD 10000 1 0.01% F1 •

2363 Harmonic 2 10000 1 0.01% F1 •

2364 Harmonic 3 10000 1 0.01% F1 •

2365 Harmonic 4 10000 1 0.01% F1 •

2366 Harmonic 5 10000 1 0.01% F1 •

2367 Harmonic 6 10000 1 0.01% F1 •

2368 Harmonic 7 10000 1 0.01% F1 •

2369 Harmonic 8 10000 1 0.01% F1 •

236A Harmonic 9 10000 1 0.01% F1 •

236B Harmonic 10 10000 1 0.01% F1 •

236C–2379 Reserve •

360°/6
237A Angle Va^Ia or Uab^Ic 0-65534 1 F1 •
5536

Angle Va^Iam or Uab^Iam 360°/6

237B 0-65534 1 F1 •
5536

237C–237D RMS Float 32bits F88 •

237E Reserved •

237F K factor 0-65534 1 0.01% F1 •

2380 VB or UBC Fondamental Float 32bits F88 •

2382 THD 10000 1 0.01% F1 •

2383 Harmonic 2 10000 1 0.01% F1 •

2384 Harmonic 3 10000 1 0.01% F1 •

2385 Harmonic 4 10000 1 0.01% F1 •

2386 Harmonic 5 10000 1 0.01% F1 •

2387 Harmonic 6 10000 1 0.01% F1 •

2388 Harmonic 7 10000 1 0.01% F1 •

2389 Harmonic 8 10000 1 0.01% F1 •

238A Harmonic 9 10000 1 0.01% F1 •

238B Harmonic 10 10000 1 0.01% F1 •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 18/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

238C–2399 Reserve •

360°/6
239A Angle Vb^Ib or Ubc^Ia 0-65534 1 F1 •
5536

360°/6
239B Angle Vb^Iam or Ubc^Iam 0-65534 1 F1 •
5536

239C–239D RMS Float 32bits F88 •

239E Reserved •

239F K factor 0-65534 1 0.01% F1 •

23A0 VC or UCA Fondamental Float 32bits F88 •

23A2 Harmonic distortion percentage 10000 1 0.01% F1 •

23A3 Harmonic 2 10000 1 0.01% F1 •

23A4 Harmonic 3 10000 1 0.01% F1 •

23A5 Harmonic 4 10000 1 0.01% F1 •

23A6 Harmonic 5 10000 1 0.01% F1 •

23A7 Harmonic 6 10000 1 0.01% F1 •

23A8 Harmonic 7 10000 1 0.01% F1 •

23A9 Harmonic 8 10000 1 0.01% F1 •

23AA Harmonic 9 10000 1 0.01% F1 •

23AB Harmonic 10 10000 1 0.01% F1 •

23AC–23B9 Reserve •

360°/6
23BA Angle Vc^Ic or Uca^Ib 0-65534 1 F1 •
5536

360°/6
23BB Angle Vc^Iam or Uca^Iam 0-65534 1 F1 •
5536

23BC–23BD RMS Float 32bits F88 •

23BE Reserved •

23BF K factor 0-65534 1 0.01% F1 •

Power &
23C0 Active Power Float 32bits F88 •
Energie

23C2 Reactive Power Float 32bits F88 •

23C4 Apparent power Float 32bits F88 •

23C6 Displacement power factor 10000 1 0.01% F1 •

23C7 Reserve 10000 1 0.01% F1 •

23C8 Positive active energy Float 32 bits Wh F88 •

23CA Negative active energy Float 32 bits Wh F88 •

23CC Positive reactive energy Float 32 bits VAR h F88 •

23CE Negative reactive energy Float 32 bits VAR h F88 •

Energy time origin - PRIVATE

23D0-23D1 FORMAT / number of seconds since F18 •
01/01/1994

Energy time origin - PRIVATE

23D2-23D3 F18 •
FORMAT / milliseconds

23D4-23FF Reserved
 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 19/148

3.2 General remote parameters

3.2.1 Page 1H - General remote parameters (part 1)

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0100 Remote Address of front port: 1 F1 1 • • •

setting
MODBUS 1 - 255

0101 Language 0 – 14 F63 • • •

0102 Password, ASCII digits 1 and 2 32 – 127 1 F10 AA • • •

0103 Password, ASCII digits 3 and 4 32 – 127 1 F10 AA • • •

0104 OP Rated frequency 50 – 60 10 Hz F1 50 • • •

Parameters

0105 General Phase and Earth labels 0-1–2 1 F85 0 • • •

Options

0106–0108 Free (not used)

0109 Default display 0–4 1 F26 4 • •

010A User reference, ASCII digits 1 32 - 127 1 F10 AL • • •

and 2

010B User reference, ASCII digits 3 32 - 127 1 F10 ST • • •

and 4

010C Number of the default records to be 1- 25 1 F31A 25 • • •

displayed

010D Inputs mode configuration (edge or 1 F54A • • •

level), part 2,

010E Maintenance Mode 0-1 1 F24 0 • • •

010F Digital inputs signal type: AC–DC 0-1 1 F51 1 • • •

0110 CB monitoring CB operations number 1 F1 • •

measurements

0111 CB operating time 1 10ms F1 • •

n
0112–0113 Switched square Amps phase A A F18 • •
summation
n
0114–0115 Switched square Amps phase B A F18 • •
summation
n
0116–0117 Switched square Amps phase C A F18 • •
summation

0118 Circuit breaker closing time 1 10ms F1 • •

0119 Digital input Digital input 1, part 2 1 F15A • • •

011A Digital input 2, part 2 1 F15A • • •

011B Digital input 3, part 2 1 F15A • • •

011C Digital input 4, part 2 1 F15A • • •

011D Digital input 5, part 2 1 F15A • •

011E Digital input 6, part 2 1 F15A • •

011F Digital input 7, part 2 1 F15A • •

0120 Ratios CT Primary phase CT 1 - 9999 1 A F1 1 • •

0121 Secondary phase CT 1 or 5 A F1 1 • •

0122 Primary earth CT 1 - 9999 1 A F1 1 • • •

0123 Secondary earth CT 1 or 5 A F1 1 • • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 20/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

Ratios VT

0124–0125 Primary phase 57 - 130V operating range 10 –100000 1 10V F18A 100V •
VT
220 - 480V operating range 220 – 480 1 V F18A 220V •

0126 Secondary 57 - 130V operating range 570 -1300 1 100mV F1 100V •

phase VT
220 - 480V operating range 2200 1 100mV F1 220V •

0127 Scheme VTs VTs connection mode: 0, 2, 4 F7 0 •

connection 3Vpn, 2Vpp+Vr, 2Vpn+Vr

0128 –0129 Primary earth 57 - 130V operating range 10 -100000 1 10V F18A 100 • • •
VT V

220 - 480V operating range 220 – 480 1 V F18A 220V • • •

012A Secondary 57 - 130V operating range 570 -1300 1 100mV F1 100V • • •

earth VT
220 - 480V operating range 2200 1 100mV F1 220V • • •

012B Maintenance mode relays command F13 • • •

012C Obsolete

012D Number Instantaneous record to be 1- 5 1 F31B 5 • • •

displayed

012E Communi- Communication speed (Baud): 1 F53 • • •

cation
IEC 60870-5-103 0-1 1

DNP3 0-5 4

012F Date format 0-1 1 F52 0 • • •

0130 Communication speed (Baud) 0-7 1 F4 6 • • •

0131 Parity 0-2 1 F5 0 • • •

0132 Address of rear port: 1 F1 1 • • •

DNP3 / IEC 60870-5-103 1- 59999 / 1-
255

0133 Stop bits 0-1 1 F29 0 • • •

0134 COM available info 0 - 15 1 F30 1 • • •

0135 Configuration Active group 1-8 1 F55 1 •

group 1-2 • •

0136 LED Led 5, part 1 1 F19 0 • • •

0137 Led 6, part 1 1 F19 0 • • •

0138 Led 7, part 1 1 F19 0 • • •

0139 Led 8, part 1 1 F19 0 • • •

013A Led 5, part 2 1 F19A 0 • • •

013B Led 6, part 2 1 F19A 0 • • •

013C Led 7, part 2 1 F19A 0 • • •

013D Led 8, part 2 1 F19A 0 • • •

013E Led 5, part 3 1 F19B 0 • • •

013F Led 6, part 3 1 F19B 0 • • •

0140 Led 7, part 3 1 F19B 0 • • •

0141 Led 8, part 3 1 F19B 0 • • •

0142 Digital inputs Inputs mode configuration (edge or F54 • • •

configuration level)

0143 Inputs sense configuration (High or 1 F47 0 • • •

Low)
 Communications P12y/EN CT/E95
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MiCOM P125/P126 & P127 Page 21/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0144 Digital input Digital input 6, part 1 1 F15 0 • •

0145 Digital input 7, part 1 1 F15 0 • •

0146 Digital input 1, part 1 1 F15 0 • • •

0147 Digital input 2, part 1 1 F15 0 • • •

0148 Digital input 3, part 1 1 F15 0 • • •

0149 Digital input 4, part 1 1 F15 0 • • •

014A Digital input 5, part 1 1 F15 0 • •

014B Output relays Output relays: Broken conductor 1 F14 0 • •

014C Output relays: Breaker failure 1 F14 0 • •

014D Protection 37 Output relays: tI< 1 F14 0 • •

014E Alarm Self reset start protection alarms 0-1 1 F24 0 • • •

enable / disable

014F Protection 49 Output relays: Thermal overload 1 F14 0 • •

alarm(θ alarm)

0150 Output relays: Thermal overload 1 F14 0 • •

tripping (θ trip)

0151 Circuit Output relays: Switch on to fault, circuit 1 F14A 0 • •

breaker breaker tripping & SOTF/TOR

0152 Output relays: tAUX 1 1 F14 0 • • •

0153 Output relays: tAUX 2 1 F14 0 • • •

0154 Output relays: circuit breakers alarms 1 F14 0 • •

0155 Output relays: Trip circuit supervision 1 F14 0 • •

0156 Output Fail safe and inversion relays 1 F56 0 • • •

Relays

0157 Conf. Block relay on I> start 0-1 1 F24 0 • •

0158 Conf. Block relay on Ie> start 0-1 1 F24 0 • •

0159 Output relays: tIA> 1 F14 0 • •

015A Output relays: tIB> 1 F14 0 • •

015B Output relays: tIC> 1 F14 0 • •

015C RL1-RL8: configuration and latch 1 F27 0 • • •

015D Output relays: Trip output relay RL1 on 1 F14 0 • • •

RLx

015E Protection 67 Output relays: tI> 1 F14 0 • •

015F Output relays: tI>> 1 F14 0 • •

0160 Output relays: tI>>> 1 F14 0 • •

0161 Protection Output relays: tIe> 1 F14 0 • • •

67n

0162 Output relays: tIe>> 1 F14 0 • • •

0163 Output relays: tIe>>> 1 F14 0 • • •

0164 Protection 67 Output relays: I> 1 F14 0 • •

0165 Output relays: I>> 1 F14 0 • •

0166 Output relays: I>>> 1 F14 0 • •

0167 Protection Output relays: Ie> 1 F14 0 • • •

67n

0168 Output relays: Ie>> 1 F14 0 • • •

0169 Output relays: Ie>>> 1 F14 0 • • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 22/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

016A Recloser 79 Output relays: recloser running 1 F14 0 • •

016B Output relays: definitive tripping & 1 F14D 0 • •

Recloser int. locked (conf.)

016C Tripping Conf. tripping on relay RL1, 1 F6 1 • • •

part 1

016D Breaker Current Threshold 2 -100 1 1/100 F1 2 • •

Failure In

016E Blocking Blocking logic 1, part 1 1 F8 0 • • •

Logic

016F Blocking logic 2, part 1 1 F8 0 • •

0170 Broken Brkn. Cond. operating mode 0-1 1 F24 0 • •

Conductor

0171 Brkn. Cond. trip delay time 0 - 14400 1 s F1 1 • •

0172 Brkn. Cond. limit 20 - 100 1 F1 100 • •

0173 Cold Load PU Operating mode 0-1 1 F24 0 • •

0174 Cold load start thresholds 1 F33 0 • •

0175 Percentage of desensitization 20 - 800 1 % F1 100 • •

0176 Desensitising timer 1 - 36000 1 100ms F1 1 • •

0177 Breaker Breaker Failure operating mode 0-1 1 F24 0 • •

failure

0178 Breaker failure delay time 0 - 1000 1 10ms F1 0 • •

0179 Selectivity Digital selectivity 1 1 F40 0 • •

017A Digital selectivity 2 1 F40 0 • •

017B tSel1 0 - 15000 1 10ms F1 0 • •

017C tSel2 0 - 15000 1 10ms F1 0 • •

017D Disturbance Pre-trigger time 5 rec: 1 to 29 1 100ms F1 1 • • •

4 rec: 1 to 29
3 rec: 1 to 49
2 rec: 1 to 69
1 rec: 1 to 89

017E Do not use: not available for

compatibility reasons

017F Config. Disturbance start 0-1 1 F32 0 • •

0180 CB CB open operating mode 0-1 1 F24 0 • •

monitoring

0181 CB open time thereshold 5 - 100 5 10ms F1 5 • •

0182 Operations number 0-1 1 F24 0 • •

0183 CB opening operations number 0 - 50000 1 F1 0 • •

threshold.

0184 CB switched Amps sum 0-1 1 F24 0 • •

E
0185 CB switched Amps sum threshold 10 6 F1 • •
n
A

0186 Amps or square Amps 1-2 1 F1 1 • •

0187 Closing time threshold 5 - 100 5 10ms F1 5 • •

0188 Auxiliary timer 1 0 - 20000 1 10ms F1 0 • • •

0189 Auxiliary timer 2 0 - 20000 1 10ms F1 0 • • •

018A Max & average (current + voltage) 5 – 10 – 15 – VTA mn F42 5 • •

time window selection 30 - 60
 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 23/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

018B CB open pulse duration 10 - 500 1 10ms F1 10 • • •

018C CB close pulse duration 10 - 500 1 10ms F1 10 • • •

018D CB close operating mode 0-1 1 F24 0 • •

018E CB supervision operating mode 0-1 1 F24 0 • •

018F Trip circuit time 10 - 1000 1 10ms F1 • •

0190 Blocking Blocking logic 1, part 2 1 F8A 0 • •

logic

0191 Blocking logic 2, part 2 1 F8A 0 • •

0192 Tripping Conf. tripping on relay RL1, 1 F6A 0 • •

part 2

0193 Auxiliary timer 3 0 - 20000 1 10ms F1 0 • •

0194 Auxiliary timer 4 0 - 20000 1 10ms F1 0 • • •

0195-019C Do not use (Courier description)

019D Protection Output relays: Ie> reverse 1 F14 0 • • •

67n

019E Output relays: Ie>> reverse 1 F14 0 • • •

019F Output relays: Ie>>> reverse 1 F14 0 • • •

01A0 Protection Output relays: Pe/Iecos> 1 F14 0 • • •

32n

01A1 Output relays: tPe/Iecos> 1 F14 0 • • •

01A2 Output relays: Pe/Iecos>> 1 F14 0 • • •

01A3 Output relays: tPe/Iecos>> 1 F14 0 • • •

01A4 Protection 59 Output relays: U> 1 F14 0 •

01A5 Output relays: tU> 1 F14 0 •

01A6 Output relays: U>> 1 F14 0 •

01A7 Output relays: tU>> 1 F14 0 •

01A8 Protection Output relays: Ue>>>> 1 F14 0 • • •

59N

01A9 Output relays: tUe>>>> 1 F14 0 • • •

01AA Protection 67 Output relays: I> reverse 1 F14 0 • •

01AB Output relays: I>> reverse 1 F14 0 • •

01AC Output relays: I>>> reverse 1 F14 0 • •

01AD Protection 27 Output relays: U< 1 F14 0 •

01AE Output relays: tU< 1 F14 0 •

01AF Output relays: U<< 1 F14 0 •

01B0 Output relays: tU<< 1 F14 0 •

01B1 Protection 46 Output relays: I2> 1 F14 0 • •

01B2 Output relays: tI2> 1 F14 0 • •

01B3 Output relays: I2>> 1 F14 0 • •

01B4 Output relays: tI2>> 1 F14 0 • •

01B5 Output relays: I2>>> 1 F14 0 • •

01B6 Output relays: tI2>>> 1 F14 0 • • •

01B7-01DE Obsolete (Ex AND Logic Equa)

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 24/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

01DF Boolean Tripping equation A time 0 - 60000 1 10ms F1 0 • •

Equations

01E0 Reset equation A time 0 - 60000 1 10ms F1 0 • •

01E1 Output relays: tEqu. A F14 0 • •

01E2 Tripping equation B time 0 - 60000 1 10ms F1 0 • •

01E3 Time reset equation B time 0 - 60000 1 10ms F1 0 • •

01E4 Output relays: tEqu. B F14 0 • •

01E5 Tripping equation C time 0 - 60000 1 10ms F1 0 • •

01E6 Reset equation C time 0 - 60000 1 10ms F1 0 • •

01E7 Output relays: tEqu. C F14 0 • •

01E8 Tripping equation D time 0 - 60000 1 10ms F1 0 • •

01E9 Reset equation D time 0 - 60000 1 10ms F1 0 • •

01EA Output relays: tEqu. D F14 0 • •

01EB Output relays: tAUX 3 & tAUX 4 1 F14B 0 • • •

01EC Output relays: Control Trip & Control 1 F14C 0 • • •

Close

01ED Output relays: I< F14 0 • •

01EE Output relays: Group 2 active F14 • • •

01EF LED Led 5, part 4 1 F19C 0 • • •

01F0 Led 6, part 4 1 F19C 0 • • •

01F1 Led 7, part 4 1 F19C 0 • • •

01F2 Led 8, part 4 1 F19C 0 • • •

01F3 Obsolete

01F4 Obsolete

01F5 Self-reset LEDs on fault 0-1 1 F24 1 • • •

01F6 Temporal opening for Rolling 1 - 60 1 mn F1 1 • •

Subperiod

01F7 Number of Subperiods considered 1 – 24 1 F1 1 • •

01F8 Switch onto Fault (SOTF) 0 – 32771 1 F58 1 • •

01F9 SOTF time 0 – 500 1 ms F1 100 • •

01FA 51V function 51V configuration 0–3 1 F59 0 •

01FB V2> value 57 – 130V operating range 30 -2000 1 100mV F1 1300 •

220 – 480V operating range 200 -7200 5 100mV F1 4800 •

01FC V2>> value 57 – 130V operating range 30 -2000 1 100mV F1 1300 •

220 – 480V operating range 200 -7200 5 100mV F1 4800 •

01FD VTS function VTS configuration 0–7 1 F60 0 •

01FE VTS conv. directional to non-dir. 0-7Fh 1 F65 7Fh •

01FF U< blocking 57 – 130V operating range 50 -1300 1 100mV F1 50 •

frequency 220 – 480V operating range 200 - 4800 5 100mV F1 200 •
protection
 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 25/148

3.2.2 Page 6H - General remote parameters (part 2)

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0600 Configuration Alarms inhibition part1 F64 1FF • • •

C

0601 Phase rotation 0-1 1 F66 0 • •

0602 Alarms inhibition part 2 F64A FF • • •

0603 Alarms inhibition part 3 F64B 0 • • •

0604 Disturbance Disturbances record number 1–5 1 F1 5 • • •

0605 Cold Load PU Cold load start mode 0–3 1 F87 1 • •

0606-060B Reserved

060C LED Led 5, part 5 1 F19D 0 •

060D Led 6, part 5 1 F19D 0 •

060E Led 7, part 5 1 F19D 0 •

060F Led 8, part 5 1 F19D 0 •

0610 Output relays Output relays: P> 1 F14 0 •

0611 Output relays: tP> 1 F14 0 •

0612 Output relays: P>> 1 F14 0 •

0613 Output relays: tP>> 1 F14 0 •

0614 Output relays: f1 1 F14 0 •

0615 Output relays: tf1 1 F14 0 •

0616 Output relays: f2 1 F14 0 •

0617 Output relays: tf2 1 F14 0 •

0618 Output relays: f3 1 F14 0 •

0619 Output relays: tf3 1 F14 0 •

061A Output relays: f4 1 F14 0 •

061B Output relays: tf4 1 F14 0 •

061C Output relays: f5 1 F14 0 •

061D Output relays: tf5 1 F14 0 •

061E Output relays: f6 1 F14 0 •

061F Output relays: tf6 1 F14 0 •

0620 Output relays: F out 1 F14 0 •

0621 Output relays: Input 1 1 F14 0 •

0622 Output relays: Input 2 1 F14 0 •

0623 Output relays: Input 3 1 F14 0 •

0624 Output relays: Input 4 1 F14 0 •

0625 Output relays: Input 5 1 F14 0 •

0626 Output relays: Input 6 1 F14 0 •

0627 Output relays: Input 7 1 F14 0 •

0628 Output relays: VTS 1 F14 0 •

0629 Output relays: Input 8 1 F14 0 •

062A Output relays: Input 9 1 F14 0 •

062B Output relays: Input A 1 F14 0 •

062C Output relays: Input B 1 F14 0 •

062D Output relays: Input C 1 F14 0 •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 26/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

062E Tripping Conf. tripping on relay RL1, part 4 1 F6C 0 • •

062F Reserved

0630 Automation Inrush validation 0-1 1 F24 0 •

0631 Inrush blocking selection F83 0 •

0632 Inrush harmonic 2 ratio 100-350 1 0.1% F1 200 •

0633 tInrush_reset 0 - 200 10 10ms F1 0 •

0634 Blocking logic 1, part 3 1 F8B 0 •

0635 Blocking logic 2, part 3 1 F8B 0 •

0636 Tripping Conf. tripping on relay RL1, part 3 1 F6B 0 • •

0637 VTS delay time 0 10000 1 10ms F1 20 •

0638-063F Reserved

0640 Boolean Tripping equation E time 0 - 60000 1 10ms F1 0 • •

Equations

0641 Reset equation E time 0 - 60000 1 10ms F1 0 • •

0642 Output relays: tEqu. E F14 0 • •

0643 Tripping equation F time 0 - 60000 1 10ms F1 0 • •

0644 Time reset equation F time 0 - 60000 1 10ms F1 0 • •

0645 Output relays: tEqu. F F14 0 • •

0646 Tripping equation G time 0 - 60000 1 10ms F1 0 • •

0647 Reset equation G time 0 - 60000 1 10ms F1 0 • •

0648 Output relays: tEqu. G F14 0 • •

0649 Tripping equation H time 0 - 60000 1 10ms F1 0 • •

064A Reset equation H time 0 - 60000 1 10ms F1 0 • •

064B Output relays: tEqu. H F14 0 • •

064C-064D Auxiliary timer 5 0 – 2 000 000 1 10ms F18A 0 • •

064E-064F Auxiliary timer 6 0 – 2 000 000 1 10ms F18A 0 • •

0650-0641 Auxiliary timer 7 0 – 2 000 000 1 10ms F18A 0 • •

0652 Reserved • • •

0653 Auxiliary timer 8 (Option) 0 - 20000 1 10ms F1 0 •

0654 Auxiliary timer 9 (Option) 0 - 20000 1 10ms F1 0 •

0655 Auxiliary timer A (Option) 0 - 20000 1 10ms F1 0 •

0656 Auxiliary timer B (Option) 0 - 20000 1 10ms F1 0 •

0657 Auxiliary timer C (Option) 0 - 20000 1 10ms F1 0 •

0658 LED Led 5, part 6 1 F19E 0 • •

0659 Led 6, part 6 1 F19E 0 • •

065A Led 7, part 6 1 F19E 0 • •

065B Led 8, part 6 1 F19E 0 • •

065C Led 5, part 7 1 F19F 0 • •

065D Led 6, part 7 1 F19F 0 • •

065E Led 7, part 7 1 F19F 0 • •

065F Led 8, part 7 1 F19F 0 • •

0660 Communicati Communication speed (Baud) 0-7 1 F4 6 • • •

on port 2
(Option)
 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 27/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0661 Parity 0-2 1 F5 0 • • •

0662 Stop bits 0-1 1 F29 0 • • •

0663 Address of rear port 2: 1 F1 1 • • •

MODBUS 1 - 255
IEC 60870-5-103 1 – 254

DNP3 1 - 59999

0664 IEC870-5-103 only: source setting 1-8 1 F55 1 •

group for copy

0665 IEC870-5-103 only: destination setting 1-8 1 F55 2 •

group for copy

0666 IEC870-5-103 IEC870-5-103 only: Spontaneous 0-3 1 F74 3 • • •

port 1 event enabling

0667 IEC870-5-103: 0-7 1 F75 3 • • •

Measurements enabling

0668 IEC870-5-103 Measurements/ 0-3 1 F78 0 • • •

Commands Blocking

0669 IEC870-5-103 GI selection port 1 0-1 1 F93 0 • • •

066A IEC870-5-103 IEC870-5-103 command & setting write 1 - 300 1 100 ms F1 2 •

timeout

066B IEC870-5-103 IEC870-5-103 only, port 2: 0-3 1 F74 3 •

port 2 Spontaneous event enabling

066C IEC870-5-103, port 2: 0-7 1 F75 3 •

Measurements enabling

066D IEC870-5-103, port 2: Measurements/ 0-3 1 F78 0 •

Commands Blocking

066E IEC870-5-103, port 2: GI selection 0-1 1 F93 0 •

066F Reserved

0670 Digital input Digital input 8, part 1 1 F15 0 • • •

(Option)

0671 Digital input 9, part 1 1 F15 0 • • •

0672 Digital input A, part 1 1 F15 0 • • •

0673 Digital input B, part 1 1 F15 0 • • •

0674 Digital input C, part 1 1 F15 0 • •

0675-0678 Reserved

0679 Digital input 8, part 2 1 F15A 0 • • •

067A Digital input 9, part 2 1 F15A 0 • • •

067B Digital input A, part 2 1 F15A 0 • • •

067C Digital input B, part 2 1 F15A 0 • • •

067D Digital input C, part 2 1 F15A 0 • •

067E-0681 Reserved

0682 IRIG-B Synch- Date-and-time synchronisation mode 1 F76 0 • • •

ronisation
(Option)

0683 IRIG-B mode (Signal type) 1 F77 0 • • •

0684 Reserve

0685 Output relays Output relays: tAux 5 1 F14 0 • •

0686 Output relays: tAux 6 1 F14 0 • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 28/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0687 Output relays: tAux 7 1 F14 0 • •

0688 Output relays Output relays: tAux 8 1 F14 0 •

(Optional
board)

0689 Output relays: tAux 9 1 F14 0 •

068A Output relays: tAux A 1 F14 0 •

068B Output relays: tAux B 1 F14 0 •

068C Output relays: tAux C 1 F14 0 •

068D Output relays Output relays: Ie>>>> 1 F14 0 • •

068E Output relays: tIe>>>> 1 F14 0 • •

068F Output relays: Ie_>>>> reverse 1 F14 0 • •

0690 Output relays: [79] Ext.Lock. 1 F14 0 • •

0691 Output relays: 51V 1 F14 0 •

0692 Digital inputs Digital input 1, part 3 0 F15B 0 • • •

0693 Digital input 2, part 3 0 F15B 0 • • •

0694 Digital input 3, part 3 0 F15B 0 • • •

0695 Digital input 4, part 3 0 F15B 0 • • •

0696 Digital input 5, part 3 0 F15B 0 • • •

0697 Digital input 6, part 3 0 F15B 0 • • •

0698 Digital input 7, part 3 0 F15B 0 • • •

0699 Digital input 8, part 3 0 F15B 0 • • •

069A Digital input 9, part 3 0 F15B 0 • • •

069B Digital input A, part 3 0 F15B 0 • • •

069C Digital input B, part 3 0 F15B 0 • • •

069D Digital input C, part 3 0 F15B 0 • • •

069E Automation/ SOTF source activation 0 – 127 1 F82 1B • •

SOTF

069F Connexion Vt protection 0-1 1 F84 0 •

06A0 LED Led 5, part 8 F19G 0 • •

06A1 Led 6, part 8 F19G 0 • •

06A2 Led 7, part 8 F19G 0 • •

06A3 Led 8, part 8 F19G 0 • •

06A4 CTS CTS operating mode 0-1 1 F24 0 •

supervision

06A5 I2 / I1 threshold (futur use) 20 - 100 1 % F1 20 •

06A6 Idiff threshold (futur use) 10 - 90 1 % F1 50 •

06A7 Ie threshold 8 - 100 1 1/100 F1 8 •

In

06A8 Ve threshold •
range A 5 - 220 1 0.1V F1 50
range B 20 - 880 5 0.1V F1 200

06A9 t CTS timer 0 – 10000 1 0.01 s F1 20 •

06AA Output relays Output relays: CTS 1 F14 0 •

06AB General df/dt cycles number 1 – 200 1 F1 5 •

Config

06AC df/dt validations number 1 – 12 1 F1 4 •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 29/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

06AD >20 Hz/s df/dt block inhibition 0-1 1 F24 0 •

06AE Blocking Blocking logic 1, part 4 1 F8C 0 •

Logic

06AF Blocking logic 2, part 4 1 F8C 0 •

06B0 Output relays Output relays: df/dt1 1 F14 0 •

06B1 Output relays: df/dt2 1 F14 0 •

06B2 Output relays: df/dt3 1 F14 0 •

06B3 Output relays: df/dt4 1 F14 0 •

06B4 Output relays: df/dt5 1 F14 0 •

06B5 Output relays: df/dt6 1 F14 0 •

06B6 Ratios CTm Primary CTm 1 - 9999 1 A F1 1 2

06B7 Secondary CTm 1 or 5 A F1 1 2

06B8 CTm CTm1 connection 0-3 1 F90 0 2

connection

06B9 CTm2 connection 0-3 1 F90 0 2

06BA Power Quadrant power 1–4 1 F91 4 2

06BB Not used

06BC Inputs mode configuration (edge or 1 F54B 0 • • •

level), part 3,

06BD Group Group number for digital input inactive 1-8 1 F55 1 •
changing

06BE Group number for digital input active 1-8 1 F55 2 •

06BF Target group 0-8 1 F55 0 •

06C0 Output relays Output relays: P< 1 F14 0 •

06C1 Output relays: tP< 1 F14 0 •

06C2 Output relays: P<< 1 F14 0 •

06C3 Output relays: tP<< 1 F14 0 •

06C4 Output relays: Q> 1 F14 0 •

06C5 Output relays: tQ> 1 F14 0 •

06C6 Output relays: Q>> 1 F14 0 •

06C7 Output relays: tQ>> 1 F14 0 •

06C8 Output relays: Q< 1 F14 0 •

06C9 Output relays: tQ< 1 F14 0 •

06CA Output relays: Q<< 1 F14 0 •

06CB Output relays: tQ<< 1 F14 0 •

06CC Output relays: Comm. order 1 1 F14 0 •

06CD Output relays: Comm. order 2 1 F14 0 •

06CE Output relays: Comm. order 3 1 F14 0 •

06CF Output relays: Comm. order 4 1 F14 0 •

06D0 Com order T comm. Order 1 10 – 60000 5 1/100 F1 10 •

tempo

06D1 T comm. Order 2 10 – 60000 5 1/100 F1 10 •

06D2 T comm. Order 3 10 – 60000 5 1/100 F1 10 •

06D3 T comm. Order 4 10 – 60000 5 1/100 F1 10 •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 30/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

06D4 Td demand Iam Td demand 0 – 20000 1 0.01% F1 10 •

IN 000

06D5 Ibm Td demand 0 – 20000 1 0.01% F96 0 •

IN

06D6 Icm Td demand 0 – 20000 1 0.01% F96 0 •

IN

06D7-06FF Not used

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 31/148

3.3 Protection groups parameters

3.3.1 Page 2H - Setting group 1 remote parameters
Also mapped at page 24H.

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0200 Protection I> operating mode 0-1-2 1 F24A 0 • •

50/51/67

0201 I> value 10 - 2500 1 1/100 F1 100 • •

In

0202 Trip time type I> F3 0 • •

0203 DMT Trip time I> 0 - 15000 1 10ms F1 0 • •

0204 TMS: I> trip time multiplier 25 - 1500 1 0.001 F1 25 • •

0205 K: I>trip time multiplier for RI type 100 -10000 5 0.001 F1 100 • •
curve

0206 Reset time type: DMT / IDMT 0-1 1 F34 0 • •

0207 DMT reset time I> 0 - 10000 1 10ms F1 100 • •

0208 RTMS: I> reset time multiplier 25 - 3200 1 0.001 F1 25 • •

0209 Torque (RCA) angle I^U> 0 - 359 1 Degree F1 0 •

020A Trip angle I^U> 10 -170 1 Deg F1 50 •

020B Interlock I> 0-1 F24 0 • •

020C I>> operating mode 0–1-2 1 F24A 0 • •

020D I>> value 1 1/100 F1 4000 • •

In
50 - 4000 •

10 - 4000 •

020E Trip time I>> 0 - 15000 1 10ms F1 0 • •

020F Torque (RCA) angle I^U>> 0 - 359 1 Degree F1 0 •

0210 Trip angle I^U>> 10 - 170 1 Degree F1 50 •

0211 I>>> operating mode 0-1-2-3 1 F24A 0 • •

0212 I>>> value 1 1/100 F1 4000 • •

In
50 - 4000 •

10 - 4000 •

0213 Trip time I>>> 0 - 15000 1 10ms F1 0 • •

0214 Torque (RCA) angle I^U>>> 0 - 359 1 Degree F1 0 •

0215 Trip angle I^U>>> 10 - 170 1 Degree F1 50 •

0216 Protection Ie> operating mode 0-1-2 1 F24A 0 • • •

50n/51n/67n

0217 Ie> value 0.002 - 1 Ien operating range 2 - 1000 1 1/1000 F1 1000 • • •
Ien

0.01 - 1 Ien operating range 10 -1000 5 1/1000 F1 10 • • •

Ien

0.1 - 25 Ien operating range 10- 2500 1 1/100 F1 2500 • • •

Ien

0218 Trip time type Ie> F3 0 • • •

0219 DMT Trip time Ie> 0 - 15000 1 10ms F1 0 • • •

021A TMS: Ie> trip time multiplier 25 - 1500 1 0.001 F1 25 • • •

021B K: Ie> trip time multiplier for RI type 100 -10000 5 0.001 F1 100 • • •
curve
 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 32/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

021C Ie> reset time type DMT or IDMT 0-1 1 F34 • • •

021D DMT Reset time Ie> 0 - 10000 1 10ms F1 100 • • •

021E RTMS: Ie> reset time multiplier 25 - 3200 1 0.001 F1 25 • • •

021F Ue> value 57 - 130V operating range 10 - 2600 1 1/10 V F1 10 • • •

220 - 480V operating range 40 - 7200 5 1/10 V F1 7200 • • •

0220 Torque (RCA) angle Ie^Ue> 0 - 359 1 Degree F1 0 • • •

0221 Trip angle Ie^Ue> 10 - 170 1 Degree F1 50 • • •

0222 Interlock Ie> 0-1 1 F24 0 • • •

0223 Ie>> operating mode 0-1-2 1 F24A 0 • • •

0224 Ie>> value 0.002-1 Ien operating range 2 - 1000 1 1/1000 F1 1000 • • •
Ien

0.01 - 8 Ien operating range 10 - 8000 5 1/1000 F1 8000 • • •

Ien

0.1 - 40 Ien operating range 50 - 4000 1 1/100 F1 100 • • •

Ien

0225 Trip time Ie>> 0 - 15000 1 10ms F1 0 • • •

0226 Ue>> value 57 - 130V operating range 10 - 2600 1 100mV F1 2600 • • •

220 - 480V operating range 40 - 9600 5 100mV F1 9600 • • •

0227 Torque (RCA) angle Ie^Ue>> 0 - 359 1 Degree F1 0 • • •

0228 Trip angle Ie^Ue>> 10 -170 1 Degree F1 10 • • •

0229 Ie>>> operating mode 0-1-2-3 1 F24A 0 • • •

022A Ie>>> value 0.002-1 Ien operating range 2 - 1000 1 1/1000 F1 1000 • • •
Ien

0.01 - 8 Ien operating range 10 - 8000 5 1/1000 F1 8000 • • •

Ien

0.1 - 40 Ien operating range 50 - 4000 1 1/100 F1 100 • • •

Ien

022B Trip time Ie>>> 0 -15000 1 10ms F1 0 • • •

022C Ue>>> value 57 - 130V operating range 10 - 2600 1 100mV F1 2600 • • •

220 - 480V operating range 40 - 9600 5 100mV F1 9600 • • •

022D Torque (RCA) angle (Ie^Ue)>>> 0 - 359 1 Degree F1 0 • • •

022E Trip angle (Ie^Ue)>>> 10 - 170 1 Degree F1 10 • • •

022F Protection 49 θ alarm operating mode 0-1 1 F24 0 • •

0230 θ alarm value 50 - 200 1 % F1 90 • •

0231 Iθ> (nominal current thermal) 10 - 320 1 1/100 F1 10 • •

0232 K 100 - 150 1 1/100 F1 105 • •

In

0233 Thermal overload time constant 1 - 200 1 Mn F1 1 • •

0234 θ trip operating mode 0-1 1 F24 0 • •

0235 θ trip value 50 - 200 1 % F1 100 • •

0236 Protection 37 I< operating mode 0-1 1 F24 0 • •

0237 I< value 10 - 100 1 1/100 F1 10 • •

In

0238 Trip time I< 0 - 15000 1 10ms F1 0 • •

0239 Protection 46 I2> operating mode 0-1 1 F24 0 • •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 33/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

023A I2> value 10 -2500 1 1/100 F1 2500 • •

In

023B Trip time type I2> F3 • •

023C DMT trip time I2> 0 -15000 1 10ms F1 0 • •

023D TMS: I2> trip time multiplier 25 - 1500 1 0.001 F1 25 • •

023E K: I2> trip time multiplier for RI type 100-10000 5 1/1000 F1 100 • •
curve

023F I2 reset time type: DMT or IDMT 0-1 1 F34 0 • •

0240 DMT reset time I2> 4 - 10000 1 10ms F1 4 • •

0241 RTMS: I2> reset time multiplier 25 -3200 1 0.001 F1 25 • •

0242 I2>> operating mode 0-1 1 F24 0 • •

0243 I2>> value 50 -4000 1 1/100 F1 4000 • •

In

0244 Trip time I2>> 0 - 15000 1 10ms F1 0 • •

0245 I2>>> operating mode 0-1 1 F24 0 • •

0246 I2>>> value 50 - 4000 1 1/100 F1 4000 • •

In

0247 Trip time I2>>> 0 - 15000 1 10ms F1 0 • •

0248 Protection 27 U< operating mode 0-1-2 1 F24B 0 •

0249 U< value 57 - 130V operating range 20 -1300 1 100mV F1 50 •

220 - 480V operating range 100 - 4800 5 100mV F1 200 •

024A Trip time U< 0 - 60000 1 10ms F1 0 •

024B U<< operating mode 0-1-2 1 F24B 0 •

024C U<< value 57 - 130V operating range 20 -1300 1 100mV F1 50 •

220 -. 480V 100 - 4800 5 100mV F1 200 •

024D Trip time U<< operating range 0 - 60000 1 10ms F1 0 •

024E Protection Pe> trip angle 0 - 359 1 F1 0 • • •

32n

024F 32n operating mode: Pe or IeCos 0-1 1 F24C 0 • • •

0250 Pe> operating mode 0-1 1 F24 0 • • •

0251 Pe> value 0.002-1 Ien / 57-130V 20 - 2000 2 10mW. F1 2000 • • •

operating range Ien

0.002-1 Ien / 220 - 480V 100 - 8000 10 10mW. F1 8000 • • •

operating range Ien

0.01 - 8 Ien / 57 - 130V 100 - 16000 10 10mW. F1 1600 • • •

0
operating range Ien

0.01 - 8 Ien / 220-480V 400 - 64000 50 10mW. F1 6400 • • •

0
operating range Ien

0.1 - 40 Ien / 57 - 130V 10 - 800 1 W.Ien F1 800 • • •

operating range

0.1 - 40 Ien / 220-480V 40 - 3200 5 W.Ien F1 3200 • • •

operating range

0252 Trip time type Pe> F3 0 • • •

0253 Trip time Pe> 0 - 15000 1 10ms F1 0 • • •

0254 TMS: Pe> trip time multiplier 25 - 1500 1 0.001 F1 25 • • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 34/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0255 K: Pe> trip time multiplier for RI type 100 -10000 5 0.001 F1 100 • • •
curve

0256 Reset time type Pe>: DMT or IDMT 0-1 1 F34 0 • • •

0257 DMT reset time Pe> 0 - 10000 1 10ms F1 4 • • •

0258 RTMS reset time Pe> 25 - 3200 1 1/1000 F1 25 • • •

0259 Pe>> operating mode 0 -1 1 F24 0 • • •

025A Pe>> value 0.002-1 Ien / 57-130V 20 - 2000 2 10mW. F1 2000 • • •

operating range Ien

0.002-1 Ien / 220 - 480V 100 - 8000 10 10mW. F1 8000 • • •

operating range Ien

0.01 - 8 Ien / 57 - 130V 100 - 16000 10 10mW. F1 1600 • • •

0
operating range Ien

0.01 - 8 Ien / 220-480V 400 - 64000 50 10mW. F1 6400 • • •

0
operating range Ien

0.1 - 40 Ien / 57 - 130V 10 - 800 1 W.Ien F1 800 • • •

operating range

0.1 - 40 Ien / 220-480V 40 - 3200 5 W.Ien F1 3200 • • •

operating range

025B Trip time Pe>> 0 - 15000 1 10ms F1 0 • • •

025C IeCos> operating mode 0 –1 1 F24 0 • • •

025D IeCos> value 0.002 - 1 Ien operating range 2 - 1000 1 1/1000 F1 1000 • • •
Ien

0.01 - 1 Ien operating range 10- 8000 5 1/1000 F1 8000 • • •

Ien

0.1 - 25 Ien operating range 10 - 2500 1 1/100 F1 2500 • • •

Ien

025E Trip time type IeCos> F3 0 • • •

025F DMT Trip time IeCos> 0 -15000 1 10ms F1 0 • • •

0260 TMS: IeCos> trip time multiplier 25 - 1500 1 0.001 F1 25 • • •

0261 K: IeCos> trip time multiplier for RI 100 -10000 5 0.001 F1 100 • • •
type curve

0262 Reset time type IeCos>: DMT or IDMT 0-1 1 F34 0 • • •

0263 DMT Reset time IeCos> 0 - 10000 1 10ms F1 4 • • •

0264 RTMS reset time IeCos> 25 - 3200 1 0.001 F1 25 • • •

0265 IeCos>> mode 0–1 1 F24 0 • • •

0266 IeCos>> value 0.002 - 1 Ien operating range 2 - 1000 1 1/1000 F1 1000 • • •
Ien

0.01 - 1 Ien operating range 10 - 8000 5 1/1000 F1 8000 • • •

Ien

0.1 - 25 Ien operating range 50 - 4000 1 1/100 F1 4000 • • •

Ien

0267 Trip time IeCos>> 0 - 15000 1 10ms F1 1 • • •

0268 Protection 59 U> operating mode 0-1-2 1 - F24B 0 •

0269 U> value 57 – 130V operating range 20 -2600 1 100mV F1 2600 •

220 – 480V operating range 100 -9600 5 100mV F1 7200 •

026A Trip time U> 0 - 60000 1 10ms F1 0 •

 Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 35/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

026B U>> operating mode 0 –1-2 1 F24B 0 •

026C U>> value 57 – 130V operating range 20 - 2600 1 100mV F1 2600 •

220 – 480V operating range 100 - 9600 1 100mV F1 9600 •

026D Trip time U>> 0 - 60000 1 10ms F1 0 •

026E Protection Ue>>>> operating mode 0-1 1 F24 0 •

59n

026F Ue>>>> value 57 – 130V operating range 10 - 2600 1 100mV F1 2600 •

220 – 480V operating range 50 - 9600 5 100mV F1 9600 •

0270 Trip time Ue>>>> 0 - 60000 1 10ms F1 0 •

0271 Recloser 79 Recloser info 0-1 1 F24 0 • •

0272 CB position active 0-1 1 F24 0 • •

0273–0274 Supervision window 1 -.60000 1 10ms F18A 1 • •

0275 External blocking input 0-1 1 F24 1 • •

0276 tAux1 cycle configuration 0 - 2222 1 F57 1111 • •

0277 tAux2 cycle configuration 0 - 2222 1 F57 1111 • •

0278 Dead time 1 1 - 30000 1 10ms F1 500 • •

0279 Dead time 2 1 - 30000 1 10ms F1 500 • •

027A–027B Dead time 3 1 - 60000 1 10ms F18A 500 • •

027C–027D Dead time 4 1 - 60000 1 10ms F18A 500 • •

027E–027F Reclaim time 2 - 60000 1 10ms F18A 500 • •

0280–0281 Inhibit time 2 - 60000 1 10ms F18A 500 • •

0282 Recloser cycles for phase faults 0-4 1 F1 4 • •

0283 Recloser cycles for earth faults 0-4 1 F1 4 • •

0284 Reset time DMT Reset time Ie>> 0 - 10000 1 10ms F1 4 • • •

67N

0285 DMT Reset time Ie>>> 0 - 10000 1 10ms F1 4 • • •

0286 Reset time DMT Reset time IeCos>> 0 - 10000 1 10ms F1 4 • • •

32N

0287 DMT Reset time Pe>> 0 - 10000 1 10ms F1 4 • • •

0288 Protection Trip time type I>> F3 0 • •

50/51/67

0289 TMS: I>> trip time multiplier 25 - 1500 1 0.001 F1 25 • •

028A K: I>> trip time multiplier for RI type 100 -10000 5 0.001 F1 100 • •
curve

028B Reset time type: DMT / IDMT 0-1 1 F34 0 • •

028C DMT reset time I>> 0 - 10000 1 10ms F1 4 • •

028D RTMS: I>> reset time multiplier 25 - 3200 1 0.001 F1 25 • •

028E Protection Trip time type Ie>> F3 0 • • •

50n/51n/67n

028F TMS: Ie>> trip time multiplier 25 - 1500 1 0.001 F1 25 • • •

0290 K: Ie>> trip time multiplier for type 100 - 10000 5 0.001 F1 100 • • •
curve

0291 Reset time type: DMT / IDMT 0-1 1 F34 0 • • •

0292 RTMS: Ie>> reset time multiplier 25 - 3200 1 0.001 F1 25 • • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 36/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

0293 Recloser 79 I> cycle configuration 0 - 2222 1 F57 1111 • •

0294 I>> cycle configuration 0 - 2222 1 F57 1111 • •

0295 I>>> cycle configuration 0 - 2222 1 F57 1111 • •

0296 Ie> cycle configuration 0 - 2222 1 F57 1111 • •

0297 Ie>> cycle configuration 0 - 2222 1 F57 1111 • •

0298 Ie>>> cycle configuration 0 - 2222 1 F57 1111 • •

0299 Pe/IeCos> cycle configuration 0 - 2222 1 F57 1111 • •

029A Pe/IeCos>> cycle configurat. 0 - 2222 1 F57 1111 • •

029B-029F Reserved

02A0 Active Power P> operating mode 0-1 1 F24 0 •

02A1 P> value 57-130V operating range 1-10000 1 W.In F1 10000 •

220V-480V operating range 4-40000 1 W.In F1 40000 •

02A2 Trip time tP> 0-15000 1 10ms F1 0 •

02A3 P> directional angle 0-359 1 Degree F1 0 •

02A4 P< operating mode 0-1 1 F24 0 •

02A5 P< triggering 57-130V operating range 1-10000 1 W x In F1 1 •

level
220V-480V operating range 4-40000 1 W x In F1 5 •

02A6 Trip time tP< 0-15000 1 10ms F1 0 •

02A7 P< directional angle 0-359 1 Degree F1 0

02A8 P>> operating mode 0-1 1 F24 0 •

02A9 P>> value 57-130V operating range 1-10000 1 W.In F1 1000 •

0

220V-480V operating range 4-40000 1 W.In F1 4000 •

0

02AA Trip time tP>> 0-15000 1 10mS F1 0 •

02AB P>> directional angle 0-359 1 Degree F1 0

02AC P<< operating mode 0-1 1 F24 0 •

02AD P<< triggering 57-130V operating range 1-10000 1 W x In F1 1 •

level
220V-480V operating range 4-40000 1 W x In F1 5 •

02AE Trip time tP<< 0-15000 1 10ms F1 0 •

02AF P<< directional angle 0-359 1 Degree F1 0

02B0 Frequency f1 operating mode 0-2 1 F68 0 •

02B1 f1 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

60 Hz nominal frequency 5510-6490 1 10mHz F1 6000 •

02B2 Trip time tf1 0-60000 1 10ms F1 0 •

02B3 f2 operating mode 0-2 1 F68 0 •

02B4 f2 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

60 Hz nominal frequency 5510-6490 1 10mHz F1 6000 •

02B5 Trip time tf2 0-60000 1 10ms F1 0 •

02B6 f3 operating mode 0-2 1 F68 0 •

02B7 f3 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

60 Hz nominal frequency 5510-6490 1 10mHz F1 6000 •

02B8 Trip time tf3 0-60000 1 10ms F1 0 •

 Communications P12y/EN CT/E95
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MiCOM P125/P126 & P127 Page 37/148

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

02B9 f4 operating mode 0-2 1 F68 0 •

02BA f4 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

5510-6490 ou
6000

02BB Trip time tf4 0-60000 1 10ms F1 0 •

02BC f5 operating mode 0-2 1 F68 0 •

02BD f5 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

60 Hz nominal frequency 5510-6490 1 10mHz F1 6000 •

02BE Trip time tf5 0-60000 1 10ms F1 0 •

02BF f6 operating mode 0-2 1 F68 0 •

02C0 f6 value 50 Hz nominal frequency 4510-5490 1 10mHz F1 5000 •

60 Hz nominal frequency 5510-6490 1 10mHz F1 6000 •

02C1 Trip time tf6 0-60000 1 10ms F1 0 •

02C2 Protection 37 Inhibition of I< on 52A 0-1 1 F24 0 • •

02C3 Inhibition of I< on U< 0-1 1 F24 0 •

02C4 U< value of 57 - 130V operating range 20-1300 1 100mV F1 50 •

inhibition I<
220 - 480V operating range 100-4800 5 100mV F1 200 •

02C5 Reactive Q> operating mode 0-1 1 F24 0 •

Power

02C6 Q> triggering 57-130V operating range 1-10000 1 W x In F1 1000 •

level 0

220V-480V operating range 4-40000 1 W x In F1 4000 •

0

02C7 Trip time tQ> 0-15000 1 10ms F1 0 •

02C8 Q> directional angle 0-359 1 Degree F1 0

02C9 Q< operating mode 0-1 1 F24 0 •

02CA Q< triggering 57-130V operating range 1-10000 1 W x In F1 1 •

level
220V-480V operating range 4-40000 1 W x In F1 5 •

02CB Trip time tQ< 0-15000 1 10ms F1 0

02CC Q< directional angle 0-359 1 Degree F1 0

02CD Q>> operating mode 0-1 1 F24 0

02CE Q>> triggering 57-130V operating range 1-10000 1 W x In F1 1000 •

level 0

220V-480V operating range 4-40000 1 W x In F1 4000 •

0

02CF Trip time tQ>> 0-15000 1 10mS F1 0

02D0 Q>> directional angle 0-359 1 Degree F1 0

02D1 Q<< operating mode 0-1 1 F24 0

02D2 Q<< triggering 57-130V operating range 1-10000 1 W x In F1 1 •

level
220V-480V operating range 4-40000 1 W x In F1 5 •

02D3 Trip time tQ<< 0-15000 1 10ms F1 0

02D4 Q<< directional angle 0-359 1 Degree F1 0

02D5 Recloser 79 Trips nb / time block ? 0-1 1 F24 0 • •

02D6 Openings number 2-100 1 F1 10 • •

 P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 38/148 MiCOM P125/P126 & P127

P125
P126
P127
Address Def.
Group Description Values range Step Unit Format
(hex) value

02D7 Time period 10 - 1440 1 minutes F1 60 • •

02D8-02D9 Dead Time tI> 5 - 60000 1 10 ms F18A 5 • •

02DA-02DB Dead Time tI>> 5 - 60000 1 10 ms F18A 5 • •

02DC-02DD Dead Time tI>>> 5 - 60000 1 10 ms F18A 5 • •

02DE-02DF Dead Time tIE> 5 - 60000 1 10 ms F18A 5 • •

02E0-02E1 Dead Time tIE>> 5 - 60000 1 10 ms F18A 5 • •

02E2-02E3 Dead Time tIE>>> 5 - 60000 1 10 ms F18A 5 • •

02E4 [50N/51N] Ie>>>> operating mode 0-1-2 1 F24A 0 •

Ie>>>>

02E5 Ie>>>> Threshold 10 to 4000 1 1/100 F1 100 •

IEn

02E6 Ie>>>> Trip time type F3 0 •

02E7 DMT Trip time tIe>>>> 0 to 15000 1 1/100 s F1 0 •

02E8 TMS: Ie>>>> trip time multiplier 25 to 1500 1 1/1000 F1 25 •

02E9 K: Ie>>>> trip time multiplier for RI 100 to 10000 5 1/1000 F1 100 •
curve

02EA Ie>>>> reset time type DMT or IDMT 0–1 1 F34 0 •

02EB DMT Reset time Ie>>>> 0 to 10000 1 1/100 s F1 0 •

02EC RTMS: Ie>>>> reset time multiplier 25 - 3200 1 0.001 F1 25 •

02ED Ue>>>> value 57 - 130V operating range 10 - 2600 1 1/10 V F1 1000 •

for Ie>>>>
220 - 480V operating range 40 - 7200 5 1/10 V F1 4000 •

02EE Torque (RCA) angle Ie^Ue>>>> 0 - 359 1 Degree F1 0 •

02EF Trip angle Ie^Ue>>>> 10 - 170 1 Degree F1 10 •

02F0 Not used

02F1 Protection 27 U< and U<< Inhibition by 52a 0–3 1 F86 0 •

02F2 [81R] FREQ. df/dt1 activation 0-1 1 F24 0 •

CHANGE OF
RATE

02F3 df/dt1 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02F4 df/dt2 activation 0-1 1 F24 0 •

02F5 df/dt2 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02F6 df/dt3 activation 0-1 1 F24 0 •

02F7 df/dt3 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02F8 df/dt4 activation 0-1 1 F24 0 •

02F9 df/dt4 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02FA df/dt5 activation 0-1 1 F24 0 •

02FB df/dt5 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02FC df/dt6 activation 0-1 1 F24 0 •

02FD df/dt6 threshold -100 - +100 1 0.1Hz/s F2 +10 •

02FE – 02FF Unused

Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 39/148

3.3.2 Page 3H - Setting group 2 remote parameters

Also mapped at page 26H.
The same as page 2H except addresses are 03XX instead of 02XX.
3.3.3 Page 24H - Setting group 1 remote parameters
Page 25h is reserved for future evolutions.
The same as page 2H except addresses are 24XX instead of 02XX.
3.3.4 Page 26H - Setting group 2 remote parameters
Page 27H is reserved for future evolutions.
The same as page 2H except addresses are 26XX instead of 02XX.
3.3.5 Page 28H - Setting group 3 remote parameters
Page 29H is reserved for future evolutions.
The same as page 2H except addresses are 28XX instead of 02XX.
3.3.6 Page 2AH - Setting group 4 remote parameters
Page 2BH is reserved for future evolutions.
The same as page 2H except addresses are 2AXX instead of 02XX.
3.3.7 Page 2CH - Setting group 5 remote parameters
Page 2DH is reserved for future evolutions.
The same as page 2H except addresses are 2CXX instead of 02XX.
3.3.8 Page 2EH - Setting group 6 remote parameters
Page 2FH is reserved for future evolutions.
The same as page 2H except addresses are 2EXX instead of 02XX.
3.3.9 Page 30H - Setting group 7 remote parameters
Page 31H is reserved for future evolutions.
The same as page 2H except addresses are 30XX instead of 02XX.
3.3.10 Page 32H - Setting group 8 remote parameters
Page 33H is reserved for future evolutions.
The same as page 2H except addresses are 32XX instead of 02XX.
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 40/148 MiCOM P125/P126 & P127

3.4 Boolean equations

3.4.1 Page 5H - Boolean equations parameters

Address Def.
Group Description Values range Step Unit Format
(hex) Value
0500 Bool Equations Equation A.00 operator 0-1 1 F70 0
0501 Equation A.00 operand 0 - 111 1 F72 0
0502 Equation A.01 operator 0-3 1 F71 0
0503 Equation A.01 operand 0 - 111 1 F72 0
0504 Equation A.02 operator 0-3 1 F71 0
0505 Equation A.02 operand 0 - 111 1 F72 0
0506 Equation A.03 operator 0-3 1 F71 0
0507 Equation A.03 operand 0 - 111 1 F72 0
0508 Equation A.04 operator 0-3 1 F71 0
0509 Equation A.04 operand 0 - 111 1 F72 0
050A Equation A.05 operator 0-3 1 F71 0
050B Equation A.05 operand 0 - 111 1 F72 0
050C Equation A.06 operator 0-3 1 F71 0
050D Equation A.06 operand 0 - 111 1 F72 0
050E Equation A.07 operator 0-3 1 F71 0
050F Equation A.07 operand 0 - 111 1 F72 0
0510 Equation A.08 operator 0-3 1 F71 0
0511 Equation A.08 operand 0 - 111 1 F72 0
0512 Equation A.09 operator 0-3 1 F71 0
0513 Equation A.09 operand 0 - 111 1 F72 0
0514 Equation A.10 operator 0-3 1 F71 0
0515 Equation A.10 operand 0 - 111 1 F72 0
0516 Equation A.11 operator 0-3 1 F71 0
0517 Equation A.11 operand 0 - 111 1 F72 0
0518 Equation A.12 operator 0-3 1 F71 0
0519 Equation A.12 operand 0 - 111 1 F72 0
051A Equation A.13 operator 0-3 1 F71 0
051B Equation A.13 operand 0 - 111 1 F72 0
051C Equation A.14 operator 0-3 1 F71 0
051D Equation A.14 operand 0 - 111 1 F72 0
051E Equation A.15 operator 0-3 1 F71 0
051F Equation A.15 operand 0 - 111 1 F72 0
0520 Equation B.00 operator 0-1 1 F70 0
0521 Equation B.00 operand 0 - 111 1 F72 0
0522 Equation B.01 operator 0-3 1 F71 0
0523 Equation B.01 operand 0 - 111 1 F72 0
0524 Equation B.02 operator 0-3 1 F71 0
0525 Equation B.02 operand 0 - 111 1 F72 0
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 41/148

Address Def.
Group Description Values range Step Unit Format
(hex) Value
0526 Equation B.03 operator 0-3 1 F71 0
0527 Equation B.03 operand 0 - 111 1 F72 0
0528 Equation B.04 operator 0-3 1 F71 0
0529 Equation B.04 operand 0 - 111 1 F72 0
052A Equation B.05 operator 0-3 1 F71 0
052B Equation B.05 operand 0 - 111 1 F72 0
052C Equation B.06 operator 0-3 1 F71 0
052D Equation B.06 operand 0 - 111 1 F72 0
052E Equation B.07 operator 0-3 1 F71 0
052F Equation B.07 operand 0 - 111 1 F72 0
0530 Equation B.08 operator 0-3 1 F71 0
0531 Equation B.08 operand 0 - 111 1 F72 0
0532 Equation B.09 operator 0-3 1 F71 0
0533 Equation B.09 operand 0 - 111 1 F72 0
0534 Equation B.10 operator 0-3 1 F71 0
0535 Equation B.10 operand 0 - 111 1 F72 0
0536 Equation B.11 operator 0-3 1 F71 0
0537 Equation B.11 operand 0 - 111 1 F72 0
0538 Equation B.12 operator 0-3 1 F71 0
0539 Equation B.12 operand 0 - 111 1 F72 0
053A Equation B.13 operator 0-3 1 F71 0
053B Equation B.13 operand 0 - 111 1 F72 0
053C Equation B.14 operator 0-3 1 F71 0
053D Equation B.14 operand 0 - 111 1 F72 0
053E Equation B.15 operator 0-3 1 F71 0
053F Equation B.15 operand 0 - 111 1 F72 0
0540 Equation C.00 operator 0-1 1 F70 0
0541 Equation C.00 operand 0 - 111 1 F72 0
0542 Equation C.01 operator 0-3 1 F71 0
0543 Equation C.01 operand 0 - 111 1 F72 0
0544 Equation C.02 operator 0-3 1 F71 0
0545 Equation C.02 operand 0 - 111 1 F72 0
0546 Equation C.03 operator 0-3 1 F71 0
0547 Equation C.03 operand 0 - 111 1 F72 0
0548 Equation C.04 operator 0-3 1 F71 0
0549 Equation C.04 operand 0 - 111 1 F72 0
054A Equation C.05 operator 0-3 1 F71 0
054B Equation C.05 operand 0 - 111 1 F72 0
054C Equation C.06 operator 0-3 1 F71 0
054D Equation C.06 operand 0 - 111 1 F72 0
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 42/148 MiCOM P125/P126 & P127

Address Def.
Group Description Values range Step Unit Format
(hex) Value
054E Equation C.07 operator 0-3 1 F71 0
054F Equation C.07 operand 0 - 111 1 F72 0
0550 Equation C.08 operator 0-3 1 F71 0
0551 Equation C.08 operand 0 - 111 1 F72 0
0552 Equation C.09 operator 0-3 1 F71 0
0553 Equation C.09 operand 0 - 111 1 F72 0
0554 Equation C.10 operator 0-3 1 F71 0
0555 Equation C.10 operand 0 - 111 1 F72 0
0556 Equation C.11 operator 0-3 1 F71 0
0557 Equation C.11 operand 0 - 111 1 F72 0
0558 Equation C.12 operator 0-3 1 F71 0
0559 Equation C.12 operand 0 - 111 1 F72 0
055A Equation C.13 operator 0-3 1 F71 0
055B Equation C.13 operand 0 - 111 1 F72 0
055C Equation C.14 operator 0-3 1 F71 0
055D Equation C.14 operand 0 - 111 1 F72 0
055E Equation C.15 operator 0-3 1 F71 0
055F Equation C.15 operand 0 - 111 1 F72 0
0560 Equation D.00 operator 0-1 1 F70 0
0561 Equation D.00 operand 0 - 111 1 F72 0
0562 Equation D.01 operator 0-3 1 F71 0
0563 Equation D.01 operand 0 - 111 1 F72 0
0564 Equation D.02 operator 0-3 1 F71 0
0565 Equation D.02 operand 0 - 111 1 F72 0
0566 Equation D.03 operator 0-3 1 F71 0
0567 Equation D.03 operand 0 - 111 1 F72 0
0568 Equation D.04 operator 0-3 1 F71 0
0569 Equation D.04 operand 0 - 111 1 F72 0
056A Equation D.05 operator 0-3 1 F71 0
056B Equation D.05 operand 0 - 111 1 F72 0
056C Equation D.06 operator 0-3 1 F71 0
056D Equation D.06 operand 0 - 111 1 F72 0
056E Equation D.07 operator 0-3 1 F71 0
056F Equation D.07 operand 0 - 111 1 F72 0
0570 Equation D.08 operator 0-3 1 F71 0
0571 Equation D.08 operand 0 - 111 1 F72 0
0572 Equation D.09 operator 0-3 1 F71 0
0573 Equation D.09 operand 0 - 111 1 F72 0
0574 Equation D.10 operator 0-3 1 F71 0
0575 Equation D.10 operand 0 - 111 1 F72 0
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 43/148

Address Def.
Group Description Values range Step Unit Format
(hex) Value
0576 Equation D.11 operator 0-3 1 F71 0
0577 Equation D.11 operand 0 - 111 1 F72 0
0578 Equation D.12 operator 0-3 1 F71 0
0579 Equation D.12 operand 0 - 111 1 F72 0
057A Equation D.13 operator 0-3 1 F71 0
057B Equation D.13 operand 0 - 111 1 F72 0
057C Equation D.14 operator 0-3 1 F71 0
057D Equation D.14 operand 0 - 111 1 F72 0
057E Equation D.15 operator 0-3 1 F71 0
057F Equation D.15 operand 0 - 111 1 F72 0
0580 Equation E.00 operator 0-1 1 F70 0
0581 Equation E.00 operand 0 - 111 1 F72 0
0582 Equation E.01 operator 0-3 1 F71 0
0583 Equation E.01 operand 0 - 111 1 F72 0
0584 Equation E.02 operator 0-3 1 F71 0
0585 Equation E.02 operand 0 - 111 1 F72 0
0586 Equation E.03 operator 0-3 1 F71 0
0587 Equation E.03 operand 0 - 111 1 F72 0
0588 Equation E.04 operator 0-3 1 F71 0
0589 Equation E.04 operand 0 - 111 1 F72 0
058A Equation E.05 operator 0-3 1 F71 0
058B Equation E.05 operand 0 - 111 1 F72 0
058C Equation E.06 operator 0-3 1 F71 0
058D Equation E.06 operand 0 - 111 1 F72 0
058E Equation E.07 operator 0-3 1 F71 0
058F Equation E.07 operand 0 - 111 1 F72 0
0590 Equation E.08 operator 0-3 1 F71 0
0591 Equation E.08 operand 0 - 111 1 F72 0
0592 Equation E.09 operator 0-3 1 F71 0
0593 Equation E.09 operand 0 - 111 1 F72 0
0594 Equation E.10 operator 0-3 1 F71 0
0595 Equation E.10 operand 0 - 111 1 F72 0
0596 Equation E.11 operator 0-3 1 F71 0
0597 Equation E.11 operand 0 - 111 1 F72 0
0598 Equation E.12 operator 0-3 1 F71 0
0599 Equation E.12 operand 0 - 111 1 F72 0
059A Equation E.13 operator 0-3 1 F71 0
059B Equation E.13 operand 0 - 111 1 F72 0
059C Equation E.14 operator 0-3 1 F71 0
059D Equation E.14 operand 0 - 111 1 F72 0
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 44/148 MiCOM P125/P126 & P127

Address Def.
Group Description Values range Step Unit Format
(hex) Value
059E Equation E.15 operator 0-3 1 F71 0
059F Equation E.15 operand 0 - 111 1 F72 0
05A0 Equation F.00 operator 0-1 1 F70 0
05A1 Equation F.00 operand 0 - 111 1 F72 0
05A2 Equation F.01 operator 0-3 1 F71 0
05A3 Equation F.01 operand 0 - 111 1 F72 0
05A4 Equation F.02 operator 0-3 1 F71 0
05A5 Equation F.02 operand 0 - 111 1 F72 0
05A6 Equation F.03 operator 0-3 1 F71 0
05A7 Equation F.03 operand 0 - 111 1 F72 0
05A8 Equation F.04 operator 0-3 1 F71 0
05A9 Equation F.04 operand 0 - 111 1 F72 0
05AA Equation F.05 operator 0-3 1 F71 0
05AB Equation F.05 operand 0 - 111 1 F72 0
05AC Equation F.06 operator 0-3 1 F71 0
05AD Equation F.06 operand 0 - 111 1 F72 0
05AE Equation F.07 operator 0-3 1 F71 0
05AF Equation F.07 operand 0 - 111 1 F72 0
05B0 Equation F.08 operator 0-3 1 F71 0
05B1 Equation F.08 operand 0 - 111 1 F72 0
05B2 Equation F.09 operator 0-3 1 F71 0
05B3 Equation F.09 operand 0 - 111 1 F72 0
05B4 Equation F.10 operator 0-3 1 F71 0
05B5 Equation F.10 operand 0 - 111 1 F72 0
05B6 Equation F.11 operator 0-3 1 F71 0
05B7 Equation F.11 operand 0 - 111 1 F72 0
05B8 Equation F.12 operator 0-3 1 F71 0
05B9 Equation F.12 operand 0 - 111 1 F72 0
05BA Equation F.13 operator 0-3 1 F71 0
05BB Equation F.13 operand 0 - 111 1 F72 0
05BC Equation F.14 operator 0-3 1 F71 0
05BD Equation F.14 operand 0 - 111 1 F72 0
05BE Equation F.15 operator 0-3 1 F71 0
05BF Equation F.15 operand 0 - 111 1 F72 0
05C0 Equation G.00 operator 0-1 1 F70 0
05C1 Equation G.00 operand 0 - 111 1 F72 0
05C2 Equation G.01 operator 0-3 1 F71 0
05C3 Equation G.01 operand 0 - 111 1 F72 0
05C4 Equation G.02 operator 0-3 1 F71 0
05C5 Equation G.02 operand 0 - 111 1 F72 0
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 45/148

Address Def.
Group Description Values range Step Unit Format
(hex) Value
05C6 Equation G.03 operator 0-3 1 F71 0
05C7 Equation G.03 operand 0 - 111 1 F72 0
05C8 Equation G.04 operator 0-3 1 F71 0
050C9 Equation G.04 operand 0 - 111 1 F72 0
05CA Equation G.05 operator 0-3 1 F71 0
05CB Equation G.05 operand 0 - 111 1 F72 0
05CC Equation G.06 operator 0-3 1 F71 0
05CD Equation G.06 operand 0 - 111 1 F72 0
05CE Equation G.07 operator 0-3 1 F71 0
05CF Equation G.07 operand 0 - 111 1 F72 0
05D0 Equation G.08 operator 0-3 1 F71 0
05D1 Equation G.08 operand 0 - 111 1 F72 0
05D2 Equation G.09 operator 0-3 1 F71 0
05D3 Equation G.09 operand 0 - 111 1 F72 0
05D4 Equation G.10 operator 0-3 1 F71 0
05D5 Equation G.10 operand 0 - 111 1 F72 0
05D6 Equation G.11 operator 0-3 1 F71 0
05D7 Equation G.11 operand 0 - 111 1 F72 0
05D8 Equation G.12 operator 0-3 1 F71 0
05D9 Equation G.12 operand 0 - 111 1 F72 0
05DA Equation G.13 operator 0-3 1 F71 0
05DB Equation G.13 operand 0 - 111 1 F72 0
05DC Equation G.14 operator 0-3 1 F71 0
05DD Equation G.14 operand 0 - 111 1 F72 0
05DE Equation G.15 operator 0-3 1 F71 0
05DF Equation G.15 operand 0 - 111 1 F72 0
05E0 Equation H.00 operator 0-1 1 F70 0
05E1 Equation H.00 operand 0 - 111 1 F72 0
05E2 Equation H.01 operator 0-3 1 F71 0
05E3 Equation H.01 operand 0 - 111 1 F72 0
05E4 Equation H.02 operator 0-3 1 F71 0
05E5 Equation H.02 operand 0 - 111 1 F72 0
05E6 Equation H.03 operator 0-3 1 F71 0
05E7 Equation H.03 operand 0 - 111 1 F72 0
05E8 Equation H.04 operator 0-3 1 F71 0
05E9 Equation H.04 operand 0 - 111 1 F72 0
05EA Equation H.05 operator 0-3 1 F71 0
05EB Equation H.05 operand 0 - 111 1 F72 0
05EC Equation H.06 operator 0-3 1 F71 0
05ED Equation H.06 operand 0 - 111 1 F72 0
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 46/148 MiCOM P125/P126 & P127

Address Def.
Group Description Values range Step Unit Format
(hex) Value
05EE Equation H.07 operator 0-3 1 F71 0
05EF Equation H.07 operand 0 - 111 1 F72 0
05F0 Equation H.08 operator 0-3 1 F71 0
05F1 Equation H.08 operand 0 - 111 1 F72 0
05F2 Equation H.09 operator 0-3 1 F71 0
05F3 Equation H.09 operand 0 - 111 1 F72 0
05F4 Equation H.10 operator 0-3 1 F71 0
05F5 Equation H.10 operand 0 - 111 1 F72 0
05F6 Equation H.11 operator 0-3 1 F71 0
05F7 Equation H.11 operand 0 - 111 1 F72 0
05F8 Equation H.12 operator 0-3 1 F71 0
05F9 Equation H.12 operand 0 - 111 1 F72 0
05FA Equation H.13 operator 0-3 1 F71 0
05FB Equation H.13 operand 0 - 111 1 F72 0
05FC Equation H.14 operator 0-3 1 F71 0
05FD Equation H.14 operand 0 - 111 1 F72 0
05FE Equation H.15 operator 0-3 1 F71 0
05FF Equation H.15 operand 0 - 111 1 F72 0
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 47/148

3.5 Remote controls, device status & time synchronisation

3.5.1 Page 4H - Remote controls

Address Def.
Group Description Values range Step Unit Format
(hex) Value
0400 Remote control Remote control word 1 0 -.65535 1 F9 0
0401 Calibration mode 0
0402 Remote control word 2 0 --511 1 F39 0
(single output command)
0403 Remote control word 3 0 – 65535 1 F9A 0
0404 Remote control word 4 0 – 65535 1 F9B 0
0405 Keyboard remote control Binary 1 F81 0

3.5.2 Page 7H - Device status

Address Def.
Group Description Values range Step Unit Format
(hex) Value
0700 Relays status 1 - F23 0

3.5.3 Page 8H - Time synchronisation

Time synchronisation: access only in writing or reading 4 words (function 16 or 3).
The time synchronisation format is based on 8 bytes (4 words).
Format (F52) is depending on address 012Fh.

Address Nb Mask
Timer Values range Unit
(hex) bytes (hex)
With private date format:
Year 0800 2 FFFF 1994-2093 Years
Month 0801 1 (Hi) FF 1 -12 Months
Day 1 (Lo) FF 1 - 31 Days
Hour 0802 1 (Hi) FF 0 - 23 Hours
Minute 1 (Lo) FF 0 - 59 Minutes
Milliseconds 0803 2 FFFF 0 - 59999 ms
With IEC 60870-5-103 format:
0800 1 (Hi)
Year 1 (Lo) 7F 94-99 (1994-1999) Years
0-93 (2000-2093)
Month 0801 1 (Hi) 0F 1 - 12 Months
Day of the week 1 (Lo) E0 1 – 7 (Monday – Sunday) Days
Day of the month 1 (Lo) 1F 1 - 31 Days
Season 0802 1 (Hi) 80 0 - 1 (summer – winter)
Hour 1 (Hi) 1F 0 - 23 Hours
Date validity 1 (Lo) 80 0 - 1 (valid – invalid)
Minute 1 (Lo) 3F 0 - 59 Minutes
Milliseconds 0803 2 FFFF 0 - 59999 ms
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 48/148 MiCOM P125/P126 & P127

3.6 Disturbance records

Pages 38h to 3Ch: mapping pages used to send a service request to select the record
number to be uploaded before uploading any disturbance record.
The answer following this request contain the following information:
1. Numbers of samples (pre and post time)
2. Phase CT ratio
3. Earth CT ratio
4. Internal phase and earth current ratios
5. Phase VT ratio
6. Earth VT ratio
7. Internal phase and earth voltage ratios
8. Number of the last disturbance mapping page
9. Number of samples in this last disturbance mapping page
Pages 9h to 21h: contain the disturbance data (25 pages)
A disturbance mapping page contains 250 words:
0900 to 09FAh: 250 disturbance data words
0A00 to 0AFAh: 250 disturbance data words
0B00 to 0BFAh: 250 disturbance data words
…
2100 to 21FAh: 250 disturbance data words
The disturbance data pages contain the sample of a single channel from a record.
Page 22h: contains the index of the disturbance
Page 38h to 3Ch: selection of the disturbance record and channel
Page 3Dh: a dedicated request allows to know the number of disturbance records stored.
3.6.1 Pages 9H to 21H - Disturbance record data
Disturbance record data (25 pages).
Writing access in words (function 03)
Each disturbance mapping page contains 250 words.

Addresses (hex) Contents

0900h to 09FAh 250 disturbance data words
0A00h to 0AFAh 250 disturbance data words
0B00h to 0BFAh 250 disturbance data words
0C00h to 0CFAh 250 disturbance data words
0D00h to 0DFAh 250 disturbance data words
0E00h to 0DFAh 250 disturbance data words
0F00h to 0FFAh 250 disturbance data words
1000h to 10FAh 250 disturbance data words
1100h to 11FAh 250 disturbance data words
1200h to 12FAh 250 disturbance data words
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 49/148

Addresses (hex) Contents

1300h to 13FAh 250 disturbance data words
1400h to 14FAh 250 disturbance data words
1500h to 15FAh 250 disturbance data words
1600h to 16FAh 250 disturbance data words
1700h to 17FAh 250 disturbance data words
1800h to 18FAh 250 disturbance data words
1900h to 19FAh 250 disturbance data words
1A00h to 1AFAh 250 disturbance data words
1B00h to 1BFAh 250 disturbance data words
1C00h to 1CFAh 250 disturbance data words
1D00h to 1DFAh 250 disturbance data words
1E00h to 1EFAh 250 disturbance data words
1F00h to 1FFAh 250 disturbance data words
2000h to 20FAh 250 disturbance data words
2100h to 21FAh 250 disturbance data words

NOTE: The disturbance data pages contain the values of one channel from
one given disturbance record.

3.6.1.1 Meaning of each channel value

See pages 38H to 3CH

− IA, IB, IC, Ie channels.

The values are signed 16 bits words equivalent to the ADC value.
Phase current values calculation formula

Line phase current value (primary value) = value x phase primary CT ratio x √2 / 800
Earth current values calculation formula
The formula depends of nominal earth current:
0.1 to 40 Ien range
Line earth current value (primary value) = value x earth primary CT ratio x √2 / 800
0.01 to 8 Ien range
Line earth current value (primary value) = value x earth primary CT ratio x √2 / 3277
0.002 to 1 Ien range
Line earth current value (primary value) = value x earth primary CT ratio x √2 / 32700

− UA, UB, UC/Ue channels.

The values are signed 16 bits words equivalent to the ADC value.
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 50/148 MiCOM P125/P126 & P127

Phase voltage values calculation formula

The formula depends of nominal phase voltage:
57 to 130 V range
Line phase voltage value (primary value) = value x (phase primary VT ratio / phase
secondary VT ratio) x √2 / 126
220 to 480 V range
Line phase voltage value (primary value) = value x √2 / 34
Earth voltage values calculation formula
The formula depends of nominal earth voltage:
57 to 130 V range
Line earth voltage value (primary value) = value x (earth primary VT ratio / earth secondary
VT ratio) x √2 / 126
220 to 480 V range
Line earth voltage value (primary value) = value x √2 / 34

− Frequency channel:
Time between two samples in microseconds

− Logical channels:
Logical channel 1 (if MODBUS or DNP3 on rear ports)

Logic channel Contents

Bit 0 Trip relay (RL1)
Bit 1 Output relay 2 (RL2)
Bit 2 Output relay 3 (RL3)
Bit 3 Output relay 4 (RL4)
Bit 4 Watch-Dog relay (RL0)
Bit 5 Output relay 5 (RL5)
Bit 6 Output relay 6 (RL6)
Bit 7 Output relay 7 (RL7)
Bit 8 Output relay 8 (RL8)
Bit 9 Logical input 1 (EL1)
Bit 10 Logical input 2 (EL2)
Bit 11 Logical input 3 (EL3)
Bit 12 Logical input 4 (EL4)
Bit 13 Logical input 5 (EL5)
Bit 14 Logical input 6 (EL6)
Bit 15 Logical input 7 (EL7)
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 51/148

Logical channel 2 (if MODBUS or DNP3 on rear ports)

Logic channel Contents

Bit 0 Logical input 8 (EL8)
Bit 1 Logical input 9 (EL9)
Bit 2 Logical input 10 (EL10)
Bit 3 Logical input 11 (EL11)
Bit 4 Logical input 12 (EL12)
Bit 5 Reserved (EL13)
Bit 6 Reserved (EL14)
Bit 7 Reserved (EL15)
Bit 8 Reserved (EL16)
Bit 9 Reserved
Bit 10 Reserved
Bit 11 Reserved
Bit 12 Reserved
Bit 13 Reserved
Bit 14 Reserved
Bit 15 Reserved

Logical channel 1 (if IEC870-5-103 on rear ports)

Logic channel Contents

Bit 0 General Start
Bit 1 CB Failure
Bit 2 General Trip
Bit 3 trip tI>
Bit 4 trip tI>> or trip tI>>>
Bit 5 trip tIe>
Bit 6 trip tIe>> or trip tIe>>> or trip
tIe>>>>
Bit 7 trip tPw>
Bit 8 trip tPw>>
Bit 9 Logical input 1 (EL1)
Bit 10 Logical input 2 (EL2)
Bit 11 Logical input 3 (EL3)
Bit 12 Logical input 4 (EL4)
Bit 13 Logical input 5 (EL5)
Bit 14 Logical input 6 (EL6)
Bit 15 Logical input 7 (EL7)
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 52/148 MiCOM P125/P126 & P127

Logical channel 2 (if IEC870-5-103 on rear ports)

Logic channel Contents

Bit 0 Logical input 8 (EL8)
Bit 1 Logical input 9 (EL9)
Bit 2 Logical input 10 (EL10)
Bit 3 Logical input 11 (EL11)
Bit 4 Logical input 12 (EL12)
Bit 5 Reserved (EL13)
Bit 6 Reserved (EL14)
Bit 7 Trip relay (RL1)
Bit 8 Output relay 2 (RL2)
Bit 9 Output relay 3 (RL3)
Bit 10 Output relay 4 (RL4)
Bit 11 Watch-Dog relay (RL0)
Bit 12 Output relay 5 (RL5)
Bit 13 Output relay 6 (RL6)
Bit 14 Output relay 7 (RL7)
Bit 15 Output relay 8 (RL8)

3.6.2 Page 22H - Disturbance record index frame

Disturbance record index frame
Reading access in word (function 03)

Addresses (hex) Contents

2200h Disturbance data index frame

Disturbance record index frame

Word Nr. Contents

1 Disturbance record number
2 Disturbance record finish date (second)
3 Disturbance record finish date (second)
4 Disturbance record finish date (millisecond)
5 Disturbance record finish date (millisecond)
6 Disturbance record starting condition:
1 Æ tripping command (RL1)
2 Æ instantaneous
3 Æ remote command
4 Æ logical input
7 Frequency at the post-time beginning
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 53/148

3.6.3 Pages 38H to 3CH - Disturbance record & channel selection

Selection of the disturbance record and channel (19 words are uploaded for each address
reading)
Access in word reading (function 03)

Address (hex) Disturbance record number Channel

3800h 1 IA
3801h 1 IB
3802h 1 IC
3803h 1 Ie
3804h 1 UA
3805h 1 UB
3806h 1 UC / Ue
3807h 1 Frequency
3808h 1 Logical infos 1
3809h 1 Logical infos 2
3900h 2 IA
3901h 2 IB
3902h 2 IC
3903h 2 Ie
3904h 2 UA
3905h 2 UB
3906h 2 UC / Ue
3907h 2 Frequency
3908h 2 Logical infos 1
3909h 2 Logical infos 2
3A00h 3 IA
3A01h 3 IB
3A02h 3 IC
3A03h 3 Ie
3A04h 3 UA
3A05h 3 UB
3A06h 3 UC / Ue
3A07h 3 Frequency
3A08h 3 Logical infos 1
3A09h 3 Logical infos 2
3B00h 4 IA
3B01h 4 IB
3B02h 4 IC
3B03h 4 Ie
3B04h 4 UA
3B05h 4 UB
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 54/148 MiCOM P125/P126 & P127

Address (hex) Disturbance record number Channel

3B06h 4 UC / Ue
3B07h 4 Frequency
3B08h 4 Logical infos 1
3B09h 4 Logical infos 2
3C00h 5 IA
3C01h 5 IB
3C02h 5 IC
3C03h 5 Ie
3C04h 5 UA
3C05h 5 UB
3C06h 5 UC / Ue
3C07h 5 Frequency
3C08h 5 Logical infos 1
3C09h 5 Logical infos 2

Word Nr. Contents

n° 1 Number of samples included in the mapping
n° 2 Sample number in pre-time
n° 3 Sample number in post-time
n° 4 Phase primary CT
n° 5 Phase secondary CT
n° 6 Earth primary CT
n° 7 Earth secondary CT
n° 8 Phase Internal CT ratio
n° 9 Earth Internal CT ratio
n° 10 Phase primary VT – byte low
n° 11 Phase primary VT – byte high
n° 12 Phase secondary VT
n° 13 Earth primary VT – byte low
n° 14 Earth primary VT – byte high
n° 15 Earth secondary VT
n° 16 Internal VT ratio – numerator: 100
n° 17 Internal VT ratio – denominator: 12600 or 3400
n° 18 Last mapping page
n° 19 Last mapping page words number

Calculation formula for phase current values

Line phase current value (primary value) = phase sampled value (e.g. adress 3800h, 3801h
or 3802h) * phase primary CT * (1 / internal phase ratio) * √2
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 55/148

Calculation formula for earth current values

Line earth current value (primary value) = earth sampled value (e.g. adress 3803h) * earth
primary CT ratio * (1 / internal earth ratio) * √2
Phase voltage values calculation formula
Line phase voltage value (primary value) = 100 * phase sampled value (e.g. address 3804h
or 3805h or 3806h if Uc) * (phase primary VT / phase secondary VT) * (100 / internal VT
denominator) * √2
Phase primary VT is expressed in 10 V: phase primary VT = 4 means 40 V.
Phase secondary VT is expressed in 0.1 V: phase secondary VT = 4 means 0.4 V.
Phase internal VT denominator = 12 600 in A range, and 3 400 in B range.
Earth voltage values calculation formula
Line earth voltage value (primary value) = earth sampled value (e.g. address 3806h if Ue) *
earth primary VT ratio / earth internal VT ratio * √2
Earth voltage value (primary value) = 100 * earth sampled value (e.g. address 3806h) *
(earth primary VT / earth secondary VT) * (100 / internal VT denominator) * √2
Earth primary VT is expressed in 10 V: earth primary VT = 4 means 40 V.
Earth secondary VT is expressed in 0.1 V: earth secondary VT = 4 means 0.4 V.
Earth internal VT denominator = 12 600 in A range, and 3 400 in B range.
3.6.4 Page 3DH - Number of disturbance records available
Number of disturbance records available
Access in word reading (function 03)

Address (hex) Contains

3D00h Number of disturbance records available

Words description:

Word Nr. Contents

1 Number of disturbance records available
2 Oldest disturbance record number (n)
PRIVATE FORMAT: 3 & 4 Oldest disturbance record date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 5 & 6 Oldest disturbance record date (milliseconds)
IEC FORMAT: 3 to 6 Oldest disturbance record date (see format of time synchronisation,
address 0800h)
7 Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logical input
8 Acknowledge
9 Disturbance record previous number (n+1)
PRIVATE FORMAT: 10 & 11 Oldest disturbance record date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 12 & 13 Oldest disturbance record date (milliseconds)
IEC FORMAT: 10 to 13 Previous disturbance record date (see format of time synchronisation,
address 0800h)
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 56/148 MiCOM P125/P126 & P127

Word Nr. Contents

14 Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logical input
15 Acknowledge
16 Disturbance record previous number (n+2)
PRIVATE FORMAT: 17 & 18 Oldest disturbance record date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 19 & 20 Oldest disturbance record date (milliseconds)
IEC FORMAT: 17 to 20 Previous disturbance record date (see format of time synchronisation,
address 0800h)
21 Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logical input
22 Acknowledge
23 Disturbance record previous number (n+3)
PRIVATE FORMAT: 24 & 25 Oldest disturbance record date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 26 & 27 Oldest disturbance record date (milliseconds)
IEC FORMAT: 24 to 27 Previous disturbance record date (see format of time synchronisation,
address 0800h)
28 Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logical input
29 Acknowledge
30 Disturbance record previous number (n+4)
PRIVATE FORMAT: 31 & 32 Oldest disturbance record date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 33 & 34 Oldest disturbance record date (milliseconds)
IEC FORMAT: 33 to 36 Previous disturbance record date (see format of time synchronisation,
address 0800h)
35 Disturbance record starting origin
1= trip relay (RL1)
2= instantaneous threshold
3= remote command
4= logical input
36 Acknowledge
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 57/148

3.7 Events records

To upload the events records two requests are allowed:
Page 35h: request to upload an event record without acknowledges of this event.
Used addresses:
3500h: EVENT 1
…
54Ah: EVENT 75
Page 36h: request to upload the non-acknowledged oldest stored event record.
Two modes are available for the acknowledgement: automatic acknowledgement or manual
acknowledgement
The mode depends of the state of bit 12 of remote control word (address 400 h).
If this bit is set, then the acknowledgement is manual else the acknowledgement is
automatic.
In automatic mode, the reading of the event acknowledges the event.
In manual mode, it is necessary to write a specific command to acknowledge the oldest
event
(set the bit 13 of control word addressed to 400 h)
3.7.1 Page 35H - Event record data
Event record data (9 words).
Reading access in word (function 03)
Addresses 3500h to 35F9h.

Word Nr. Contents

1 Event meaning (see table below)
2 MODBUS address
3 MODBUS associated value
4 Reserved
PRIVATE FORMAT: 5 & 6 Event date (number of seconds since 01/01/1994)
PRIVATE FORMAT: 7 & 8 Event date (millisecond)
IEC FORMAT: 5 to 8 Event date (see format of time synchronisation, address 0800h)
9 Acknowledgement:
0 = event non acknowledged
1 = event acknowledged
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 58/148 MiCOM P125/P126 & P127

Word n. 1 event meaning and relative codes

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
01 Control close (Remote, input, HMI) F9 013
02 Control trip (Remote, input, HMI) F9 013
03 Disturbance recording start F73
04 Trip output unlatch F9 013
05 Settings change Address
06 Remote thermal reset F9
07 Maintenance Mode F9↑↓ 0402 Auto
08 Control relay in maintenance mode F39↑↓ 013
09 U< F17↑↓ 70 Inhib & Self
10 U<< F17↑↓ 71 Inhib & Self
11 Pe/Iecos> F16↑↓ 72 Yes & Self
12 Pe/Iecos>> F16↑↓ 73 Yes & Self
13 I< F17↑↓ 21 Yes & Self
14 I2> F17↑↓ 7C Yes & Self
15 I2>> F17↑↓ 7D Yes & Self
16 I2>>> F17↑↓ 7E Yes & Self
17 θ alarm (Thermal overload) F37↑↓ 020 Yes
18 U> F17↑↓ 76 Yes & Self
19 U>> F17↑↓ 77 Yes & Self
20 Ue>>>> F16↑↓ 7A Yes & Self
21 I> F17↑↓ 14 Yes & Self
22 I>> F17↑↓ 15 Yes & Self
23 I>>> F17↑↓ 16 Yes & Self
24 Ie> F16↑↓ 17 Yes & Self
25 Ie>> F16↑↓ 18 Yes & Self
26 Ie>>> F16↑↓ 19 Yes & Self
27 U< trip F17↑↓ 70 Inhib
28 U<< trip F17↑↓ 71 Inhib
29 Pe/Iecos> trip F16↑↓ 72 Yes
30 Pe/Iecos>> trip F16↑↓ 73 Yes
31 I< trip F17↑↓ 21 Yes
32 I2> trip F17↑↓ 7C Yes
33 I2>> trip F17↑↓ 7D Yes
34 I2>>> trip F17↑↓ 7E Yes
35 θ trip (Thermal overload) F37↑↓ 20 Yes
36 U> trip F17↑↓ 76 Yes
37 U>> trip F17↑↓ 77 Yes
38 Ue>>>> trip F16↑↓ 7A Yes
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 59/148

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
39 Reserved
40 Reserved
41 Reserved
42 I> trip F17↑↓ 14 Yes
43 I>> trip F17↑↓ 15 Yes
44 I>>> trip F17↑↓ 16 Yes
45 Ie> trip F16↑↓ 17 Yes
46 Ie>> trip F16↑↓ 18 Yes
47 Ie>>> trip F16↑↓ 19 Yes
48 Trip SOTF F38↑↓ 23 Yes
49 X1 trip: t AUX3 F13 13
50 X1 trip: t AUX4 F13 13
51 Equ. Log. A trip F48↑↓ 7F Inhib
52 Equ. Log. B trip F48↑↓ 7F Inhib
53 Equ. Log. C trip F48↑↓ 7F Inhib
54 Equ. Log. D trip F48↑↓ 7F Inhib
55 Broken conductor F38↑↓ 23 Yes
56 t AUX1 trip F38↑↓ 23 Inhib
57 t AUX2 trip F38↑↓ 23 Inhib
58 CB Flt or SF6 low (by logical input) F20↑↓ 11 Auto
59 Working time F43↑↓ 28 Yes
60 Operation numbers F43↑↓ 28 Yes
61 Sum of switched square amps F43↑↓ 28 Yes
62 Trip circuit supervision F43↑↓ 28 Yes
63 Closing time F43↑↓ 28 Yes
64 Reclose successful F43↑↓ 28 Auto
65 Recloser final trip F43↑↓ 28
66 Recloser settings error F43↑↓ 28 Auto
67 Circuit Breaker Failure F38↑↓ 23 Yes
68 Selective scheme logic 1 (by logical input) F20↑↓ 11
69 Selective scheme logic 2 (by logical input) F20↑↓ 11
70 Blocking logic 1 (by logical input) F20↑↓ 11
71 Blocking logic 2 (by logical input) F20↑↓ 11
72 Setting group change F55 11
73 O/O (by logical input) F20↑↓ 11
74 F/O (by logical input) F20↑↓ 11
75 All alarms acknowledgement (by logical input) F20↑↓ 11
76 Cold load pick up F20↑↓ 11
77 Input logic state change F12↑↓ 10
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 60/148 MiCOM P125/P126 & P127

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
78 X1 trip: θ trip F13 13
79 X1 trip: t I> F13 13
80 X1 trip: t I>> F13 13
81 X1 trip: t I>>> F13 13
82 X1 trip: t Ie> F13 13
83 X1 trip: t Ie>> F13 13
84 X1 trip: t Ie>>> F13 13
85 X1 trip: t Pe/Iecos> F13 13
86 X1 trip: t Pe/Iecos>> F13 13
87 X1 trip: t U< F13 13
88 X1 trip: t U<< F13 13
89 X1 trip: t I< F13 13
90 X1 trip: t U> F13 13
91 X1 trip: t U>> F13 13
92 X1 trip: t I2> F13 13
93 X1 trip: t I2>> F13 13
94 X1 trip: t I2>>> F13 13
95 X1 trip: t Ue>>>> F13 13
96 X1 trip: Broken Conductor F13 13
97 X1 trip: Equ. Log. A F13 13
98 X1 trip: Equ. Log. B F13 13
99 X1 trip: Equ. Log. C F13 13
100 X1 trip: Equ. Log. D F13 13
101 X1 trip: t AUX1 F13 13
102 X1 trip: t AUX2 F13 13
103 Output relays command F39↑↓ 402
104 Front panel single alarm acknowledge
105 All alarms front panel acknowledgement
106 Single alarm remote acknowledgement
107 All alarms remote acknowledgement
108 Major material alarm F45↑↓ 0F Yes
109 Minor material alarm F45↑↓ 0F Yes
110 Operating Latched Relays status F27↑↓ 2E Auto
111 General “Start” protection (IEC 60870-5-103 F95↑↓ 0B
protocol)
112 Recloser in “Service” (IEC 60870-5-103 only) F43↑↓ 28
113 52a by recloser (IEC 60870-5-103 protocol) Cycle
114 Local parameter setting (password active) - ↑↓
(IEC 60870-5-103 protocol)
115 Start timer Breaker failure (by logical input) F20A↑↓ 0D
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 61/148

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
116 t AUX3 trip F38↑↓ 23 Inhib
117 t AUX4 trip F38↑↓ 23 Inhib
118 Manual Close (by logical input) F20A↑↓ 0D
119 X1 trip: SOTF F38↑↓ 23
120 Local Mode (by logical input) F20A↑↓ 0D
121 I>> Blocked F38A↑↓ 22
122 I>>> Blocked F38A↑↓ 22
123 VTS F38A↑↓ 22 Auto
124 V2> F38A↑↓ 22
125 V2>> F38A↑↓ 22
126 Recloser int locked F43↑↓ 28 Auto
127 Recloser in progress F43↑↓ 28
128 Synchronization F23
129 Inrush blocking F38A↑↓ 22
130 P> F38A↑↓ 22 Yes & Self
131 P>> F38A↑↓ 22 Yes & Self
132 P> trip F38A↑↓ 22 Yes
133 P>> trip F38A↑↓ 22 Yes
134 X1 trip: t P> F13 13
135 X1 trip: t P>> F13 13
136 f1 F67↑↓ B5 Yes & Self
137 f2 F67↑↓ B6 Yes & Self
138 f3 F67↑↓ B7 Yes & Self
139 f4 F67↑↓ B8 Yes & Self
140 f5 F67↑↓ B9 Yes & Self
141 f6 F67↑↓ BA Yes & Self
142 tf1 F67↑↓ B5 Yes
143 tf2 F67↑↓ B6 Yes
144 tf3 F67↑↓ B7 Yes
145 tf4 F67↑↓ B8 Yes
146 tf5 F67↑↓ B9 Yes
147 tf6 F67↑↓ BA Yes
148 F out F69↑↓ BB Auto
149 X1 trip: tf1 Trip F13 13
150 X1 trip: tf2 Trip F13 13
151 X1 trip: tf3 Trip F13 13
152 X1 trip: tf4 Trip F13 13
153 X1 trip: tf5 Trip F13 13
154 X1 trip: tf6 Trip F13 13
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 62/148 MiCOM P125/P126 & P127

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
155 Equ. Log. E trip F48↑↓ 7F Inhib
156 Equ. Log. F trip F48↑↓ 7F Inhib
157 Equ. Log. G trip F48↑↓ 7F Inhib
158 Equ. Log. H trip F48↑↓ 7F Inhib
159 X1 trip: Equ. Log. E F13 13
160 X1 trip: Equ. Log. F F13 13
161 X1 trip: Equ. Log. G F13 13
162 X1 trip: Equ. Log. H F13 13
163 Comm. IEC-103: Signals&Measurements F78 0668
blocking
164 Comm. IEC-103: Commands blocking F78 0668
165 t AUX5 trip F38B↑↓ 2F Inhib
166 t AUX6 trip F38B↑↓ 2F Inhib
167 t AUX7 trip F38B↑↓ 2F Inhib
168 t AUX8 trip F38B↑↓ 2F Inhib
169 t AUX9 trip F38B↑↓ 2F Inhib
170 t AUX A trip F38B↑↓ 2F Inhib
171 t AUX B trip F38B↑↓ 2F Inhib
172 t AUX C trip F38B↑↓ 2F Inhib
173 X1 trip: t AUX5 F13 13
174 X1 trip: t AUX6 F13 13
175 X1 trip: t AUX7 F13 13
176 X1 trip: t AUX8 F13 13
177 X1 trip: t AUX9 F13 13
178 X1 trip: t AUXA F13 13
179 X1 trip: t AUXB F13 13
180 X1 trip: t AUXC F13 13
181 Start Earth (for IEC-103)
182 Ie>>>> F16↑↓ 1A Yes & Self
183 Ie>>>> trip F16↑↓ 1A Yes
184 X1 trip: t Ie>>>> F13 13
185 Reset LEDs (by logical input) F20B↑↓ BE
186 CTS F38A↑↓ 24 Auto
187 df/dt1 F94↑↓ BF Yes
188 df/dt2 F94↑↓ BF Yes
189 df/dt3 F94↑↓ BF Yes
190 df/dt4 F94↑↓ BF Yes
191 df/dt5 F94↑↓ BF Yes
192 df/dt6 F94↑↓ BF Yes
193 X1 trip: df/dt1 Trip F13 13
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 63/148

Code MODBUS
Event meaning Format Alarm
(Dec) address (Hex)
194 X1 trip: df/dt2 Trip F13 13
195 X1 trip: df/dt3 Trip F13 13
196 X1 trip: df/dt4 Trip F13 13
197 X1 trip: df/dt5 Trip F13 13
198 X1 trip: df/dt6 Trip F13 13
199 Recloser ext locked F43↑↓ 28 Auto
200 P< F38A↑↓ 22 Yes & Self
201 P<< F38A↑↓ 22 Yes & Self
202 P< trip F38A↑↓ 22 Yes
203 P<< trip F38A↑↓ 22 Yes
204 X1 trip: t P< F13 13
205 X1 trip: t P<< F13 13
206 Q> F38B↑↓ 2F Yes & Self
207 Q>> F38B↑↓ 2F Yes & Self
208 Q> trip F38B↑↓ 2F Yes
209 Q>> trip F38B↑↓ 2F Yes
210 X1 trip: t Q> F13 13
211 X1 trip: t Q>> F13 13
212 Q< F38B↑↓ 2F Yes & Self
213 Q<< F38B↑↓ 2F Yes & Self
214 Q< trip F38B↑↓ 2F Yes
215 Q<< trip F38B↑↓ 2F Yes
216 X1 trip: t Q< F13 13
217 X1 trip: t Q<< F13 13
218 Comm order 1 F9A 0403
219 Comm order 2 F9A 0403
220 Comm order 3 F9A 0403
221 Comm order 4 F9A 0403
222 “General Trip” (IEC 60870-5-103 protocol) F95↑↓ 0B
223 Trip Phase A (IEC 60870-5-103 protocol) F17↑↓ 14/15/16 or
76/77 or 70/71
224 Trip Phase B (IEC 60870-5-103 protocol) F17↑↓ 14/15/16 or
76/77 or 70/71
225 Trip Phase C (IEC 60870-5-103 protocol) F17↑↓ 14/15/16 or
76/77 or 70/71
226 General reset command F9A 0403

NOTE: The double arrow ↑↓ means the event is generated on event

occurrence (↑) and on event disappearance (↓).
On event occurrence, the corresponding bit of the associated format
is set to « 1 ».
On event disappearance, the corresponding bit of the associated
format is set to « 0 ».
P12y/EN CT/E95 Communications
MODBUS DATABASE
Page 64/148 MiCOM P125/P126 & P127

ALARM: a front alarm associated with the event appears.

Details:
Yes = alarm must be acknowledged manually (front panel or communication)
Self = Self reset start protection alarms if trip occurs (setting address 014Eh)
Inhib = the alarm can be inhibited by setting (address 0600h and 0602h)
Auto = alarm is automatically acknowledged when the event disappears
3.7.2 Page 36H - Oldest event data
Oldest event data.
Reading access in word (function 03)

Address (hex) Contents

3600h Oldest event data

3.8 Fault records

Page 37h: Page dedicated to upload fault record
Used addresses:
3700h: FAULT 1
3701h: FAULT 2
…
3718h: FAULT 25
Page 3Eh: Request to upload the non-acknowledged oldest stored fault record.
Two modes are available for the acknowledgement: automatic acknowledgement or manual
acknowledgement
The mode depends of the state of bit 12 of remote control word (address 400 h).
If this bit is set, then the acknowledgement is manual else the acknowledgement is
automatic.
In automatic mode, the reading of the fault acknowledges automatically the event.
In manual mode, it is necessary to write a specific command to acknowledge the oldest fault.
(set the bit 14 of control word addressed to 400 h)
3.8.1 Page 37H - Fault record
Fault record value data
Reading access in word (function 03)

Address (hex) Contents

3700h Fault value record n°1
3701h Fault value record n°2
3702h Fault value record n°3
-
3718h Fault value record n°25
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Each record is made up of 24 words:

Word Nr. Contents

1 Fault number
PRIVATE FORMAT: 2 & 3 Fault date (number of seconds since 01/01/94)
PRIVATE FORMAT: 4 & 5 Fault date (milli-seconds)
IEC FORMAT: 2 to 5 Fault date (see format of time synchronisation, address
0800h)
6 Fault date (season)
0= winter
1= summer
2= undefined
7 Active setting group during the fault (F55)
8 Phase origin ( F90 )
9 Fault recording starting origin (see format F61)
10 & 11 Fault value (10: LS word; 11: MS word) (1)
12 Phase A current value (nominal value)
13 Phase B current value (nominal value)
14 Phase C current value (nominal value)
15 Earth current value (nominal value)
16 Phase A voltage value (nominal value)
17 Phase B voltage value (nominal value)
18 Phase C voltage value (nominal value)
19 Earth voltage value (nominal value)
20 Angle between phase A current and phase B-C voltage values
21 Angle between phase B current and phase C-A voltage values
22 Angle between phase C current and phase A-B voltage values
23 Angle between earth current and earth voltage values
24 Acknowledgement:
0 = fault not acknowledged
1 = fault acknowledged
(1) Fault value is a CAN value; it has to be processed according to the below formulas to
find corresponding primary value.
Phase current values calculation formula
Line phase current value (primary value) = value x phase primary CT ratio / 800
Earth current values calculation formula
The formula depends of nominal earth current:
0.1 to 40 Ien range
Line earth current value (primary value) = value x earth primary CT ratio / 800
0.01 to 8 Ien range
Line earth current value (primary value) = value x earth primary CT ratio / 3277
0.002 to 1 Ien range
Line earth current value (primary value) = value x earth primary CT ratio / 32700
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Phase voltage values calculation formula

The formula depends of nominal phase voltage:
57 to 130 V range
Line phase voltage value (primary value) = value x (phase primary VT ratio / phase
secondary VT ratio) / 63
220 to 480 V range
Line phase voltage value (primary value) = value / 17
Earth voltage values calculation formula
The formula depends of nominal earth voltage:
57 to 130 V range
Line earth voltage value (primary value) = value x (earth primary VT ratio / earth
secondary VT ratio) / 63
220 to 480 V range
Line earth voltage value (primary value) = value / 17
Phase power values calculation formula
The formula depends of nominal phase voltage:
57 to 130 V range
Line phase power value (primary value) = value x (phase primary CT ratio x (phase
primary VT ratio / phase secondary VT ratio)) / (800 x 63)
220 to 480 V range
Line phase power value (primary value) = value x phase primary CT ratio / (800 x 17)
Earth power values calculation formula
The formula depends of nominal earth current and voltage:
0.1 to 40 Ien range and 57 to 130 V range
Line earth power value (primary value) = value x (earth primary CT ratio x (phase
primary VT ratio / phase secondary VT ratio)) / (800 x 63)
0.1 to 40 Ien rangee and 220 to 480 V range
Line earth power value (primary value) = value x earth primary CT ratio / (800 x 17)
0.01 to 8 Ien range and 57 to 130 V range
Line earth power value (primary value) = value x (earth primary CT ratio x (phase
primary VT ratio / phase secondary VT ratio)) / (3277 x 63)
0.01 to 8 Ien rangee and 220 to 480 V range
Line earth power value (primary value) = value x earth primary CT ratio / (3277 x 17)
0.002 to 1 Ien range and 57 to 130 V range
Line earth power value (primary value) = value x (earth primary CT ratio x (phase
primary VT ratio / phase secondary VT ratio)) / (32700 x 63)
0.002 to 1 Ien rangee and 220 to 480 V range
Line earth power value (primary value) = value x earth primary CT ratio / (32700 x 17)
Frequency values calculation formula
Frequency value = 1000000 / value
df/dt values calculation formula
df/dt value = value / 1000
Communications P12y/EN CT/E95
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3.8.2 Page 3EH - Oldest fault record

Oldest fault record value data.
Access in word reading (function 03).

Address (hex) Contents

3E00h Oldest fault record
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3.9 Error counters

3.9.1 Page 5AH - Error counters
Error counters.
Access in word reading (function 03).

Address (hex) Contents

5A00h Error counters

Words description:

Word Nr. Contents

1 Number of errors in page 1
2 Last error address of page 1
3 Number of errors in page 2
4 Last error address of page 2
5 Number of errors in page 3
6 Last error address of page 3
7 Number of errors in calibration page
8 Last error address of calibration page
9 Number of data checksum errors
10 Number of calibration checksum errors
Communications P12y/EN CT/E95
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4. MAPPING FORMAT DESCRIPTION

Values are decimal except when differently specified.

CODE DESCRIPTION
F1 Unsigned integer: numerical data 0 to 65535
F2 Signed integer: numerical data -32768 to 32767
F3 Unsigned integer: trip / reset curves type (hex values)

0 : DMT
10 : IEC STI
11 : IEC SI
12 : IEC VI
13 : IEC EI
14 : IEC LTI
115 : C02
116 : IEEE MI
117 : CO8
118 : IEEE VI
119 : IEEE EI
1A : RECT
20 : RI
F4 Unsigned integer: UART Baud rate

0: 300
1: 600
2: 1200
3: 2400
4: 4800
5: 9600
6: 19200
7: 38400
F5 Unsigned integer: Modbus and DNP3 parity bit

0: none
1: even
2: odd
F6 Unsigned integer: conf. tripping on relay RL1, part 1

Bit 0: tI>
Bit 1: tI>>
Bit 2: tI>>>
Bit 3: tIe>
Bit 4: tIe>>
Bit 5: tIe>>>
Bit 6: tI<
Bit 7: θ trip
Bit 8: broken conductor trip
Bit 9: AUX 1 trip
Bit 10: AUX 2 trip
Bit 11: tI2>
Bit 12: tPe/Iecos>
Bit 13: tPe/Iecos>>
Bit 14: tUe>>>>
Bit 15: Control trip
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CODE DESCRIPTION
F6A Unsigned integer: conf. tripping on relay RL1, part 2

Bit 0: tU>
Bit 1: tU>>
Bit 2: tU<
Bit 3: tU<<
Bit 4: t Boolean equation A
Bit 5: t Boolean equation B
Bit 6: t Boolean equation C
Bit 7: t Boolean equation D
Bit 8: tI2>>
Bit 9: tI2>>>
Bit 10: tP >
Bit 11: tP >>
Bit 12: Reserved
Bit 13: AUX 3 trip
Bit 14: AUX 4 trip
Bit 15: SOTF/TOR
F6B Unsigned integer: conf. tripping on relay RL1, part 3

Bit 0: t Boolean equation E

Bit 1: t Boolean equation F
Bit 2: t Boolean equation G
Bit 3: t Boolean equation H
Bit 4: tF1
Bit 5: tF2
Bit 6: tF3
Bit 7: tF4
Bit 8: tF5
Bit 9: tF6
Bit 10: t Aux 5 ( P126-7 )
Bit 11: t Aux 6 ( P126-7 )
Bit 12: t Aux 7 ( P126-7 )
Bit 13: tIe>>>>
Bit 14: tP<
Bit 15: tP<<
F6C Unsigned integer: conf. tripping on relay RL1, part 4 ( P127 with logical inputs 8-12 )

Bit 0: t Aux 8
Bit 1: t Aux 9
Bit 2: t Aux A
Bit 3: t Aux B
Bit 4: t Aux C
Bit 5: df/dt1
Bit 6: df/dt2
Bit 7: df/dt3
Bit 8: df/dt4
Bit 9: df/dt5
Bit 10: df/dt6
Bit 11: tQ>
it 12: tQ>>
Bit 13: tQ<
Bit 14: tQ<<
Bit 15: Not used
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CODE DESCRIPTION
F7 Unsigned integer: U connection mode

0: 3Vpn
2: 2Vpp + Vr
4: 2Vpn + Vr
F8 Unsigned integer: blocking logic configuration, part 1

Bit 0: tI>+ tI>REV

Bit 1: tI>> + tI>>REV
Bit 2: tI>>> + tI>>>REV
Bit 3: tIe> + tIe>REV
Bit 4: tIe>> + tIe>>REV
Bit 5: tIe>>> + tIe>>>REV
Bit 6: tI<
Bit 7: θ trip
Bit 8: broken conductor trip
Bit 9: aux1 trip
Bit 10: aux2 trip
Bit 11: tI2>
Bit 12: tPe/Iecos>
Bit 13: tPe/Iecos>>
Bit 14: tUe>>>>
Bit 15: tIe>>>> + tIe>>>>REV
F8A Unsigned integer: blocking logic configuration, part 2

Bit 0: tU>
Bit 1: tU>>
Bit 2: tU<
Bit 3: tU<<
Bit 4: aux3 trip
Bit 5: aux4 trip
Bit 6: t P<
Bit 7: t P<<
Bit 8: tI2>>
Bit 9: tI2>>>
Bit 10: tP >
Bit 11: tP >>
Bit 12: t Q>
Bit 13: t Q>>
Bit 14: t Q<
Bit 15: t Q<<
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CODE DESCRIPTION
F8B Unsigned integer: blocking logic configuration, part 3

Bit 0: tF1
Bit 1: tF2
Bit 2: tF3
Bit 3: tF4
Bit 4: tF5
Bit 5: tF6
Bit 6: Reserve
Bit 7: Reserve
Bit 8: tAux 5
Bit 9: tAux 6
Bit 10: tAux 7
Bit 11: tAux 8
Bit 12: tAux 9
Bit 13: tAux A
Bit 14: tAux B
Bit 15: tAux C
F8C Unsigned integer: blocking logic configuration, part 4

Bit 0: df/dt1
Bit 1: df/dt2
Bit 2: df/dt3
Bit 3: df/dt4
Bit 4: df/dt5
Bit 5: df/dt6
Bit 6: reserve
Bit 7: reserve
Bit 8: reserve
Bit 9: reserve
Bit 10: reserve
Bit 11: reserve
Bit 12: reserve
Bit 13: reserve
Bit 14: reserve
Bit 15: reserve
F9 Unsigned integer: remote control 1

Bit 0: relays de-latching

Bit 1: 1st alarm acknowledge
Bit 2: all alarms acknowledge
Bit 3: remote tripping (CONTROL trip)
Bit 4: remote closing (CONTROL close)
Bit 5: settings group change
Bit 6: thermal state reset
Bit 7: max & average values reset
Bit 8: disturbance record remote start
Bit 9: maintenance mode
Bit 10: recloser counter reset
Bit 11: recloser reset
Bit 12: manual acknowledge mode
Bit 13: oldest event acknowledge
Bit 14: oldest fault acknowledge
Bit 15: reserved
Communications P12y/EN CT/E95
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CODE DESCRIPTION
F9A Previously F50 format
Unsigned integer: remote control word number 3
Bit 0: flag sync. harmonic earth current
Bit 1: LEDs reset
Bit 2: energy reset
Bit 3: oldest disturbance acknowledge
Bit 4: rolling average values reset
Bit 5: rolling max sub-period values reset
Bit 6: Communication Order 1
Bit 7: Communication Order 2
Bit 8: Communication Order 3
Bit 9: Communication Order 4
Bit 10: Not used
Bit 11: Not used
Bit 12: SA²n counter reset
Bit 13: Trips counter reset
Bit 14: General reset command
Bit 15: Not used
F9B Bit 0: Settings group 1 selection
Bit 1: Settings group 2 selection
Bit 2: Settings group 3 selection
Bit 3: Settings group 4 selection
Bit 4: Settings group 5 selection
Bit 5: Settings group 6 selection
Bit 6: Settings group 7 selection
Bit 7: Settings group 8 selection
F10 Unsigned integer: 2 ASCII characters

32 -127 = ASCII character1

32 - 127 = ASCII character 2
F11 Obsolete
F12 Unsigned integer: logic input status

Bit 0: logic input number 1

Bit 1: logic input number 2
Bit 2: logic input number 3
Bit 3 logic input number 4
Bit 4 logic input number 5
Bit 5 logic input number 6
Bit 6 logic input number 7
Bit 7: logic input number 8 (optional board)
Bit 8: logic input number 9 (optional board)
Bit 9: logic input number 10 (optional board)
Bit 10: logic input number 11 (optional board)
Bit 11: logic input number 12 (optional board)
Bits 12 to 15: Reserved
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CODE DESCRIPTION
F13 Unsigned integer: logic outputs status

Bit 0: logic output number RL1 (X1 tripping)

Bit 1: logic output number RL2
Bit 2: logic output number RL3
Bit 3: logic output number RL4
Bit 4: logic output number RL0 (Watch-Dog)
Bit 5: logic output number RL5
Bit 6: logic output number RL6
Bit 7: logic output number RL7
Bit 8: logic output number RL8
Bits 9 to 15: Reserved
F14 Unsigned integer: Rl2 - RL8 output configuration

Bit 0: logic output number RL2 selection

Bit 1: logic output number RL3 selection
Bit 2: logic output number RL4 selection
Bit 3: logic output number RL5 selection
Bit 4: logic output number RL6 selection
Bit 5: logic output number RL7 selection
Bit 6: logic output number RL8 selection
Bits 7 to 15: Reserved
F14A Unsigned integer: Rl2 - RL8 output configuration for CB & SOTF

Bit 0: logic output number RL2 selection (Recloser)

Bit 1: logic output number RL3 selection (Recloser)
Bit 2: logic output number RL4 selection (Recloser)
Bit 3: logic output number RL5 selection (Recloser)
Bit 4: logic output number RL6 selection (Recloser)
Bit 5: logic output number RL7 selection (Recloser)
Bit 6: logic output number RL8 selection (Recloser)
Bit 7: Reserved
Bit 8: logic output number RL2 selection (SOTF)
Bit 9: logic output number RL3 selection (SOTF)
Bit 10: logic output number RL4 selection (SOTF)
Bit 11: logic output number RL5 selection (SOTF)
Bit 12: logic output number RL6 selection (SOTF)
Bit 13: logic output number RL7 selection (SOTF)
Bit 14: logic output number RL8 selection (SOTF)
Bit 15: Reserved
Communications P12y/EN CT/E95
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CODE DESCRIPTION
F14B Unsigned integer: Rl2 - RL8 output configuration for tAux3 & tAux4

Bit 0: logic output number RL2 selection (tAux3)

Bit 1: logic output number RL3 selection (tAux3)
Bit 2: logic output number RL4 selection (tAux3)
Bit 3: logic output number RL5 selection (tAux3)
Bit 4: logic output number RL6 selection (tAux3)
Bit 5: logic output number RL7 selection (tAux3)
Bit 6: logic output number RL8 selection (tAux3)
Bit 7: Reserved
Bit 8: logic output number RL2 selection (tAux4)
Bit 9: logic output number RL3 selection (tAux4)
Bit 10: logic output number RL4 selection (tAux4)
Bit 11: logic output number RL5 selection (tAux4)
Bit 12: logic output number RL6 selection (tAux4)
Bit 13: logic output number RL7 selection (tAux4)
Bit 14: logic output number RL8 selection (tAux4)
Bit 15: Reserved
F14C Unsigned integer: Rl2 - RL8 output configuration for Control Trip & Close

Bit 0: logic output number RL2 selection (Control Trip)

Bit 1: logic output number RL3 selection (Control Trip)
Bit 2: logic output number RL4 selection (Control Trip)
Bit 3: logic output number RL5 selection (Control Trip)
Bit 4: logic output number RL6 selection (Control Trip)
Bit 5: logic output number RL7 selection (Control Trip)
Bit 6: logic output number RL8 selection (Control Trip)
Bit 7: Reserved
Bit 8: logic output number RL2 selection (Control Close)
Bit 9: logic output number RL3 selection (Control Close)
Bit 10: logic output number RL4 selection (Control Close)
Bit 11: logic output number RL5 selection (Control Close)
Bit 12: logic output number RL6 selection (Control Close)
Bit 13: logic output number RL7 selection (Control Close)
Bit 14: logic output number RL8 selection (Control Close)
Bit 15: Reserved
F14D Unsigned integer: Rl2 - RL8 output configuration for recloser trip final & locked

Bit 0: logic output number RL2 selection (recloser trip final)

Bit 1: logic output number RL3 selection (recloser trip final)
Bit 2: logic output number RL4 selection (recloser trip final)
Bit 3: logic output number RL5 selection (recloser trip final)
Bit 4: logic output number RL6 selection (recloser trip final)
Bit 5: logic output number RL7 selection (recloser trip final)
Bit 6: logic output number RL8 selection (recloser trip final)
Bit 7: Reserved
Bit 8: logic output number RL2 selection (recloser locked)
Bit 9: logic output number RL3 selection (recloser locked)
Bit 10: logic output number RL4 selection (recloser locked)
Bit 11: logic output number RL5 selection (recloser locked)
Bit 12: logic output number RL6 selection (recloser locked)
Bit 13: logic output number RL7 selection (recloser locked)
Bit 14: logic output number RL8 selection (recloser locked)
Bit 15: Reserved
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CODE DESCRIPTION
F15 Unsigned integer: digital inputs configuration, part 1

Bit 0: auxuliary relays de-latching command

Bit 1: O/O (52A)
Bit 2: F/O (52B)
Bit 3: CB Flt
Bit 4: aux 1
Bit 5: aux 2
Bit 6: blocking logic 1
Bit 7: blocking logic 2
Bit 8: disturbance start
Bit 9: cold load start
Bit 10: digital selection 1
Bit 11: digital selection 2
Bit 12: settings group change (configuration must be equal to INPUT)
Bit 13: recloser latched
Bit 14: reset thermal status
Bit 15: control tripping circuit
F15A Unsigned integer: digital inputs configuration, part 2

Bit 0: start Breaker Failure timer

Bit 1: maintenance mode
Bit 2: aux 3
Bit 3: aux 4
Bit 4: Reserved
Bit 5: SOTF (ex Manual close)
Bit 6: Local mode
Bit 7: Synchronization.
Bit 8: aux 5
Bit 9: aux 6
Bit A: aux 7
Bit B: aux 8
Bit C: aux 9
Bit D: aux A
Bit E: aux B
Bit F: aux C
F15B Unsigned integer: digital inputs configuration, part 3

Bit 0: Ctrl Trip

Bit 1: Ctrl Close
Bit 2: Led reset
Bit 3: Reserve 33
Bit 4: Reserve 34
Bit 5: Reserve 35
Bit 6: Reserve 36
Bit 7: Reserve 37
Bit 8: Reserve 38
Bit 9: Reserve 39
Bit A: Reserve 3A
Bit B: Reserve 3B
Bit C: Reserve 3C
Bit D: Reserve 3D
Bit E: Reserve 3E
Bit F: Reserve 3F
Communications P12y/EN CT/E95
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CODE DESCRIPTION
F16 Unsigned integer: earth threshold (current, voltage & power) information status

Bit 0: info limit exceeding

Bits 1 to 3: Reserved
Bit 4: Ie> Interlock activated
Bit 5: info start
Bit 6: info tripping
Bit 7: info tripping reverse mode
Bits 8 to 15: Reserved
F17 Unsigned integer: phase threshold (current, voltage & power) information status

Bit 0: info limit exceeding

Bit 1: phase A (or AB) trip
Bit 2: phase B (or BC) trip
Bit 3: phase C (or CA) trip
Bit 4: I> Interlock activated
Bit 5: info start
Bit 6: info tripping
Bit 7: info tripping reverse mode
Bits 8 to 15: Reserved
F18 Signed long integer: numeric data: -2E31 to (2E31 – 1)
F18A Unsigned long integer: numeric data: 0 to (2E32 -1)
F19 Unsigned integer: leds configuration mask, part 1

Bit 0: I>
Bit 1: tI>
Bit 2: I>>
Bit 3: tI>>
Bit 4: I>>>
Bit 5: tI>>>
Bit 6: Ie>
Bit 7: tIe>
Bit 8: Ie>>
Bit 9: tIe>>
Bit 10: Ie>>>
Bit 11: tIe>>>
Bit 12: θ trip
Bit 13: tI2>
Bit 14: broken conductor trip
Bit 15: breaker failure trip
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CODE DESCRIPTION
F19A Unsigned integer: leds configuration mask, part 2

Bit 0: digital input 1

Bit 1: digital input 2
Bit 2: digital input 3
Bit 3: digital input 4
Bit 4: digital input 5
Bit 5: recloser running
Bit 6: [79] Internally locked
Bit 7: tAux1
Bit 8: tAux2
Bit 9: Pe/Iecos>
Bit 10: tPe/Iecos>
Bit 11: Pe/Iecos>>
Bit 12: tPe/Iecos>>
Bit 13: Ue>>>>
Bit 14: tUe>>>>
Bit 15: SOTF
F19B Unsigned integer: leds configuration mask, part 3

Bit 0: U>
Bit 1: tU>
Bit 2: U>>
Bit 3: tU>>
Bit 4: U<
Bit 5: tU<
Bit 6: U<<
Bit 7: tU<<
Bit 8: tI2>>
Bit 9: tI<
Bit 10: tI> phase A
Bit 11: tI> phase B
Bit 12: tI> phase C
Bit 13: digital input 6
Bit 14: digital input 7
Bit 15: tI2>>>
F19C Unsigned integer: leds configuration mask, part 4

Bit 0: I2>
Bit 1: I2>>
Bit 2: I2>>>
Bit 3: I<
Bit 4: tAux3
Bit 5: tAux4
Bit 6: P >
Bit 7: tP >
Bit 8: P >>
Bit 9: tP >>
Bit 10: VTS
Bit 11: 51V
Bit 12: P<
Bit 13: tP<
Bit 14: P<<
Bit 15: tP<<
Communications P12y/EN CT/E95
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CODE DESCRIPTION
F19D Unsigned integer: leds configuration mask, part 5

Bit 0: f1
Bit 1: tf1
Bit 2: f2
Bit 3: tf2
Bit 4: f3
Bit 5: tf3
Bit 6: f4
Bit 7: tf4
Bit 8: f5
Bit 9: tf5
Bit 10: f6
Bit 11: tf6
Bit 12: out of frequency
Bit 13: Q >
Bit 14: tQ >
Bit 15: Q >>
F19E Unsigned integer: leds configuration mask, part 6

Bit 0: Equ. A
Bit 1: Equ. B
Bit 2: Equ. C
Bit 3: Equ. D
Bit 4: Equ. E
Bit 5: Equ. F
Bit 6: Equ. G
Bit 7: Equ. H
Bit 8: tAux 5 (P126-P127).
Bit 9: tAux 6 (P126-P127).
Bit 10: tAux 7 (P126-P127).
Bit 11: tQ>>
Bit 12: Q<
Bit 13: tQ<
Bit 14: Q<<
Bit 15: tQ<<
F19F Unsigned integer: leds configuration mask, part 7 (only with p127 optional board)

Bit 0: t Aux 8.
Bit 1: t Aux 9
Bit 2: t Aux A
Bit 3: t Aux B
Bit 4: t Aux C
Bit 5: reserve
Bit 6: reserve
Bit 7: reserve
Bit 8: digital input 8.
Bit 9: digital input 9.
Bit 10: digital input A.
Bit 11: digital input B.
Bit 12: digital input C
Bit 13: reserve
Bit 14: reserve
Bit 15: reserve
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CODE DESCRIPTION
F19G Unsigned integer: leds configuration mask, part 8

Bit 0: df/dt 1
Bit 1: df/dt 2
Bit 2: df/dt 3
Bit 3: df/dt 4
Bit 4: df/dt 5
Bit 5: df/dt 6
Bit 6: Ie>>>>
Bit 7: tle>>>>
Bit 8: CTS
Bit 9: [79] Ext locked
Bit 10: reserve
Bit 11: reserve
Bit 12: reserve
Bit 13: reserve
Bit 14: reserve
Bit 15: reserve
F20 Unsigned integer: logic inputs data status, part 1

Bit 0: logic selection 1

Bit 1: logic selection 2
Bit 2: relays de-latching
Bit 3: CB position (52a)
Bit 4: CB position (52b)
Bit 5: external CB failure
Bit 6: aux 1
Bit 7: aux 2
Bit 8: blocking logic 1
Bit 9: blocking logic 2
Bit 10: disturbance recording start
Bit 11: cold load start
Bit 12: settings group change
Bit 13: recloser locked
Bit 14: thermal status reset
Bit 15: trip circuit supervision
F20A Unsigned integer: logic inputs data status, part 2

Bit 0: start Breaker Failure timer

Bit 1: maintenance mode
Bit 2: aux 3
Bit 3: aux 4
Bit 4: Reserved
Bit 5: Manual close
Bit 6: Local mode
Bit 7: Synchro
Bit 8: aux 5
Bit 9: aux 6
Bit A: aux 7
Bit B: aux 8
Bit C: aux 9
Bit D: aux A
Bit E: aux B
Bit F: aux C
Communications P12y/EN CT/E95
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CODE DESCRIPTION
F20B Unsigned integer: logical inputs status, part 3

Bit 0: Ctrl Trip

Bit 1: Ctrl Close
Bit 2: LEDs Reset
Bit 3 to bit 15: Not used
F21 Unsigned integer: software version (Dec value) : 100 – 999 (XY)

X digit = Version number 10 – 99

Y digit = Revision number 0 (A) – 9 (J)
F22 Unsigned integer: internal logic data

Bit 0: RL1 trip relay status

Bits 1 to 15: Reserved
F23 Unsigned integer: machine status

Bit 0: major material alarm

Bit 1: minor material alarm
Bit 2: presence of a non-acknowledged event
Bit 3: synchronisation state
bit 4: presence of a non-acknowledged disturbance recording
Bit 5: presence of a non-acknowledged fault record
Bits 6 to 15: Reserved
F24 Unsigned integer: generic info operating mode

0: out of service / not active

1: in service / active
F24A Unsigned integer: 50/51/67 and 50N/51N/67N operating mode

0: NO
1: YES
2: DIR
3: PEAK
F24B Unsigned integer: threshold operating mode

0: NO
1: AND
2: OR
F24C Unsigned integer: 32N protection operating mode

0: Pe type mode seuil

1: IeCos type mode seuil
F25 Unsigned integer: 2 ASCII characters
F26 Unsigned integer: default display configuration

1: IA measurement display (True RMS)

2: IB measurement display (True RMS)
3: IC measurement display (True RMS)
4: IN measurement display (True RMS)
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CODE DESCRIPTION
F27 Unsigned integer: RL1 - RL8 output relays latch configuration and status

Bit 0: relay number 1 (RL1)

Bit 1: relay number 2 (RL2)
Bit 2: relay number 3 (RL3)
Bit 3: relay number 4 (RL4)
Bit 4: relay number 5 (RL5)
Bit 5: relay number 6 (RL6)
Bit 6: relay number 7 (RL7)
Bit 7: relay number 8 (RL8)
Bits 8 to15: Reserved
F28 Reserved
F29 Unsigned integer: Modbus and DNP3 stop bits number

0: one stop bit

1: two stop bits
F30 Unsigned integer: communication status (IEC 60870-5-103 protocol)

Bit 0: communication RS485 port 1 available if = 1

Bit 1: obsolete (previously IEC 60870-5-103 protocol private option)
Bit 2: communication RS232 available if = 1
Bit 3: communication RS485 port 2 available if = 1
F31 Unsigned integer: numbers of available disturbance records

0: no records available
1: one events record available
2: two events records available
3: three events records available
4: four events records available
5: five events records available
F31A Unsigned integer: numbers of default records to display

1: First record (the oldest)

…
25: Twenty fifth record (more recently)
F31B Unsigned integer: numbers of intantaneous records to display

1: First record (the oldest)

…
5: Fifth record (more recently)
F32 Unsigned integer: disturbance recording configuration

0: disturbance recording start condition on protection START

1: disturbance recording start condition on protection TRIPPING
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 83/148

CODE DESCRIPTION
F33 Unsigned integer: cold load start thresholds

Bit 0: tI>
Bit 1: tI>>
Bit 2: tI>>>
Bit 3: tIe>
Bit 4: tIe>>
Bit 5: tIe>>>
Bit 6: θ trip
Bit 7: tI2>
Bit 8: tI2>>
Bit 9: tI2>>>
Bit 10: tIe>>>>
Bit 11: Not used
Bit 12: Not used
Bit 13: Not used
Bit 14: Not used
Bit 15: Not used
F34 Unsigned integer: threshold reset timer type

0: DMT
1: IDMT
F35 Unsigned integer: disturbance recording status

0: no disturbance recording uploaded

1: disturbance recording upload running
F36 Unsigned integer: non acknowledged memorised alarms flags, part 1

Bit 0: Ie>
Bit 1: tIe>
Bit 2: Ie>>
Bit 3: tIe>>
Bit 4: Ie>>>
Bit 5: tIe>>>
Bit 6: tIe>REV
Bit 7: tIe>> REV
Bit 8: tIe>>>REV
Bit 9: thermal alarm (θ alarm)
Bit 10: thermal trip (θ trip)
Bit 11: broken conductor trip
Bit 12: breaker failure trip
Bit 13: Ie>>>>
Bit 14: AUX1 trip
Bit 15: AUX2 trip
P12y/EN CT/E95 Communications
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CODE DESCRIPTION
F36A Unsigned integer: non acknowledged memorised alarms flags, part 2

Bit 0: CB operating time overreach

Bit 1: CB operation number overreach
Bit 2: square Amps sum overreach
Bit 3: trip circuit supervision
Bit 4: CB closing time overreach
Bit 5: t Boolean Equation A
Bit 6: t Boolean Equation B
Bit 7: t Boolean Equation C
Bit 8: t Boolean Equation D
Bit 9: Pe/Iecos>
Bit 10: tPe/Iecos>
Bit 11: Pe/Iecos>>
Bit 12: tPe/Iecos>>
Bit 13: I2>
Bit 14: tI2>
Bit 15: SOTF
F36B Unsigned integer: non acknowledged memorised alarms flags part 3

Bit 0: U<
Bit 1: tU<
Bit 2: U<<
Bit 3: tU<<
Bit 4: U>
Bit 5: tU>
Bit 6: U>>
Bit 7: tU>>
Bit 8: Ue>>>>
Bit 9: tUe>>>>
Bit 10: recloser internally locked
Bit 11: recloser successful
Bit 12: I2>>
Bit 13: tI2>>
Bit 14: I2>>>
Bit 15: tI2>>>
F36C Unsigned integer: non acknowledged memorised alarms flags, part 4

Bit 0: AUX3 trip

Bit 1: AUX4 trip
Bit 2: I> (old format before release V6: address 001Ah bit 5)
Bit 3: tI> (old format before release V6: address 001Dh bit 6)
Bit 4: I>> (old format before release V6: address 001Bh bit 5)
Bit 5: tI>> (old format before release V6: address 001Eh bit 6)
Bit 6: I>>> (old format before release V6: address 001Ch bit 5)
Bit 7: tI>>> (old format before release V6: address 001Fh bit 6)
Bit 8: I< (old format before release V6: address 0024h bit 5)
Bit 9: tI< (old format before release V6: address 0024h bit 6)
Bit 10: VTS
Bit 11: P >
Bit 12: tP >
Bit 13: P >>
Bit 14: tP >>
Bit 15: tIe>>>>
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 85/148

CODE DESCRIPTION
F36D Unsigned integer: non acknowledged memorised alarms flags, part 5

Bit 0: f1
Bit 1: tf1
Bit 2: f2
Bit 3: tf2
Bit 4: f3
Bit 5: tf3
Bit 6: f4
Bit 7: tf4
Bit 8: f5
Bit 9: tf5
Bit 10: f6
Bit 11: tf6
Bit 12: t Boolean Equation E
Bit 13: t Boolean Equation F
Bit 14: t Boolean Equation G
Bit 15: t Boolean Equation H
F36E Unsigned integer: non acknowledged memorised alarms flags, part 6

Bit 0: AUX5 trip

Bit 1: AUX6 trip
Bit 2: AUX7 trip
Bit 3: AUX8 trip
Bit 4: AUX9 trip
Bit 5: AUXA trip
Bit 6: AUXB trip
Bit 7: AUXC trip
Bit 8: P<
Bit 9: tP<
Bit 10: P<<
Bit 11: tP<<
Bit 12: Q>
Bit 13: tQ>
Bit 14: Q>>
Bit 15: tQ>>
F36F Unsigned integer: non acknowledged memorised alarms flags, part 7

Bit 0: Q<
Bit 1: tQ<
Bit 2: Q<<
Bit 3: tQ<<
Bit 4: dfdt 1
Bit 5: dfdt 2
Bit 6: dfdt 3
Bit 7: dfdt 4
Bit 8: dfdt 5
Bit 9: dfdt 6
Bit 10: Recloser externally locked
Bit 11: Ctrl Trip
Bit 12: CTS
Bit 13: Not used
Bit 14: Not used
Bit 15: Not used
P12y/EN CT/E95 Communications
MODBUS DATABASE
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CODE DESCRIPTION
F37 Unsigned integer: thermal overload information

Bit 0: thermal overload alarm

Bit 1: thermal overload trip
Bits 2 to 15: Reserved
F38 Unsigned integer: accessory functions, part 1

Bit 0: SOTF running

Bit 1: CB failure
Bit 2: pole A opening
Bit 3: pole B opening
Bit 4: pole C opening
Bit 5: broken conductor
Bit 6: Aux 1 trip
Bit 7: Aux 2 trip
Bit 8: broken conductor time delay
Bit 9: CB failure time delay
Bit 10: cold load pick up temporization started
Bit 11: CB alarms or bits 0, 1, 4 of F43
Bit 12: Aux 3 trip
Bit 13: Aux 4 trip
Bit 14: Start SOTF
Bit 15: Trip SOTF
F38A Unsigned integer: accessory functions, part 2

Bit 0: I>> Blocked

Bit 1: I>>> Blocked
Bit 2: VTS
Bit 3: V2>
Bit 4: V2>>
Bit 5: P >
Bit 6: tP >
Bit 7: P >>
Bit 8: tP >>
Bit 9: Inrush blocking
Bit 10: CTS
Bit 11: P<
Bit 12: tP<
Bit 13: P<<
Bit 14: tP<<
Bit 15: CTS time delay
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 87/148

CODE DESCRIPTION
F38B Unsigned integer: accessory functions, part 3

Bit 0: Aux 5 trip

Bit 1: Aux 6 trip
Bit 2: Aux 7 trip
Bit 3: Aux 8 trip
Bit 4: Aux 9 trip
Bit 5: Aux A trip
Bit 6: Aux B trip
Bit 7: Aux C trip
Bit 8: Q>
Bit 9: tQ>
Bit 10: Q>>
Bit 11 tQ>>
Bit 12: Q<
Bit 13: tQ<
Bit 14: Q<<
Bit 15: tQ<<
F39 Unsigned integer: output relay remote word in maintenance mode

Bit 0: RL1 (trip)

Bit 1: RL2
Bit 2: RL3
Bit 3: RL0 (watch-dog)
Bit 4: RL4
Bit 5: RL5
Bit 6: RL6
Bit 7: RL7
Bit 8: RL8
Bits 9 to15: Reserved
F40 Unsigned integer: selective scheme logic configuration

Bit 0: tI>>
Bit 1: tI>>>
Bit 2: tIe>>
Bit 3: tIe>>>
Bit 4: tIe>>>>
Bits 5 to 15: Reserved
F41 Unsigned integer: remote communication configuration

0: front and rear MODBUS

1: front MODBUS rear IEC 60870-5-103
2: front MODBUS rear COURIER
3: front MODBUS rear DNP3
F42 Unsigned integer: max & average current + voltage time window selection (dec values)

5: 5 min
10: 10 min
15: 15 min
30: 30 min
60: 60 min
P12y/EN CT/E95 Communications
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CODE DESCRIPTION
F43 Unsigned integer

Bit 0: CB operating time overreach

Bit 1: CB operation number overreach
Bit 2: square Amps sum overreach
Bit 3: trip circuit supervision
Bit 4: CB closing time overreach
Bit 5: recloser internaly locked
Bit 6: recloser successful
Bit 7: recloser in progress
Bit 8: closing command issued from recloser cycle
Bit 9: recloser configuration error
Bit 10: recloser in service (IEC 60870-5-103 protocol)
Bits 11: recloser final trip
Bit 12: "CB operations number / time" overreach
Bit 13: Recloser external locked
Bit 14: Recloser reinitialized
Bit 15: Not used
F44 Reserved
F45 Unsigned integer: HW alarm relay status

Bit 0: Watch-Dog operating

Bit 1: communication failure
Bit 2: data failure
Bit 3: analogue failure
Bit 4: datation failure
Bit 5: calibration failure
Bit 6: record data failure
Bit 7: Reserved
Bit 8: Reserved
Bit 9: factory alarm (default factory configuration reloaded)
Bit 10: communication failure port2 (optional board)
Bits 11 to 15: Reserved
F46 Unsigned integer: Ie harmonic content extraction

Bit 0: calculation active

Bits 1 to 15: Reserved
F47 Unsigned integer: digital inputs operating mode

Bit x =
0 Æ active when de-energized
1 Æ active when energized;
Bit 0: input 1
Bit 1: input 2
Bit 2: input 3
Bit 3: input 4
Bit 4: input 5
Bit 5: input 6
Bit 6: input 7
Bit 7: input 8 (optional board)
Bit 8: input 9 (optional board)
Bit 9: input A (optional board)
Bit 10: input B (optional board)
Bit 11: input C (optional board)
Bits 12 to 15: Reserved
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 89/148

CODE DESCRIPTION
F48 Unsigned integer: Boolean Equation Status

Bit 0: Reserved
Bit 1: t Boolean Equation A
Bit 2: t Boolean Equation B
Bit 3: t Boolean Equation C
Bit 4: t Boolean Equation D
Bit 5: Temporisation A, B,- or H active
Bit 6: t Boolean Equation E
Bit 7: t Boolean Equation F
Bit 8: t Boolean Equation G
Bit 9: t Boolean Equation H
Bits 10 to 15: Reserved
F49 Unsigned integer: calibration status flag

0: calibration KO
1: calibration OK
F50 Has been replaced by F9A ( F50 is kept for compatibility reasons
F51 Unsigned integer: digital inputs signal type

0: DC
1: AC
F52 Unsigned integer: date and time format

0: internal format (see « page 8H» description)

1: IEC
F53 Unsigned integer: IEC 60870-5-103 and DNP3 communication speed (Baud)
INTERNAL USE ONLY

IEC 60870-5-103:
0: 9600
1: 19200

DNP3.0:
0: 1200
1: 2400
2: 4800
3: 9600
4: 19200
5: 38400
P12y/EN CT/E95 Communications
MODBUS DATABASE
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CODE DESCRIPTION
F54 Unsigned integer: Digital inputs configuration mode, part 1:

Bit x = 0 Æ level / 1Æ edge

Bit 0: logic selection 1; operating only on level; not configurable (0)
Bit 1: logic selection 2; operating only on level; not configurable (0)
Bit 2: relays de-latching; operating only on level; not configurable (0)
Bit 3: CB position (52a) ; operating only on level; not configurable (0)
Bit 4: CB position (52b) ; operating only on level; not configurable (0)
Bit 5: external CB failure; operating only on level; not configurable (0)
Bit 6: tAux 1; operating only on level; not configurable (0)
Bit 7: tAux 2; operating only on level; not configurable (0)
Bit 8: blocking logic 1; operating only on level; not configurable (0)
Bit 9: blocking logic 2; operating only on level; not configurable (0)
Bit 10: disturbance recording start; operating only on edge; not configurable (1)
Bit 11: cold load start; operating only on level; not configurable (0)
Bit 12: settings group change ; Attention: 0 Æ Input / 1Æ Menu
Bit 13: recloser locked; operating only on level; not configurable (0)
Bit 14: thermal status reset; operating only on edge; not configurable (1)
Bit 15: trip circuit supervision; operating only on level; not configurable (0)
F54A Unsigned integer: Digital inputs configuration mode, part2:

Bit x = 0 Æ level / 1Æ edge

Bit 0: start Breaker Failure timer; operating only on edge; not configurable (1)
Bit 1: maintenance mode; operating only on level; not configurable (0)
Bit 2: tAux 3; operating only on level; not configurable (0)
Bit 3: tAux 4; operating only on level; not configurable (0)
Bit 4: Reserved
Bit 5: Manual close; operating only on level; not configurable (0)
Bit 6: Local mode; operating only on level; not configurable (0)
Bit 7: Synchronisation; operating only on level; not configurable (0)
Bit 8: tAux 5
Bit 9: tAux 6
Bit 10: tAux 7
Bit 11: tAux 8
Bit 12: tAux 9
Bit 13: tAux A
Bit 14: tAux B
Bit 15: tAux C
F54B Unsigned integer: Digital inputs configuration mode, part3:

Bit x = 0 Æ level / 1Æ edge

Bit 0: Control trip(1)
Bit 1: Control close(1)
Bit 2: Leds reset(0)
Bits 3 to 15: Not used
F55 Unsigned integer: active group

Group change format ( unsigned integer )

0: toggle from group 1 to group 2
1 group 1
2 group 2
3 group 3
4 group 4
5 group 5
6 group 6
7 group 7
8 group 8
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 91/148

CODE DESCRIPTION
F56 Unsigned integer: Fail safe and inversion relays

bit x = 0: relay normally de-energized.

bit x = 1: relay normally energized.
bit 0: Fail safe logical output number RL1 (tripping)
bit 1: Fail safe logical output number RL2
bit 2: Inversion logical output number RL3
bit 3: Inversion logical output number RL4
bit 4: Inversion logical output number RL5
bit 5: Inversion logical output number RL6
bit 6: Inversion logical output number RL7
bit 7: Inversion logical output number RL8
bits 8 à 15: Reserved
F57 Unsigned integer: recloser cycles configuration

Bit 0: Cycle 1 configuration (trip and initialize the reclosure)

Bit 1: Cycle 1 configuration (block the tripping on cycle)
Bit 2, Bit 3: Reserved
Bit 4: Cycle 2 configuration (trip and initialize the reclosure)
Bit 5: Cycle 2 configuration (block the tripping on cycle)
Bit 6, Bit 7: Reserved
Bit 8: Cycle 3 configuration (trip and initialize the reclosure)
Bit 9: Cycle 3 configuration (block the tripping on cycle)
Bit 10, Bit 11: Reserved
Bit 12: Cycle 4 configuration (trip and initialize the reclosure)
Bit 13: Cycle 4 configuration (block the tripping on cycle)
Bit 14, Bit 15: Reserved
F58 Unsigned integer: Switch onto fault configuration

Bit 0: Start I>>

Bit 1: Start I>>>
Bits 2 to 14: Reserved
Bit 15: SOTF on/off
F59 Unsigned integer: 51V configuration

Bit 0: (U< OR V2>) & I>> ? yes/no

Bit 1: (U<< OR V2>>) & I>>> ? yes/no
Bits 3 to 15: Reserved
F60 Unsigned integer: VTS configuration

Bit 0: VTS Alarm ? yes/no

Bit 1: VTS Blocks 51V ? yes/no
Bit 2: VTS Blocks protections which use VT ? yes/no
Bits 3 to 15: Reserved
P12y/EN CT/E95 Communications
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CODE DESCRIPTION
F61 Unsigned integer: Information on the starting origin of the RL1 trip relay

01 - Remote X1 trip
02 - θ trip (Thermal overload)
03 - I> trip
04 - I>> trip
05 - I>>> trip
06 - Ie> trip
07 - Ie>> trip
08 - Ie>>> trip
09 - I< trip
10 - Broken conductor trip
11 - U< trip
12 - U<< trip
13 - Pe/Iecos> trip
14 - Pe/Iecos>> trip
15 - I2> trip
16 - I2>> trip
17 - I2>>> trip
18 - U> trip
19 - U>> trip
20 - Ue>>>> trip
21 - Aux 1 trip
22 - Aux 2 trip
23 - AND Logic equate A trip
24 - AND Logic equate B trip
25 - AND Logic equate C trip
26 - AND Logic equate D trip
27 - Aux 3 trip
28 - Aux 4 trip
29 - SOTF
30 - P >
31 - P >>
32 - f1
33 - f2
34 - f3
35 - f4
36 - f5
37 - f6
38 - AND Logic equate E trip
39 - AND Logic equate F trip
40 - AND Logic equate G trip
41 - AND Logic equate H trip
42 - t Aux 5 ( P126-7 )
43 - t Aux 6 ( P126-7 )
44 - t Aux 7 ( P126-7 )
45 - t Aux 8 ( P127 with logical inputs 8-12 )
46 - t Aux 9 ( P127 with logical inputs 8-12 )
47 - t Aux A ( P127 with logical inputs 8-12 )
48 - t Aux B ( P127 with logical inputs 8-12 )
49 - t Aux C ( P127 with logical inputs 8-12 )
50 - Ie>>>> trip
51 - P <
52 - P <<
53 - Q >
54 - Q >>
55 - Q <
56 - Q <<
... See next page
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 93/148

CODE DESCRIPTION
F61 Unsigned integer: Information on the starting origin of the RL1 trip relay
(following)
57 – df/dt1
58 – df/dt2
59 – df/dt3
60 – df/dt4
61 – df/dt5
62 – df/dt6
F62 Unsigned integer: LED status (bit = 0 if LED inactive)

Bit 0 - Trip LED

Bit 1 - Alarm LED
Bit 2 - Warning LED
Bit 3 - Healthy LED (always active)
Bit 4 - LED 5
Bit 5 - LED 6
Bit 6 - LED 7
Bit 7 - LED 8
F63 Unsigned integer: Language

00 - French
01 - English
02 - Spanish
03 - German
04 - Italian
05 - Russian
06 - Polish
07 - Portuguese
08 - Dutch
09 - American
10 - Czech
11 - Hungarian
12 - Greek
13 – Chinese
14 - Turkish
Other - Language by default (product code)
F64 Unsigned integer: Alarms inhibition part 1

Bit 0: Alarm tAux 1 inhibited

Bit 1: Alarm tAux 2 inhibited
Bit 2: Alarm tAux 3 inhibited
Bit 3: Alarm tAux 4 inhibited
Bit 4: Alarm tAux 5 inhibited
Bit 5: Alarm tAux 6 inhibited
Bit 6: Alarm tAux 7 inhibited
Bit 7: Alarm tAux 8 inhibited
Bit 8: Alarm tAux 9 inhibited
Bit 9: Alarm tAux A inhibited
Bit 10: Alarm tAux B inhibited
Bit 11: Alarm tAux C inhibited
Bit 12: Alarm Control Trip inhibited
Bit 13: Alarm [79] ext. lock. Inhibited
Bit 14: Alarm I< inhibited
Bit 15: Not used
P12y/EN CT/E95 Communications
MODBUS DATABASE
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CODE DESCRIPTION
F64A Unsigned integer: Alarms inhibition part 2

Bit 0: Alarm Boolean equation A inhibited

Bit 1: Alarm Boolean equation B inhibited
Bit 2: Alarm Boolean equation C inhibited
Bit 3: Alarm Boolean equation D inhibited
Bit 4: Alarm Boolean equation E inhibited
Bit 5: Alarm Boolean equation F inhibited
Bit 6: Alarm Boolean equation G inhibited
Bit 7: Alarm Boolean equation H inhibited
Bit 8: Alarm U< inhibited
Bit 9: Alarm U<< inhibited
Bit 10: Alarm U<<< inhibited (not used)
Bit 11: Alarm P< inhibited
Bit 12: Alarm P<< inhibited
Bit 13: Alarm Q< inhibited
Bit 14: Alarm Q<< inhibited
Bit 15: Not used
F64B Unsigned integer: Alarms inhibition part 3

Bit 0: F1 alarm inhibited

Bit 1: F2 alarm inhibited
Bit 2: F3 alarm inhibited
Bit 3: F4 alarm inhibited
Bit 4: F5 alarm inhibited
Bit 5: F6 alarm inhibited
Bits 6 to 15: Not used
F65 Unsigned integer: VTS conv. directional to non-dir

Bit 0: VTS I> non-Dir ? yes/no

Bit 1: VTS I>> non-Dir ? yes/no
Bit 2: VTS I>>> non-Dir ? yes/no
Bit 3: VTS Ie> non-Dir ? yes/no
Bit 4: VTS Ie>> non-Dir ? yes/no
Bit 5: VTS Ie>>> non-Dir ? yes/no
Bits 6 to 15: Reserved
F66 Unsigned integer: phase rotation

Value 0: Normal , A_B_C

Value 1: Reverse , A_C_B
F67 Unsigned integer: frequency protection

Bit 0: information first crossing threshold

Bit 1: information of starting (second crossing)
Bit 2: information of tripping
Bit 3 to 15: Reserved
F68 Unsigned integer: frequency operating mode

0: No
1: Protection under frequency 81<
2: Protection over frequency 81>
F69 Unsigned integer: frequency measurement status

Bit 0: F out
Bit 1: F out because of U min
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 95/148

CODE DESCRIPTION
F70 Unsigned integer: 1st Operator for Boolean equations

0: Nothing
1: NOT
F71 Unsigned integer: Other than 1st Operator for Boolean equations

0: OR
1: OR NOT
2: AND
3: AND NOT
F72 Unsigned integer: Operand for Boolean equations

0: NULL
1: I>
2: tI>
3: I>>
4: tI>>
5: I>>>
6: tI>>>
7: Ie>
8: tIe>
9: Ie>>
10: tIe>>
11: Ie>>>
12: tIe>>>
13: Pe/IeCos>
14: tPe/IeCos >
15: Pe/IeCos >>
16: tPe/IeCos >>
17: I2>
18: tI2>
19: I2>>
20: tI2>>
21: I2>>>
22: tI2>>>
23: Thermal alarm (Ith>)
24: Thermal tripping (Ith>>)
25: I<
26: tI<
27: U>
28: tU>
29: U>>
30: tU>>
31: U<
32: tU<
33: U<<
34: tU<<
35: Ue>>>>
36: tUe>>>>
37: Broken conductor
38: Tripping 79
39: tAux1
40: tAux2
41: tAux3
42: tAux4
43: P>
44: tP>
... See next page
P12y/EN CT/E95 Communications
MODBUS DATABASE
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CODE DESCRIPTION
F72 Unsigned integer: Operand for Boolean equations
(following)
45: P>>
46: tP>>
47: F1
48: tF1
49: F2
50: tF2
51: F3
52: tF3
53: F4
54: tF4
55: F5
56: tF5
57: F6
58: tF6
59: VTS
61: tAux 6 ( P126-P127 )
62: tAux 7 ( P126-P127 )
63: tAux 8 (P127 with logical inputs 8-12)
64: tAux 9 (P127 with logical inputs 8-12)
65: tAux A (P127 with logical inputs 8-12)
66: tAux B (P127 with logical inputs 8-12)
67: tAux C (P127 with logical inputs 8-12)
68: Input 1
69: Input 2
70: Input 3
71: Input 4
72: Input 5( P126-P127 )
73: Input 6( P126-P127 )
74: Input 7( P126-P127 )
75: Input 8 (P127 with Inputs 8-12)
76: Input 9 (P127 with Inputs 8-12)
77: Input A (P127 with Inputs 8-12)
78: Input B (P127 with Inputs 8-12)
79: Input C (P127 with Inputs 8-12)
80: Ie>>>>
81: tIe>>>>
82: [79] int. lock
83: [79] ext. lock
84: tEquation A
85: tEquation B
86: tEquation C
87: tEquation D
88: tEquation E
89: tEquation F
90: tEquation G
60: tAux 5 ( P126-P127 )
91: tEquation H
92: CB Fail
93: CTS
94: df/dt1
95: df/dt2
96: df/dt3
97: df/dt4
98: df/dt5
99: df/dt6
100: P<
... See next page
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 97/148

CODE DESCRIPTION
F72 Unsigned integer: Operand for Boolean equations
(following)
101: tP<
102: P<<
103: tP<<
104: Q>
105: tQ>
106: Q>>
107: tQ>>
108: Q<
109: tQ<
110: Q<<
111: tQ<<
F73 Unsigned integer: Source of the disturbance recording start

0: None
1: On trip protection
2: On instantaneous protection
3: On communication order
4: On logic input order
5: No disturbance
6: On HMI order
F74 Unsigned integer: Spontaneous event enabling for IEC870-5-103 communication

Bit 0: IEC only

Bit 1: Private
F75 Unsigned integer: Measurements transmission enabling for IEC870-5-103
communication ( 0 = transmission disabled , 1 = transmission enabled )

Bit 0: ASDU3.4 only

Bit 1: ASDU 9 only
Bit 2: Others
F76 Unsigned integer: Date-and-time synchronisation mode.

0: Automatic: with following priority, in decreasing order:

1/ IRIG-B if configured (Option)
2/ Logical input
3/ Communication rear port 1
4/ Communication rear port 2 (if option configured)
1: IRIG-B only (manual mode), if configured
2: Logical input only (manual mode),
3: Communication rear port 1 only (manual mode).
4: Communication rear port 2 only (manual mode), if option configured.
F77 Unsigned integer: IRIG-B mode (Signal type)

0: Logical.
1: Modulated.
F78 Unsigned integer: IEC870-5-103 communication blocking ( 0 = enabled ; 1 = blocked )

Bit 0: Signals and measurements

Bit 1: Commands
P12y/EN CT/E95 Communications
MODBUS DATABASE
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CODE DESCRIPTION
F79 Unsigned integer: Date-and-time synchronisation origin:

0: None
1: IRIG-B, if configured
2: Logical input, if configured
3: Communication rear port 1
4: Communication rear port 2, if option configured
F80 Unsigned integer: Optional board

bit 0: logical input 8 to 12 present

bit 1: IRIG-B + RS485_2 ( second rs485 rear port ) presents
F81 Unsigned integer: Keyboard remote control word.

Only one bit simultaneously. The bit active simulate a pressure on the key.

bit 0: CLEAR key

bit 1: ALARM key
bit 2: UP key
bit 3: RIGHT key
bit 4: ENTER key
bit 5: DOWN key
bit 6: LEFT key
bit 7:
bit 8:
bit 9:
bit 10:
bit 11:
bit 12:
bit 13:
bit 14:
bit 15: Dialog re-init (factory test reserved)
F82 SOTF parameters: Closing orders types for SOTF starting

Bit 0: Front port communication order

Bit 1: Rear port communication order
Bit 2: "Ctrl Close" logical input
Bit 3: "SOTF" logical input
Bit 4: Reclosing ordered by Autorecloser
Bit 5: Reclosing ordered by HMI
BIT 6: Rear port 2 (optional) communication order (P127 only)
Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 99/148

CODE DESCRIPTION
F83 Unsigned integer: Inrush blocking configuration

bit 0: I>
bit 1: I>>
bit 2: I>>>
bit 3: IE>
bit 4: IE>>
bit 5: IE>>>
bit 6: reserved
bit 7: reserved
bit 8: reserved
bit 9: reserved
bit 10: reserved
bit 11: I2>
bit 12: I2>>
bit 13: I2>>>
bit 14: IE>>>>
bit 15: reserved
F84 VT protection

0: V P-P
1: V P-N
F85 Phases and Earth labels

0: L1, L2, L3, N

1: A, B, C, o
2: R, S, T, E
F86 U< and U<< inhibition by 52a
Bit 0: U< inhibited
Bit 1: U<< inhibited
F87 Unsigned integer: Cold load start starting mode

Bit 0: Detection with CLPU input

Bit 1: Automatic detection
F88 IEEE 32 bits floating-point format
Default availlable range from + 3.2 E+38 to - 3.2 E+38
F89 IEEE 64 bits floating-point format
F90 Phase designation
0 = none
1 = phase A
2 = phase B
3 = phase C
4 = phases A-B
5 = phases B-C
6 = phases C-A
7 = phases A-B-C
8 = earth
F91 Measurement mode
1 Quadrant 1 P: direct Q: inverted
2 Quadrant 2 P: inverted Q: direct
3 Quadrant 3 P: inverted Q: inverted
default and 4 Quadrant 4 P: direct Q: direct
P12y/EN CT/E95 Communications
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CODE DESCRIPTION
F92 CTS Activation and CTS Mode (Futur use)
0: CTS inhibited
1: I2/I1
2: Null current
3: I Diff
4: I Earth
F93 IEC870-5-103 communication: GI selection
0: Basic GI
1: Advanced GI
F94 Unsigned integer: df/dt protection flags
Bit 0: df/dt1
Bit 1: df/dt2
Bit 2: df/dt3
Bit 3: df/dt4
Bit 4: df/dt5
Bit 5: df/dt6
F95 IEC870-5-103 communication: Info General Start / General Trip
Bit 0: General Start
Bit 1: General Trip
F96 F1 value except if less than 100 ( 1.00% )
In that case Td demand is equal to Iam Td demand ( modbus address 06D4 )
Communications P12y/EN CT/E95
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4.1 Disturbance record additional information

4.1.1 MODBUS request definition used for disturbance record
To upload a disturbance record, the following requests must be done in the exact given
order:
1. (optional): Send a request to know the number of disturbance records available.
2. (compulsory): Send a request with the record number and the channel number.
3. (compulsory): Send one or several requests to upload the disturbance record data.
It depends of the number of samples.
4. (compulsory): Send a request to upload the index frame.
4.1.2 Request to know the number of disturbance records

Slave number Function code Word address Word number CRC

Xx 03h 3Dh 00 00 24h xx xx

This request may generate an error message with the error code:
EVT_NOK(OF): No record available
NOTE: If there are less than 5 records available, the answer will contain zero
in non-used words.
4.1.3 Service requests
This request must be sent before uploading the disturbance record channel samples. It
allows knowing the record number and the channel number to upload.
It allows also knowing the number of samples in the channel.

Slave number Function code Word address Word number CRC

xx 03h Refer to mapping 00 13h xx xx

This request may generate an error message with two different error codes:
CODE_DEF_RAM(02): Failure
CODE_EVT_NOK(03): No disturbance record available
4.1.4 Disturbance record upload request

Slave number Function code Word address Word number CRC

xx 03h Refer to mapping 01 to 7Dh xx xx

This request may geberate an error message with two different error codes:
CODE_DEP_DATA(04): The required disturbance data number is greater than
the memorised number.
CODE_SERV_NOK(05): The service request for disturbance record and
channel number has not been sent.
4.1.5 Index frame upload request

Slave number Function code Word address Word number CRC

xx 03h 22h 00 00 07h xx xx

This request may generate an error message with an error code:

CODE_SERV_NOK(05): The service request for disturbance record and
channel number has not been sent.
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4.1.6 Request to retrieve the oldest non-acknowledge event

Two ways can be followed to retrieve an event record:

− Send a request to retrieve the oldest non-acknowledged event.

− Send a request to retrieve a dedicated event.

Slave number Function code Word address Word number CRC

xx 03h 36h 00 00 09h xx............xx

This event request may generate an error message with the error code:
EVT_EN_COURS_ECRIT (5): An event is being written into the saved RAM.
NOTE: On event retrieval, two possibilities exist regarding the event record
acknowledgement:
− Automatic event record acknowledgement on event retrieval:

− Bit12 of the remote order frame (format F9 – mapping address

0400h) shall be set to 0. On event retrieval, this event record is
acknowledged.

− Non automatic event record acknowledgement on event retrieval:

− Bit12 of the remote order frame (format F9 – mapping address

0400h) shall be set to 1. On event retrieval, this event record is
not acknowledged.

− To acknowledge this event, another remote order shall be sent

to the relay. Bit 13 of this frame (format F9 – mapping address
0400h) shall be set to 1.
4.1.7 Request to retrieve a dedicated event

Slave number Function code Word address Word number CRC

Xx 03h Refer to mapping 00 09h xx............xx

This event request may generate an error message with the error code:
EVT_EN_COURS_ECRIT (5): An event is being written into the saved RAM.
NOTE: This event retrieval does not acknowledge this event.
4.1.8 Modbus request definition used to retrieve the fault records
Two ways can be followed to retrieve a fault record:

− Send a request to retrieve the oldest non-acknowledge fault record.

− Send a request to retrieve a dedicated fault record.

Communications P12y/EN CT/E95
MODBUS DATABASE
MiCOM P125/P126 & P127 Page 103/148

4.1.8.1 Request to retrieve the oldest non-acknowledge fault record

Slave number Function code Word address Word number CRC

Xx 03h 3Eh 00 00 18h xx............xx

NOTE: On fault retrieval, two possibilities exist regarding the fault record
acknowledgement:
a) Automatic fault record acknowledgement on event retrieval.
Bit12 of the remote order frame (format F9 – mapping address
0400h) shall be set to 0. On fault retrieval, this fault record is
acknowledged.
b) Non automatic fault record acknowledgement on fault retrieval:
Bit12 of the remote order frame (format F9 – mapping address
0400h) shall be set to 1. On fault retrieval, this fault record is not
acknowledged.
To acknowledge this fault, another remote order shall be sent to
the relay. Bit 14 of this frame (format F9 – mapping address
0400h) shall be set to 1.
4.1.8.2 Request to retrieve a dedicated fault record

Slave number Function code Word address Word number CRC

Xx 03h Refer to mapping 00 18h xx............xx

NOTE: This fault value retrieval does not acknowledge this fault record.
Communications P12y/EN CT/E95
IEC 60870-5-103 DATABASE
MiCOM P125/P126 & P127 Page 105/148

IEC 60870-5-103
DATABASE
MiCOM P125-P126 – V12
P127 – V13.A
P12y/EN CT/E95 Communications
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BLANK PAGE
Communications P12y/EN CT/E95
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CONTENTS

1. IEC 60870-5-103 PROTOCOL 109

1.1 General information 109
1.2 Spontaneous messages 109
1.2.1 Time Tagged Message 109
1.3 System state 115
1.4 Processed commands 120
1.4.1 System commands 120
1.4.2 General commands 120
1.5 Relay reinitialisation 121
1.6 Cyclic Messages 122
1.7 Disturbance record extraction 123
1.8 Fault data record extraction 126
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BLANK PAGE
Communications P12y/EN CT/E95
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MiCOM P125/P126 & P127 Page 109/148

1. IEC 60870-5-103 PROTOCOL

1.1 General information
Messages representation is expressed with the associated:

− INFORMATION NUMBER: INF

− ASDU TYPE: TYP

− CAUSE OF TRANSMISSION: COT

− FUNCTION NUMBER: FUN

1.2 Spontaneous messages
These messages include a sub-assembly of the events, which are generated on the relay.
The messages considered are concerning highest priority events.
An event is always generated on the rising edge of the information; some can be generated
also on falling edge.
In the list below, events generated only on rising edge will be tagged with a ‘*’.
1.2.1 Time Tagged Message
Two types of ASDU can be generated for events:

− ASDU 1: time-tagged message

− ASDU 2: time-tagged message with relative time

In the following list of processed events, FUNCTION NUMBERS (FUN) 160 and 161 are
used for Public range, respectively for current and voltage protections data, and FUNCTION
NUMBERS (FUN) 168 and 169 are used for Private range, respectively for current and
voltage protections data.
Status indications (monitor direction):
P127 + P126 + P125

− LEDS reset: FUN<160>;INF <19>; TYP <1>; COT<1>,*

− First alarm acknowledge: FUN<168>;INF <53>; TYP <1>; COT<1>,*

− All alarms acknowledge: FUN<168>;INF <52>; TYP <1>; COT<1>,*

− Signals&measurements
blocking active: FUN<160>;INF <20>; TYP <1>; COT<1> ↑↓

− Commands blocking active: FUN<168>;INF <151>; TYP <1>; COT<1> ↑↓

− Local parameter Setting active: FUN<160>;INF <22>; TYP <1>; COT<1> ↑↓

− Setting group number 1 active: FUN<160>;INF <23>; TYP <1>; COT<1> ↑↓

− Setting group number 2 active: FUN<160>;INF <24>; TYP <1>; COT<1> ↑↓

− Auxiliary input 1: FUN<160>;INF <27>; TYP <1>; COT<1> ↑↓

− Auxiliary input 2: FUN<160>;INF <28>; TYP <1>; COT<1> ↑↓

− Auxiliary input 3: FUN<160>;INF <29>; TYP <1>; COT<1> ↑↓

− Auxiliary input 4: FUN<160>;INF <30>; TYP <1>; COT<1> ↑↓

− Logical input 1: FUN<168>;INF <160>; TYP <1>; COT<1> ↑↓

− Logical input 2: FUN<168>;INF <161>; TYP <1>; COT<1> ↑↓

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− Logical input 3: FUN<168>;INF <162>; TYP <1>; COT<1> ↑↓

− Logical input 4: FUN<168>;INF <163>; TYP <1>; COT<1> ↑↓

− Logical output 1: FUN<168>;INF <176>; TYP <1>; COT<1> ↑↓

− Logical output 2: FUN<168>;INF <177>; TYP <1>; COT<1> ↑↓

− Logical output 3: FUN<168>;INF <178>; TYP <1>; COT<1> ↑↓

− Logical output 4: FUN<168>;INF <179>; TYP <1>; COT<1> ↑↓

− Watch Dog: FUN<168>;INF <180>; TYP <1>; COT<1> ↑↓

− Logical output 5: FUN<168>;INF <181>; TYP <1>; COT<1> ↑↓

− Logical output 6: FUN<168>;INF <182>; TYP <1>; COT<1> ↑↓

− Time synchronisation: FUN<168>;INF <226>; TYP <1>; COT<1> *

− Logical selectivity 1: FUN<168>;INF <28>; TYP <1>; COT<1> ↑↓

− Logical selectivity 2: FUN<168>;INF <29>; TYP <1>; COT<1> ↑↓

− Logical blocking 1: FUN<168>;INF <30>; TYP <1>; COT<1> ↑↓

− Logical blocking 2: FUN<168>;INF <31>; TYP <1>; COT<1> ↑↓

− Latch relays: FUN<168>;INF <230>; TYP <1>; COT<1> *

− Unlock relays: FUN<168>;INF<231>; TYP<1>; COT<1> *

− General Reset: FUN<168>;INF<232>; TYP<1>; COT<1> *

P127 + P126

− Autorecloser active: FUN<160>;INF <16>; TYP <1>; COT<1> ↑↓

− Auxiliary input 5: FUN<168>;INF <96>; TYP <1>; COT<1> ↑↓

− Auxiliary input 6: FUN<168>;INF <97>; TYP <1>; COT<1> ↑↓

− Auxiliary input 7: FUN<168>;INF <98>; TYP <1>; COT<1> ↑↓

− Logical input 5: FUN<168>;INF <164>; TYP <1>; COT<1> ↑↓

− Logical input 6: FUN<168>;INF <165>; TYP <1>; COT<1> ↑↓

− Logical input 7: FUN<168>;INF <166>; TYP <1>; COT<1> ↑↓

− Logical output 7: FUN<168>;INF <183>; TYP <1>; COT<1> ↑↓

− Logical output 8: FUN<168>;INF <184>; TYP <1>; COT<1> ↑↓

− Reset thermal state: FUN<168>;INF<6>; TYP<1>; COT<1> *

P127 only (optional board)

− Auxiliary input 8: FUN<168>;INF <99>; TYP <1>; COT<1> ↑↓

− Auxiliary input 9: FUN<168>;INF <100>; TYP <1>; COT<1> ↑↓

− Auxiliary input 10: FUN<168>;INF <101>; TYP <1>; COT<1> ↑↓

− Auxiliary input 11: FUN<168>;INF <102>; TYP <1>; COT<1> ↑↓

− Auxiliary input 12: FUN<168>;INF <103>; TYP <1>; COT<1> ↑↓

− Logical input 8: FUN<168>;INF <167>; TYP <1>; COT<1> ↑↓

− Logical input 9: FUN<168>;INF <168>; TYP <1>; COT<1> ↑↓

Communications P12y/EN CT/E95
IEC 60870-5-103 DATABASE
MiCOM P125/P126 & P127 Page 111/148

− Logical input A: FUN<168>;INF <169>; TYP <1>; COT<1> ↑↓

− Logical input B: FUN<168>;INF <170>; TYP <1>; COT<1> ↑↓

− Logical input C: FUN<168>;INF <171>; TYP <1>; COT<1> ↑↓

P127 only

− Setting group number 3 active: FUN<160>;INF <25>; TYP <1>; COT<1> ↑↓

− Setting group number 4 active: FUN<160>;INF <26>; TYP <1>; COT<1> ↑↓

− Setting group number 5 active: FUN<168>;INF<41>; TYP <1>; COT<1> ↑↓

− Setting group number 6 active: FUN<168>;INF<42>; TYP <1>; COT<1> ↑↓

− Setting group number 7 active: FUN<168>;INF<43>; TYP <1>; COT<1> ↑↓

− Setting group number 8 active: FUN<168>;INF<44>; TYP <1>; COT<1> ↑↓

− Setting group copy successful: FUN<168>;INF<240>; TYP <1>; COT<1>,*

Supervision Indications (monitor direction):
P127 + P126

− Trip Circuit Supervision: FUN<160>;INF <36>; TYP <1>; COT<1> ↑↓

− Group warning
(Minor hardware alarm): FUN<160>;INF <46>; TYP <1>; COT<1> ↑↓

− Group alarm
(Major hardware alarm): FUN<160>;INF <47>; TYP <1>; COT<1> ↑↓
Start Indications (monitor direction):
P127 + P126 + P125

− Start IN>: FUN<168>;INF <12>; TYP <2>; COT<1> ↑↓

− Start IN>>: FUN<168>;INF <13>; TYP <2>; COT<1> ↑↓

− Start IN>>>: FUN<168>;INF <14>; TYP <2>; COT<1> ↑↓

− Start / pick-up N: FUN<160>;INF <67>; TYP <2>; COT<1> ↑↓

− Start UN>>>>: FUN<169>;INF <14>; TYP <2>; COT<1> ↑↓

− Start PN>: FUN<169>;INF <84>; TYP <2>; COT<1> ↑↓

− Start PN>>: FUN<169>;INF <85>; TYP <2>; COT<1> ↑↓

P127 + P126

− Start I>: FUN<168>;INF <9>; TYP <2>; COT<1> ↑↓

− Start I>>: FUN<168>;INF <10>; TYP <2>; COT<1> ↑↓

− Start I>>>: FUN<168>;INF <11>; TYP <2>; COT<1> ↑↓

− Start I<: FUN<168>;INF <73>; TYP <2>; COT<1> ↑↓

− Start I2>: FUN<168>;INF <57>; TYP <2>; COT<1> ↑↓

− Start I2>>: FUN<168>;INF <74>; TYP <2>; COT<1> ↑↓

− Start I2>>>: FUN<168>;INF <76>; TYP <2>; COT<1> ↑↓

− General Start / pick-up: FUN<160>;INF <84>; TYP <2>; COT<1> ↑↓

− Start Therm: FUN<168>;INF <15>; TYP <2>; COT<1> ↑↓

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− Start Broken conductor: FUN<168>;INF <38>; TYP <2>; COT<1> ↑↓

− CB Operating time: FUN<168>;INF <59>; TYP <2>; COT<1> ↑↓

− CB Operation number: FUN<168>;INF <60>; TYP <2>; COT<1> ↑↓

− SA2n: FUN<168>;INF <61>; TYP <2>; COT<1> ↑↓

− CB Closing time: FUN<168>;INF <63>; TYP <2>; COT<1> ↑↓

− CB Fail extern.(“SF6 low”): FUN<168>;INF <224>; TYP <2>; COT<1> ↑↓

− Cold load Start: FUN<168>;INF <37>; TYP <2>; COT<1> ↑↓

− Start tBF: FUN<168>;INF <70>; TYP <2>; COT<1> ↑↓

P127 only

− Start IN>>>>: FUN<168>;INF <24>; TYP <2>; COT<1> ↑↓

− Start U<: FUN<169>;INF <73>; TYP <2>; COT<1> ↑↓

− Start U<<: FUN<169>;INF <100>; TYP <2>; COT<1> ↑↓

− Start U>: FUN<169>;INF <9>; TYP <2>; COT<1> ↑↓

− Start U>>: FUN<169>;INF <10>; TYP <2>; COT<1> ↑↓

− 51V: I>> blocked: FUN<169>;INF <134>; TYP <2>; COT<1> ↑↓

− 51V: I>>> blocked: FUN<169>;INF <135>; TYP <2>; COT<1> ↑↓

− Start VTS: FUN<169>;INF <136>; TYP <2>; COT<1> ↑↓

− Start V2>: FUN<169>;INF <137>; TYP <2>; COT<1> ↑↓

− Start V2>>: FUN<169>;INF <138>; TYP <2>; COT<1> ↑↓

− Start CTS: FUN<160>;INF <32>; TYP <2>; COT<1> ↑↓

− Start P>: FUN<169>;INF <150>; TYP <2>; COT<1> ↑↓

− Start P>>: FUN<169>;INF <151>; TYP <2>; COT<1> ↑↓

− Start P<: FUN<169>;INF <154>; TYP <2>; COT<1> ↑↓

− Start P<<: FUN<169>;INF <155>; TYP <2>; COT<1> ↑↓

− Start Q>: FUN<169>;INF <158>; TYP <2>; COT<1> ↑↓

− Start Q>>: FUN<169>;INF <159>; TYP <2>; COT<1> ↑↓

− Start Q<: FUN<169>;INF <162>; TYP <2>; COT<1> ↑↓

− Start Q<<: FUN<169>;INF <163>; TYP <2>; COT<1> ↑↓

− Blocking Inrush: FUN<168>;INF <225>; TYP <2>; COT<1>,↑↓

− Start F1: FUN<169>;INF <112>; TYP <2>; COT<1> ↑↓

− Start F2: FUN<169>;INF <114>; TYP <2>; COT<1> ↑↓

− Start F3: FUN<169>;INF <116>; TYP <2>; COT<1> ↑↓

− Start F4: FUN<169>;INF <118>; TYP <2>; COT<1> ↑↓

− Start F5: FUN<169>;INF <120>; TYP <2>; COT<1> ↑↓

− Start F6: FUN<169>;INF <122>; TYP <2>; COT<1> ↑↓

− Non measured Freq.: FUN<169>;INF <124>; TYP <2>; COT<1> ↑↓

Communications P12y/EN CT/E95
IEC 60870-5-103 DATABASE
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Fault Indications (monitor direction):

P127 + P126 + P125

− Start / pick-up N: FUN<160>;INF <67>; TYP <2>; COT<1> ↑↓

− General Trip: FUN<160>;INF <68>; TYP <2>; COT<1> ↑↓

− Trip IN>: FUN<160>;INF <92>; TYP <2>; COT<1> ↑↓

− Trip IN>>: FUN<160>;INF <93>; TYP <2>; COT<1> ↑↓

− Trip IN>>>: FUN<168>;INF <22>; TYP <2>; COT<1> ↑↓

− Trip UN>>>>: FUN<169>;INF <22>; TYP <2>; COT<1> ↑↓

− Trip PN>: FUN<169>;INF <86>; TYP <2>; COT<1> ↑↓

− Trip PN>>: FUN<169>;INF <87>; TYP <2>; COT<1> ↑↓

− Local Mode (input): FUN<168>;INF <40>; TYP <2>; COT<1> ↑↓

P127 + P126

− Trip L1: FUN<160>;INF <69>; TYP <2>; COT<1> ↑↓

− Trip L2: FUN<160>;INF <70>; TYP <2>; COT<1> ↑↓

− Trip L3: FUN<160>;INF <71>; TYP <2>; COT<1> ↑↓

− Trip I>: FUN<160>;INF <90>; TYP <2>; COT<1> ↑↓

− Trip I>>: FUN<160>;INF <92>; TYP <2>; COT<1> ↑↓

− Trip I>>>: FUN<168>;INF <19>; TYP <2>; COT<1> ↑↓

− Trip I<: FUN<168>;INF <23>; TYP <2>; COT<1> ↑↓

− Trip I2>: FUN<168>;INF <58>; TYP <2>;COT<1> ↑↓

− Trip I2>>: FUN<168>;INF <75>; TYP <2>; COT<1> ↑↓

− Trip I2>>>: FUN<168>;INF <77>; TYP <2>; COT<1> ↑↓

− Trip Therm: FUN<168>;INF <16>; TYP <2>; COT<1> ↑↓

− Breaker failure trip: FUN<160>;INF <85>; TYP <2>; COT<1> ↑↓

− Broken conductor trip: FUN<168>;INF <39>; TYP <2>; COT<1> ↑↓

− Manual Close (SOTF, input): FUN<168>;INF <238>; TYP <2>; COT<1> ↑↓

− SOTF trip: FUN<168>;INF <239>; TYP <2>; COT<1> ↑↓

− Logic Equation A trip: FUN<168>;INF <144>; TYP <2>; COT<1> ↑↓

− Logic Equation B trip: FUN<168>;INF <145>; TYP <2>; COT<1> ↑↓

− Logic Equation C trip: FUN<168>;INF <146>; TYP <2>; COT<1> ↑↓

− Logic Equation D trip: FUN<168>;INF <147>; TYP <2>; COT<1> ↑↓

− Logic Equation E trip: FUN<168>;INF <196>; TYP <2>; COT<1> ↑↓

− Logic Equation F trip: FUN<168>;INF <197>; TYP <2>; COT<1> ↑↓

− Logic Equation G trip: FUN<168>;INF <198>; TYP <2>; COT<1> ↑↓

− Logic Equation H trip: FUN<168>;INF <199>; TYP <2>; COT<1> ↑↓

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P127 only

− Trip IN>>>>: FUN<168>;INF <25>; TYP <2>; COT<1> ↑↓

− Trip U<: FUN<169>;INF <23>; TYP <2>; COT<1> ↑↓

− Trip U<<: FUN<169>;INF <101>; TYP <2>; COT<1> ↑↓

− Trip U>: FUN<169>;INF <90>; TYP <2>; COT<1> ↑↓

− Trip U>>: FUN<169>;INF <92>; TYP <2>; COT<1> ↑↓

− Trip P>: FUN<169>;INF <152>; TYP <2>; COT<1> ↑↓

− Trip P>>: FUN<169>;INF <153>; TYP <2>; COT<1> ↑↓

− Trip P<: FUN<169>;INF <156>; TYP <2>; COT<1> ↑↓

− Trip P<<: FUN<169>;INF <157>; TYP <2>; COT<1> ↑↓

− Trip Q>: FUN<169>;INF <160>; TYP <2>; COT<1> ↑↓

− Trip Q>>: FUN<169>;INF <161>; TYP <2>; COT<1> ↑↓

− Trip Q<: FUN<169>;INF <164>; TYP <2>; COT<1> ↑↓

− Trip Q<<: FUN<169>;INF <165>; TYP <2>; COT<1> ↑↓

− Trip F1: FUN<169>;INF <113>; TYP <2>; COT<1> ↑↓

− Trip F2: FUN<169>;INF <115>; TYP <2>; COT<1> ↑↓

− Trip F3: FUN<169>;INF <117>; TYP <2>; COT<1> ↑↓

− Trip F4: FUN<169>;INF <119>; TYP <2>; COT<1> ↑↓

− Trip F5: FUN<169>;INF <121>; TYP <2>; COT<1> ↑↓

− Trip F6: FUN<169>;INF <123>; TYP <2>; COT<1> ↑↓

− Trip dFdT1: FUN<169>;INF <128>; TYP <2>; COT<1> ↑↓

− Trip dFdT2: FUN<169>;INF <129>; TYP <2>; COT<1> ↑↓

− Trip dFdT3: FUN<169>;INF <130>; TYP <2>; COT<1> ↑↓

− Trip dFdT4: FUN<169>;INF <131>; TYP <2>; COT<1> ↑↓

− Trip dFdT5: FUN<169>;INF <132>; TYP <2>; COT<1> ↑↓

− Trip dFdT6: FUN<169>;INF <133>; TYP <2>; COT<1> ↑↓

Auto-recloser Indications (monitor direction):
P127 + P126

− Circuit Breaker ‘ON’ by

short-time autorecloser: FUN<160>;INF <128>; TYP <1>; COT<1> ↑↓

− Circuit Breaker ‘ON’ by

long-time autorecloser: FUN<160>;INF <129>; TYP <1>; COT<1> ↑↓

− Autorecloser internally locked: FUN<160>;INF <130>; TYP <1>; COT<1> ↑↓

− Autorecloser externally locked: FUN<168>;INF <68>; TYP <1>; COT<1> ↑↓

− Autorecloser successful: FUN<168>;INF <64>; TYP <1>; COT<1> ↑↓

− CB in O/O (« closed ») position: FUN<168>;INF <33>; TYP <1>; COT<1> ↑↓

− CB in F/O (« open ») position: FUN<168>;INF <34>; TYP <1>; COT<1> ↑↓

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− Trip TC: FUN<168>;INF <1>; TYP <1>; COT<1> ↑↓

− Close TC: FUN<168>;INF <2>; TYP <1>; COT<1> ↑↓

1.3 System state
It is given in the answer to the General Interrogation (GI).
Relay state information is Class 1 data, they are systematically sent to the master station,
during a General Interrogation.
The list of processed data, following a General Interrogation, is given below; it is a sub-
assembly of the spontaneous messages list, so like spontaneous messages, these data are
generated on rising and falling edge.
The following indications are sent to the master station if the option “Basic” or
“Advanced GI” is chosen in the ‘COMMUNICATION / GI Select’ menu.
Status indications (monitor direction):
P127 + P126 + P125

− Local parameter Setting active: FUN<160>;INF <22>; TYP <1>; COT<9>

− Signals&measurements
blocking active: FUN<160>;INF <20>; TYP <1>; COT<9>

− Commands blocking active: FUN<168>;INF <151>; TYP <1>; COT<9>

− Setting group number 1 active: FUN<160>;INF <23>; TYP <1>; COT<9>

− Setting group number 2 active: FUN<160>;INF <24>; TYP <1>; COT<9>

− Auxiliary input 1: FUN<160>;INF <27>; TYP <1>; COT<9>

− Auxiliary input 2: FUN<160>;INF <28>; TYP <1>; COT<9>

− Auxiliary input 3: FUN<160>;INF <29>; TYP <1>; COT<9>

− Auxiliary input 4: FUN<160>;INF <30>; TYP <1>; COT<9>

− Auxiliary input 5: FUN<168>;INF <96>; TYP <1>; COT<9>

− Auxiliary input 6: FUN<168>;INF <97>; TYP <1>; COT<9>

− Auxiliary input 7: FUN<168>;INF <98>; TYP <1>; COT<9>

− Logical input 1: FUN<168>;INF <160>; TYP <1>; COT<9>

− Logical input 2: FUN<168>;INF <161>; TYP <1>; COT<9>

− Logical input 3: FUN<168>;INF <162>; TYP <1>; COT<9>

− Logical input 4: FUN<168>;INF <163>; TYP <1>; COT<9>

− Logical input 5: FUN<168>;INF <164>; TYP <1>; COT<9>

− Logical output 1: FUN<168>;INF <176>; TYP <1>; COT<9>

− Logical output 2: FUN<168>;INF <177>; TYP <1>; COT<9>

− Logical output 3: FUN<168>;INF <178>; TYP <1>; COT<9>

− Logical output 4: FUN<168>;INF <179>; TYP <1>; COT<9>

− Watch Dog output: FUN<168>;INF <180>; TYP <1>; COT<9>

− Logical output 5: FUN<168>;INF <181>; TYP <1>; COT<9>

− Logical output 6: FUN<168>;INF <182>; TYP <1>; COT<9>

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P127 + P126

− Autorecloser active: FUN<160>;INF <16>; TYP <1>; COT<9>

− Logical input 6: FUN<168>;INF <165>; TYP <1>; COT<9>

− Logical input 7: FUN<168>;INF <166>; TYP <1>; COT<9>

− Logical output 7: FUN<168>;INF <183>; TYP <1>; COT<9>

− Logical output 8: FUN<168>;INF <184>; TYP <1>; COT<9>

P127 only (optional board)

− Auxiliary input 8: FUN<168>;INF <99>; TYP <1>; COT<9>

− Auxiliary input 9: FUN<168>;INF <100>; TYP <1>; COT<9>

− Auxiliary input 10: FUN<168>;INF <101>; TYP <1>; COT<9>

− Auxiliary input 11: FUN<168>;INF <102>; TYP <1>; COT<9>

− Auxiliary input 12: FUN<168>;INF <103>; TYP <1>; COT<9>

− Logical input 8: FUN<168>;INF <167>; TYP <1>; COT<9>

− Logical input 9: FUN<168>;INF <168>; TYP <1>; COT<9>

− Logical input A: FUN<168>;INF <169>; TYP <1>; COT<9>

− Logical input B: FUN<168>;INF <170>; TYP <1>; COT<9>

− Logical input C: FUN<168>;INF <171>; TYP <1>; COT<9>

P127 only

− Setting group number 3 active: FUN<160>;INF <25>; TYP <1>; COT<9> ↑↓

− Setting group number 4 active: FUN<160>;INF <26>; TYP <1>; COT<9> ↑↓

− Setting group number 5 active: FUN<168>;INF<41>; TYP <1>; COT<9> ↑↓

− Setting group number 6 active: FUN<168>;INF<42>; TYP <1>; COT<9> ↑↓

− Setting group number 7 active: FUN<168>;INF<43>; TYP <1>; COT<9> ↑↓

− Setting group number 8 active: FUN<168>;INF<44>; TYP <1>; COT<9> ↑↓

Supervision Indications (monitor direction):
P127 + P126

− Trip Circuit Supervision: FUN<160>;INF <36>; TYP <1>; COT<9>

− Group warning
(Minor hardware alarm): FUN<160>;INF <46>; TYP <1>; COT<9>

− Group alarm
(Major hardware alarm): FUN<160>;INF <47>; TYP <1>; COT<9>
Start Indications (monitor direction):
P127 + P126 + P125

− Start / pick-up N: FUN<160>;INF <67>; TYP <2>; COT<9>

− General Start / pick-up: FUN<160>;INF <84>; TYP <2>; COT<9>

− Start IN>: FUN<168>;INF <12>; TYP <2>; COT<9>

− Start IN>>: FUN<168>;INF <13>; TYP <2>; COT<9>

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− Start IN>>>: FUN<168>;INF <14>; TYP <2>; COT<9>

− Start UN>>>>: FUN<169>;INF <14>; TYP <2>; COT<9>

− Start PN>: FUN<169>;INF <84>; TYP <2>; COT<9>

− Start PN>>: FUN<169>;INF <85>; TYP <2>; COT<9>

P127 + P126

− Start I>: FUN<168>;INF <9>; TYP <2>; COT<9>

− Start I>>: FUN<168>;INF <10>; TYP <2>; COT<9>

− Start I>>>: FUN<168>;INF <11>; TYP <2>; COT<9>

− Start I<: FUN<168>;INF <73>; TYP <2>; COT<9>

− Start I2>: FUN<168>;INF <57>; TYP <2>; COT<9>

− Start I2>>: FUN<168>;INF <74>; TYP <2>; COT<9>

− Start I2>>>: FUN<168>;INF <76>; TYP <2>; COT<9>

− Start Therm: FUN<168>;INF <15>; TYP <2>; COT<9>

P127 only

− Start IN>>>>: FUN<168>;INF <24>; TYP <2>; COT<9>

− Start U>: FUN<169>;INF <9>; TYP <2>; COT<9>

− Start U>>: FUN<169>;INF <10>; TYP <2>; COT<9>

− Start U<: FUN<169>;INF <73>; TYP <2>; COT<9>

− Start U<<: FUN<169>;INF <100>; TYP <2>; COT<9>

− Start CTS: FUN<160>;INF <32>; TYP <2>; COT<9>

− 51V: I>> blocked: FUN<169>;INF <134>; TYP <2>; COT<9>

− 51V: I>>> blocked: FUN<169>;INF <135>; TYP <2>; COT<9>

− Start VTS: FUN<169>;INF <136>; TYP <2>; COT<9>

− Start V2>: FUN<169>;INF <137>; TYP <2>; COT<9>

− Start V2>>: FUN<169>;INF <138>; TYP <2>; COT<9>

− Blocking Inrush: FUN<168>;INF <225>; TYP <2>; COT<9>

− Start F1: FUN<169>;INF <112>; TYP <2>; COT<9>

− Start F2: FUN<169>;INF <114>; TYP <2>; COT<9>

− Start F3: FUN<169>;INF <116>; TYP <2>; COT<9>

− Start F4: FUN<169>;INF <118>; TYP <2>; COT<9>

− Start F5: FUN<169>;INF <120>; TYP <2>; COT<9>

− Start F6: FUN<169>;INF <122>; TYP <2>; COT<9>

− Non measured Freq.: FUN<169>;INF <124>; TYP <2>; COT<9>

− Start P>: FUN<169>;INF <150>; TYP <2>; COT<9>

− Start P>>: FUN<169>;INF <151>; TYP <2>; COT<9>

− Start P<: FUN<169>;INF <154>; TYP <2>; COT<9>

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− Start P<<: FUN<169>;INF <155>; TYP <2>; COT<9>

− Start Q>: FUN<169>;INF <158>; TYP <2>; COT<9>

− Start Q>>: FUN<169>;INF <159>; TYP <2>; COT<9>

− Start Q<: FUN<169>;INF <162>; TYP <2>; COT<9>

− Start Q<<: FUN<169>;INF <163>; TYP <2>; COT<9>

Auto-recloser Indications (monitor direction):
P127 + P126

− Autorecloser internally locked: FUN<160>;INF <130>; TYP <1>; COT<9>

− Autorecloser externally locked: FUN<168>;INF <68>; TYP <1>; COT<9>

− CB in O/O (« closed ») position: FUN<168>;INF <33>; TYP <1>; COT<9>

− CB in F/O (« open ») position: FUN<168>;INF <34>; TYP <1>; COT<9>

Fault Indications (monitor direction):
The following indications are sent to the master station only if the option “Advanced
GI” is chosen in the ‘COMMUNICATION / GI Select’ menu.

− General Trip: FUN<160>;INF <68>; TYP <2>; COT<9>

− Trip IN>: FUN<160>;INF <92>; TYP <2>; COT<9>

− Trip IN>>: FUN<160>;INF <93>; TYP <2>; COT<9>

− Trip IN>>>: FUN<168>;INF <22>; TYP <2>; COT<9>

− Trip UN>>>>: FUN<169>;INF <22>; TYP <2>; COT<9>

− Trip PN>: FUN<169>;INF <86>; TYP <2>; COT<9>

− Trip PN>>: FUN<169>;INF <87>; TYP <2>; COT<9>

− Trip L1: FUN<160>;INF <69>; TYP <2>; COT<9>

− Trip L2: FUN<160>;INF <70>; TYP <2>; COT<9>

− Trip L3: FUN<160>;INF <71>; TYP <2>; COT<9>

− Trip I>: FUN<160>;INF <90>; TYP <2>; COT<9>

− Trip I>>: FUN<160>;INF <92>; TYP <2>; COT<9>

− Trip I>>>: FUN<168>;INF <19>; TYP <2>; COT<9>

− Trip I<: FUN<168>;INF <23>; TYP <2>; COT<9>

− Trip I2>: FUN<168>;INF <58>; TYP <2>;COT<9>

− Trip I2>>: FUN<168>;INF <75>; TYP <2>; COT<9>

− Trip I2>>>: FUN<168>;INF <77>; TYP <2>; COT<9>

− Trip Therm: FUN<168>;INF <16>; TYP <2>; COT<9>

− Breaker failure trip: FUN<160>;INF <85>; TYP <2>; COT<9>

− Broken conductor trip: FUN<168>;INF <39>; TYP <2>; COT<9>

− Local Mode (input): FUN<168>;INF <40>; TYP <2>; COT<9>

− Manual Close (SOTF, input): FUN<168>;INF <238>; TYP <2>; COT<9>

− SOTF trip: FUN<168>;INF <239>; TYP <2>; COT<9>

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− Cold load Start: FUN<168>;INF <37>; TYP <2>; COT<9>

− Logic Equation A trip: FUN<168>;INF <144>; TYP <2>; COT<9>

− Logic Equation B trip: FUN<168>;INF <145>; TYP <2>; COT<9>

− Logic Equation C trip: FUN<168>;INF <146>; TYP <2>; COT<9>

− Logic Equation D trip: FUN<168>;INF <147>; TYP <2>; COT<9>

− Logic Equation E trip: FUN<168>;INF <196>; TYP <2>; COT<9>

− Logic Equation F trip: FUN<168>;INF <197>; TYP <2>; COT<9>

− Logic Equation G trip: FUN<168>;INF <198>; TYP <2>; COT<9>

− Logic Equation H trip: FUN<168>;INF <199>; TYP <2>; COT<9>

− Trip IN>>>>: FUN<168>;INF <25>; TYP <2>; COT<9>

− Trip U<: FUN<169>;INF <23>; TYP <2>; COT<9>

− Trip U<<: FUN<169>;INF <101>; TYP <2>; COT<9>

− Trip U>: FUN<169>;INF <90>; TYP <2>; COT<9>

− Trip U>>: FUN<169>;INF <92>; TYP <2>; COT<9>

− Trip P>: FUN<169>;INF <152>; TYP <2>; COT<9>

− Trip P>>: FUN<169>;INF <153>; TYP <2>; COT<9>

− Trip P<: FUN<169>;INF <156>; TYP <2>; COT<9>

− Trip P<<: FUN<169>;INF <157>; TYP <2>; COT<9>

− Trip Q>: FUN<169>;INF <160>; TYP <2>; COT<9>

− Trip Q>>: FUN<169>;INF <161>; TYP <2>; COT<9>

− Trip Q<: FUN<169>;INF <164>; TYP <2>; COT<9>

− Trip Q<<: FUN<169>;INF <165>; TYP <2>; COT<9>

− Trip F1: FUN<169>;INF <113>; TYP <2>; COT<9>

− Trip F2: FUN<169>;INF <115>; TYP <2>; COT<9>

− Trip F3: FUN<169>;INF <117>; TYP <2>; COT<9>

− Trip F4: FUN<169>;INF <119>; TYP <2>; COT<9>

− Trip F5: FUN<169>;INF <121>; TYP <2>; COT<9>

− Trip F6: FUN<169>;INF <123>; TYP <2>; COT<9>

− Trip dFdT1: FUN<169>;INF <128>; TYP <2>; COT<9>

− Trip dFdT2: FUN<169>;INF <129>; TYP <2>; COT<9>

− Trip dFdT3: FUN<169>;INF <130>; TYP <2>; COT<9>

− Trip dFdT4: FUN<169>;INF <131>; TYP <2>; COT<9>

− Trip dFdT5: FUN<169>;INF <132>; TYP <2>; COT<9>

− Trip dFdT6: FUN<169>;INF <133>; TYP <2>; COT<9>

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1.4 Processed commands

1.4.1 System commands

− Synchronisation Command: ASDU 6

FUN<255>;INF <0>; TYP <6>; COT<8>
This command can be sent to a specific relay, or global.
The time sent by master is the time of the first bit of the frame. The relay synchronises with
this time, corrected by the frame transmission delay. After updating its time, the relay sends
back acknowledgement info to the master, by giving its new current time. This
acknowledgement message will be an event of ASDU 6 type.

− General Interrogation Initialisation command: ASDU 7

FUN<255>;INF <0>; TYP <7>; COT<9>
This command starts the relay interrogation.
The relay then sends a list of data containing the relay state (see the list described above).
The GI command contains a scan number which will be included in the answers of the GI
cycle generated by the GI command.
If a data has just changed before extracted by the GI, the new state is sent to the master
station.
When an event is generated during the GI cycle, the event is sent in priority, and the GI
cycle is temporarily interrupted. The end of a GI consists in sending an ASDU 8 to the
master station.
If, during a General Interrogation cycle, another GI Initialisation command is received, the
previous answer is stopped, and the new GI cycle is started.
1.4.2 General commands
Control direction: ASDU 20
P127 + P126 + P125

− LEDS Reset: this command acknowledges all alarms on Front Panel:

FUN<160>;INF<19>; TYP<20>; COT<20>

− Setting group number 1: FUN<160>;INF<23>; TYP<20>; COT<20>

− Setting group number 2: FUN<160>;INF<24>; TYP<20>; COT<20>

− Trip TC: FUN<168>;INF<1>; TYP<20>; COT<20>

− Close TC: FUN<168>;INF<2>; TYP<20>; COT<20>

− Unlock relays: FUN<168>;INF<231>; TYP<20>; COT<20>

− General Reset: FUN<168>;INF<232>; TYP<20>; COT<20>

− First alarm acknowledge: FUN<168>;INF <53>; TYP <20>; COT<20>

− All alarms acknowledge: FUN<168>;INF <52>; TYP <20>; COT<20>

P127 + P126

− Auto-recloser On / Off: FUN<160>;INF<16>; TYP<20>; COT<20>

− tCOMM1 order: FUN<168>;INF<234>; TYP<20>; COT<20>

− tCOMM2 order: FUN<168>;INF<235>; TYP<20>; COT<20>

− tCOMM3 order: FUN<168>;INF<227>; TYP<20>; COT<20>

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− tCOMM4 order: FUN<168>;INF<228>; TYP<20>; COT<20>

P127 only

− Setting group number 3: FUN<160>;INF<25>; TYP<20>; COT<20>

− Setting group number 4: FUN<160>;INF<26>; TYP<20>; COT<20>

− Setting group number 5: FUN<168>;INF<41>; TYP<20>; COT<20>

− Setting group number 6: FUN<168>;INF<42>; TYP<20>; COT<20>

− Setting group number 7: FUN<168>;INF<43>; TYP<20>; COT<20>

− Setting group number 8: FUN<168>;INF<44>; TYP<20>; COT<20>

− Setting group copy: FUN<168>;INF<240>; TYP<20>; COT<20>

This command must be used in association with data mapped at address 664h (source
setting group) and 665h (destination setting group).
After executing one of these commands, the relay sends an acknowledgement message,
which contains the result of command execution.
If a state change is the consequence of the command, it must be sent in a ASDU 1 with COT
12 (remote operation).
If the relay receives another command message from the master station before sending the
acknowledgement message, it will be discarded.
Commands which are not processed by the relay are rejected with a negative
acknowledgement message.
1.5 Relay reinitialisation
In case of relay re initialization, the relay send to the master station:

Availability

A message indicating relay (FUN<160>;INF <5>; TYP <5> COT <5>)

start/restart

or a message indicating (FUN<160>;INF <5>; TYP <3> COT <4>)

Reset CU

or a message indicating (FUN<160>;INF <5>; TYP <2> COT <3>)

Reset FCB

Each identification message of the relay (ASDU 5) contains the manufacturer name in 8
ASCII characters (“Schneider Electric”) and 2 free bytes containing: « 127 » or « 126 », or
« 125 » in decimal format, then 2 free bytes containing the software version number in
decimal (for ex.: 112 corresponds to “11.C”).
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1.6 Cyclic Messages

Only measurands can be stored in these messages.
Measurands values are stored in lower levels of communication, before polling by master
station.
In ASDU 9 FUN<160>;INF <148>; TYP <9>; COT<2>
The following values are stored (with a rate such as: 2,4 * nominal value = 4096):
P127 + P126

− RMS Ia

− RMS Ib

− RMS Ic
P127 only

− RMS Ua

− RMS Ub

− RMS Uc

− P

− Q

− Frequency (If frequency is out of bounds, the value is set to « unvalid ».

− In ASDU 3, (ASDU3.4) FUN<160>;INF <147>; TYP <3>; COT<2>

The following values are stored (with a rate such as: 2,4 * nominal value = 4096):

− RMS IN,

− RMS Un.
In first ASDU 77, which is a private ASDU, FUN<168>;INF <209>; TYP <77>; COT<2>
The following values are stored (in IEEE 32 bits floating-point format):

− First value: invalid

P127 + P126

− I1 (module, unit: V)

− I2 (module, unit: V)

− Thermal state (in %)

P127 + P126 + P125

− Harmonic power Pe (unit: W)

− Harmonic power IeCos (unit: A)

− Angle Ie ^ Ue (unit: degree)

P127 + P126

− Angle Ia ^ Ib (unit: degree)

− Angle Ia ^ Ic (unit: degree)

− Angle Ia ^ Ue (unit: degree)

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P127 only

− Angle Ia ^ Va (unit: degree), or Ia ^Uab if cabling mode is 2Vpp + Vr

− Angle Ia ^ Vb (unit: degree), or Ia ^Ubc if cabling mode is 2Vpp + Vr

− Angle Ia ^ Vc (unit: degree), or Ia ^Uca if cabling mode is 2Vpp + Vr

− Apparent power (unit: KVA)

− Apparent energy (unit: KVAh)

These values are not rated.
In second ASDU 77 (private option active) FUN<248>;INF <25>; TYP <77>; COT<2>
The following 4 energy values are stored (in IEEE 32 bits floating-point format):
P127 only

− Positive active energy (unit: KWh)

− Negative active energy (unit: KWh)

− Positive reactive energy (unit: KVARh)

− Negative reactive energy (unit: KVARh)

1.7 Disturbance record extraction

− The disturbance extraction procedure with IEC870-5-103 in MICOM Px2x relays is in

conformance with IEC870-5-103 standard definition.
The maximum disturbance record number stored in a P12y is 5.

− The disturbance record mapping is the following:

P127 only

− Number of analog channels transmitted: 8, which are:

0 Channel 1: Ia current (Phase L1)
1 Channel 2: Ib current (Phase L2)
2 Channel 3: Ic current (Phase L3)
3 Channel 4: IN current (Earth)
4 Channel 5: Ua voltage
5 Channel 6: Ub voltage
6 Channel 7: Uc/U0 voltage
7 Channel 8: Frequency
Identifiers of tags (30) transmitted in ASDU 29 (logical information) for P127:
0 Tag number 1: General start: FUN <160> INF <84>
1 Tag number 2: General Trip: FUN <160> INF <68>
2 Tag number 3: CB Failure: FUN <160> INF <85>
3 Tag number 4: tI>: FUN <160> INF <90>
4 Tag number 5: tI>>: FUN <160> INF <92>
5 Tag number 6: tIN> (Earth): FUN <160> INF <92>
6 Tag number 7: tIN>> (Earth): FUN <160> INF <93>
7 Tag number 8: PN>: FUN <168> INF <86>
8 Tag number 9: PN>>: FUN <168> INF <87>
9 Tag number 10: Log input 1: FUN <168> INF <160>
10 Tag number 11: Log input 2: FUN <168> INF <161>
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11 Tag number 12: Log input 3: FUN <168> INF <162>

12 Tag number 13: Log input 4: FUN <168> INF <163>
13 Tag number 14: Log input 5: FUN <168> INF <164>
14 Tag number 15: Log input 6: FUN <168> INF <165>
15 Tag number 16: Log input 7: FUN <168> INF <166>
16 Tag number 17: Log input 8: FUN <168> INF <167>
17 Tag number 18: Log input 9: FUN <168> INF <168>
18 Tag number 19: Log input 10: FUN <168> INF <169>
19 Tag number 20: Log input 11: FUN <168> INF <170>
20 Tag number 21: Log input 12: FUN <168> INF <171>
21 Tag number 22: Log output 1: FUN <168> INF <176>
22 Tag number 23: Log output 2: FUN <168> INF <177>
23 Tag number 24: Log output 3: FUN <168> INF <178>
24 Tag number 25: Log output 4: FUN <168> INF <179>
25 Tag number 26: Log output 5 (Watch-dog): FUN <168> INF <180>
26 Tag number 27: Log output 6: FUN <168> INF <181>
27 Tag number 28: Log output 7: FUN <168> INF <182>
28 Tag number 29: Log output 8: FUN <168> INF <183>
29 Tag number 30: Log output 9: FUN <168> INF <184>
P126 only
Number of analog channels transmitted: 6, which are:
0 Channel 1: Ia current (Phase L1)
1 Channel 2: Ib current (Phase L2)
2 Channel 3: Ic current (Phase L3)
3 Channel 4: IN current (Earth)
4 Channel 5: Uc/U0 voltage
5 Channel 6: Frequency
Identifiers of tags (25) transmitted in ASDU 29 (logical informations) for P126:
0 Tag number 1: General start: FUN <160> INF <84>
1 Tag number 2: General Trip: FUN <160> INF <68>
2 Tag number 3: CB Failure: FUN <160> INF <85>
3 Tag number 4: tI>: FUN <160> INF <90>
4 Tag number 5: tI>>: FUN <160> INF <92>
5 Tag number 6: tIN> (Earth): FUN <160> INF <92>
6 Tag number 7: tIN>> (Earth): FUN <160> INF <93>
7 Tag number 8: PN>: FUN <168> INF <86>
8 Tag number 9: PN>>: FUN <168> INF <87>
9 Tag number 10: Log input 1: FUN <168> INF <160>
10 Tag number 11: Log input 2: FUN <168> INF <161>
11 Tag number 12: Log input 3: FUN <168> INF <162>
12 Tag number 13: Log input 4: FUN <168> INF <163>
13 Tag number 14: Log input 5: FUN <168> INF <164>
14 Tag number 15: Log input 6: FUN <168> INF <165>
15 Tag number 16: Log input 7: FUN <168> INF <166>
16 Tag number 17: Log output 1: FUN <168> INF <176>
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17 Tag number 18: Log output 2: FUN <168> INF <177>

18 Tag number 19: Log output 3: FUN <168> INF <178>
19 Tag number 20: Log output 4: FUN <168> INF <179>
20 Tag number 21: Log output 5 (Watch-dog): FUN <168> INF <180>
21 Tag number 22: Log output 6: FUN <168> INF <181>
22 Tag number 23: Log output 7: FUN <168> INF <182>
23 Tag number 24: Log output 8: FUN <168> INF <183>
24 Tag number 25: Log output 9: FUN <168> INF <184>
P125 only
Number of analog channels transmitted: 3, which are:
0 Channel 1: IN current (Earth)
1 Channel 2: U0 voltage
2 Channel 3: Frequency
Identifiers of tags (17) transmitted in ASDU 29 (logical informations) for P125:
0 Tag number 1: General start: FUN <160> INF <84>
1 Tag number 2: General Trip: FUN <160> INF <68>
2 Tag number 3: tIN> (Earth): FUN <160> INF <92>
3 Tag number 4: tIN>> (Earth): FUN <160> INF <93>
4 Tag number 5: PN>: FUN <168> INF <86>
5 Tag number 6: PN>>: FUN <168> INF <87>
6 Tag number 7: Log input 1: FUN <168> INF <160>
7 Tag number 8: Log input 2: FUN <168> INF <161>
8 Tag number 9: Log input 3: FUN <168> INF <162>
9 Tag number 10: Log input 4: FUN <168> INF <163>
10 Tag number 11: Log output 1: FUN <168> INF <176>
11 Tag number 12: Log output 2: FUN <168> INF <177>
12 Tag number 13: Log output 3: FUN <168> INF <178>
13 Tag number 14: Log output 4: FUN <168> INF <179>
14 Tag number 15: Log output 5 (Watch-dog): FUN <168> INF <180>
15 Tag number 16: Log output 6: FUN <168> INF <181>
16 Tag number 17: Log output 7: FUN <168> INF <182>
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1.8 Fault data record extraction

The fault data are extracted with IEC870-5-103 in MICOM Px2x relays in conformance with
Schneider Electric IEC870-5-103 private definitions described in document:
MiCOMACAPart4_IEC60870-5-103_G.
These data are uploaded through ASDU 4 messages, containing the following values in
IEEE 32 bits floating-point format, at the end of disturbance record upload, before the
acknowledgement of the record:

− fault number: FUN <243> INF <1>

− active group (F55, 1 to 8): FUN <243> INF <2>

− phase origin (F90): FUN <243> INF <3>

− fault code (F61): FUN <243> INF <4>

− measure unit (Format below): FUN <243> INF <5>

− fault magnitude: FUN <243> INF <6>

− fault Ia magnitude (unit= A): FUN <243> INF <7>

− fault Ib magnitude (unit= A): FUN <243> INF <8>

− fault Ic magnitude (unit= A): FUN <243> INF <9>

− fault Ie magnitude (unit= A): FUN <243> INF <10>

− fault Va magnitude (unit= V): FUN <243> INF <11>

− fault Vb magnitude (unit= V): FUN <243> INF <12>

− fault Vc magnitude (unit= V): FUN <243> INF <13>

− fault Ue magnitude (unit= V): FUN <243> INF <14>

− fault Ia ^ Ubc angle (unit= degree, 0 to 360): FUN <243> INF <15>

− fault Ib ^ Uca angle (unit= degree, 0 to 360): FUN <243> INF <16>

− fault Ic ^ Uab angle (unit= degree, 0 to 360): FUN <243> INF <17>

− fault Ie ^ Ue angle (unit= degree, 0 to 360): FUN <243> INF <18>

Measure unit format:

0 = No
1=V
2=A
3 = W (Active or reactive power).
4 = W for Pe power
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DNP 3.0 DATABASE

MiCOM P125-P126 – V12
P127 – V13
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CONTENT

1. DNP-3 PROTOCOL 131

1.1 Purpose of this document 131
1.2 DNP V3.00 Device Profile 131
1.1 Implementation Table 134
1.3 Point List 137
1.3.1 Binary Input Points 137
1.3.2 Binary Output Status Points and Control Relay Output Blocks 142
1.3.3 Counters 144
1.3.4 Analog Inputs 145
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1. DNP-3 PROTOCOL
1.1 Purpose of this document
The purpose of this document is to describe the specific implementation of the Distributed
Network Protocol (DNP) 3.0 within P12y MiCOM relays.
P12y uses the Triangle MicroWorks, Inc. DNP 3.0 Slave Source Code Library Version 2.18.
This document, in conjunction with the DNP 3.0 Basic 4 Document Set, and the DNP Subset
Definitions Document, provides complete information on how to communicate with P12y via
the DNP 3.0 protocol.
This implementation of DNP 3.0 is fully compliant with DNP 3.0 Subset Definition Level 2,
contains many Subset Level 3 features, and contains some functionality even beyond
Subset Level 3.
1.2 DNP V3.00 Device Profile
The following table provides a “Device Profile Document” in the standard format defined in
the DNP 3.0 Subset Definitions Document. While it is referred to in the DNP 3.0 Subset
Definitions as a “Document,” it is only a component of a total interoperability guide. This
table, in combination with the following should provide a complete
interoperability/configuration guide for P12y:

− the Implementation Table provided in paragraph 4.3 (beginning on page 134),

− and the Point List Tables provided in Section 4.4 (beginning on page 137).

DNP V3.00
DEVICE PROFILE DOCUMENT
(Also see the Implementation Table in Section 1.3, beginning on page 134).
Vendor Name: Schneider Electric
Device Name: SERIAL 20 Platform using the Triangle MicroWorks, Inc. DNP 3.0 Slave
Source Code Library, Version 2.18.
Highest DNP Level Supported: Device Function:
For Requests: Level 2 7 Master
For Responses: Level 2 … Slave
Notable objects, functions, and/or qualifiers supported in addition to the Highest DNP Levels
Supported (the complete list is described in the attached table):
For static (non-change-event) object requests, request qualifier codes 00 and 01 (start-
stop), 07 and 08 (limited quantity), and 17 and 28 (index) are supported in addition to
request qualifier code 06 (no range – or all points).
Static object requests received with qualifiers 00, 01, 06, 07, or 08, will be responded with
qualifiers 00 or 01. Static object requests received with qualifiers 17 or 28 will be
responded with qualifiers 17 or 28.
For change-event object requests, qualifiers 17 or 28 are always responded.
16-bit and 32-bit Analog Change Events with Time may be requested.
The read function code for Object 50 (Time and Date), variation 1, is supported.
Maximum Data Link Frame Size (octets): Maximum Application Fragment Size (octets):
Transmitted: 292 Transmitted: 2048
Received 292 Received: 2048
Maximum Data Link Re-tries: Maximum Application Layer Re-tries:
7 None
… Fixed at 2 … None
7 Configurable 7 Configurable
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DNP V3.00
DEVICE PROFILE DOCUMENT
(Also see the Implementation Table in Section 1.3, beginning on page 134).
Requires Data Link Layer Confirmation:
… Never
… Always
… Sometimes
… Configurable
Requires Application Layer Confirmation:
… Never
… Always
… When reporting Event Data
… When sending multi-fragment responses
… Sometimes
… Configurable
Timeouts while waiting for:

Data Link Confirm: … None … Fixed at 100 m … Variable … Configurable.

Complete Appl. Fragment: … None … Fixed at ____ … Variable … Configurable
Application Confirm: … None … Fixed at 1s … Variable … Configurable
Complete Appl. Response: … None … Fixed at ____ … Variable … Configurable

Others:
Binary input change scanning period: 5ms
Analog input change scanning period: 1s
Sends/Executes Control Operations:

WRITE Binary Outputs … Never … Always … Sometimes … Configurable

SELECT/OPERATE … Never … Always … Sometimes … Configurable
DIRECT OPERATE … Never … Always … Sometimes … Configurable
DIRECT OPERATE – NO ACK … Never … Always … Sometimes … Configurable

Count > 1 … Never … Always … Sometimes … Configurable

Pulse On … Never … Always … Sometimes … Configurable
Pulse Off … Never … Always … Sometimes … Configurable
Latch On … Never … Always … Sometimes … Configurable
Latch Off … Never … Always … Sometimes … Configurable

Queue … Never … Always … Sometimes … Configurable

Clear Queue … Never … Always … Sometimes … Configurable
Reports Binary Input Change Events when Reports time-tagged Binary Input Change Events
no specific variation requested: when no specific variation requested:

… Never … Never for P121

… Only time-tagged for P126 and P127 … Binary Input Change With Time for
… Only non-time-tagged for P125 P126 and P127
… Configurable … Binary Input Change With Relative Time
… Configurable (attach explanation)
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DNP V3.00
DEVICE PROFILE DOCUMENT
(Also see the Implementation Table in Section 1.3, beginning on page 134).
Sends Unsolicited Responses: Sends Static Data in Unsolicited Responses:

… Never … Never
… Configurable … When Device Restarts
… Only certain objects … When Status Flags Change
… Sometimes (attach explanation)
… ENABLE/DISABLE UNSOLICITED No other options are permitted.
… Function codes supported
Default Counter Object/Variation: Counters Roll Over at:

… No Counters Reported … No Counters Reported

… Configurable … Configurable (attach explanation)
… Default Object: 20 … 16 Bits
… Default Variation: 5 … 32 Bits
… Point-by-point list attached … Other Value: _____
… Point-by-point list attached
Sends Multi-Fragment Responses:

… Yes
… No
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1.3 Implementation Table

The following table identifies the variations, function codes, and qualifiers supported by the
P12y in both request messages and in response messages.
For static (non-change-event) objects, requests sent with qualifiers 00, 01, 06, 07, or 08, will
be responded with qualifiers 00 or 01. Static object requests sent with qualifiers 17 or 28 will
be responded with qualifiers 17 or 28. For change-event objects, qualifiers 17 or 28 are
always responded.

In the table below the text shaded as indicates

Subset Level 3
Subset Level 3 functionality
beyond Subset indicates
(beyond Subset Level 2), and text shaded as
Level 3 functionality
beyond Subset Level 3.

REQUEST RESPONSE
OBJECT
(Library will parse) (Library will respond with)
Object Variation Function Codes Qualifier Function Qualifier
Description (dec)
Number Number Codes (hex) Codes (dec) Codes (hex)
1 0 Binary Input (Variation 0 is used 1 (read) 00, 01 (start-stop)
06 (no range, or all)
to request default variation)
07, 08 (limited qty)
17, 28 (index)
1 1 Binary Input 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
(default – 22 06 (no range, or all) 17, 28 (index –
see note 1) 07, 08 (limited qty) see note 2)
17, 28 (index)
1 2 Binary Input with Status 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index
2 0 Binary Input Change (Variation 0 1 (read) 06 (no range, or all)
07, 08 (limited qty)
is used to request default
variation)
2 1(default – Binary Input Change without 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
see note 1 for 07, 08 (limited qty)
Time
P120 - P121)
2 2 Binary Input Change with Time 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
(default – 07, 08 (limited qty)
see note 1)
10 0 Binary Output Status (Variation 0 1 (read) 00, 01 (start-stop)
06 (no range, or all)
is used to request default
07, 08 (limited qty)
variation) 17, 28 (index)
10 2 Binary Output Status 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
(default – 06 (no range, or all) 17, 28 (index –
see note 1) 07, 08 (limited qty) see note 2)
17, 28 (index)
12 1 Control Relay Output Block 3 (select) 00, 01 (start-stop) 129 (response) echo of request
4 (operate) 07, 08 (limited qty)
5 (direct op) 17, 28 (index)
6 (dir. op, noack)
20 0 Binary Counter (Variation 0 is 1 (read) 00, 01 (start-stop)
7 (freeze) 06 (no range, or all)
used to request default variation)
8 (freeze noack) 07, 08 (limited qty)
9 (freeze clear) 17, 28 (index)
10 (frz. cl. Noack)
20 1 32-Bit Binary Counter 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
7 (freeze) 06 (no range, or all) 17, 28 (index –
8 (freeze noack) 07, 08 (limited qty) see note 2)
9 (freeze clear) 17, 28 (index)
10 (frz. cl. Noack)
20 2 16-Bit Binary Counter 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
7 (freeze) 06 (no range, or all) 17, 28 (index –
8 (freeze noack) 07, 08 (limited qty) see note 2)
9 (freeze clear) 17, 28 (index)
10 (frz. cl. Noack)
20 5 32-Bit Binary Counter without 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
7 (freeze) 06 (no range, or all) 17, 28 (index –
Flag
8 (freeze noack) 07, 08 (limited qty) see note 2)
9 (freeze clear) 17, 28 (index)
10 (frz. cl. Noack)
20 6 16-Bit Binary Counter without 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
7 (freeze) 06 (no range, or all) 17, 28 (index –
Flag
8 (freeze noack) 07, 08 (limited qty) see note 2)
9 (freeze clear) 17, 28 (index)
10 (frz. cl. Noack)
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REQUEST RESPONSE
OBJECT
(Library will parse) (Library will respond with)
Object Variation Function Codes Qualifier Function Qualifier
Description (dec)
Number Number Codes (hex) Codes (dec) Codes (hex)
21 0 Frozen Counter (Variation 0 is 1 (read) 00, 01 (start-stop)
06 (no range, or all)
used to request default variation)
07, 08 (limited qty)
17, 28 (index)
21 1 32-Bit Frozen Counter 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
21 2 16-Bit Frozen Counter 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
21 9 32-Bit Frozen Counter without 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
Flag
07, 08 (limited qty) see note 2)
17, 28 (index)
21 10 16-Bit Frozen Counter without 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
Flag
07, 08 (limited qty) see note 2)
17, 28 (index)
30 0 Analog Input (Variation 0 is used 1 (read) 00, 01 (start-stop)
06 (no range, or all)
to request default variation)
07, 08 (limited qty)
17, 28 (index)
30 1 32-Bit Analog Input 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
(default – 06 (no range, or all) 17, 28 (index –
see note 1 07, 08 (limited qty) see note 2)
17, 28 (index)
30 2 16-Bit Analog Input 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
30 3 32-Bit Analog Input without Flag 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
30 4 16-Bit Analog Input without Flag 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
32 0 Analog Change Event (Variation 1 (read) 06 (no range, or all)
07, 08 (limited qty)
0 is used to request default
variation)
32 1 32-Bit Analog Change Event 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
(default – 07, 08 (limited qty)
without Time
see note 1)
32 2 16-Bit Analog Change Event 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
07, 08 (limited qty)
without Time
32 3 32-Bit Analog Change Event with 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
07, 08 (limited qty)
Time
32 4 16-Bit Analog Change Event with 1 (read) 06 (no range, or all) 129 (response) 17, 28 (index)
07, 08 (limited qty)
Time
50 0 Time and Date 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
06 (no range, or all) 17, 28 (index –
07, 08 (limited qty) see note 2)
17, 28 (index)
50 1 Time and Date 1 (read) 00, 01 (start-stop) 129 (response) 00, 01 (start-stop)
(default – 2 (write) 06 (no range, or all) 17, 28 (index –
see note 1) 07 (limited qty=1) see note 2)
08 (limited qty)
17, 28 (index)
52 2 Time Delay Fine 129 (response) 07 (limited qty)
(qty = 1)
60 0 Class 0, 1, 2, and 3 Data 1 (read) 06 (no range, or all)

60 1 Class 0 Data 1 (read) 06 (no range, or all) 129 17,28

60 2 Class 1 Data 1 (read) 06 (no range, or all) 129 17,28

07, 08 (limited qty)
60 3 Class 2 Data 1 (read) 06 (no range, or all) 129 17,28
07, 08 (limited qty)
60 4 Class 3 Data 1 (read) 06 (no range, or all) 129 17,28
07, 08 (limited qty)
80 1 Internal Indications 2 (write) 00 (start-stop)
(index must =7)
No Object (function code only) – 13 (cold restart)
See Note 3
No Object (function code only) 14 (warm restart)

No Object (function code only) 23 (delay meas.)

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Note 1: A Default variation refers to the variation responded when variation 0

is requested and/or in class 0, 1, 2, or 3 scans.
Note 2: For static (non-change-event) objects, qualifiers 17 or 28 are only
responded when a request is sent with qualifiers 17 or 28,
respectively. Otherwise, static object requests sent with qualifiers 00,
01, 06, 07, or 08, will be responded with qualifiers 00 or 01. (For
change-event objects, qualifiers 17 or 28 are always responded.).
Note 3: For P12y, a cold restart is implemented as a warm restart – the
executable is not restarted, but the DNP process is restarted.
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1.4 Point List

The tables in the following sections identify all the individual data points provided by this
implementation of DNP 3.0. uses the database protection.
1.4.1 Binary Input Points
Every Binary Input Status points are included in class 0 polls, because they are included in
one of classes 1, 2 or 3.

Binary Input Points

Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (Binary Input without status)
Change Event Variation reported when variation 0 requested: 1 for P125 and
2 (Binary Input Change with
Time) for P126 and P127
P125 P126 P127
init Change Event Class
Point Point Point Name/Description
val. (1, 2, 3 or none)
Index Index Index
0 0 0 Output relay 1 (trip) 0 1
1 1 1 Output relay 2 0 2
2 2 2 Output relay 3 0 2
3 3 3 Output relay 4 0 2
4 4 4 Output relay 0 ( watch dog) 0 2
5 5 5 Output relay 5 0 2
6 6 6 Output relay 6 0 2
7 7 Output relay 7 0 2
8 8 Output relay 8 0 2
7 9 9 Opto isolator 1 0 2
8 10 10 Opto isolator 2 0 2
9 11 11 Opto isolator 3 0 2
10 12 12 Opto isolator 4 0 2
13 13 Opto isolator 5 0 2
14 14 Opto isolator 6 0 2
15 15 Opto isolator 7 0 2
16 16 Phase overcurrent stage 1 start 0 1
17 17 Phase overcurrent stage 1 trip 0 1
18 18 Phase overcurrent stage 2 start 0 1
19 19 Phase overcurrent stage 2 trip 0 1
20 20 Phase overcurrent stage 3 start 0 1
21 21 Phase overcurrent stage 3 trip 0 1
11 22 22 Earth overcurrent stage 1 start 0 1
12 23 23 Earth overcurrent stage 1 trip 0 1
13 24 24 Earth overcurrent stage 2 start 0 1
14 25 25 Earth overcurrent stage 2 trip 0 1
15 26 26 Earth overcurrent stage 3 start 0 1
16 27 27 Earth overcurrent stage 3 trip 0 1
28 28 I min Start 0 1
29 29 tImin trip 0 1
30 30 I2> start 0 1
31 31 tI2> trip 0 1
32 32 I2>> start 0 1
33 33 tI2>> trip 0 1
34 34 I2>>> start 0 1
35 35 tI2>>> trip 0 1
36 U< start 0 1
37 tU< trip 0 1
38 U<< start 0 1
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Binary Input Points

Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (Binary Input without status)
Change Event Variation reported when variation 0 requested: 1 for P125 and
2 (Binary Input Change with
Time) for P126 and P127
P125 P126 P127
init Change Event Class
Point Point Point Name/Description
val. (1, 2, 3 or none)
Index Index Index
39 tU<< trip 0 1
40 U> start 0 1
41 tU> trip 0 1
42 U>> start 0 1
43 tU>> trip 0 1
17 36 44 UN>>>> start 0 1
18 37 45 tUN>>>> trip 0 1
19 38 46 PN> start 0 1
20 39 47 PN> trip 0 1
21 40 48 PN>> start 0 1
22 41 49 PN>> trip 0 1
42 50 Thermal start 0 1
43 51 Thermal trip 0 1
23 44 52 Taux1 0 1
24 45 53 Taux2 0 1
25 46 54 Taux3 0 1
26 47 55 Taux4 0 1
48 56 Logical Equation A trip 0 1
49 57 Logical Equation B trip 0 1
50 58 Logical Equation C trip 0 1
51 59 Logical Equation D trip 0 1
52 60 Broken conductor 0 1
53 61 cb failure 0 1
54 62 Number of cb operation 0 1
55 63 Cb operation time alarm 0 1
56 64 sa2n 0 1
57 65 trip circuit alarm 0 1
58 66 cb close time alarm 0 1
59 67 Internally locked autoreclosure 0 1
60 68 Successful autoreclosure 0 1
61 69 In Progress autoreclosure 0 1
62 70 Final trip (autorecloser) 0 1
63 71 Fault Configuration of 0 3
autoreclosure
64 72 logic Selectivity 1 0 1
65 73 logic Selectivity 2 0 1
27 66 74 Blocking logic 1 0 1
67 75 Blocking logic 2 0 1
68 76 52a 0 1
69 77 52b 0 1
70 78 Lack of SF6 0 1
71 79 Cold load Pick up 0 1
72 80 Start tBF 0 1
73 81 Trip SOTF 0 1
74 82 Manual Close 0 1
75 83 Local Mode 0 1
84 I>> blocked (VCTRLI) 0 1
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Binary Input Points

Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (Binary Input without status)
Change Event Variation reported when variation 0 requested: 1 for P125 and
2 (Binary Input Change with
Time) for P126 and P127
P125 P126 P127
init Change Event Class
Point Point Point Name/Description
val. (1, 2, 3 or none)
Index Index Index
85 I>>> blocked (VCTRLI) 0 1
86 VTS 0 1
87 Start V2> 0 1
88 Start V2>> 0 1
28 76 89 De latching by a logical input 0 1
29 77 90 De latching of the Tripping output relay by 0 1
remote order
30 78 92 Closing order by remote order 0 1
31 79 92 Tripping order by remote order 0 1
80 93 Thermal Resetting by 0 1
communication
32 81 94 Shifting to maintenance mode (remote order) 0 1
33 82 95 Major material Alarms 0 1
34 83 96 Minor material Alarms 0 1
84 97 Phase overcurrent stage 1 trip alarm (latched) 0 3
85 98 Phase overcurrent stage 2 trip alarm (latched) 0 3
86 99 Phase overcurrent stage 3 trip alarm (latched) 0 3
35 87 100 Earth overcurrent stage 1 trip alarm (latched) 0 3
36 88 101 Earth overcurrent stage 2 trip alarm (latched) 0 3
37 89 102 Earth overcurrent stage 3 trip alarm (latched) 0 3
90 103 tI< alarm (latched) 0 3
92 104 tI2> alarm (latched) 0 3
92 105 tI2>> alarm (latched) 0 3
93 106 tI2>>> alarm (latched) 0 3
107 tU< alarm (latched) 0 3
108 tU<< alarm (latched) 0 3
109 tU> alarm (latched) 0 3
110 tU>> alarm (latched) 0 3
38 94 111 tUN>>>> alarm (latched) 0 3
39 95 112 PN> alarm (latched) 0 3
40 96 113 PN>> alarm (latched) 0 3
97 114 Thermal start alarm (latched) 0 3
98 115 Thermal trip alarm (latched) 0 3
41 99 116 Taux1 alarm (latched) 0 3
42 100 117 Taux2 alarm (latched) 0 3
43 101 118 Taux3 alarm (if latched by Trip) 0 3
44 102 119 Taux4 alarm (if latched by Trip) 0 3
103 120 Logical Equation A alarm (latched) 0 3
104 121 Logical Equation B alarm (latched) 0 3
105 122 Logical Equation C alarm (latched) 0 3
106 123 Logical Equation D alarm (latched) 0 3
107 124 Broken conductor alarm (latched) 0 3
108 125 cb failure alarm (latched) 0 3
109 126 trip circuit alarm(latched) 0 3
45 110 127 Latching of Relay 0 2
111 128 Logical Equation E trip 0 1
112 129 Logical Equation F trip 0 1
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Binary Input Points

Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (Binary Input without status)
Change Event Variation reported when variation 0 requested: 1 for P125 and
2 (Binary Input Change with
Time) for P126 and P127
P125 P126 P127
init Change Event Class
Point Point Point Name/Description
val. (1, 2, 3 or none)
Index Index Index
113 130 Logical Equation G trip 0 1
114 131 Logical Equation H trip 0 1
132 Start P> 0 1
133 Start P>> 0 1
134 Trip P> 0 1
135 Trip P>> 0 1
136 Blocking Inrush 0 1
137 Start F1 0 1
138 Start F2 0 1
139 Start F3 0 1
140 Start F4 0 1
141 Start F5 0 1
142 Start F6 0 1
143 Trip F1 0 1
144 Trip F2 0 1
145 Trip F3 0 1
146 Trip F4 0 1
147 Trip F5 0 1
148 Trip F6 0 1
149 Non measured Frequency 0 1
115 150 Logical Equation E alarm (latched) 0 3
116 151 Logical Equation F alarm (latched) 0 3
117 152 Logical Equation G alarm (latched) 0 3
118 153 Logical Equation H alarm (latched) 0 3
154 Trip P> alarm (latched) 0 3
155 Trip P>> alarm (latched) 0 3
156 Trip F1 alarm (latched) 0 3
157 Trip F2 alarm (latched) 0 3
158 Trip F3 alarm (latched) 0 3
159 Trip F4 alarm (latched) 0 3
160 Trip F5 alarm (latched) 0 3
161 Trip F6 alarm (latched) 0 3
162 Opto isolator 8 (optional board) 0 2
163 Opto isolator 9 (optional board) 0 2
164 Opto isolator 10 (optional board) 0 2
165 Opto isolator 11 (optional board) 0 2
166 Opto isolator 12 (optional board) 0 2
119 167 Taux5 0 1
120 168 Taux6 0 1
121 169 Taux7 0 1
170 Taux8 0 1
171 Taux9 0 1
172 Taux10 0 1
173 Taux11 0 1
174 Taux12 0 1
122 175 Taux5 alarm (if latched by Trip) 0 3
123 176 Taux6 alarm (if latched by Trip) 0 3
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Binary Input Points

Static (Steady-State) Object Number: 1
Change Event Object Number: 2
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (Binary Input without status)
Change Event Variation reported when variation 0 requested: 1 for P125 and
2 (Binary Input Change with
Time) for P126 and P127
P125 P126 P127
init Change Event Class
Point Point Point Name/Description
val. (1, 2, 3 or none)
Index Index Index
124 177 Taux7 alarm (if latched by Trip) 0 3
178 Taux8 alarm (if latched by Trip) (optional 0 3
board)
179 Taux9 alarm (if latched by Trip) (optional 0 3
board)
180 Taux10 alarm (if latched by Trip) (optional 0 3
board)
181 Taux11 alarm (if latched by Trip) (optional 0 3
board)
182 Taux12 alarm (if latched by Trip) (optional 0 3
board)
183 Earth overcurrent stage 4 start (IN>>>>)I 0 1
184 Earth overcurrent stage 4 trip (tIN>>>>) 0 1
185 Earth overcurrent stage 4 trip alarm (latched) 0 3
125 186 Externally locked autoreclosure 0 1
187 Start P< 0 1
188 Start P<< 0 1
189 Start Q> 0 1
190 Start Q>> 0 1
191 Start Q< 0 1
192 Start Q<< 0 1
193 Trip P< 0 1
194 Trip P<< 0 1
195 Trip Q> 0 1
196 Trip Q>> 0 1
197 Trip Q< 0 1
198 Trip Q<< 0 1
199 Trip P< alarm (latched) 0 3
200 Trip P<< alarm (latched) 0 3
201 Trip Q> alarm (latched) 0 3
202 Trip Q>> alarm (latched) 0 3
203 Trip Q< alarm (latched) 0 3
204 Trip Q<< alarm (latched) 0 3
205 Trip dFdT1 0 1
206 Trip dFdT2 0 1
207 Trip dFdT3 0 1
208 Trip dFdT4 0 1
209 Trip dFdT5 0 1
210 Trip dFdT6 0 1
211 Trip dFdT1 alarm (latched) 0 3
212 Trip dFdT2 alarm (latched) 0 3
213 Trip dFdT3 alarm (latched) 0 3
214 Trip dFdT4 alarm (latched) 0 3
215 Trip dFdT5 alarm (latched) 0 3
216 Trip dFdT6 alarm (latched) 0 3
217 CTS 0 1
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1.4.2 Binary Output Status Points and Control Relay Output Blocks
The following table lists both the Binary Output Status Points (Object 10) and the Control
Relay Output Blocks (Object 12). Binary Output Status points are not included in class 0
polls.

Binary Output Status Points

Object Number: 10
Request Function Codes supported: 1 (read)
Default Variation reported when variation 0 requested: 2 (Binary Output Status)
Control Relay Output Blocks
Object Number: 12
Request Function Codes supported: 3 (select), 4 (operate),
5 (direct operate), 6 (direct operate, noack)
P125 P126 P127
Initial Status Supported Control Relay
Point Point Point Name/Description
Value Output Block Fields
Index Index Index
0 0 0 De Latch of relays 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
st
1 1 1 Acknowledgement of the 1 0 Unpaired Pulse On,
alarm Paired Trip/Pulse On,
Paired Close/Pulse On
2 2 2 Acknowledgement of all the 0 Unpaired Pulse On,
alarms Paired Trip/Pulse On,
Paired Close/Pulse On
3 3 3 Remote control Tripping 0 Unpaired Pulse On,
Paired Trip/Pulse On,
4 4 4 Remote control Closing 0 Unpaired Pulse On,
Paired Close/Pulse On
5 5 5 Change of Active Group 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
6 6 Thermal State Resetting 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
7 7 Average and Max rms values 0 Unpaired Pulse On,
resetting Paired Trip/Pulse On,
Paired Close/Pulse On
8 8 Counters initialization of the 0 Unpaired Pulse On,
autoreclosure Paired Trip/Pulse On,
Paired Close/Pulse On
9 9 Initialization of rolling demand 0 Unpaired Pulse On,
(average) Paired Trip/Pulse On,
Paired Close/Pulse On
10 10 Initialization of Maximum 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
6 11 11 Reinitialization of I0 harmonic 0 Unpaired Pulse On,
calculation Paired Trip/Pulse On,
Paired Close/Pulse On
12 Reinitialization of Energy 0 Unpaired Pulse On,
counters Paired Trip/Pulse On,
Paired Close/Pulse On
12 13 Re initialization of autoreclosure 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
13 14 CB operation number reset 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
14 15 SA2n reset 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
15 16 Com1 order 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
16 17 Com2 order 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
Communications P12y/EN CT/E95
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Binary Output Status Points

Object Number: 10
Request Function Codes supported: 1 (read)
Default Variation reported when variation 0 requested: 2 (Binary Output Status)
Control Relay Output Blocks
Object Number: 12
Request Function Codes supported: 3 (select), 4 (operate),
5 (direct operate), 6 (direct operate, noack)
P125 P126 P127
Initial Status Supported Control Relay
Point Point Point Name/Description
Value Output Block Fields
Index Index Index
17 18 Com3 order 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
18 19 Com4 order 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
19 20 General reset 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
21 Group 1 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
22 Group 2 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
23 Group 3 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
24 Group 4 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
25 Group 5 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
26 Group 6 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
27 Group 7 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
28 Group 8 select 0 Unpaired Pulse On,
Paired Trip/Pulse On,
Paired Close/Pulse On
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1.4.3 Counters
The following table lists both Binary Counters (Object 20) and Frozen Counters (Object 21).
When a freeze function is performed on a Binary Counter point, the frozen value is available
in the corresponding Frozen Counter point.
Binary Counters and Frozen Counters are not included in class 0 polls.
P125 do not support binary Counters and Frozen Counters.

Binary Counters
Static (Steady-State) Object Number: 20
Change Event Object Number: not supported
Request Function Codes supported: 1 (read), 7 (freeze), 8 (freeze noack)
9 (freeze and clear), 10 (freeze and clear, noack)
Static Variation reported when variation 0 requested: 5 (32-Bit Binary Counter without Flag
Change Event Variation reported when variation 0 requested: none-not supported
Frozen Counters
Static (Steady-State) Object Number: 21
Change Event Object Number: not supported
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 9 (32-Bit Frozen Binary without Flag)
Change Event Variation reported when variation 0 requested: none-not supported
P126 P127
Point Point Name/Description Data type
Index Index
0 0 Max RMS current phase A (A/100) D1
1 1 Max RMS current phase B (A/100) D1
2 2 Max RMS current phase C (A/100) D1
3 3 Average RMS current phase A (A/100) D1
4 4 Average RMS current phase B (A/100) D1
5 5 Average RMS current phase C (A/100) D1
6 6 CB operation number D2
7 7 sa2n ia D3
8 8 sa2n ib D3
9 9 sa2n ic D3
10 10 Total number of autoreclosure cycle D2
11 11 Number of cycles 1 D2
12 12 Number of cycles 2 D2
13 13 Number of cycles 3 D2
14 14 Number of cycles 4 D2
15 15 Definitive Tripping number D2
16 16 Number of closing order D2
17 17 Rolling demand(average) RMS phase A (A/100) D1
18 18 Rolling demand(average) RMS phase B (A/100) D1
19 19 Rolling demand(average) RMS phase C (A/100) D1
20 20 Maximum RMS phase A (after a new initialization) (A/100) D1
21 21 Maximum RMS phase B (after a new initialization) (A/100) D1
22 22 Maximum RMS phase C (after a new initialization) (A/100) D1
23 Positive active energy (kWh/100) D1
24 Negative active energy (kWh/100) D1
25 Positive reactive energy (kVARh/100) D1
26 Negative reactive energy (kVARh/100) D1
27 Max RMS voltage phase A (V/100) D1
28 Max RMS voltage phase B (V/100) D1
29 Max RMS voltage phase C (V/100) D1
30 Average RMS voltage phase A (V/100) D1
31 Average RMS voltage phase B (V/100) D1
32 Average RMS voltage phase C (V/100) D1
33 Apparent energy (kVAh/100) D1
Communications P12y/EN CT/E95
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1.4.4 Analog Inputs

The following table lists Analog Inputs (Object 30). It is important to note that 16-bit and
32-bit variations of Analog Inputs, Analog Output Control Blocks, and Analog Output
Statuses are transmitted through DNP as signed numbers. Even for analog input points that
are not valid as negative values, the maximum positive representation is 32767. For each
point, the “Scaling and Units” column indicates the value of a transmitted 32767. This also
implies the value of a transmitted –32767. The entry in the column does not imply a valid
value for the point.
Always indicating the representation of 32767 in the tables below is a consistent method for
representing scale, applicable to all scaling possibilities.
The “Default Deadband,” and the “Default Change Event Assigned Class” columns are used
to represent the absolute amount by which the point must change before an analog change
event will be generated, and once generated in which class poll (1, 2, 3) will the change
event be reported. Only the default values for these columns are documented here because
the values may change in operation due to either local (user-interface) or remote (through
DNP) control.
Every Analog Inputs points are included in class 0 polls, because they are included in one of
classes 1, 2 or 3.

Analog Inputs
Static (Steady-State) Object Number: 30
Change Event Object Number: 32
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input)
Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o
Time)
Change Event Scan Rate: The scan rate for analog input change events is fixed at 1s
Initial
Change
P125 P126 P127 Scaling and Units Change
Initial Event
Point Point Point Name/Description (representation of Valid Range Event Class
Value Dead-
Index Index Index 32767 – see above) (1, 2, 3 or
band
none)
0 0 0 Active Group 1 32767 1à2 1 1
1 1 Magnitude IA 0 40 In 0 to 40 In 0.02 In 3
2 2 Magnitude IB 0 40 In 0 to 40 In 0.02 In 3
3 3 Magnitude IC 0 40 In 0 to 40 In 0.02 In 3
1 4 4 Magnitude IN 0 40 IEn 0 to 40 IEn 0.02 IEn 3
5 5 rms IA 0A 327.67A 0 to 3
40000000 2%
A/100
6 6 rms IB 0A 327.67A 0 to 3
40000000 2%
A/100
7 7 rms IC 0A 327.67A 0 to 3
40000000 2%
A/100
2 8 8 rms IN 0A 327.67A 0 to 3
40000000 2%
A/100
9 rms VA 0V 327.67V 0 to 3
500000000 2%
V/100
10 rms VB 0V 327.67V 0 to 3
500000000 2%
V/100
11 rms VC 0V 327.67V 0 to 3
500000000 2%
V/100
3 9 12 rms VN 0V 327.67V 0 to 3
500000000 2%
V/100
13 Magnitude VA 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
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Analog Inputs
Static (Steady-State) Object Number: 30
Change Event Object Number: 32
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input)
Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o
Time)
Change Event Scan Rate: The scan rate for analog input change events is fixed at 1s
Initial
Change
P125 P126 P127 Scaling and Units Change
Initial Event
Point Point Point Name/Description (representation of Valid Range Event Class
Value Dead-
Index Index Index 32767 – see above) (1, 2, 3 or
band
none)
14 Magnitude VB 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
15 Magnitude VC 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
4 10 16 Magnitude VN 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
11 17 Thermal State 0% 32767% 0 to 65535 10 3
5 12 18 Frequency 0 327,67 Hz 45Hz to 1Hz 3
65 Hz and
99.99Hz ==
ERROR
13 19 Magnitude I2 0 40 In 0 to 40 In 0.1 In 3
14 20 Magnitude I1 0 40 In 0 to 40 In 0.1 In 3
21 Magnitude V2 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
22 Magnitude V1 0 260V G1* 0 to 260V 0.5V 3
960V G2* 0 to 960V 2V
23 RMS active 3-phase 0 327.67kW -9.999 E8 to 3
power 9.999 E8 2%
kW/100
24 RMS reactive 3- 0 327.67kVAr -9.999 E8 to 3
phase power 9.999 E8 2%
kVAr/100
6 15 25 Harmonic power Pe 0 327.67 W -9.999 E8 to 3
9.999 E8 2%
W/100
7 16 26 Harmonic power 0 327.67 A -9.999 E8 to 3
IeCos 9.999 E8 2%
A/100
8 17 27 Angle Ie ^ Ue 0 32767 0 to 360 ° 1° 3
28 3-phase CosPhi 0 -100 to 100 3
(1/100) 2
18 29 Tripping Time 0 327.67s 0 to 10.00s 10 ms 3
19 30 Closing Time 0 327.67s 0 to 10.00s 10 ms 3
20 31 Fault number 0 32767 0 to 65535 1 2
21 32 group 0 32767 1 to 2 each new 2
fault
22 33 Fault phase 0 32767 0 to 8 (F1) each new 2
fault
23 34 Fault origin 0 32767 0 to each new 2
29 fault
(F2)
24 35 Fault magnitude 0 40 In 0 to 40 In each new 2
fault
25 36 Fault magnitude IA 0 40 In 0 to 40 In each new 2
fault
26 37 Fault magnitude IB 0 40 In 0 to 40 In each new 2
fault
27 38 Fault magnitude IC 0 40 In 0 to 40 In each new 2
fault
28 39 Fault magnitude IN 0 40 IEn 0 to 40 IEn each new 2
fault
40 Fault magnitude VA 0 260V G1* 0 to 260V each new 2
960V G2* 0 to 960V fault
Communications P12y/EN CT/E95
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Analog Inputs
Static (Steady-State) Object Number: 30
Change Event Object Number: 32
Request Function Codes supported: 1 (read)
Static Variation reported when variation 0 requested: 1 (32-Bit Analog Input)
Change Event Variation reported when variation 0 requested: 1 (32-Bit Analog Change Event w/o
Time)
Change Event Scan Rate: The scan rate for analog input change events is fixed at 1s
Initial
Change
P125 P126 P127 Scaling and Units Change
Initial Event
Point Point Point Name/Description (representation of Valid Range Event Class
Value Dead-
Index Index Index 32767 – see above) (1, 2, 3 or
band
none)
41 Fault magnitude VB 0 260V G1* 0 to 260V each new 2
960V G2* 0 to 960V fault
42 Fault magnitude VC 0 260V G1* 0 to 260V each new 2
960V G2* 0 to 960V fault
29 43 Fault magnitude Ue 0 260V G1* 0 to 260V each new 2
960V G2* 0 to 960V fault
44 Fault angle IA ^ UBC 0 32767 0 to 360 ° each new 2
fault
45 Fault angle IB ^ UCA 0 32767 0 to 360 ° each new 2
fault
46 Fault angle IC ^ UAB 0 32767 0 to 360 ° each new 2
fault
30 47 Fault angle Ie ^ Ue 0 32767 0 to 360 ° each new 2
fault
48 RMS apparent power 0 327.67kVA -9.999 E8 to 3
9.999 E8 2%
kVA/100
31 49 Angle Ia ^ Ib 0 32767 0 to 360 ° 1° 3
32 50 Angle Ia ^ Ic 0 32767 0 to 360 ° 1° 3
51 Angle Ia ^ Va 0 32767 0 to 360 ° 1° 3
Or Angle Ia ^ Uab
52 Angle Ia ^ Vb 0 32767 0 to 360 ° 1° 3
Or Angle Ia ^ Ubc
53 Angle Ia ^ Vc 0 32767 0 to 360 ° 1° 3
Or Angle Ia ^ Uca
33 54 Angle Ia ^ Ue 0 32767 0 to 360 ° 1° 3

Format:
F1:
0: None, 1: Phase A, 2: Phase B, 4: Phase C, 3: Phase AB, 5: Phase AC, 6: Phase BC, 7:
Phase A B C, 8: Earth.
F2:
0: Null, 1: Remote trip, 2: thermal overload, 3: tI>, 4: tI>>, 5: tI>>>, 6: tIN>, 7: tIN>>, 8:
tIN>>>, 9: tI<, 10: broken conductor, 11: tU<, 12: tU<<, 13: Pe/Iecos>, 14: Pe/Iecos>>, 15:
tI2>, 16: tI2>>, 17: tI2>>>, 18: tU>, 19: tU>>, 20: tUN>>>>, 21: tAux1, 22: tAux2, 23: tEqu.A,
24: tEqu.B, 25: tEqu.C, 26: tEqu.D, 27:tAux3, 28: tAux4, 29: SOTF, 30: tP>, 31: tP>>, 32:
tF1, 33: tF2, 34: tF3, 35: tF4, 36: tF5, 37: tF6, 38: tEqu.E, 39: tEqu.F, 40: tEqu.G, 41: tEqu.H.
P12y/EN CT/E95 Communications
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BLANK PAGE
Commissioning and Maintenance P12y/EN CM/E95

MiCOM P125/P126 & P127

COMMISSIONING AND
MAINTENANCE GUIDE
Commissioning and Maintenance P12y/EN CM/E95

MiCOM P125/P126 & P127 Page 1/22

CONTENT

1. REQUIREMENTS PRIOR TO COMMISSIONING 3

2. COMMISSIONING TEST ENVIRONMENT 4

2.1 Important notes 4
2.1.1 Injection test sets 4
2.1.2 Additional commissioning test equipment: 4
2.1.3 Communication 4
2.2 Commissioning test sheets 5

3. PRODUCT VERIFICATION TESTS 6

3.1 Allocation of terminals 6
3.2 Electrostatic discharge (ESD) 6
3.3 Visual inspection 6
3.4 Earthing 6
3.5 Current transformers (CT's) 6
3.6 Use of a Core Balance CT for earth faults 7
3.6.1 Cable shields and core CT 7
3.6.2 Core CT polarity 7
3.7 Auxiliary supply 8
3.8 Logic inputs 8
3.9 Logic outputs 9
3.10 RS 485 rear communication 9

4. SETTING CHECK 10
4.1 Settings 10
4.2 Measurements 10
4.2.1 MiCOM P125 10
4.2.2 MiCOM P126 11
4.2.3 MiCOM P127 11
4.3 Thresholds validation 12
4.3.1 MiCOM settings 12
4.3.2 Earth current and neutral voltage test 15
4.4 Final checks 19

5. MAINTENANCE 20
5.1 Equipment failure 20
5.1.1 Minor fault 20
5.1.2 Major fault 20
5.1.3 Hardware and software faults 20
P12y/EN CM/E95 Commissioning and Maintenance

Page 2/22 MiCOM P125/P126 & P127

5.2 Method of repair 21

5.2.1 Replacing the active part 21
5.2.2 Replacing the complete relay 21
5.3 Problem solving 21
5.3.1 Password lost or not accepted 21
5.3.2 Communication 22
Commissioning and Maintenance P12y/EN CM/E95

MiCOM P125/P126 & P127 Page 3/22

1. REQUIREMENTS PRIOR TO COMMISSIONING

The MiCOM P125 P126 and P127 relays are fully numerical in their design, implementing all
protection and non-protection functions in software. The MiCOM relays employ a high
degree of self-checking and, in the unlikely event of a failure, will provide an alarm. As a
result of this, the commissioning test does not need to be as extensive as with non-numerical
relays (static or electromechanical).
To commission MiCOM relays, it is only necessary to verify that the hardware is functioning
correctly and the application-specific software setting have been applied to the MiCOM relay.
It is considered unnecessary to tests every function of the relay if the settings have been
verified by one of the following method:

• Extracting the settings applied to the relay using the appropriate setting software
(preferred method),

• Via the front panel user interface.

REMINDER: It is not possible to download a new setting software as long as
the programming mode is active.
To confirm that the product is operating correctly once the application-specific settings have
been applied, a test should be performed on a single protection element.
Unless previously agreed to the contrary, the customer will be responsible for determining
the application-specific settings to be applied to the MiCOM relays and for testing of any
scheme logic applied by external wiring.
Blank commissioning test and setting records are provided at the chapter
P12y/EN RS of this Technical Guide for completion as required.
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND
ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.
P12y/EN CM/E95 Commissioning and Maintenance

Page 4/22 MiCOM P125/P126 & P127

2. COMMISSIONING TEST ENVIRONMENT

2.1 Important notes
All the commissioning tests of the MiCOM P125, P126, and P127 relays are carried out by
injecting currents and voltages to the secondary of the earth and/or phases CTs and VTs
using appropriate injection test sets provided for this purpose.
2.1.1 Injection test sets
The test of directional protection within P125, P126 and P127 requires at least a phase
current, phase to phase and residual voltage injection.
The test equipment must provide tools to change the phase between voltage and current.
For reasons of convenience (weight, spatial requirement, transportation), a single-phased
current injection and single voltage test set is more suitable for commissioning and is able to
perform all commissioning tests regarding overcurrent directional/non directional protection
of MiCOM P125, P126 & P127 relays.
Thus, the following descriptions indicate how to conduct the commissioning tests with a
single-phase injection test set.
However, for certain commissioning tests, the three-phase wiring diagrams are easier to
understand and in this case the description is also given in three-phase format.
Single-phase injection test set:

− 1 current (0 to 50 A), timer (precision 1 ms),

− 1 voltage (30 to 130V), timer (precision 1 ms).

Three-phase injection test set:

− 3 currents (0 to 50 A), timer (precision 1 ms),

− 3 voltage (30 to 130V), timer (precision 1 ms).

Possibility to lag the current respect to voltage injection.
2.1.2 Additional commissioning test equipment:

− 1 multimeter (precision 1%),

− 1 connecting terminal to measure the currents exceeding 10 A (precision 2%);

Test plugs and wires to carry out injections to the CT's secondary (dimension according to
the currents injected).
2.1.3 Communication
Using the RS 485 communication on the rear connector of the MiCOM P125, P126 & P127
relays or using the RS232 front port can make all commissioning test records.
All above in according to each RS 485 communication protocol (MODBUS,
IEC 60870-5-103,).
Commissioning and Maintenance P12y/EN CM/E95

MiCOM P125/P126 & P127 Page 5/22

2.2 Commissioning test sheets

Commissioning test sheets are available in the chapter P12y/EN RS of this Technical Guide.
The presentation of the Commissioning test sheets follows the description of the tests of this
chapter.
The contents of these Commissioning test sheets enable you to log:

− The name of the relay, station and circuit,

− The characteristics of the MiCOM P125, P126 and P127 relays,

− The various settings,

− The results of the protection and automation checks,

− The result of the test records after commissioning.

P12y/EN CM/E95 Commissioning and Maintenance

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3. PRODUCT VERIFICATION TESTS

BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND
ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.

3.1 Allocation of terminals

It is necessary to consult the appropriate wiring diagram provided in the chapter
P12y/EN CO of this Technical Guide whilst observing the various polarities and ground/earth
connection.
3.2 Electrostatic discharge (ESD)
Before any handling of the module (active part of the relay), please refer to the
recommendations in Safety Section of this Technical Guide.
3.3 Visual inspection
Carefully examine the relay to see if there has been any possible deterioration following
installation.
Check if the external wiring corresponds to the appropriate relay diagram or the assembly
diagram. The reference number of the relay diagram is indicated on a label situated under
the upper flap of the front panel.
When the relay is outside from its case, use a continuity tester to test that the current short-
circuits (phases and earth CT's) between the terminals indicated on the wiring diagram are
closed.
3.4 Earthing
Check if the earth connection of the case situated above the rear terminal block is used to
connect the relay to a local earth bar. With several relays present, make sure that the copper
earth bar is properly installed for solidly connecting the earthing terminals of each case.
3.5 Current transformers (CT's)
WARNING: NEVER OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENT
TRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BE
LETHAL AND COULD DAMAGE INSULATION.
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MiCOM P125/P126 & P127 Page 7/22

3.6 Use of a Core Balance CT for earth faults

If a core balance CT is used to detect earth faults, prior to any test, the user must check the
following points:

− MV or HV cable screens and core CT,

− No current flow through the MV or HV cables,

− Orientation of the core CT (P1-S1, P2-S2).

3.6.1 Cable shields and core CT
When mounting a core balance CT around electric cables, check the connection to the earth
of the cable shields. It is vital that the earth cable of the shield moves in the opposite
direction through the core CT. This cancels the currents carried by the cable shields through
the core CT.

Electrical cables directed

to the busbar Screen shields

P1 S1
P2 S2

Other ends
of electrical cables
P0041ENa

SCREEN SHIELDS AND CT CORE

3.6.2 Core CT polarity
It is necessary to check the polarity of the core CT by following the figure below:
Momentarily connect the battery + to P1 and – to P2. The centre zero ammeter connected
with + to S1 and – to S2 will deflect in the positive direction if the wiring is correct.
The phase CT may be tested using the same method.

P1 S1 _
+ mA
+
_

P2 S2

P0043ENa

CORE CT ORIENTATION TEST

NOTE: De-magnetise the CT after polarity test. Inject an ac current starting
from zero and increase to slowly exceed the CT nominal value and
then decrease slowly to zero.
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3.7 Auxiliary supply

Check the value of the auxiliary supply voltage (terminals 33 and 34). The value measured
shall be between 0.8 and 1.2 times the nominal auxiliary supply voltage indicated on the
MiCOM P125, P126 and P127.
You can read the Uaux range of the relay under the flap on the top of front relay.

Maximum peak value

Uaux range (Volts) Uaux nominal zone (Volts)
(Volts)
24 - 60 Vdc 19 - 72 Vdc 80
48 - 250 Vdc/48 - 250 Vac 38 - 300 Vdc/38 - 275 Vac 336

3.8 Logic inputs

This test checks that all the opto-isolated inputs are functioning correctly. The P125 has 4
(+5 optional) opto-isolated inputs while P126 and P127 have 7 logic opto-isolated inputs.
The opto inputs should be energised a time. The status of the input can be viewed using
menu OP. PARAMETERS/Input Status, a 1 indicating an energised input and a 0 indicating
a de-energised input. When each logic input is energised one of the characters on the
bottom line of the menu display will change to the value show in the following table to
indicate the new state of the inputs.

OP. PARAMETERS/Inputs
Input MiCOM P12x models
Satuts. cell value
Opto input 1 7654321
P125, P126, P127
22-24 Terminals 0000001
Opto input 2 7654321
P125, P126, P127
26-28 Terminals 0000010
Opto input 3 7654321
P125, P126, P127
17-19 Terminals 0000100
Opto input 4 7654321
P125, P126, P127
21-23 Terminals 0001000
Opto input 5 7654321
P126, P127
25-27 Terminals 0010000
Opto input 6 7654321
P126, P127
58-60 Terminals 0100000
Opto input 7 7654321
P126, P127
57-59 Terminals 1000000
Opto input 8 CBA98
P127 (1)
61-62 terminals 00001
Opto input 9 CBA98
P127 (1)
64-62 terminals 00010
Opto input 10 CBA98
P127 (1)
63-62 terminals 00100
Opto input 11 CBA98
P127 (1)
66-62 terminals 01000
Opto input 12 CBA98
P127 (1)
65-62 terminals 10000
(1)
Available only for P127 “5 opto-inputs” option (product codes P127xx1 or P127xx3).
“Input COM – terminal” 62 is the common terminal for inputs 8 to 12.
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MiCOM P125/P126 & P127 Page 9/22

3.9 Logic outputs

This test checks that all output relays are functioning correctly. The P126 and P127 relays
have 8 outputs, P125 relay has 6 outputs.
The watch dog relay is always on. In case of relay failure the watch dog relay moves to the
off and the terminals 35-36 are opened.
The status of the outputs can be viewed using menu OP. PARAMETERS/ Relay Status, an
indicating 1 means relay supplied and a 0 indicating means relay non-supplied. When each
output relay is closed one of the characters on the bottom line of the menu display will
change to the value show in the following table to indicate the new state of the output relays.
Each output contact may have its own and independent power supply (refer to wiring
schemes).

OP. PARAMETERS/Relay
OUTPUT RELAYS MiCOM P125 range
Status. cell value
WD Relay Terminals 35-37 P125, P126 and P127 Normal close
RL 1 Change over type.
Terminals: P125, P126 and P127 00000001
2 Common -4 NC-6 NO
RL 2 Change over type.
Terminals: P125, P126 and P127 00000010
8 Common -10 NC-12 NO
RL 3 Terminals 14-16 P125, P126 and P127 00000100
RL 4 Terminals 18-20 P125, P126 and P127 00001000
RL 5 Terminals 1-3 P125, P126 and P127 00010000
RL 6 Terminals 7-8 P125, P126 and P127 00100000
RL 7 Terminals 9-11 P126 and P127 01000000
RL 8 Terminals 13-15 P126 and P127 10000000

3.10 RS 485 rear communication

This test should only be performed where the relay is to be accessed from a remote location
and will vary depending on the communication protocol being adopted (refer to label under
the upper flap).
It is not the intention of the test to verify the operation of the complete system from the relay
to the remote location, just the relay's rear communication port and any protocol converter
necessary.
Connect a laptop PC to the RS485 rear port (first or second port when present) and check
the communication with the appropriate command.
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4. SETTING CHECK
The setting checks must ensure that all relay settings have been correctly applied to the
relay for the specific application.
Transfer the setting file to the relay using a laptop PC running the appropriate software via
the RS232 front port or the RS485 rear port.
This is the preferred setting transfer method, because it is faster and there are fewer margins
for errors.
If the setting software is not used, the relay settings must be checked manually via the relay
front panel interface.
The commissioning checks are as follows:
1. Settings verify and delivery to customer,
2. Validation of the measurements,
3. Validation of the thresholds and associated timers.
4.1 Settings
Log the settings on the commissioning test sheets.
4.2 Measurements
The MiCOM P125 P126 P127 relays measure phase and earth currents, phase (phase to
phase) voltage, zero sequence voltage as a True RMS value up to the 10th harmonics. The
value(s) indicated take account of the phase and/or earth CT ratio and VT ratio.
WARNING: MiCOM P125 P126 P127 RELAYS HAVE 1 AND 5 A CURRENT INPUTS,
AND 57 –130V OR 220 – 480V VOLTAGE INPUT.
CHECK THAT THE INJECTED CURRENT AND VOLTAGE ARE
COMPATIBLE WITH THE SELECTED RANGE.

4.2.1 MiCOM P125

• Note the CT and neutral VT ratio.

• Energise the MiCOM P125 relay.

• Apply current to input terminals 55-56 (Ien=1A) or 47-48 (Ien=5A) and verify the IN
value shown on the LCD taking in account the relevant nominal current.

• Apply earth voltage to 39-40 terminals and verify in measurements menu the UN value
shown on LCD.

• Log the results to the Commissioning test sheets (Applied value and relay value
displayed).
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MiCOM P125/P126 & P127 Page 11/22

4.2.2 MiCOM P126

• Note the select phase and earth CTs ratio and neutral VT ratio.

• Energise the MiCOM P126 relay.

• Apply current to input terminals 49-50 (In=1A) or 41-42 (In=5A) and verify the IA value
shown on the LCD.

• Apply current to input terminals 51-52 (In=1A) or 43-44 (In=5A) and verify the IB value
shown on the LCD.

• Apply current to input terminals 53-54 (In=1A) or 45-46 (In=5A) and verify the IC value
shown on the LCD.

• Apply current to input terminals 55-56 (Ien=1A) or 47-48 (Ien=5A) and verify the IN
values on the LCD in relay measurement menu.

• Apply earth voltage to 73-74 terminals and verify the UN values on the LCD in relay
measurement menu.

• Log the results to the Commissioning test sheets (Applied values and relay values
displayed).
4.2.3 MiCOM P127

• Configure the relay in CONFIGURATION-General Options item menu as: 2Vph-ph+Vr

VT connection mode. (See User Guide, chapter P12y/EN FT, of this Technical Guide).

• Note the select phase and earth CTs ratio, phase voltage VTs ratio and neutral
voltage VTs ratio.

• Energise the MiCOM P127 relay.

• Apply current to input terminals 49-50 (In=1A) or 41-42 (In=5A) and verify the IA value
shown on the LCD.

• Apply current to input terminals 51-52 (In=1A) or 43-44 (In=5A) and verify the IB value
shown on the LCD.

• Apply current to input terminals 53-54 (In=1A) or 45-46 (In=5A) and verify the IC value
shown on the LCD.

• Apply current to input terminals 55-56 (Ien=1A) or 47-48 (Ien=5A) and verify the IN
values on the LCD in relay measurement menu.

• Apply voltage to inputs terminals 69-70 and 71-72 and verify the UAB and UBC values
in relay measurement menu on the LCD.

• Apply current to input terminals 55-56 (Ien=1A) or 47-48 (Ien=5A) and verify the IN
value in relay measurement menu on the LCD.

• Apply voltage to inputs terminals 73-74 and verify the UN value in relay measurement
menu on the LCD.
Log the results to the Commissioning test sheets (Applied values and relay values
displayed).
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4.3 Thresholds validation

This test type demonstrates that the relay is operating correctly at the application specific
settings.
4.3.1 MiCOM settings
Set the following thresholds for the relay.
Applying the voltage and current to terminals as in wiring diagrams in chapter P12y/EN CO
of this Technical Guide.
The applied current and voltage must be great than setting value.
4.3.1.1 MiCOM P125 Settings

Configuration Menu
Transfo. Ratio
E/Gnd CT primary 1A
E/Gnd CT Sec 1A
E/Gnd VT primary 0.100 kV
E/Gnd VT Sec 100.0 V
Protection Menu
Ie> Yes
Ie> 1 Ien
tIe> DT or IDMT or RI
tIe> (if DT) 10 s
Curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT) 1
K value (if RI) 1
Ue>>>> 10 V
tUe>>>> 10 s
Automation Menu
TRIP tIe> YES
TRIP tUe>>>> YES
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MiCOM P125/P126 & P127 Page 13/22

4.3.1.2 MiCOM P126 Settings

Configuration menu
Transfo. Ratio
Line CT primary 1A
Line CT Sec 1A
E/Gnd CT primary 1A
E/Gnd CT Sec 1A
E/Gnd VT primary 0.100 kV
E/Gnd VT Sec 100.0 V
Protection Menu G1
I> Yes
I> 1 In
tI> DT or IDMT or RI
tI> (if DT) 10 s
Curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT) 1
K value (if RI) 1
Ie> Yes
Ie> 1 In
tIe> DT or IDMT or RI
tIe> (if DT) 20 s
Curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT)1 K value (if RI)1
Ue>>>> 10V
tUe>>>> 10 s
Automation Menu
TRIP tI> YES
TRIP tIe> YES
TRIP tUe>>>> YES
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4.3.1.3 MiCOM P127 settings

CONFIGURATION
General Options
2Vpp+Vr
Transfo. Ratio
Line CT primary 1A
Line CT Sec 1A
E/Gnd CT primary 1A
E/Gnd CT Sec 1A
Line VT primary 0.100 kV
Line VT Sec 100.0 V
E/Gnd VT primary 0.100 kV
E/Gnd VT Sec 100.0 V
Protection Menu G1
I> Yes
I> 1 In
tI> DT or IDMT or RI
tI> (if DT) 10 s
Curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT) 1
K value (if RI) 1
U> Yes
U> 20V
tU> 10 s
Ie> Yes
Ie> 1 In
tIe> DT or IDMT or RI
tIe> (if DT) 20 s
Curve (if IDMT) IEC VI or IEEE VI
TMS value (if IDMT)1 K value (if RI)=1
Ue>>>> 10 V
tUe>>>> 10 s
Automation Menu
TRIP tI> YES
TRIP tU> YES
TRIP tIe> YES
TRIP Ue>>>> YES
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4.3.2 Earth current and neutral voltage test

This test can be executed on the P125, P126 and P127 relay and the operating sequence is
the same for all three relays.
After the setting is completed connect the relay using the wiring diagram in chapter
P12y/EN CO.
4.3.2.1 Earth fault overcurrent and residual over voltage test.
Delay type: Definite time
Used thresholds for this test:

• Ie>, tIe>, Ue >>>>, tUe>>>>.

• Supply the relay, inject current and voltage with magnitude greater then Ie> and
Ue>>>> setting value.

• If the time delay tIe> is short, gradually increases injection current up to the value of
the Ie> threshold.

• If the time delay tIe> is long, inject 0.95 x I threshold and check that there is no
tripping. Then inject 1,1 x Ie threshold and check the trip.

• Gradually decreases the injected current and record the value of the drop out Ie>
threshold.

• The same procedure above for Ue>>>>.

• Checks:

• Alarm message on the LCD display.

• Alarm LED flashes.

• Trip LED on.

• Ie>, Ue>>>> threshold LED on (if programmed).

• Trip output closes.

• Ie>, Ue>>>> threshold output closes (if programmed).

Delay type: Inverse time (IDMT)
Used thresholds for this test:

• Ie>, tIe>

• Supply the relay inject a current equal to 2 x Ie> threshold into one of the earth current
inputs. Repeat the operation for various current values (n x Ie threshold with n ranging
from 4 to 10, for example). Check that the values measured correspond to those
indicated in the table below (for TMS=1).
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IEC curves

Type of curve Tripping time (in seconds) for TMS =1

IEC 2 x I threshold 10 x I threshold
Nominal Min - Max Nominal Min - Max
STI 1.78 1.62 - 1.98 0.5 0.45 - 0.55
SI 10.1 9.1 - 11.1 3 2.7 - 3.3
VI 13.5 12.2 - 14.9 1.5 1.35 - 1.65
EI 26.7 24 - 29.5 0.8 0.72 - 0.88
LTI 120 108 - 132 13.3 12 - 14.6

IEEE/ANSI curves

Type of curve Tripping time (in seconds) for TMS =1

IEEE/ANSI 2 x I threshold 10 x I threshold
Nominal Min - Max Nominal Min - Max
STI 0.25 0.22 - 0.28 0.08 0.07- 0.09
MI 3.8 3.4 - 4.2 1.2 1.08 - 1.32
I 2.2 1.9 - 2.4 0.3 0.27 - 0.33
VI 7.2 6.5 - 8 0.7 0.63 - 0.77
EI 9.5 8.5 - 10.5 0.4 0.36 - 0.44

Checks:

• Ie> Alarm message on the LCD display.

• Alarm LED flashes.

• Trip LED on.

• Ie> threshold LED on (if programmed).

• Trip output closes.

• Ie> threshold output closes (if programmed).

4.3.2.2 Phase overcurrent I> threshold test (P126 & P127)
Phase overcurrent threshold check:

• If the time delay tI> is short, gradually increase the injection current up to the value of
the I> threshold.

• If the time delay tI> is long, inject 0.95 x I threshold and check that there is no tripping.
Then inject 1,1 x I threshold and check the trip.

• Gradually decrease the injected current and record the value of the drop out off (I>
threshold).
Commissioning and Maintenance P12y/EN CM/E95

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Checks:

• Alarm message on the LCD display.

• Alarm LED flashes.

• Trip LED on.

• I> threshold LED on (if programmed).

• Trip output closes.

• I> threshold output closes (if programmed).

Delay type: Definite time tI>

• Apply a current into one of the phases and measure the time delay tI> by pre-setting
the current above the I> threshold (I injected > 2 x I threshold).

• Apply a current onto one of the phases and measure the time delay tI> by pre-setting
the current above the I> threshold (I injected > 10 x I threshold).
Checks:

• Alarm message on the LCD display for I> after that the setting trip delay time is
expired.

• Alarm LED flashes > after that the setting trip delay time is expired.

• Trip LED on after that the setting trip delay time is expired.

• I> threshold LED on (if programmed) > after that the setting trip delay time is expired.

• Trip output closes > after that the setting trip delay time is expired.

• I> threshold output closes (if programmed) > after that the setting trip delay time is
expired.
Delay type: Inverse time (IDMT)
Used threshold for this test:

• I>, tI>

• Supply the relay, inject a current equal to 2 x I> threshold into one of the earth current
inputs. Repeat the operation for various current values (n x Ie threshold with n ranging
from 4 to 10, for example). Check that the values measured correspond to those
indicated in the table below (for TMS=1).
IEC curves

Type of curve Tripping time (in seconds) for TMS =1

IEC 2 x I threshold 10 x I threshold
Nominal Min - Max Nominal Min - Max
STI 1.78 1.62 - 1.98 0.5 0.45 - 0.55
SI 10.1 9.1 - 11.1 3 2.7 - 3.3
VI 13.5 12.2 - 14.9 1.5 1.35 - 1.65
EI 26.7 24 - 29.5 0.8 0.72 - 0.88
LTI 120 108 - 132 13.3 12 - 14.6
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IEEE/ANSI curves

Type of curve Tripping time (in seconds) for TMS =1

IEEE/ANSI 2 x I threshold 10 x I threshold
Nominal Min - Max Nominal Min - Max
STI 0.25 0.22 - 0.28 0.08 0.07- 0.09
MI 3.8 3.4 - 4.2 1.2 1.08 - 1.32
I 2.2 1.9 - 2.4 0.3 0.27 - 0.33
VI 7.2 6.5 - 8 0.7 0.63 - 0.77
EI 9.5 8.5 - 10.5 0.4 0.36 - 0.44

RI electromechanical curve

Type of curve Tripping time (in seconds) for K =1

Electromechanical 2 x I threshold 10 x I threshold
Nominal Min - Max Nominal Min - Max
RI 4.5 4-5 3.2 2.8 - 3.6

For other injected current values, compare the values found with the theoretical values
calculated according to the formula of the curves.
NOTE: Equations of IEC, IEEE/ANSI and RI curves are given in chapter
P12y/EN TD of this Technical Guide.
Checks:

• I> Alarm message on the LCD display.

• Alarm LED flashes.

• Trip LED on.

• I> threshold LED on (if programmed).

• Trip output closes.

• I> threshold output closes (if programmed).

4.3.2.3 Phase to phase (phase to neutral) over-voltage U> threshold (P127)
Phase overcurrent threshold check:

• If tU> time delay is short, gradually raise the injection voltage up to the value of U>
threshold.

• If U> time delay is long, inject 0.95 x U> threshold setting and check there is no trip.
Then inject 1.1 x U> threshold setting and check the trip output is close.

• Gradually lower the injected current and note the value of the drop out U> threshold.
Commissioning and Maintenance P12y/EN CM/E95

MiCOM P125/P126 & P127 Page 19/22

Checks:

• Alarm message on the LCD display for U> after that the setting trip delay time is
expired.

• Alarm LED flashes after that the setting trip delay time is expired.

• Trip LED on, after that the setting trip delay time is expired.

• U> threshold LED on (if programmed) > after that the setting trip delay time is expired.

• Trip output closes U> after that the setting trip delay time is expired..

• U> threshold output closes (if programmed) after that the setting trip delay time is
expired.
4.4 Final checks
1. Remove all test or temporary shorting leads, etc… If it is necessary to disconnect any
of the external wiring from the relay in order to perform the wiring verification tests, it
should be ensured that all connections are replace in accordance with the relevant
external connection or scheme diagram.
2. If a MMLG test block is installed, remove the MMLB01 test plug and replace the
MMLG cover so that the protection is put into service.
3. For MiCOM P126 and P127 models, ensure that all event, fault and disturbance
records, alarm and LEDs have been reset before leaving the relay.
4. If the relays are in a new installation or the circuit breaker has been just maintained,
the circuit breaker maintenance and current counters should be zero. These counters
(only P126 & P127) have to be reset using relevant command in RECORD/CB
Monitoring menu (refer to User Guide).
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5. MAINTENANCE
5.1 Equipment failure
MiCOM P125, P126 and P127 relays are full digital and permanent self-diagnosing. Any
failure of software or hardware elements is instantly detected. As soon as an internal fault is
detected, depending on its type (minor or major), an alarm message is displayed as a priority
on the front panel LCD before the fault LED is illuminated (fixed or flashing) and the
watchdog relay is closed (if the fault is a major one).
The watchdog facility provides two output relay contacts, one normally open and one
normally closed that are driven by the processor board. These are provided to give an
indication that the relay is in a healthy state.
An equipment failure (major or minor) cannot be acknowledged on the front panel (using the
dedicated tactile button keypad). Only the disappearance of the cause will acknowledge the
fault and hence reset the fault LED.
5.1.1 Minor fault
Regarded by the MiCOM P125, P126 and P127 relays as a minor fault is a communication
failure. If the communication is in fault, MiCOM P125, P126 and P127 protection and
automation modules are not affected.
Message:
"COMM.ERROR": Communication fault
Cause:
Hardware or software failure of the communication module.
Action:
Withdraw the active part and return it to the factory for repair.
Alternative:
If communication is not used, disable communication in the COMMUNICATION menu
(Communication ? = No).
5.1.2 Major fault
Major fault for MiCOM P125, P126 and P127 relays are all software and hardware failures
except the communication faults. As soon as this type of failure is detected, the watchdog
(WD) is closed and all operations are stopped (protection, automation, communication).
5.1.3 Hardware and software faults
Messages:
"DEFAULT SETTING": Indication that the relay is running with default setting
"SETTING ERROR": Failure in the setting
" CALIBRATION ERROR.": Calibration zone failure
"CT ERROR": Analogue channel failure
Cause:
Hardware or software failure
Action:
Restart the protection software.
If the software fault still remain after restart, withdraw the active part and return the module
to the factory for repair.
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MiCOM P125/P126 & P127 Page 21/22

5.2 Method of repair

5.2.1 Replacing the active part
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/E11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTIONS OF THE TECHNICAL MANUAL AND
ALSO THE RATINGS ON THE EQUIPMENT RATING LABEL.

The case and the rear terminals blocks have been designed to facilitate removal of the
MiCOM P12x relay should replacement or repair become necessary without disconnect the
scheme wiring.
NOTE: The MiCOM relays have integral current transformer shorting switches
which will close when the active part is removed from the case.
Remove the upper and lower flap without exerting excessive force. Remove the external
screws. Under the upper flap, turn the extractor with a 3 mm screwdriver and extract the
active part of the relay by pulling from the upper and lower notches on the front panel of the
MiCOM relay.
The reinstall the repaired or replacement relay follow the above instruction in reverse,
ensuring that no modification has been done on the scheme wiring.
5.2.2 Replacing the complete relay
To remove the complete relay (active part and case) the entire wiring must be removed from
the rear connector.
Before working at the rear of the relay, isolate all current supplies to the MiCOM relay and
ensure that the relay is no more powered.
WARNING: NEVER OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENT
TRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BE
LETHAL AND COULD DAMAGE INSULATION.
Remove all wiring (communication, logic inputs, outputs, auxiliary voltage, current inputs).
Disconnect the relay earth connection from the rear of the relay.
Remove the screws used to fasten the relay to the panel, rack, etc… .These are the screws
with the larger diameter heads that are accessible when the upper and lower flaps are open.
Withdraw the relay from the panel, rack, etc… carefully because it will be heavy due to the
internal transformers.
To reinstall the repaired or replacement relay follow the above instructions in reverse,
ensuring that each terminal block is relocated in the correct position and case earth,
communication are replaced.
Once reinstallation is complete the relay should be recommissioned using the instruction in
sections 1 to 4 inclusive of this chapter.
5.3 Problem solving
5.3.1 Password lost or not accepted
Problem:
Password lost or not accepted
Cause:
MiCOM P125, P126 and P127 relays are supplied with the password set to AAAA.
This password can be changed by the user (refer OP PARAMETERS menu).
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Action:
There is an additional unique recovery password associated to the relay which can be
supplied by the factory or service agent, if given details of its serial number (under the upper
flap of the front panel). With this serial number, contact your Schneider Electric local dealer
or Schneider Electric After Sales Dept.
5.3.2 Communication
5.3.2.1 Values measured locally and remotely
Problem:
The measurements noted remotely and locally (via RS485 communication) differ.
Cause:
The values accessible on the front face via the Measurement menu are refreshed every
second. Those fed back via the communication and accessible by the Schneider Electric
Setting software generally have skeletal refreshing frequencies. If the refreshing frequency of
the supervision software differs from that of MiCOM P125, P126 and P127 relays (1s), there
may be a difference between indicated values.
Action:
Adjust the frequency for refreshing the measurements of the supervision software or of the
setting software to 1 second.
5.3.2.2 MiCOM relay no longer responds
Problem:
No response from MiCOM P125, P126 and P127 relays when asked by the supervision
software without any communication fault message.
Cause:
Mainly, this type of problem is linked to an error in the MiCOM P125, P126 and P127
communication parameters.
Action:
Check MiCOM P125, P126 and P127 communication parameters (data rate, parity, etc.) are
in accordance with the supervision settings.
Check MiCOM P125, P126 and P127 network address.
Check that this address is not used by another device connected on the same LAN.
Check that the other devices on the same LAN answer to supervision requests.
5.3.2.3 A remote command is not taken in account
Problem:
The communication between the relay and the PC is correct, but the relay does not accept
any remote command or file downloading.
Cause:
Generally this is due to the fact that the relay is in programming situation. This means that
the password is active.
Action:
Check that the password is not active in the relay since the last 5 minutes.
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127

CONNECTIONS AND
WIRING DIAGRAMS
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 1/12

CONTENT

1. P125 REAR DESCRIPTION 3

1.1 P125 wiring diagram 4

2. P126 REAR DESCRIPTION 5

2.1 P126 wiring diagram 6

3. P127 REAR DESCRIPTION 7

3.1 P127 wiring diagram 8

4. P126 & P127 CURRENT INSERTION SCHEMES 10

4.1 P126 & P127 Holmgreen CT’s insertion 10
4.2 P126 & P127 Two phases CT’s insertion 11
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 2/12 MiCOM P125/P126 & P127

BLANK PAGE
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 3/12

1. P125 REAR DESCRIPTION

Case earth

1 2 29 30
3 4 31 32
5 6 33 34
7 8 35 36
9 10 37 38
11 12 39 40
13 14 41 42
15 16 43 44
17 18 45 46
19 20 47 48
21 22 49 50
23 24 51 52
25 26 53 54
27 28 55 56

Module terminal blocks

viewed from rear
(with integral case earth link)
P0071ENb

Output 5 1 2 Common output Case earth 29 30 Terminal

1 connection RS485
Common 3 4 Output 1 (NC) RS485 - 31 32 RS485 +
output 5
Output 6 5 6 Output1 (NO) Vaux + 33 34 Vaux –
Common 7 8 Common output Relay faulty 35 36 Common
output 6 2 "Watchdog"
9 10 Output 2 (NC) Relay healthy 37 38
11 12 Output 2 (NO) Residual volt. 39 40 Residual volt.
Input - Input +
13 14 Output 3 41 42
15 16 Common output 43 44
3
Input3 + 17 18 Output 4 45 46
Input3 – 19 20 Common output Current input 47 48 Current input
4 (5A) (5A)
Input4 + 21 22 Input1 + 49 50
Input4 – 23 24 Input1 – 51 52
25 26 Input2 + 53 54
27 28 Input2 – Current input 55 56 Current input
(1A) (1A)
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 4/12 MiCOM P125/P126 & P127

1.1 P125 wiring diagram

Scheme shows output relays off:

35
C B Watch Dog
Phase rotation ~/ + 33 WD 37
36
Auxiliary Voltage 4
A B C Programmable tripping output
~/ _ 34 RL1 6
2
10
Trip direction

P1 55 RL2 12
Programmable output
S1 8
1A 14
56 32N 50N 51N RL3 Programmable output
16
47 18
RL4 Programmable output
67N 59N 20
5A
48 3
RL5 Programmable output
1
7
RL6 Programmable output
5

MiCOM
A da 22
Programmable input L1
24
26
Programmable input L2

P125
B 28
17
Programmable input L3
19
21
C 40 Programmable input L4
23

N dn 39

Case earth connection

29 Communication cable shield
*
30 Terminal RS485

_ 31
RS485
Communication Port
+ 32
*terminating resistor for the last
relay to be connected between 30-32

P0074ENc
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 5/12

2. P126 REAR DESCRIPTION

Case earth

57 58 1 2 29 30
59 60 3 4 31 32
61 62 5 6 33 34
63 64 7 8 35 36
65 66 9 10 37 38
67 68 11 12 39 40
69 70 13 14 41 42
71 72 15 16 43 44
73 74 17 18 45 46
75 76 19 20 47 48
77 78 21 22 49 50
79 80 23 24 51 52
81 82 25 26 53 54
83 84 27 28 55 56

Module terminal blocks

viewed from rear
(with integral case earth link)
P0072ENb

Input 7 + 57 58 Input 6 + Output 5 1 2 Common Case earth 29 30 Terminal

output 1 connection RS485
Input 7 – 59 60 Input 6 – Common 3 4 Output 1 RS485 - 31 32 RS485+
output 5 (NC)
61 62 Output 6 5 6 Output1 Vaux + 33 34 Vaux –
(NO)
63 64 Common 7 8 Common Relay failed 35 36 Common
output 6 output 2 "Watchdog"
65 66 Common 9 10 Output 2 Relay 37 38
output 7 (NC) healthy
67 68 Output 7 11 12 Output 2 39 40
(NO)
Voltage 69 70 Voltage Common 13 14 Output 3 Current 41 42 Current input
input VA input VA output 8 input IA (5A) IA (5A)
Voltage 71 72 Voltage Output 8 15 16 Common Current 43 44 Current input
input VB input VB output 3 input IB (5A) IB (5A)
Voltage 73 74 Voltage Input 3 + 17 18 Output 4 Current 45 46 Current input
input VC/Vr input VC/Vr input IC(5A) IC(5A)
75 76 Input 3 – 19 20 Common Current 47 48 Current input
output 4 input Ie (5A) Ie(5A)
77 78 Input 4 + 21 22 Input 1 + Current 49 50 Current input
input IA (1A) IA (1A)
79 80 Input 4 – 23 24 Input 1 – Current 51 52 Current input
input IB (1A) IB (1A)
81 82 Input 5 + 25 26 Input 2 + Current 53 54 Current input
input IC(1A) IC(1A)
83 84 Input 5 – 27 28 Input 2 – Current 55 56 Current input
input Ie (1A) Ie(1A)
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 6/12 MiCOM P125/P126 & P127

2.1 P126 wiring diagram

Scheme represents relays off:

C B
Phase rotation
35
A B C 37
~/ + 33 WD
36
Auxiliary Voltage 4
~/ _ 34
P1 RL1 6
49 2
S1 10
1A 50 51 32N
50 RL2 12
P1 51 8
14
S1 51N RL3
1A 67N 50N 16
52 18
53 RL4
P1 20
37 46 49
S1 3
1A RL5
1
54
59N 79 BC
Trip direction

7
55 RL6
P1 5
S1 9
1A 50BF TCS RL7
56 11
13
41 RL8
15
5A 22
42
24 Programmable inputL1
43
26
5A Programmable inputL2
44 28
17
45
Programmable inputL3
19
5A 21
46

MiCOM
Programmable inputL4
23
47
25
5A Programmable inputL5
27

P126
48 58
Programmable inputL6
Ad a 60
57
Programmable inputL7
59

B
Case earth connection
29 Communication cable shield
30
C 73 Terminal RS485
_ 31
RS485
N dn 74 Communication
+ 32

P0075ENb
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 7/12

3. P127 REAR DESCRIPTION

Case earth

Module terminal blocks

viewed from rear
P0072ENc
(with integral case earth link)

Input 7 + 57 58 Input 6 + Output 5 1 2 Common Case earth 29 30 Terminal

output 1 connection RS485
Input 7 – 59 60 Input 6 – Common 3 4 Output 1 RS485 - 31 32 RS485+
output 5 (NC)
Input 8 61 62 Input COM(1) Output 6 5 6 Output1 Vaux + 33 34 Vaux –
(1)
+ terminal – terminal (NO)
Input A 63 64 Input 9 Common 7 8 Common Relay failed 35 36 Common
(1) (1)
+ terminal + terminal output 6 output 2 "Watchdog"
Input C 65 66 Input B Common 9 10 Output 2 Relay 37 38
(1) (1)
+ terminal + terminal output 7 (NC) healthy
(3) (3)
Current I1 67 68 Current I1 Output 7 11 12 Output 2 39 40
meas. 1A/5A meas. 1A/5A (NO)
Voltage 69 70 Voltage Common 13 14 Output 3 Current 41 42 Current input
input VA input VA output 8 input IA (5A) IA (5A)
Voltage 71 72 Voltage Output 8 15 16 Common Current 43 44 Current input
input VB input VB output 3 input IB (5A) IB (5A)
Voltage 73 74 Voltage Input 3 + 17 18 Output 4 Current 45 46 Current input
input VC/Vr input VC/Vr input IC(5A) IC(5A)
(3) (3)
Current I2 75 76 Current I2 Input 3 – 19 20 Common Current 47 48 Current input
meas. 1A/5A meas. 1A/5A output 4 input Ie (5A) Ie(5A)
Case earth 77 78 RS485-2 term. Input 4 + 21 22 Input 1 + Current 49 50 Current input
(2 (2)
connection Z input IA (1A) IA (1A)
RS485-2 79 80 RS485-2 Input 4 – 23 24 Input 1 – Current 51 52 Current input
(2) (2)
– terminal + terminal input IB (1A) IB (1A)
IRIG-B mod 81 82 IRIG-B mod Input 5 + 25 26 Input 2 + Current 53 54 Current input
(2) (2)
– terminal + terminal input IC(1A) IC(1A)
IRIG-B dem 83 84 IRIG-B dem Input 5 – 27 28 Input 2 – Current 55 56 Current input
(2) (2)
– terminal – terminal input Ie (1A) Ie(1A)
(1)
Available only for P127 “5 opto-inputs” option (product codes P127xx1 or P127xx3).
“Input COM – terminal” is the common terminal for inputs 8 to 12.
(2)
Available only for P127 “IRIG-B and 2nd rear port option” option (product codes P127xx2
or P127xx3).
The “81” and “82” terminals are used to connect the optional BNC adaptor. This one must
be plugged according to the “+” and “GND” positions marked on the adaptor.
(3)
With I1 = IA or IB or IC and I2 = IA or IB or IC. Available only for P127 with additional
measurement CT option (product codes P127xx4, P127xx5, P127xx6 or P127xx7).
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 8/12 MiCOM P125/P126 & P127

3.1 P127 wiring diagram

Scheme represents relays off:

Protection CT Measurement CT

Watchdog (4)

Output 1
Example with phases A
and B connected

Output 2

Output 3

Output 4

Output 5

Output 6

Output 7

Output 8

Input 1

Input 2

Input 3

Input 4

Input 5

Input 6

Input 7

Input 8

Input 9

Input 10

Input 11
50 51 67
Input 12

32N 50N 51N

67N 37 46

49 79 46BC

50BF TC S
Terminals "30/32" and "78/80" to
be connected at the end of
RS485 bus.
59 59N 27

81 81R 32

VTS 51V 86 BNC adaptor board

IRIG B
CTS
Modulated

= optional
IRIG B
Unmo-
dulated

P0076ENe
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 9/12

C
A
B
C
A
B
Measurement CT connection

C
A
B
(optional)

P3947ENb
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 10/12 MiCOM P125/P126 & P127

4. P126 & P127 CURRENT INSERTION SCHEMES

4.1 P126 & P127 Holmgreen CT’s insertion

Three phases CTs (IA, IB, IC) + residual current

by Holmgreen insertion

Auxiliary
voltage

Phase rotation

MiCOM
P126/P127
P0101ENa
Connections and Wiring Diagrams P12y/EN CO/E95

MiCOM P125/P126 & P127 Page 11/12

4.2 P126 & P127 Two phases CT’s insertion

Two phases CTs (IA, IC) + residual current insertion

Auxiliary
voltage

Phase rotation

MiCOM
P126/P127
P0102ENa
P12y/EN CO/E95 Connections and Wiring Diagrams

Page 12/12 MiCOM P125/P126 & P127

BLANK PAGE
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127

COMMISSIONING TEST
AND RECORD SHEET
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 1/68

CONTENT

1. COMMISSIONING TEST 5
1.1 Relay identification 5
1.2 Commissioning test record 5
1.3 Auxiliary supply control 5
1.4 Measurements and analogue inputs control 6
1.5 Phase overcurrent protection test 6
1.6 Phase under current protection test 7
1.7 Earth over current protection test 7
1.8 Directional earth fault overcurrent 8
1.9 Earth Fault Wattmetric protection test 9
1.10 Over/Under Phase voltage protection test 9
1.11 Residual voltage protection test 10
1.12 Autoreclose basic test 10
1.12.1 ARC test procedure with tI> 12
1.12.2 ARC test procedure with tIe> 12

2. COMMISSIONING RECORD SHEET 13

2.1 OP PARAMETERS Menu 13
2.2 CONFIGURATION menu 13
2.2.1 General options 13
2.2.2 Transfo. Ratio 14
2.2.3 LEDs 5 to 8 configuration 14
2.2.4 Inputs configuration 17
2.2.5 Output relays configuration 18
2.2.6 Group select configuration 18
2.2.7 Alarms configuration 18
2.3 COMMUNICATION menu 20
2.3.1 HMI communication 20
2.3.2 COMM1 communication 20
2.3.3 COMM2 communication 20
2.4 PROTECTION Menu 21
2.4.1 Phase overcurrent [(67/)50/51] 21
2.4.2 [67N] E/GND 23
2.4.3 [32] Directional power 26
2.4.4 [32N] Earth wattmetric 28
2.4.5 [46] Neg Seq OC 29
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 2/68 MiCOM P125/P126 & P127

2.4.6 [49] Thermal OL 30

2.4.7 [37] UNDERCURRENT I< 30
2.4.8 [59] Phase Over Voltage 30
2.4.9 [27] Phase Under Voltage 31
2.4.10 [59N] Residual overvoltage 31
2.4.11 [79] Autoreclose 32
2.4.12 Frequency [81] menu 33
2.4.13 Freq. rate of change [81R] menu 33
2.5 AUTOMAT. CTRL menu 34
2.5.1 Trip Commands 34
2.5.2 Latch relays 36
2.5.3 Blocking logic 1 function allocation 36
2.5.4 Blocking logic 2 function allocation 37
2.5.5 Inrush Blocking Logic function allocation 39
2.5.6 Logic Select 1 function allocation 39
2.5.7 Logic Select 2 function allocation 40
2.5.8 OUTPUT RELAYS allocation 41
2.5.9 LOGIC INPUT allocation 46
2.5.10 BROKEN CONDUCTOR allocation 47
2.5.11 COLD LOAD PU allocation 48
2.5.12 51V allocation 48
2.5.13 VTS allocation 49
2.5.14 CTS allocation 49
2.5.15 CB FAIL allocation 50
2.5.16 CIRCUIT BREAKER SUPERVISION allocation 50
2.5.17 SOTF 51
2.5.18 LOGIC EQUATIONS 51
2.5.19 Comm. Order delay 55
2.6 RECORDING MENU 56
2.6.1 CB MONITORING Record 56
2.6.2 FAULT RECORD Record 56
2.6.3 INSTANTANEOUS Record 57
2.6.4 DISTURB RECORD record 57
2.6.5 TIME PEAK VALUE 57
2.6.6 ROLLING DEMAND 57

3. P126 & P127 FURTHER TESTS 58

3.1 Introduction 58
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 3/68

3.2 Test equipment 58

3.3 Type used relay 58
3.4 Test configuration 58
3.5 Connections to test equipment 58
3.6 Test Overcurrent Protection 58
3.7 Non-directional overcurrent protection 59
3.7.1 Overcurrent sensitivity tests 59
3.7.2 Overcurrent characteristic tests 59
3.7.3 Non-directional earth fault overcurrent protection 60
3.7.4 Neutral characteristic tests 60
3.7.5 Directional earth fault overcurrent protection 61
3.7.6 Reset time test 62
3.7.7 Directional earth fault operating boundary 62
3.7.8 Neutral characteristic tests 63
3.7.9 Directionaloperating boundary – PHASE overcurrent (only P127) 63
3.7.10 Earth directional wattmetric test 64
3.7.11 Negative sequence overcurrent 65
3.7.12 Thermal overload 65
3.8 Voltage Protection (only P127) 65
3.8.1 Under voltage 65
3.8.2 Phase to neutral under voltage element 66
3.8.3 Over voltage 66
3.8.4 Phase to neutral over voltage element 66
3.8.5 Residual over voltage 66
3.9 Automatic control functions 67
3.9.1 Trip circuit supervision 67
3.9.2 Circuit breaker failure 67
3.9.3 Cold load pick-up 68
3.9.4 Broken Conductor 68
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 4/68 MiCOM P125/P126 & P127

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Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 5/68

1. COMMISSIONING TEST
BEFORE CARRYING OUT ANY WORK ON THE EQUIPMENT, THE
USER SHOULD BE FAMILIAR WITH THE CONTENTS OF THE SAFETY
GUIDE SFTY/4LM/D11 OR LATER ISSUE, OR THE SAFETY AND
TECHNICAL DATA SECTION OF THE TECHNICAL MANUAL AND ALSO
THE RATINGS ON THE EQUIPMENT RATING LABEL.

1.1 Relay identification

Commissioning date:
Engineer:
Substation:
Circuit:
Network nominal frequency:
MiCOM relay model: P125 P126 P127

Serial number:
Rated current In:
Rated current Ien:
Rated Voltage primary:
Rated Voltage secondary:
Auxiliary voltage Uaux:
Communication protocol:
Language:

1.2 Commissioning test record

(Put a cross after each checked stage)
Serial number check ?
All current transformer shorting switches closed ?
Wiring checked against diagram (if available)?
Case earth installed ?
Test block connections checked (if installed) ?
Insulation tested ?
1.3 Auxiliary supply control
Auxiliary voltage to relay
Auxiliary voltage value _________Vdc/Vac
Watchdog contacts
With auxiliary supply off Terminals 35 and 36
With auxiliary supply on Terminals 36 and 37
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 6/68 MiCOM P125/P126 & P127

1.4 Measurements and analogue inputs control

• Set the voltage wiring mode in CONFIGURATION/General options menu as 2Vpn+Vr.

• Set in the configuration menu in the submenu Transfo Ratio as shown below.

Line CT Line CT E/Gnd CT E/Gnd CT Line VT Line VT E/Gnd VT E/Gnd VT

primary secondary primary Secondary Primary secondary Primary Secondary
1 1 1 1 0.10 kV 100V 0.10 kV 100V

Phase Applied Current Measured value

Phase A: A IA: A
Phase B: A IB: A
Phase C: A IC: A

Earth Current Applied Measured value

Earth current: A IN: A

Phase Voltage Applied Measured value

Phase A: A UA: A
Phase B: A UB: A

Residual Voltage Applied Measured value

Residual Voltage: V UN: V

NOTE: The measured values are displayed in the Measurement submenu of

the involved relay.
1.5 Phase overcurrent protection test

Type and setting threshold Value Delay Time Trip value Drop value
in In applied in In Setting in In in In
I>: A 0.2 x I> 1s

Type and setting threshold Value Delay Time Measured Drop value in
in In applied in In Setting Trip Delay In
time
I>: A 2 x I> 1s

Type and setting threshold Value Delay Time Trip value in Drop value in
in In applied in In Setting In In
I>>: A 0.5x I>> 1s
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 7/68

Type and setting threshold Value Delay Time Measured Drop value in
in In applied in In Setting Trip Delay In
time
I>>: A 2.5x I>> 1s

Type and setting threshold Value Delay Time Trip value in Drop value in
in In applied in In Setting In In
I>>>: A 0.5xI>>> 1s s

Type and setting threshold Value Delay Time Measured Drop value in
in In applied in In Setting Trip Delay In
time
I>>>: A 2.5xI>>> 1s s

1.6 Phase under current protection test

Type and setting threshold Value Delay Time Trip value in Drop value in
in In applied in In Setting In In
I<: A 0.2 x I< 1s s s

Type and setting threshold Value Delay Time Measured Drop value in
in In applied in In Setting Trip Delay In
time
I<: A 0.2 x I< 1s s s

1.7 Earth over current protection test

Type and setting threshold Value Delay Time Trip value in Drop value in
in Ien applied in Ien Setting In In
Ie>: 0.2 x Ie> 1s

Type and setting threshold Value Delay Time Measured Drop value in
in Ien applied in Ien Setting Trip Delay In
time
Ie>: 2 x Ie> 1s

Type and setting threshold Value Delay Time Trip value in Drop value in
in Ien applied in Ien Setting In In
Ie>>: 0.2x Ie>> 1s

Type and setting threshold Value Delay Time Measured Drop value in
in Ien applied in Ien Setting Trip Delay In
time
Ie>>: 2 x Ie>> 1s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 8/68 MiCOM P125/P126 & P127

Type and setting threshold Value Delay Time Trip value in Drop value in
in Ien applied in Ien Setting In In
Ie>>>: 0.5 x Ie>>> 1s

Type and setting threshold Value Delay Time Measured Drop value in
in Ien applied in Ien Setting Trip Delay Ien, Ue, R
time
Ie>>>: 2 x Ie>>> 1s

1.8 Directional earth fault overcurrent

The setting range depends on the sensitivity of the relay type.
However the setting value is expressed in Ien and this one bypasses the problem.
The test is proposed for the first stage, but using the same values can be executed for the
others stages two stages.
Below it is listed the guide table.

Type and setting current stage Value Delay Time Measured Drop value
in Ien, Ue> in Volt, in degrees for applied in In, Setting Trip Delay for Ien, Ue,
the torque angle and the trip zone in Volt and time Torque
the angles in angle, and
degrees trip zone
Ie>: 0.5 x Ie>
Ue>:10V 2 x 10V
1s
Torque angle: 0° 0°
Trip Zone: +/- 90° +/-85°
Type and setting current stage Value Drop value
in Ien, the Ue> in Volt and in applied in In, Measured for Ien, Ue,
Delay Time
degrees the torque angle and the in Volt and Trip Delay Torque
Setting
trip zone the angles in time angle, and
degrees trip zone
Ie>: 2 x Ie>
Ue>:10V 80V
1s
Torque angle: 0° 0°
Trip Zone: +/- 90° +/-85°
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 9/68

1.9 Earth Fault Wattmetric protection test

The earth fault wattmetric protection can be tested but as above needs of the residual
voltage injection the wattmetric power is calculated as Ie x Ue x cos (Ie^Ue+ϕc).
The calculation is referred to the secondary values.
The same test can be repeated for the second stage.

Type and setting Pe stage are in Value Delay Time Measured Drop value
watt referred to the secondary. applied in In, Setting Trip Delay for Ien, Ue,
The setting value depends on the in Volt and time Torque
set nominal Ien current (1A). the angles in angle, and
degrees trip zone
0.5 x
Ien=0.5A
Pe>: 20W
Ue=45V
tPe>=1s
Ue^Ie =0°

ϕc = 0°
Note: Change the angle between Ue^Ie and verify the trip and drop off of the Pe stage and
the value of the Pe in the measurement menu.

1.10 Over/Under Phase voltage protection test

Value
Type and setting threshold Delay Time Trip value in Drop value in
applied in
in Volt Setting Volt Volt
Volt
U>: 2xU> 1s

Value Measured
Type and setting threshold Delay Time Drop value in
applied in Trip Delay
in Volt Setting Volt
Volt time
U>: 2xU> 1s

Value
Type and setting threshold Delay Time Trip value in Drop value in
applied in
in Volt Setting Volt Volt
Volt
U<: 0.2 x U < 1s

Value Measured
Type and setting threshold Delay Time Drop value in
applied in Trip Delay
in Volt Setting Volt
Volt time
U<<: 0.2 x U << 1s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 10/68 MiCOM P125/P126 & P127

1.11 Residual voltage protection test

Value
Type and setting threshold Delay Time Trip value in Drop value in
applied in
in Volt Setting Volt Volt
Volt
Ue>>>>: 2 x Ue>>>> 1s

Value Measured
Type and setting threshold Delay Time Drop value in
applied in Trip Delay
in Volt Setting Volt
Volt time
Ue>>>>: 2 x Ue>>>> 1s

1.12 Autoreclose basic test

From the 6A firmware version the ARC function follows the other ones of the Px20 range.
The testing of this functionality requires a bit attention and some more setting.
Below the setting table and the test procedure is listed.

MENU TEXT SET FOR THE TEST

PROTECTION G1
[67] Phase OC
I> Yes
I> 1 In
Delay type DMT
tI> 1 sec
I>> Yes
I>> 2 In
Delay DMT
tI>> 1 sec
I>>> No
[67N] E/GND
Ie> Yes
Ie> 1 In
Delay type DMT
tIe> 1 sec
tReset 0,04s
Ie>> and Ie>>> No
AUTORECLOSE
Autoreclose? YES
Ext CB Fail? NO
Ext Block? NO
tD1 5 sec
tD2 5 sec
tD3 5 sec
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 11/68

MENU TEXT SET FOR THE TEST

tD4 5 sec
Reclaim Time tR 10 sec
Inhibit Time tI 0.2 sec
Phase Cycles 4
E/Gnd Cycles 4
Cycles 4321
tI> 1111
Cycles 4321
tI>> 0000
Cycles 4321
tI>>> 0000
Cycles 4321
tIe> 2222
Cycles 4321
tIe>> 0000
Cycles 4321
tIe>>> 0000
Cycles 4321
tPe/Iecos>, 0000
Cycles 4321
tPe/Iecos>> 0000
Cycles 4321
tAux1 0000
Cycles 4321
tAux2 0000

In the below table are listed the setting to have a corrected functionality of the 79 function.
The output relay, the digital input and the led assigne are free.
The indicating setting are those used for internal test.
In the output relay none other functionality can be assigned to the relay CB Close.

AUTOMATIC CTRL MENU SET FOR THE TEST

Output relay
CB Close relay 2
TRIP 79 relay 8
79 Run relay 7
Inputs menu
52a input 1
Trip Command
tI> Yes
tIe> Yes
All the other ones No
Configuration menu
LED
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 12/68 MiCOM P125/P126 & P127

AUTOMATIC CTRL MENU SET FOR THE TEST

I>
Led 5
Ie>
tI>
Led 6
tIe>
Led 7 Recl. Blocked
Led 8 Recl Run

NOTE: To execute the ARC test you have to connect an external relay for the
monitoring the CB status (52a OFF when the CB is open, ON when
CB is closed). Further the flowing of the current to the relay must be
interrupted when the 52a is OFF; CB is open.
1.12.1 ARC test procedure with tI>

− Close the CB and inject current the led 7 lights for 0.2 s,

− After 1 sec the CB open tD1 start the led 8 lights,

− After 5 seconf the CB closes and start tR,

− After 1 sec. The CB open and td 2 start,

− …………………………………….

− When we are to the td 4 when the CB close and after 1 sec the tI> trip the 79 trip and
Recl Blocked will be actived. 4 shots was done.
1.12.2 ARC test procedure with tIe>

− Close the CB and inject the Ie current, the led 7 lights for 0.2 s,

− After 1 sec the CB does not open and tDx does not start none led will be light,
This result is corrected because to the Ie was imposed the setting “2”.

Commissioning Engineer:
Date:

Remarks
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 13/68

2. COMMISSIONING RECORD SHEET

2.1 OP PARAMETERS Menu

Password:
Reference:
Software version:

Frequency: 50 Hz 60 Hz

2.2 CONFIGURATION menu

2.2.1 General options

VT connection 3Vpn 2Vpp + Vr 2Vpn + Vr

VT connection Not available Modulated Unmodulated
VT Protection Protect P-N Protect P-P
Phase rotation A-B-C A-C-B
CTm1 phase ? (P127) None IA IB IC
CTm2 phase ? (P127) None IA IB IC
CTm3 phase ? (P127) None IA IB IC

Default Displays RMS IA RMS IB RMS IC

(P126/P127) RMS IN RMS IA IB IC IN
Earth Text (P125) N o E
Phases/Eath Text
L1 L2 L3 N ABCo RSTE
(P126 / P127)
Iam Tdd denom (P127) A
Ibm Tdd denom (P127) A
Icm Tdd denom (P127) A
Prot. Freq. Block V
dF/dt Cycles.nb. (P127)
dF/dt Validat.nb= (P127)
Inh.Block dF/dt >20 Hz/s
Yes No
(P127)
Time Synchro. Not available (Cortec code P127--2 or P127--3---- only)
IRIG-B COMM2
COMM1 Automatic
IRIG-B Modulated Demodulated Not applicable
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 14/68 MiCOM P125/P126 & P127

2.2.2 Transfo. Ratio

• = available with this

P125

P126

P127
model.
O = Optional
Line CT Primary • • A
Line CT Secondary • • 1A 5A

E/Gnd CT Primary • • • A
E/Gnd CT Secondary • • • 1A 5A

Line VT primary • V
Line VT sec • V
E/Gnd VT primary • • • V Not visible
E/GNnd VT secondary • • • V Not visible
Line CTm primary • A Not visible
Line CTm sec • A Not visible

2.2.3 LEDs 5 to 8 configuration

• = available with this model.

O = Optional

LED 5 LED 6 LED 7 LED 8

P125

P126

P127

Functions
Yes Yes Yes Yes
I> • •

tI> • •

I>> • •

tI>> • •

I>>> • •

tI>>> • •

tIA> • •

tIB> • •

tIC> • •

Ie> • • •

tIe> • • •

Ie>> • • •

tIe>> • • •

Ie>>> • • •

tIe>>> • • •

Ie>>>> •

tIe>>>> •

P> •

tP> •
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 15/68

LED 5 LED 6 LED 7 LED 8

P125

P126

P127
Functions
Yes Yes Yes Yes
P>> •

tP>> •

P< •

tP< •

P<< •

tP< •

Q> •

tQ> •

Q>> •

tQ>> •

Q< •

tQ< •

Q<< •

tQ< •

Pe/IeCos> • • •

tPe/IeCos> • • •

Pe/IeCos>> • • •

tPe/IeCos>> • • •

I2> • •

tI2> • •

I2>> • •

tI2>> • •

I2>>> • •

tI2>>> • •

Therm. Trip • •

I< • •

tI< • •

U> •

tU> •

U>> •

tU>> •

U< •

tU< •

U<< •

tU<< •

Ue>>>> • • •
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 16/68 MiCOM P125/P126 & P127

LED 5 LED 6 LED 7 LED 8

P125

P126

P127
Functions
Yes Yes Yes Yes
tUe>>>> • • •

F1 •

tF1 •

F2 •

tF2 •

F3 •

tF3 •

F4 •

tF4 •

F5 •

tF5 •

F6 •

tF6 •

F Out •

dF/dt1 •

dF/dt2 •

dF/dt3 •

dF/dt4 •

dF/dt5 •

dF/dt6 •

F. out •

Brkn. Cond • •

CB Fail • •

VTS •

CTS •

Input 1 • • •

Input 2 • • •

Input 3 • • •

Input 4 • • •

Input 5 • •

Input 6 • •

Input 7 •

Input 8 O
Input 9 O
Input A O
Input B O
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 17/68

LED 5 LED 6 LED 7 LED 8

P125

P126

P127
Functions
Yes Yes Yes Yes
Input C O
79 Run • •

79i Blocked • •

79e. Blocked • •

tAux1 • • •

tAux2 • • •

tAux3 • •

tAux4 • •

tAux5 •

tAux6 •

tAux7 •

tAux8 O
tAux9 O
tAuxA O
tAuxB O
tAuxC O
tSOTF • •

tEQU. A • • •

tEQU. B • • •

tEQU. C • • •

tEQU. D • • •

tEQU. E • • •

tEQU. F • • •

tEQU. G • • •

tEQU. H • • •

2.2.4 Inputs configuration

= ↓, =↑
Inputs (P125 only) 3 2 1

Inputs (P126 and P127) 7 6 5 4 3 2 1

Inputs (P127 with 12 C B A 9 8

inputs configuration)

Voltage input DC DC AC
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 18/68 MiCOM P125/P126 & P127

2.2.5 Output relays configuration

← P125 →

← P126 & P127 →

8 7 6 5 4 3 2 1
Fail Safe Relay

Maintenance Mode YES NO

← P125 →

← P126 & P127 →

Relays 8 7 6 5 W 4 3 2 1
CMD
P122 and P123 only

2.2.6 Group select configuration

Change group Input Menu

Setting group 1 2
(P125/P126)
Setting Group (P127)
Target group (P127)
Group if low level (P127)
Group if high level
(P127)

2.2.7 Alarms configuration

Inst. Self Reset YES NO

Reset Led on fault YES NO

P125 P126 P127

Inhibited alarms
YES YES YES
Ctrl_Trip ?
tI< ?
tU< ?
tP< ?
tP<< ?
tQ< ?
tQ<< ?
F1
F2
F3
F4
F5
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 19/68

P125 P126 P127

Inhibited alarms
YES YES YES
F6
[79] ext. blk ?
tAux 1
tAux 2
tAux 3
tAux 4
tAux 5
tAux 6
tAux 7
tAux 8 (option)
tAux 9 (option)
tAux A (option)
tAux B (option)
tAux C (option)
Equ A
Equ B
Equ C
Equ D
Equ E
Equ F
Equ G
Equ H
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 20/68 MiCOM P125/P126 & P127

2.3 COMMUNICATION menu

2.3.1 HMI communication

HMI ? YES NO
Relay address
HMI ? Private IEC

2.3.2 COMM1 communication

COMM1 ? YES NO
Baud rate
Parity Even Odd None
Stop bits 0 1
Relay address
Spont. event & GI A11 None Private only
IEC only All
GI select. Basic Advanced
Measur. upload ASDU YES NO
3.4
Measur. upload ASDU 9 YES NO
Measur. upload Other YES NO
Events + Measur. YES NO
Blocking
Command Blocking YES NO
Command timeout s

2.3.3 COMM2 communication

COMM1 ? YES NO
Baud rate
Parity Even Odd None
Stop bits 0 1
Relay address
Spont. event & GI A11 None Private only
IEC only All
GI select. Basic Advanced
Measur. upload ASDU YES NO
3.4
Measur. upload ASDU 9 YES NO
Measur. upload Other YES NO
Events + Measur. YES NO
Blocking
Command Blocking YES NO
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 21/68

2.4 PROTECTION Menu

For several groups with different settings, copy this section.

G1 G2 G3 G4 G5 G6 G7 G8

Group copied from

Group copied to

2.4.1 Phase overcurrent [(67/)50/51]

2.4.1.1 [(67/)50/51] I>

Yes DIR (P127) No:

I> ?
Next menu: I>> ?
I> In
I> Torque ° Not displayed
I> Trip Zone ° Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT

2.4.1.1.1 [(67/)50/51] I> = DMT

tI> s

2.4.1.1.2 [(67/)50/51] I> = RI

K
t Reset s
I> >> >>> Interlock Yes No

2.4.1.1.3 [(67/)50/51] I> = IEC, RECT, CO or IEEE

TMS
Reset Delay Type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed
I> >> >>> Interlock Yes No
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 22/68 MiCOM P125/P126 & P127

2.4.1.2 [(67/)50/51] I>>

Yes DIR (P127) No:

I>> ?
Next menu: I>>> ?
I>> In
I>> Torque ° Not displayed
I>> Trip Zone ° Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT

2.4.1.2.1 [(67/)50/51] I>> = DMT

tI> s

2.4.1.2.2 [(67/)50/51] I>> = RI

K
t Reset s

2.4.1.2.3 [(67/)50/51] I>> = IEC, RECT, CO or IEEE

TMS
Reset Delay Type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed

2.4.1.3 [(67/)50/51] I>>>

I>>>? YES DIR (P127)

PEAK NO (last menu)
I>>> Torque ° Not displayed
I>>> Trip Zone ° Not displayed
I>>> In
tI>>> s
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 23/68

2.4.2 [67N] E/GND

2.4.2.1 [67N] Ie>

Yes DIR NO:

Ie> ? Next menu: I >> ?
e

Ie> Ien
Ue> V Not displayed
Ie> Torque ° Not displayed
Ie> Trip Zone ° Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT

2.4.2.1.1 [67N] Ie> = DMT

tIe> s
tReset s

2.4.2.1.2 [67N] Ie> = RI

K
t Reset s
Ie> >> >>> Interlock Yes No

2.4.2.1.3 [67N] Ie> = IEC, RECT, CO or IEEE

TMS
Reset Delay Type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed
Ie> >> >>> Interlock Yes No
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 24/68 MiCOM P125/P126 & P127

2.4.2.2 [67N] Ie>>

Yes DIR No:

Ie>> ?
Next menu: Ie>>>?
Ie>> Ien
Ue >> V Not displayed

Ie>> Torque ° Not displayed

Ie>> Trip Zone ° Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT

2.4.2.2.1 [67N] Ie>> = DMT

tIe> s
tReset s

2.4.2.2.2 [67N] Ie>> = RI

K
t Reset s

2.4.2.2.3 [67N] Ie>> = IEC, RECT, CO or IEEE

TMS
Reset Delay Type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed

2.4.2.3 [67N] Ie>>>

Ie>>>? YES DIR

PEAK NO (last menu)
Ie>>> In
Ue>>> V Not displayed
Ie>>> Torque ° Not displayed
Ie>>> Trip Zone ° Not displayed
tIe>>> s
tReset s
2.4.2.4 [67N] Ie>>>>

Ie>>>> ? Yes DIR No:

Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 25/68

Next menu: Ie>>>?

Ie>>>> Ien
Ue >> V Not displayed

Ie>>>> Torque ° Not displayed

Ie>>>> Trip Zone ° Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT

2.4.2.4.1 [67N] Ie>>>> = DMT

tIe> s
tReset s

2.4.2.4.2 [67N] Ie>>>> = RI

K
t Reset s

2.4.2.4.3 [67N] Ie>>>> = IEC, RECT, CO or IEEE

TMS
Reset Delay Type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 26/68 MiCOM P125/P126 & P127

2.4.3 [32] Directional power

Relay: P125 (not available)

Relay: P126 (not available)

P>? YES NO: next menu P>> ?

P> x W Not displayed
Directional Angle ° Not displayed
tP> s Not displayed

P>? YES NO: last menu

P> x W Not displayed
Directional Angle ° Not displayed
tP> s Not displayed

Q>? YES NO: next menu P>> ?

Q> x W Not displayed
Directional Angle ° Not displayed
tQ> s Not displayed

Q>? YES NO: last menu

Q> x W Not displayed
Directional Angle ° Not displayed
tQ> s Not displayed

P<? YES NO: next menu P<< ?

P< x W Not displayed
Directional Angle ° Not displayed
tP< s Not displayed

P<? YES NO: last menu

P< x W Not displayed
Directional Angle ° Not displayed
tP< s Not displayed
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 27/68

Q<? YES NO: next menu P<< ?

Q< x W Not displayed
Directional Angle ° Not displayed
tQ< s Not displayed

Q<? YES NO: last menu

Q< x W Not displayed
Directional Angle ° Not displayed
tQ< s Not displayed
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 28/68 MiCOM P125/P126 & P127

2.4.4 [32N] Earth wattmetric

Relay: P125 (not available)

[32N] mode Pe Ie Cos

Pe>? or NO:
IeCos> ? YES
Next menu P>>??/IeCos>>??
Pe> or IeCos> Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT
tPe> or tIeCos> s Not displayed
K Not displayed
TMS Not displayed
Reset delay type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed

Pe>>? or
IeCos>> ? YES NO: Last menu

tPe>> or s Not displayed

tIeCos>>
tReset s Not displayed
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 29/68

2.4.5 [46] Neg Seq OC

Relay: P125 (not available)

[32N] mode Pe Ie Cos

I2> ? YES NO: Next menu I2>>?
I2> In Not displayed

Delay Type DMT RI

IEC-STI IEC SI
IEC VI IEC-EI
IEC-LTI CO2
IEEE-MI CO8
IEEE-VI IEEE-EI
RECT
tI2> s Not displayed
K Not displayed
TMS Not displayed
Reset delay type DMT IDMT Not displayed
Rtms Not displayed
tReset s Not displayed

I2>> ? NO:
YES
Next menu I2>>>?
I2>> In Not displayed
tI2>> S Not displayed

I2>>> ? YES NO: Last menu

I2>>> In Not displayed
tI2>>> s Not displayed
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 30/68 MiCOM P125/P126 & P127

2.4.6 [49] Thermal OL

Relay: P125 (not available)

Therm OL ? YES NO: Last menu

Iθ > In
Te mn
K
θ Trip
θ Alarm ? YES NO: Last menu
θ Alarm %

2.4.7 [37] UNDERCURRENT I<

Relay: P125 (not available)

I< ? YES NO
I< In
tI< s
Inhibition I< on 52A YES NO
Inhibition I< on U< (P127) YES NO
Inhibition I< on U< (P127) V

2.4.8 [59] Phase Over Voltage

Relay: P125 (not available)

Relay: P126 (not available)

AND OR No:
U> ?
Next menu: U>>?
U> V Not displayed
tU> s Not displayed

AND OR No:
U>> ?
Last menu
U>> V Not displayed
tU>> s Not displayed
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 31/68

2.4.9 [27] Phase Under Voltage

Relay: P125 (not available)

Relay: P126 (not available)

AND OR No:
U< ?
Next menu: U>>?
U< V Not displayed
tU< s Not displayed
52a Inhib. U< ? AND OR Not displayed

AND OR No:
U<< ?
Last menu
U<< V Not displayed
tU<< s Not displayed
52a Inhib. U<< ? AND OR Not displayed

2.4.10 [59N] Residual overvoltage

Ue>>>> ? YES NO: Last menu

Ue>>>> V Not displayed
t Ue>>>> s Not displayed
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 32/68 MiCOM P125/P126 & P127

2.4.11 [79] Autoreclose

Relay: P125 (not available)

[79] Autoreclose ? NO
YES
Last menu

Ext CB Fail ? NO
YES
Next menu: Ext Block?
Ext CB Fail Time ms
Ext Block ? YES NO
Rolling demand ? YES NO
Max cycle nb
Time period mn
Dead Time tD1 s
Dead Time tD2 s
Dead Time tD3 s
Dead Time tD4 s
Dead Time tI> s
Dead Time tI>> s
Dead Time tI>>> s
Dead Time tIe> s
Dead Time tIe>> s
Dead Time tIe>>> s
Reclaim time tR s
Inhib Time tI s
Phase Cycles 1 2 3 4

E/Gnd Cycles 1 2 3 4

Cycles
4 3 2 1

tI>

tI>>

tI>>>

tIe>

tIe>>

tIe>>>

tPe/IeCos>

tPe/IeCos>>

tAux 1

tAux 2
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 33/68

2.4.12 Frequency [81] menu

Relay: P125 (not available)

Relay: P126 (not available)

Fx Fx = tFx
No 81> 81< Hz * ms *
[81] F1 _______ _______

[81] F2 _______ _______

[81] F3 _______ _______

[81] F4 _______ _______

[81] F5 _______ _______

[81] F6 _______ _______

2.4.13 Freq. rate of change [81R] menu

Relay: P125 (not available)

Relay: P126 (not available)

dF/dtx ? dF/dtx =
Yes Hz/s*
[81R] dF/dt1 _______

[81R] dF/dt2 _______

[81R] dF/dt3 _______

[81R] dF/dt4 _______

[81R] dF/dt5 _______

[81R] dF/dt6 _______

P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 34/68 MiCOM P125/P126 & P127

2.5 AUTOMAT. CTRL menu

2.5.1 Trip Commands

P125 P126 P127

Function
Yes Yes Yes
Trip tI>

Trip tI>>

Trip tI>>>

Trip tIe>
Trip tIe>>
Trip tIe>>>
Trip tIe>>>

Trip tP>

Trip tP>>

Trip tP<

Trip tP<<

Trip tQ>

Trip tQ>>

Trip tQ<

Trip tQ<<

Trip tPe/IeCos>
Trip tPe/IeCos>>
Trip tI2>

Trip tI2>>

Trip tI2>>>

Trip Thermal θ
Trip tU>

Trip tU>>

Trip tU<

Trip tU<<

Trip tUe>>>>
Trip tF1

Trip tF2

Trip tF3

Trip tF4

Trip tF5

Trip tF6
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 35/68

P125 P126 P127

Function
Yes Yes Yes
Trip dF/dt1

Trip dF/dt2

Trip dF/dt3

Trip dF/dt4

Trip dF/dt5

Trip dF/dt6

Trip Brkn. Cond

Trip tAux 1
Trip tAux 2
Trip tAux 3
Trip tAux 4
Trip tAux 5

Trip tAux 6

Trip tAux 7

Trip tAux 8 (option)

Trip tAux 9 (option)

Trip tAux A (option)

Trip tAux B (option)

Trip tAux C (option)

Trip SOTF

Ctrl Trip
Trip tEQU A
Trip tEQU B
Trip tEQU C
Trip tEQU D
Trip tEQU E
Trip tEQU F
Trip tEQU G
Trip tEQU H
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 36/68 MiCOM P125/P126 & P127

2.5.2 Latch relays

← P125 →

← P126 & P127 →

8 7 6 5 4 3 2 1
Latch relays

2.5.3 Blocking logic 1 function allocation

P125 P126 P127

Function
Yes Yes Yes
tI>
tI>>
tI>>>
tIe>
tIe>>
tIe>>>
tP>
tP>>
tP<
tP<<
tQ>
tQ>>
tQ<
tQ<<
tPe/IeCos>
tPe/IeCos>>
tI2>
tI2>>
tI2>>>

tThermal θ
tI<
tU>
tU>>
tU<
tU<<
tUe>>>>
tF1
tF2
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 37/68

P125 P126 P127

Function
Yes Yes Yes
tF3
tF4
tF5
tF6
tBrk. Cond
tAux1
tAux2
tAux3
tAux4
tAux5
tAux6
tAux7
tAux8 (option)
tAux9 (option)
tAuxA (option)
tAuxB (option)
tAuxC (option)

2.5.4 Blocking logic 2 function allocation

P125 P126 P127

Function
Yes Yes Yes
tI>
tI>>
tI>>>
tIe>
tIe>>
tIe>>>
tP>
tP>>
tP<
tP<<
tQ>
tQ>>
tQ<
tQ<<
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 38/68 MiCOM P125/P126 & P127

P125 P126 P127

Function
Yes Yes Yes
tPe/IeCos>
tPe/IeCos>>
tI2>
tI2>>
tI2>>>

tThermal θ
tI<
tU>
tU>>
tU<
tU<<
tUe>>>>
tF1
tF2
tF3
tF4
tF5
tF6
dF/dt1
dF/dt2
dF/dt3
dF/dt4
dF/dt5
dF/dt6
tBrk. Cond
tAux1
tAux2
tAux3
tAux4
tAux5
tAux6
tAux7
tAux8 (option)
tAux9 (option)
tAuxA (option)
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 39/68

P125 P126 P127

Function
Yes Yes Yes
tAuxB (option)
tAuxC (option)

2.5.5 Inrush Blocking Logic function allocation

Relay: P125 (not available)

P126 (not available)

Blocking Inrush YES NO

Inr. harmonic 2 ratio = %
T Inrush reset ms

P123
Function
Yes
I>
I>>
I>>>
Ie>
Ie>>
Ie>>>
Ie>>>>
I2>
I2>>
I2>>>

2.5.6 Logic Select 1 function allocation

Relay: P125 (not available)

Sel1 tI>> YES NO

Sel1 tI>>> YES NO
Sel1 tIe>> YES NO
Sel1 tIe>>> YES NO
Sel1 tIe>>>> YES NO
t Sel1 ms
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 40/68 MiCOM P125/P126 & P127

2.5.7 Logic Select 2 function allocation

Relay: P125 (not available)

Sel1 tI>> YES NO

Sel1 tI>>> YES NO
Sel1 tIe>> YES NO
Sel1 tIe>>> YES NO
Sel1 tIe>>>> YES NO
t Sel2 ms
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 41/68

2.5.8 OUTPUT RELAYS allocation

• = available ← P125 →
O = Option (P127) ← P126 / P127 →
RL2 RL3 RL4 RL5 RL6 RL7 RL8

P125

P126

P127
Function
Yes Yes Yes Yes Yes Yes Yes
Trip • •
I> • •
tI> • •
I_R> • •
I>> • •
tI>> • •
I_R>> • •
I>>> • •
tI>>> • •
I_R>>> • •
tIA> • •
tIB> • •
tIC> • •
Ie> • • •
tIe> • • •
Ie_R> • • •
Ie>> • • •
tIe>> • • •
Ie_R>> • • •
Ie>>> • • •
tIe>>> • • •
Ie>>>> •
tIe>>>> •
Ie_R>>> • • •
P> •
tP> •
P>> •
tP>> •
P< •
tP< •
P<< •
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 42/68 MiCOM P125/P126 & P127

• = available ← P125 →
O = Option (P127) ← P126 / P127 →
RL2 RL3 RL4 RL5 RL6 RL7 RL8

P125

P126

P127
Function
Yes Yes Yes Yes Yes Yes Yes
tP<< •
Q> •
tQ> •
Q>> •
tQ>> •
Q< •
tQ< •
Q<< •
tQ<< •
Pe/IeCos> • • •
tPe/IeCos> • • •
Pe/IeCos>> • • •
tPe/IeCos>> • • •
I2> • •
tI2> • •
I2>> • •
tI2>> • •
I2>>> • •
tI2>>> • •
ThermAlarm • •
ThermTrip • •
I< • •
tI< • •
U> •
tU> •
U>> •
tU>> •
U< •
tU< •
U<< •
tU<< •
Ue>>>> • • •
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 43/68

• = available ← P125 →
O = Option (P127) ← P126 / P127 →
RL2 RL3 RL4 RL5 RL6 RL7 RL8

P125

P126

P127
Function
Yes Yes Yes Yes Yes Yes Yes
tUe>>>>: • • •
F1 •
tF1 •
F2 •
tF2 •
F3 •
tF3 •
F4 •
tF4 •
F5 •
tF5 •
F6 •
tF6 •
F.OUT •
dF/dt1 •
dF/dt2 •
dF/dt3 •
dF/dt4 •
dF/dt5 •
dF/dt6 •
BrknCond • •
CBAlarm • •
52 Fail • •
CBFail • •
CB Close • •
tAux1 • • •
tAux2 • • •
tAux3 • • •
tAux4 • • •
tAux5 •

tAux6 •

tAux7 •
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 44/68 MiCOM P125/P126 & P127

• = available ← P125 →
O = Option (P127) ← P126 / P127 →
RL2 RL3 RL4 RL5 RL6 RL7 RL8

P125

P126

P127
Function
Yes Yes Yes Yes Yes Yes Yes
tAux8 O
tAux9 O
tAuxA O
tAuxB O
tAuxC O
79 Run • •
79 Trip • •
79 int. Lock • •
79 ext. Lock • •
SOTF • •
CONTROLTRIP • • •
CONTROLCLOSE • • •
ActiveGroup • • •
Input1 : • • •
Input2 • • •
Input3 : • • •
Input4 • • •
Input5 • •
Input6 • •
Input7 • •
Input8 O
Input8 O
InputA O
InputB O
InputC O
VTS •
CTS •
t EQU.A • •
t EQU.B • •
t EQU.C • •
t EQU.D • •
t EQU.E • •
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 45/68

• = available ← P125 →
O = Option (P127) ← P126 / P127 →
RL2 RL3 RL4 RL5 RL6 RL7 RL8

P125

P126

P127
Function
Yes Yes Yes Yes Yes Yes Yes
t EQU.F • •
t EQU.G • •
T EQU.H • •
Command1 •
Command2 •
Command3 •
Command4 •
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 46/68 MiCOM P125/P126 & P127

2.5.9 LOGIC INPUT allocation

2.5.9.1 Inputs

• = available ← P125 →
O = Option. ← P126 / P127 → ← option P127 →
Inputs

P125

P126

P127
Function
1 2 3 4 5 6 7 8 9 A B C
None • • •
Unlatch • • •
Blk Log 1 • • •
Blk Log 2 • •
52 a • •
52 b • •
CB FLT • •
Aux 1 • • •
Aux 2 • • •
Aux 3 • • •
Aux 4 • • •
Aux 5 •
Aux 6 •
Aux 7 •
Aux 8 O
Aux 9 O
Aux A O
Aux B O
Aux C O
Strt Dist • •
Cold L PU • •
Log Sel 1 • •
Log Sel 2 • •
Change Set • •
Block_79 • •
θ Reset • •
Trip Circ • •
Start t BF • •
Maint. M • • •
SOTF • •

Local • • •

Synchro. • • •
Led Reset or
• • •
Reset Led
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 47/68

• = available ← P125 →
O = Option. ← P126 / P127 → ← option P127 →
Inputs

P125

P126

P127
Function
1 2 3 4 5 6 7 8 9 A B C
Ctrl Trip • • •
Ctr Close • • •

2.5.9.2 tAux

Aux 1: Time tAux 1 s

Aux 2: Time tAux 2 s
Aux 3: Time tAux 3 s
Aux 4: Time tAux 4 s
Aux 5: Time tAux 5 (P126 & P127) s
Aux 6: Time tAux 5 (P126 & P127) s
Aux 7: Time tAux 5 (P126 & P127) s
Aux 8: Time tAux 5 (P127 option) s
Aux 9: Time tAux 5 (P127 option) s
Aux A: Time tAux 5 (P127 option) s
Aux B: Time tAux 5 (P127 option) s
Aux C: Time tAux 5 (P127 option) s

2.5.10 BROKEN CONDUCTOR allocation

Relay: P125 (not available)

Brkn Cond ? YES NO

Broken Conductor time tBC s

Ratio I2/I1 %
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 48/68 MiCOM P125/P126 & P127

2.5.11 COLD LOAD PU allocation

Relay: P125 (not available)

Cold Load PU ? YES NO

Input ? YES NO
Auto ? YES NO
tI> ? YES NO
tI>> ? YES NO
tI>>> ? YES NO
tIe> ? YES NO
tIe>> ? YES NO
tIe>>> ? YES NO
tIe>>>> ? YES NO
t2> ? YES NO
t2>> ? YES NO
T Therm ? YES NO
Cold load PU Level %

Cold load PU tCL s

2.5.12 51V allocation

Relay: P125 (not available)

P126 (not available)

(U< OR V2>) & I>>? NO: next menu:

YES
(U<< OR V2>>) & I>>>?
V2>? V not displayed
(U< OR V2>) & I>>? YES NO (last menu)
V2>? V not displayed
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 49/68

2.5.13 VTS allocation

Relay: P125 (not available)

P126 (not available)

VTS? YES NO (last menu)

VTS Alarm? YES NO
VTS Blocks 51V ? YES NO
VTS Blocks Protections? YES NO
VTS Non dir I> YES NO
VTS Non dir I>> YES NO
VTS Non dir I>>> YES NO
VTS Non dir Ie>> YES NO
VTS Non dir Ie>>> YES NO
VTS Non dir Ie>>>> YES NO
tVTS s

2.5.14 CTS allocation

Relay: P125 (not available)

P126 (not available)
P127 (option not available)

CT Supervision? YES NO (last menu)

Ie> In

Ue< V

tCTS s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 50/68 MiCOM P125/P126 & P127

2.5.15 CB FAIL allocation

Relay: P125 (not available)

CB Fail ? YES NO (last menu)

I< BF In not displayed
CB Fail Time tBF In not displayed
Block I> ? Yes No not displayed
Block Ie> ? Yes No not displayed

2.5.16 CIRCUIT BREAKER SUPERVISION allocation

Relay: P125 (not available)

TC Supervision? YES NO
T trip circuit t SUP s
CB Open S'vision YES NO
CB Open Time ms
CB Close S'vision YES NO
CB Close Time ms
CB Open Alarm? YES NO
CB Open NB
Σ Amps(n)? YES NO
Σ Amps(n)

t Open Pulse ms

t Close Pulse ms
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 51/68

2.5.17 SOTF

Relay: P125 (not available)

SOTF? YES NO
t SOTF ms
I>> ? YES NO
I>>> ? YES NO
Ctrl close input YES NO
SOTF input YES NO
HMI closing order YES NO
[79] closing YES NO
Front comm. order YES NO
Rear comm. order YES NO
Rear2 comm. order YES NO

2.5.18 LOGIC EQUATIONS

Equ. A Boolean Logic

A.00 = / = NOT
A.01 OR / = OR NOT / AND / = AND NOT
A.02 OR / = OR NOT / AND / = AND NOT
A.03 OR / = OR NOT / AND / = AND NOT
A.04 OR / = OR NOT / AND / = AND NOT
A.05 OR / = OR NOT / AND / = AND NOT
A.06 OR / = OR NOT / AND / = AND NOT
A.07 OR / = OR NOT / AND / = AND NOT
A.08 OR / = OR NOT / AND / = AND NOT
A.09 OR / = OR NOT / AND / = AND NOT
A.10 OR / = OR NOT / AND / = AND NOT
A.11 OR / = OR NOT / AND / = AND NOT
A.12 OR / = OR NOT / AND / = AND NOT
A.13 OR / = OR NOT / AND / = AND NOT
A.14 OR / = OR NOT / AND / = AND NOT
A.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 52/68 MiCOM P125/P126 & P127

Equ B Boolean Logic

B.00 = / = NOT
B.01 OR / = OR NOT / AND / = AND NOT
B.02 OR / = OR NOT / AND / = AND NOT
B.03 OR / = OR NOT / AND / = AND NOT
B.04 OR / = OR NOT / AND / = AND NOT
B.05 OR / = OR NOT / AND / = AND NOT
B.06 OR / = OR NOT / AND / = AND NOT
B.07 OR / = OR NOT / AND / = AND NOT
B.08 OR / = OR NOT / AND / = AND NOT
B.09 OR / = OR NOT / AND / = AND NOT
B.10 OR / = OR NOT / AND / = AND NOT
B.11 OR / = OR NOT / AND / = AND NOT
B.12 OR / = OR NOT / AND / = AND NOT
B.13 OR / = OR NOT / AND / = AND NOT
B.14 OR / = OR NOT / AND / = AND NOT
B.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms

Equ. C Boolean Logic

C.00 = / = NOT
C.01 OR / = OR NOT / AND / = AND NOT
C.02 OR / = OR NOT / AND / = AND NOT
C.03 OR / = OR NOT / AND / = AND NOT
C.04 OR / = OR NOT / AND / = AND NOT
C.05 OR / = OR NOT / AND / = AND NOT
C.06 OR / = OR NOT / AND / = AND NOT
C.07 OR / = OR NOT / AND / = AND NOT
C.08 OR / = OR NOT / AND / = AND NOT
C.09 OR / = OR NOT / AND / = AND NOT
C.10 OR / = OR NOT / AND / = AND NOT
C.11 OR / = OR NOT / AND / = AND NOT
C.12 OR / = OR NOT / AND / = AND NOT
C.13 OR / = OR NOT / AND / = AND NOT
C.14 OR / = OR NOT / AND / = AND NOT
C.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 53/68

Equ. D Boolean Logic

D.00 = / = NOT
D.01 OR / = OR NOT / AND / = AND NOT
D.02 OR / = OR NOT / AND / = AND NOT
D.03 OR / = OR NOT / AND / = AND NOT
D.04 OR / = OR NOT / AND / = AND NOT
D.05 OR / = OR NOT / AND / = AND NOT
D.06 OR / = OR NOT / AND / = AND NOT
D.07 OR / = OR NOT / AND / = AND NOT
D.08 OR / = OR NOT / AND / = AND NOT
D.09 OR / = OR NOT / AND / = AND NOT
D.10 OR / = OR NOT / AND / = AND NOT
D.11 OR / = OR NOT / AND / = AND NOT
D.12 OR / = OR NOT / AND / = AND NOT
D.13 OR / = OR NOT / AND / = AND NOT
D.14 OR / = OR NOT / AND / = AND NOT
D.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms

Equ. E Boolean Logic

E.00 = / = NOT
E.01 OR / = OR NOT / AND / = AND NOT
E.02 OR / = OR NOT / AND / = AND NOT
E.03 OR / = OR NOT / AND / = AND NOT
E.04 OR / = OR NOT / AND / = AND NOT
E.05 OR / = OR NOT / AND / = AND NOT
E.06 OR / = OR NOT / AND / = AND NOT
E.07 OR / = OR NOT / AND / = AND NOT
E.08 OR / = OR NOT / AND / = AND NOT
E.09 OR / = OR NOT / AND / = AND NOT
E.10 OR / = OR NOT / AND / = AND NOT
E.11 OR / = OR NOT / AND / = AND NOT
E.12 OR / = OR NOT / AND / = AND NOT
E.13 OR / = OR NOT / AND / = AND NOT
E.14 OR / = OR NOT / AND / = AND NOT
E.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 54/68 MiCOM P125/P126 & P127

Equ. F Boolean Logic

F.00 = / = NOT
F.01 OR / = OR NOT / AND / = AND NOT
F.02 OR / = OR NOT / AND / = AND NOT
F.03 OR / = OR NOT / AND / = AND NOT
F.04 OR / = OR NOT / AND / = AND NOT
F.05 OR / = OR NOT / AND / = AND NOT
F.06 OR / = OR NOT / AND / = AND NOT
F.07 OR / = OR NOT / AND / = AND NOT
F.08 OR / = OR NOT / AND / = AND NOT
F.09 OR / = OR NOT / AND / = AND NOT
F.10 OR / = OR NOT / AND / = AND NOT
F.11 OR / = OR NOT / AND / = AND NOT
F.12 OR / = OR NOT / AND / = AND NOT
F.13 OR / = OR NOT / AND / = AND NOT
F.14 OR / = OR NOT / AND / = AND NOT
F.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms

Equ. G Boolean Logic

G.00 = / = NOT
G.01 OR / = OR NOT / AND / = AND NOT
G.02 OR / = OR NOT / AND / = AND NOT
G.03 OR / = OR NOT / AND / = AND NOT
G.04 OR / = OR NOT / AND / = AND NOT
G.05 OR / = OR NOT / AND / = AND NOT
G.06 OR / = OR NOT / AND / = AND NOT
G.07 OR / = OR NOT / AND / = AND NOT
G.08 OR / = OR NOT / AND / = AND NOT
G.09 OR / = OR NOT / AND / = AND NOT
G.10 OR / = OR NOT / AND / = AND NOT
G.11 OR / = OR NOT / AND / = AND NOT
G.12 OR / = OR NOT / AND / = AND NOT
G.13 OR / = OR NOT / AND / = AND NOT
G.14 OR / = OR NOT / AND / = AND NOT
G.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 55/68

Equ. H Boolean Logic

H.00 = / = NOT
H.01 OR / = OR NOT / AND / = AND NOT
H.02 OR / = OR NOT / AND / = AND NOT
H.03 OR / = OR NOT / AND / = AND NOT
H.04 OR / = OR NOT / AND / = AND NOT
H.05 OR / = OR NOT / AND / = AND NOT
H.06 OR / = OR NOT / AND / = AND NOT
H.07 OR / = OR NOT / AND / = AND NOT
H.08 OR / = OR NOT / AND / = AND NOT
H.09 OR / = OR NOT / AND / = AND NOT
H.10 OR / = OR NOT / AND / = AND NOT
H.11 OR / = OR NOT / AND / = AND NOT
H.12 OR / = OR NOT / AND / = AND NOT
H.13 OR / = OR NOT / AND / = AND NOT
H.14 OR / = OR NOT / AND / = AND NOT
H.15 OR / = OR NOT / AND / = AND NOT
T Operate ms
T Reset ms

2.5.19 Comm. Order delay

Relay: P125 (not available)

P126 (not available)

tCommand1 s

tCommand1 s

tCommand1 s

tCommand4 s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 56/68 MiCOM P125/P126 & P127

2.6 RECORDING MENU

2.6.1 CB MONITORING Record
P126 & P127 only.

CB Monitoring Time s
CB Closing Time s
Σ Amps (n) IA
Σ Amps (n) IB
Σ Amps (n) IC

2.6.2 FAULT RECORD Record

Record Number
Fault Time : :
Fault date / /
Active Set Group 1 2
Faulted phase None Phase A Phase B
Phase C Earth
Threshold
Magnitude A
IA Magnitude A
IB Magnitude A
IC Magnitude A
IN Magnitude A
VAB Magnitude (P127) V
VBC Magnitude (P127) V
VCA Magnitude (P127) V
VN Magnitude V
IA^VBC Angle °
IB^VCA Angle °
IC^VAB Angle °
IN^VN Angle °
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 57/68

2.6.3 INSTANTANEOUS Record

Number 1 2 3 4 5
Hour : :
Date / /
Origin
Length s
Trip YES NO

2.6.4 DISTURB RECORD record

Pre-Time s
Post-Time s
Disturb rec Trig On trip On inst.

2.6.5 TIME PEAK VALUE

P126 and P127 only

Time Window mn

2.6.6 ROLLING DEMAND

P126 and P127 only

Sub Period mn
Num of Sub Per.

RECORDS
Fault Record

Record Number N.A. 1 5 1

Disturb Record

Pre-Time N.A. 0.1 3 0.1

Post-Time N.A. 0.1 3 0.1

Disturb rec Trig N.A. ON TRIP or ON INST.

Time Peak Value

Time Window N.A. 5 mn, 10 mn, 15mn, 30mn, 60mn

Rolling Demand N.A. 5 mn, 10 mn, 15mn, 30mn, 60mn

Time Window N.A. 1 mn 60 mn 1 mn

P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 58/68 MiCOM P125/P126 & P127

3. P126 & P127 FURTHER TESTS

3.1 Introduction
The following procedures are written for demonstrating the main protection functions of the
MiCOM P126 (where possible) & P127 relays using an Omicron test or similar. The tests do
not test the limits / boundaries of all available function characteristics. They do tests that the
function is operating at one or two chosen points an a characteristic. This document is not a
complete commissioning procedure but could be referred to when performing commissioning
tests in association with the commissioning section of the service manual.
The procedures will state if a deviation from the standard connections or default settings is
required for testing a particular function. For specific on site applications only enabled
functions would be tested using application specific settings.
3.2 Test equipment
The test procedure has been written on the assumption that an Omicron, or equivalent, test
set will be used. Auxiliary supplies of adequate rating will also be required.
3.3 Type used relay
The following tests have been done using a P127 with the following characteristic.

• Earth Current: 0.01 to 8Ien

• Voltage input: 57-130V

• Auxiliary supply voltage: 130-250Vdc/110-250Vac

• Communication protocol: Mod Bus

• HMI Language: English

• Relay software: Current Version

3.4 Test configuration
Input the factory default settings. These settings shall then be downloaded and recorded in
the test results. Any changes to the settings required by this test procedure shall be recorded
in the test results. Any deviation from the default settings will be indicated for each test.
3.5 Connections to test equipment
The test equipment will be wired as described in the table below unless otherwise stated.
3.6 Test Overcurrent Protection
The following general settings for the relay are suggested

• VT Connection: 3Vpn

• Line CT primary: 1A

• Line CT secondary: 1A

• E/Gnd CT primary: 1A

• E/Gnd CT secondary: 1A

• Line VT primary: 0.10 kV

• Line VT secondary: 100 V

Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 59/68

3.7 Non-directional overcurrent protection

3.7.1 Overcurrent sensitivity tests
Object:
The following tests verify that the relay overcurrent elements operate at the set thresholds.
Test with the following relay settings (all thresholds set as non-directional):

• ON
• 1 In
• Characteristic IDMT
• Curve IEC_SI (Standard Inverse)
• TMS 0.025
• Reset time delay 0.04 s
Inject current of 0.95 In into the A phase input. Increase the current in 0.01In steps, pausing
for 2.5s between each step, until the relay operates. The current must then be reduced in the
same manner until the protection resets.
Repeat the above tests for all phases.
Repeat the above test for other overcurrent stages taking in account that the delay time for
nthe second and third threshold is DMT (t=0s). Make the test before on I>> after on I>>>.
3.7.1.1 Pass Criteria
For the relay to pass it shall operate as detailed below.
Delay trip IDMT (inverse time only for I>):

• Pick-up should occur at 1.1Is ±2%.

• Reset should occur at 1.04Is ±2%.
Delay Trip DT (definite time for I>, I>>, I>>>)

• Pick-up should occur at: Is ±2%.

• Reset should occur at 0.95 Is ±2%.
3.7.2 Overcurrent characteristic tests
Object:
The following tests verify that the relay overcurrent elements trip in the correct time.
Test with the following relay settings:

• Is 1 In
• Characteristic DT / IDMT
• Curve IEC_SI (Standard Inverse)
• TMS 1.0
• Time Delay 1s
• Directionality Non-directional
• Reset time delay 0s
Enable stage 1 overcurrent and prepare the tests set so that A phase current can be
instantaneously applied at 2In and 10In respectively. Measure the operating times of the
relay start and trip contacts. Repeat the test with the element set to IDMT. Repeat the test
with the element disabled and verify that no start or trip elements operate.
Repeat the above testing for all phases and stages (with the exception of IDMT which is only
for the first stage).
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 60/68 MiCOM P125/P126 & P127

3.7.2.1 Pass Criteria

For the relay to pass it shall operate as detailed below
• DT operating time 1.0s ±2%
• IDMT operating time: 10.070s ±2% at 2 In
• 2.991s ±2% at 10 In
3.7.3 Non-directional earth fault overcurrent protection
3.7.3.1 Neutral sensitivity test
Object:
The following tests verify that the relay earth fault elements operate at the set thresholds.
Test with the following relay settings:
• 0.1Ien
• Characteristic IDMT
• Curve IEC_SI (Standard Inverse)
• TMS 0.025
• Delay time 0s
• Directionality Non-directional
• Reset time delay 0.04s
Enable stage 1of Earth Fault protection and inject current of 0.095Ies into the Ie current
input. Increase the current in 0.001In steps, pausing for 2.5s between each step, until the
relay operates.
The current must then be reduced in the same manner until the protection resets.
Repeat the above test for all stages of Earth fault protection (delay type is DT).
3.7.3.2 Pass Criteria
For the relay to pass it shall operate as detailed below.
• Pick-up should occur at 1.1 Ies ±2%
• Reset should occur at 1.05 Ies ±2%
3.7.4 Neutral characteristic tests
Object:
The following tests verify that the relay earth fault elements trip in the correct time.
Test with the following relay settings:
• Characteristic DT / IDMT
• Curve Standard Inverse
• TMS 1.0
• Time Delay 1s
• Directionality Non-directional
• Reset time delay 0s
• Is 1 Ien
Enable stage 1 of Earth Fault protection and prepare the tests set so that Ie current can be
instantaneously applied at 2 Ies and 10 Ies respectively. Measure the operating times of the
relay start and trip contacts. Repeat the test with the element set to IDMT. Repeat the test
with the element disabled and verify that no start or trip elements operate.
Repeat the above testing for all stages (IDMT is only for the first stage).
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 61/68

3.7.4.1 Pass Criteria

For the relay to pass it shall operate as detailed below.

• DT operating time
• 1.0s ±2%
• IDMT operating time
• 10.07s ±2% at 2 Ies
• 2.999s ±2% at 10 Ies
3.7.5 Directional earth fault overcurrent protection
3.7.5.1 Neutral sensitivity test
Object:
The following tests verify that the relay directional earth fault elements operate at the set
thresholds and boundary trip zone.
Wirng scheme: 3Vpn for the voltage, Holmgreen insertion for the currents. The Ie current is
the output common of the phase current inputs.
Test with the following relay settings:

• E/GND Primary 5A

• E/GND Secondary 5A

• Ie> 0.2 Ien

• Characteristic IDMT

• Curve IEC_SI (Standard Inverse)

• TMS 1

• Ue 1V

• Trip Zone -45°/+45°

• Torque Angle 180°

• Directionality Directional

• Reset time delay 0.04s

Set the phase voltage adn phase current as following

• Ua=50V, Ub=57.70V, Uc=57.70V

Set the Ia current to have the ratio Ia/Ie> as:

• Ia/Ie> =2 Trip time in 10.08s

• Inject the current and verify the delay trip time
• Repeat the test for the following ratio
• Ia/Ie> =3 Trip time in 6.36s
• Ia/Ie> =4 Trip in 5.022s
3.7.5.2 Pass Criteria
For the relay to pass it shall operate as detailed below.
Pick-up should occur at 1.1 Ies ±2%

• Time accuracy +/-2% or 20….40ms

P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 62/68 MiCOM P125/P126 & P127

3.7.6 Reset time test

Repeat the test at the paragraph 6.8.1 using definite time setting the tIe> to 10s and Treset
to 10s.
Make the sequence:

− On Input current 2A, after 5s inject 0 A after 5 seconds again 2A.

3.7.6.1 Pass Criteria
For the relay to pass, it shall operate as detailed below.

− The trip occurs after 5s

− Time accuracy: +/-2% or 20….40ms

3.7.7 Directional earth fault operating boundary
Object:
The following tests verify the operating boundary of the characteristic and to verify its pick-up
and drop-off.
Test with the following relay settings:

• VT connection 3Vpn

• Characteristic DT

• t 10s (Operation to be determined by start contacts)

• Is 0.2 Ien

• Torque Angle(RCA) 180°

• Boundary trip zone +/-45°

Enable stage and configure the test set applying Ua=50V, Ub=57.70V, Uc=57.70V.
Apply A phase current of twice setting at 50° leading the A phase voltage.
Increase/decrease the angle between the phase A voltage and current in step of 1° every
2.5s and determine the angle at which the start contacts non-operate and operate, once the
element has started decrease/increase the angle and determine the drop-off.
Repeat the same test for IDMT delay trip time using the previous settings.
3.7.7.1 Pass Criteria
For the relay to pass the following must be satisfied:
The directional decision shall be from the following equations:

Directional forward -45° < RCA (Torque angle) < 45°

The operating boundary shall be within ±3° of the relay characteristic angle ±45°.

The element shall drop off within 3° of pick-up.

Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 63/68

3.7.8 Neutral characteristic tests

Object:
The following tests verify that the relay earth fault elements trip in the correct time.
Test with the following relay settings:

• Characteristic DT / IDMT

• Curve Standard Inverse

• TMS 1.0

• Time Delay 1s

• Directionality Non-directional

• Reset time delay 0s

• Is 1 Ien
Enable stage 1 of Earth Fault protection and prepare the tests set so that Ie current can be
instantaneously applied at 2 Ies and 10 Ies respectively. Measure the operating times of the
relay start and trip contacts. Repeat the test with the element set to IDMT. Repeat the test
with the element disabled and verify that no start or trip elements operate.
Repeat the above testing for all stages (IDMT is only for the first stage).
3.7.8.1 Pass Criteria
For the relay to pass it shall operate as detailed below.
DT operating time

• 1.0s ±2%
IDMT operating time:

• 10.07s ±2% at 2 Ies

• 2.999s ±2% at 10 Ies

3.7.9 Directionaloperating boundary – PHASE overcurrent (only P127)
Object:
The following tests verify the operating boundary of the characteristic and to verify its pick-up
and drop-off.
Test with the following relay settings:

• VT connection 3Vpn

• Characteristic DT

• t 10s (Operation to be determined by start contacts)

• Is 1 In

• Characteristic Angle (RCA) 0°

• Boundary trip zone +/-80°

Enable stage 1of Overcurrent and configure the test set to apply balanced three phase
nominal voltages (57.7V) to the voltage inputs.
Apply A phase current of twice setting at 30° leading the A phase voltage.
Increase/decrease the angle between the A phase voltage and current in step of 1° evry 2.5s
and determine the angle at which the start contacts non-operate and operate, once the
element has started decrease/increase the angle and determine the drop-off.
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 64/68 MiCOM P125/P126 & P127

3.7.9.1 Pass Criteria

For the relay to pass the following must be satisfied:
The directional decision shall be from the following equations:

Directional forward -80° < RCA (Torque angle) < 80°

The operating boundary shall be within ±3° of the relay characteristic angle ±80°.

The element shall drop off within 3° of pick-up.

3.7.10 Earth directional wattmetric test
Wiring scheme is:

• 3Vpn for the voltage

• Holmgreen insertion for the phase and earth current

• CT phase and E/GND ratio primary and secondary to 5A

• VTs primary and secondary set to 0.1kV and 100V

Relay settings:

• Pe> 5 x K W -> 25W

• Delay type IDMT: IEC SI CURVE

• Reset time 0.04s

• Torque angle 180°

• Inject: Ua=57.7V, Ub= 57.7V, Uc=57.7V with these values the Ue is equal to 0.
Inject the Ia phase current with displacement 0° with Ua to have the following ratios Pe/Pe>:
2, 3, 4

• Inject Ua=27.7V, Ub= 57.7V, Uc=57.7V

• Ue=1/3(Ua+Ub+Uc) (vectorial summation)

The relay calculates the Pe as:
Pe= Ue x Ie x Cos(Ie^Ue + Torque angle)
Pe= (27.7-57.7)/3 x Ia x cos(180°) with Ia = 5A you have 50W the ratio is equal 2 follow the
other ones.
Inject 5A for a ratio equal to 2; theoretical delay time 10.03s, measured delay time 10,273s
Inject 7.5A for a ratio equal to 3 theoretical delay time 6.3s, measured delay time 6.43s
Inject 10A for a ratio equal to 4 theoretical delay time 10.03s, measured delay time 5.077s
3.7.10.1 Pass Criteria
For the relay to pass it shall operate as detailed below.
IDMT operating time:

• Accuracy: ±2% or 30…..40ms

Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 65/68

3.7.11 Negative sequence overcurrent

Object:
To verify that the negative sequence overcurrent operation is recorded as a fault record.
Test with the following relay settings:

• DT time Delay 10s

• I2> 0.1In
Apply three phase currents to the relay at a magnitude of In. Step change the A phase
current to a magnitude of 0.5In. Verify that the fault record indicates that the negative
sequence overcurrent has started.
Repeat the above testing with the time delay set to 0s. The fault record should now indicate
trips.
3.7.11.1 Pass Criteria
For the relay to pass it shall operate as detailed above.
3.7.12 Thermal overload
Object:
The following tests verify that thermal overload starts and trips applied to the relay operate
correctly.
Test with the following relay settings:

• Thermal trip current Iθ> 0.5 In

• Thermal alarm θ> No

• Time Constant Te 1 min

• K 1

• θ Trip 100%
Configure the test set to apply 3 phase balanced current to the relay.
Reset the thermal time state of the relay. Inject three phase 0.55 In to the relay and measure
the operating time of the contact. Verify that the fault record indicates that the thermal
overload alarm has operated followed by a thermal overload trip after 107 s ±2%.
3.7.12.1 Pass Criteria
For the relay to pass it shall operate as detailed above.
3.8 Voltage Protection (only P127)
The voltage protection 27 and 59 compare the line voltage to the setting elements of each
protection.
3.8.1 Under voltage
Object:
The following tests verify that under voltage starts and trips applied to the relay operate
correctly.
Test with the following relay settings:

• Mode OR

• Characteristic DT

• DT 30s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 66/68 MiCOM P125/P126 & P127

3.8.2 Phase to neutral under voltage element

Test with the following relay settings:

• U< 50V
Enable stage 1 over voltage and apply rated three phase voltages (57.7V per phase) to the
relay. After 2s reduce the phase A voltage and phase B voltage to 20V. Measure the
operating times of the relay start and trip contacts. Repeat the test with the element disabled
and verify that no start or trip elements operate.
Repeat the above tests for stage 2 under voltage.
3.8.3 Over voltage
Object:
To verify that over voltage starts and trips applied to the relay operate correctly.
Test with the following relay settings:

• Mode OR

• Characteristic DT

• DT 10s
3.8.4 Phase to neutral over voltage element
Test with the following relay settings:

• U>100V
Enable stage 1 and apply three phase voltages (50V per phase) to the relay. After 1s
increase the phase A voltage and phase B voltage to 60V. Measure the operating times of
the relay start and trip contacts. Repeat the test with the element disabled and verify that no
start or trip elements operate.
Repeat the above testing for stage 2 overvoltage.
3.8.5 Residual over voltage
Object:
The following tests verify that residual over voltage starts and trips applied to the relay are
recorded as fault records.
Test with the following relay settings:

• Ue Derived (VT Connection setting 3Vpn)

• Ue>>>> 10V

• Trip Delay 10s

Enable stage of the residual overvoltage protection and apply balanced three phase voltages
to the relay (57.7V per phase) after 2s reduce UA phase voltage to 25V . Measure the
operating times of the relay start and trip contacts. Repeat the test with the element disabled
and verify that no start or trip elements operate.
3.8.5.1 Pass Criteria
For the relay to pass it shall operate as detailed below.
Commissioning Test and Record Sheet P12y/EN RS/E95

MiCOM P125/P126 & P127 Page 67/68

3.9 Automatic control functions

3.9.1 Trip circuit supervision
Connect the coil of the external auxiliary relay as the example in the Technical Guide
P12y/EN AP page 55.

+ Vdc

52a

2 6 Trip
order Opto-
input

MiCOM P126/P127

- Vdc
P0096ENa

Set the following parameters.

Set in the CB Monitoring TCS ON and
Input menu:
Assign Trip. Circ. to input 1
Assign an output relay to the 52 Fail
Procedure
Supply the input and verify that the led and the relay are OFF
Remove the supply from the input and verify that the output relay are ON after the set of the
TCS timer.
3.9.2 Circuit breaker failure
Object:
The following test verifies the Breaker Failure operation.
Test with the following relay settings:
Overcurrent:

• Characteristic DT
• Time Delay 0s
• Directionality Non-directional
• Reset time delay 0s
• Is (I>) 1 In
CBF:

• Time Delay 0s
• I<BF 0.5 In
• tBF 5s
P12y/EN RS/E95 Commissioning Test and Record Sheet

Page 68/68 MiCOM P125/P126 & P127

The relay shall be configured with trip commands relay assigned to t_I>, with relay 2
assigned to CB fail function and with relay 2 assigned as latched.
Enable stage 1 overcurrent and apply three phase currents to the relay at 0.8 In for 1s;
instantaneously increase the currents applied to the ABC phase inputs to 2 In for 7s. Verify
after the increase that tat the relays number 2 change in the status display windows to level
1 after 5s.
3.9.2.1 Pass Criteria
For the relay to pass it shall operate as detailed above.
3.9.3 Cold load pick-up
Test with the following relay settings:
Cold load pick-up:

• t_I> Yes

• Level 200%

• tCL 5.0 s
Overcurrent:

• Characteristic DT

• Time Delay 2s

• Directionality Non-directional

• Reset time delay 0s

• Is (I>) 1In
Inputs:

• Input 1 Cold L PU
Apply three phase currents to the relay at a magnitude of 1.5 In and supply the input 1.
Verify after 8 sec the trip of the overcurrent is recrided as a fault record.
3.9.3.1 Pass Criteria
For the relay to pass it shall operate as detailed above.
3.9.4 Broken Conductor
Object:
The following tests verify that a broken conductor condition causes the relay to operate
correctly.
Test with the following relay settings:

• I2/I1 setting 20%

• Characteristic DT

• Time Delay 10s

Apply rated three phase currents (1In). After 10 seconds have elapsed, reduce the current in
A phase to zero and measure the time taken for the relay to indicate a broken conductor trip.
Repeat the test with the element disabled and verify that no start or trip elements operate.
3.9.4.1 Pass Criteria
For the relay to pass it shall operate as detailed below.

• DT operating time 10.0s ±2%

Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127

HARDWARE/SOFTWARE
VERSION HISTORY AND
COMPATIBILITY
P125 P126 V12
P127 V13
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 1/28

CONTENTS

1. INTRODUCTION 3

2. MiCOM P125 4

3. MiCOM P126 9

4. MiCOM P127 17
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 2/28 MiCOM P125/P126/P127

BLANK PAGE
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 3/28

1. INTRODUCTION

HARDWARE INSTALLED

HARD 4: First version of hardware (Px2x Phase 1)

HARD 5: Latest version of hardware (Px2x Phase 2)

SERIAL NUMBER HELP

The serial number (e.g. 0804253) informs about the date of manufacture and the version
of hardware. It printed on the front relay label. This number is read from left to right:
- 2 first number define the week (e.g. 08 is the calendar week 8).
- 2 number following define the year (e.g. 04 is the year 2004).
- 3 final is a consecutive number up to 999 to uniquely identify the relay.

E.g.: W W Y Y N N N
- W = Week 01 To 52
- Y = Year (19)94 To (20)93
- N = Product Arrang. 001 To 999
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 4/28 MiCOM P125/P126/P127

2. MiCOM P125
P125 – Serial number – Hardware Correlation
Serial Number Hardware installed
Phase 1 HARDWARE VERSION 4
Phase 2 HARDWARE VERSION 5

Relay Type P125

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V3 2001 Software changes implemented in this version V2.03 Hard 4
- Addition of Polish, Czech and Spanish,
- Software corrections.
V4 2001 Software changes implemented in this version V2.03 Hard 4
- Addition of:
. cyrillic characters, Italian, German and Dutch,
. factory and battery alarms,
. energy reset by remote TC (Modbus),
. “parameter changed” event,
. LED & output relays conf. on single pole current
tripping,
. digital inputs supply & operating modes,
. 2nd settings group active on output relay conf.
. start protections alarms,
. IDMT curve on 1st threshold (32n, 46, 67 and 67n),
. rescue password,
. VDEW protocol,
- Date & time IEC format implemented,
- Password request for energy reset,
- Software corrections.
V5 2003 Software changes implemented in this version V2.10 Hard 4
- EEPROM self test and management modified,
- Real time clock evolution,
- Modification during transmissions,
- Modification of hardware text alarms,
- Addition of Russian and Portuguese languages.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 5/28

Relay Type P125

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.A 09/2003 Software changes implemented in this version V2.10 Hard 2
- Enhancement of EEPROM software, or
Hard 4
- Protection 67 and 67N, addition of IDMT time on 2nd
threshold,
- For every protection with IDMT thresholds moved max
RTMS to 3.2 from 1.5,
- For Automatism addition of:
. maintenance mode,
. tAUX3 and tAUX4,
. LED autotest on new fault,
- Threshold setting of 32N protection: K constant substitued
by E/Gnd CT sec value,
- Modbus - addition of 32N: Po, IoCos, Io^Uo angle,
- 67N: trip zone correction (secondary ground TC = 5A),
- Modification to fix FPGA upload,
- Correction of communication bug.

V6.C 09/2005 Software changes implemented in this version V2.11 Hard 4

- Protocol IEC60870-5-103:
. management of private/public address added,
. class 1 information corrected,
. no ASDU23 sent after disturbance creation if already
connected corrected,
. reset LED not updated information corrected,
. time synchro. correction,
- Cyrillic character display corrected.

V6.F 09/2005 Software changes implemented in this version V2.12 Hard 4

- In the Configuration / Group Select sub-menu:
. “Change Group By Input” becomes “Change Group By”,
. “LEVEL / EDGE” becomes “INPUT / MENU”,
. the setting “Start/Stop tAux_ by input” is removed,
- Creation of Hungarian language.

V6.F1 01/2007 Software changes implemented in this version V2.12 Hard 4

- IEC60870-5-103 communication, correction of:
. relay blocking after reception of a time synchronisation
frame (IEC60870-5-103),
. processing of Start In> event,
. period of sampling in disturbance extracted,
. scale factor for Ia,
. disturbance record upload of channels for U0 and
frequency,
. ASDU 9 unused fields.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 6/28 MiCOM P125/P126/P127

Relay Type P125

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.G 02/2007 Software changes implemented in this version V2.12 Hard 4
- Software corrections:
. Angle Ie/Ue,
. [67n]U>> and [67N]U>>> initialization (comm. Modbus),
. data copy address during initialization,
. elimination of offset of analog input in the displayed
measurement of IE & UE,
. Initialization of minimum threshold of I0 & U0,
. trip and auxiliary relays latches,
. implementation of commands of group 1 and group 2
(IEC60870-5-103),
. IN event start (IEC60870-5-103),
. Correction alarm string display,
. minimum of amplitude to calculate frequency,
. IeCos calculation with verification of Ue voltage,
. “Control trip” and “Control close” french label,
. Initialisation of the process after CT and VT ratio setting
with modbus comm.,
. DMT temporization parameter “TiE>>” visibility,
. Io_cos & Po_cos when IR injected is near saturation,
. “Ue>>>” fault records french label,
. Ia, Ib and Ic channels scale factor in disturbance record
extraction.

V6.H 01/2008 Software changes implemented in this version V2.13 Hard 4

- Correction of Phase I DTS,
- “RTMS Ie>>” and “tReset Ie>>>” reinitialisation if sent by
communication modbus,
- Correction of the reinitialization of settings (“RTMS
Ie>>” and “tReset Ie>>>”) sent by communication
modbus.

V10.D 08/2006 V10.D software is equivalent to V6.H software based on V2.13 Hard 5
the phase II hardware redesign (Hard 4)
Software changes implemented in this version
- None.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 7/28

Relay Type P125

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.A 06/2007 Software changes implemented in this version V2.14 Hard 5
- Phase rotation: right computation with ACB phase
rotation,
- Phase angle display: the order of phases (I & U) can be
displayed in the measurement menu,
- Improvement of offset: offset calibration values can be
memorized for each range and each gain,
- Auxiliary logic inputs: temporized and assignable to LED,
trip order, output relays and equations, and recordable in
event file,
- Fail safe relay: possibility to deactivate a relay if
associated information is activated,
- The clock can be synchronized by logic input,
- TMS and RTMS step reduced to 0.001,
- Multi assignable logic inputs:
. assignable to several internal signal,
. full ascendant compatibilty with former system,
- Phase of each signal can be calibrated,
- Addition of disturbance, event, instantaneous and default
information saving, saved statistics records functionality,
- Logic inputs can be assignated to the outputs,
- 25 faults and 250 events recordable,
- 51V protection: I>>(>) minimum threshold value can be
adjusted to 0.1 In,
- DNP3.0 protocol added,
- Correction of software defects:
. values error after disturbance avalanche. presence of
non-acknoledged records bit in Modbus communication
improved,
. communication Modbus addresses improved for reading

Software changes implemented in this version

- Addition of Turkish language,
- Event of latched relays: correction of the modbus
address,
- “Disturbance trigger” event added in event records,
- Communication Modbus:
V11.B 12/2007 . modification of the manual acknowledgement of V2.14 Hard 5
oldest event and fault record,
. modification of the disturbance record
acknowledgement status,
. modification of the remote control for disturbances
acknowledgement,
. disturbance record: correction of number of pages
and number of samples in the service frame.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 8/28 MiCOM P125/P126/P127

Relay Type P125

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.C 06/2009 Software changes implemented in this version V3.1 Hard 5
- logic equations: opto-inputs state added,
- new inhibited alarms (auxiliary timers and logic
equations),
- German labels updated,
- Correction of:
. settings after password setting (front keyboard)
. communication port failure alarm,
. tAux alarm generation
. HMI trouble after local paswword entering during data
edition with offset,
. disturbance recording duration,
. events display during CPU load phases.

V12.A 09/2009 Software changes implemented in this version V3.1 Hard 5

- Possibility to operate the CB and to start a disturbance
recording from the relay HMI,
- Total trips number calculated with all the CB operations,
- Disturbance recorder time modified,
- IA, IB, IC & I0 displayed on the same time on relay,
- The result of a Boolean equation can be used in an other
equation,
- Correction of:
. the decimal value of DMT temporisation when ≥ 20s,
. absolute time on disturbance record,
. Chinese text on “Output Relay” menu,
. 32bits value in E2PROM with MODBUS Protocol,
. problem of extraction of events with MiCOM S1 using
MODBUS protocol.
V12.B 01/2010 Software changes implemented in this version V3.1 Hard 5
- Correction of:. default language selection,
. IEC60870-5-103 comm.: event transmission with
ModBus,
. HMI translations,
. disturbance records: storage of start of
disturbance,
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 9/28

3. MiCOM P126
P126 - Serial number – Hardware Correlation
Serial Number Hardware installed
Phase 1 HARDWARE VERSION 4
Phase 2 HARDWARE VERSION 5

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V3.A 2001 Software changes implemented in this version V2.03 Hard 4
to
- Addition of Polish Czech and Spanish,
V3.J
- Software corrections.
V4.A 2001 Software changes implemented in this version V2.03 Hard 4
to -
- Addition of:
V4.J 2003
. cyrillic characters, Italian, German and Dutch,
. factory and battery alarms,
. energy reset by remote TC (Modbus),
. “ parameter changed” event,
. LED & output relays conf. on single pole current
tripping,
. digital inputs supply & operating modes,
. 2nd settings group active on output relay conf.
. start protections alarms,
. IDMT curve on 1st threshold (32n, 46, 67 and
67n),
. rescue password,
. VDEW protocol,
- Date & time IEC format implemented,
- Password request for energy reset,
- Software corrections.
V5.A 2003 Software changes implemented in this version V2.10 Hard 4
V5.B
- EEPROM self test and management modified,
V5.C
- Real time clock evolution,
- Modification during transmissions,
- Modification of hardware text alarms,
- Addition of Russian and Portuguese languages.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 10/28 MiCOM P125/P126/P127

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.A 09/2003 Software changes implemented in this version V2.10 Hard 2
- Enhancement of EEPROM software, or
Hard 4
- Addition of matrix management for recloser,
- Protection 67 and 67N, addition of:
. IDMT time on 2nd threshold,
. peak detection on 3rd threshold
- For every protection with IDMT thresholds moved max
RTMS to 3.2 from 1.5,
- For Automatism addition of:
. SOTF/TOR function,
. maintenance mode,
. tAUX3 and tAUX4,
. LED autotest on new fault,
. rolling demand on new fault,
. local/remote function,
- Addition of instantaneous records,
- tIA, tIB and tIC modification,
- Threshold setting of 32N protection: K constant
substitued by E/Gnd CT sec value,
- Modbus: addition of 32N: Po, IoCos, Io^Uo angle,
- Correction of alarms saving in backup RAM,
- Start tBF correction (breaker failure),
- Correction of delay between analog and logic channel
(disturbance record),
- Correction of P & Q calculation (3Vpn & 2Vpn+Vr
wiring),
- 67N: trip zone correction (secondary ground TC = 5A),
- Modification to fix FPGA upload,
- Correction of communication bug.

V6.B 10/2004 Software changes implemented in this version V2.11 Hard 4

- Correction of the IEC60870-5-103 disturbance extracted
from the front Modbus port, correcting the logical
information "GENERAL START", "CB FAIL" and
"tIe>>/tIe>>>",
- Addition of event record of alarm acknowledgement by
push-button,
- Enhancement when phase A, B or C is near the
hysteresis threshold,
- Communication IEC60870-5-103: addition of
management of private/public address.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 11/28

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.C 12/2004 Software changes implemented in this version V2.11 Hard 4
- Event record of alarm acknowledgement by push-button
added,
- Protocol IEC60870-5-103:
. management of private/public address added,
. Class 1 information corrected,
. no ASDU23 sent after disturbance creation if already
connected corrected,
. Reset LED not updated information corrected,
. time synchro. correction,
- Broken conductor: logic equation A, B, C and D
corrected,
- Cyrillic character display corrected,
- Frequency tracking correction.

V6.D 09/2005 Software changes implemented in this version V2.12 Hard 4

- Correction of relay blocking after some tripping,
- Backup SRAM alarm correction.

V6.F 09/2005 Software changes implemented in this version V2.12

- In the Configuration / Group Select sub-menu:
. “Change Group By Input” becomes “Change Group
By”,
. “LEVEL / EDGE” becomes “INPUT / MENU”,
. the setting “Start/Stop tAux_ by input” is removed,
- Creation of Hungarian language,

V6.F1 01/2007 Software changes implemented in this version V2.12

- IEC60870-5-103 communication, correction of:
. relay blocking after reception of a time synchronisation
frame (IEC60870-5-103),
. processing of Start In> event,
. period of sampling in disturbance extracted,
. scale factor for Ia,
. disturbance record upload of channels for U0 and
frequency,
. ASDU 9 unused fields.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 12/28 MiCOM P125/P126/P127

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.G Software changes implemented in this version V2.12
- Software defects corrections:
. Angle Ie/Ue,
. “SF6” alarm text,
. [67n]U>> and [67N]U>>> initialisation (comm.
Modbus),
. time synchronization frame reception (IEC60870-5-
103),
. data copy address during initialization,
. verification of local mode to inhibit command
(IEC60870-5-103),
. trip and auxiliary relays latches,
. IN event start (IEC60870-5-103),
. Correction alarm string display,
. minimum of amplitude to calculate frequency,
. IeCos calculation with verification of Ue voltage,
. “Control trip” and “Control close” french label,
. Initialisation of the process after CT and VT ratio
setting with modbus comm.,
. frequency of disturbance records is nominal network
frequency according to comtrade format,
. Equation logic for I2>>> and tI2>>>,
. DMT temporization parameter “TiE>>” visibility,
. blocking Logic of thermal state,
. protection thermal “Ith>” and “Te” initialization after
setting,
. amplitude of IeCos fault,
. Io_cos & Po_cos when IR injected is near saturation,
. “Ue>>>” fault records french label,
. Period of samples of disturbance extracted
(IEC60870-5-103),
. ASDU 9 unused fields,
. “recloser blocked” or “VTS” alarm after switching
ON/OFF,
. Ia, Ib and Ic channels scale factor in disturbance
record extraction,
. disturbance record upload of channels for U0 and
frequeency,
. RAM content verification at starting.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 13/28

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.H Software changes implemented in this version V2.13 Hard 4
- Possibility to start autoreclose from an external device
using tAux1 and tAux2 without tripping the CB,
- Correction of Phase I DTS,
- Recloser: information of definitive trip occurs if the
matrix of cycle does not set “nb cycle”+1,
- Correction of SF6 front face alarm text (same as logical
input text corresponding to “CB Ftt”,
- “RTMS Ie>>” and “tReset Ie>>>” reinitialisation if sent
by communication modbus,
- Communication IEC-60870-5-103: inhibition of
command if the local mode has been selected by logic
input,
- The fault record number to display can be modified
using Modbus communication w/o affecting the
displayed fault,
- Modification of the primary ratio for voltages
channels with voltage option 220-480V in
disturbance records uploaded with IEC-60870-5-
103,
- Correction of the reinitialization of settings (“RTMS
Ie>>” and “tReset Ie>>>”) sent by communication
modbus.

V10.D 08/2006 V10.D software is equivalent to v6.H software based V2.13 Hard 5
on the phase II hardware redesign (Hard 4).
Software changes implemented in this version
- None.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 14/28 MiCOM P125/P126/P127

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.A 06/2007 Software changes implemented in this version V2.14 Hard 5
- Phase rotation: right computation with ACB phase
rotation,
- Phase angle display: the order of phases (I & U) can be
displayed in the measurement menu,
- Improvement of offset: offset calibration values can be
memorized for each range and each gain,
- Auxiliary logic inputs: temporized and assignable to
LED, trip order, output relays and equations, and
recordable in event file,
- Fail safe relay: possibility to deactivate a relay if
associated information is activated,
- The clock can be synchronized by logic input,
- TMS and RTMS step reduced to 0.001,
- Multi assignable logic inputs:
. assignable to several internal signal,
. full ascendant compatibilty with former system,
- I< configurable on opened circuit breaker (o/o),
- Addition of boolean equations with operators NOT, AND
and OR,
- Phase of each signal can be calibrated,
- Logic inputs can be assignated to the outputs,
- 25 faults and 250 events recordable,
- 51V protection: I>>(>) minimum threshold value can be
adjusted to 0.1In
- DNP3.0 protocol added,
- Correction of software defects:
. values error after disturbance avalanche,
. date of event logic input improvement,
. presence of non-acknoledged records bit in Modbus
communication improved,
. the fault record number to display can be modified
using Modbus communication,
. communication Modbus addresses improved for
reading,
. correction of auto-acknowledgement of disturbance.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 15/28

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.B 12/2007 Software changes implemented in this version V2.14 Hard 5
- Addition of equation logic logic assigned to LED,
- Modification of all equation logic labels (from Equ.x”
to “tEqu.x”),
- Addition of Turkish language,
- Event of latched relays: correction of the modbus
address,
- “Disturbance trigger” event added in event records,
- Communication Modbus:
. modification of the manual acknowledgement of
oldest event and fault record,
. modification of the disturbance record
acknowledgement status,
. modification of the remote control for disturbances
acknowledgement,
. disturbance record: correction of number of pages
and number of samples in the service frame,

V11.C 06/2009 Software changes implemented in this version V3.1 Hard 5

- Addition of auxiliary timers in coherence with the
number of opto inputs. tAux5, tAux6 and tAux7 timers
duration can be set up to 20000s (> 5.5 hours),
- Logic equations: opto-inputs state added,
- New inhibited alarms (auxiliary timers and logic
equations),
- German labels updated,
- Correction of:
. settings after password setting (front keyboard)
. ΣAmps(n) counter,
. communication port failure alarm,
. tAux alarm generation
. blocking by “CB fail” of “I> rev” and “Ie> rev”,
. display of protection (minimum amplitude) after boot or
remote setting.
. HMI trouble after local paswword entering during data
edition with offset,
. AR Cycle tAux settable to start and inhib,
. disturbance recording duration,
. events display during CPU load phases.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 16/28 MiCOM P125/P126/P127

Relay Type P126

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V12.A 09/2009 Software changes implemented in this version V3.1 Hard 5
- New inhibited alarms added (possibility to inhibit alarm
on tAux, I<, U<, P<, Q<, F< and Boolean logic)
- Possibility to operate the CB and to start a disturbance
recording from the relay HMI,
- Possibility to start:
. SOTF using any control close information,
. Cold Load Pickup by 52A or “not I< & I>” or “I0< & I0>”,
- Total trips number calculated with all the CB operations,
- Possibility to program autoreclose blocking after a
number of reclose or a defined time,
- Possibility to assign any signal to any LED,
- Disturbance recorder time modified,
- IA, IB, IC & I0 displayed on the same time on relay,
- Front face Led resettable via a logic input selection,
- “79 internal locked” and “79 external locked” assigned to
output signals,
- Selectivity between two relays with tReset +
autorecloser.
- The result of a Boolean equation can be used in an
other equation,
- CB Fail added in Boolean equation,
- Correction of:
. the decimal value of DMT temporisation when ≥ 20s,
. absolute time on disturbance record,
. Chinese text on “Output Relay” menu,
. 32bits value in E2PROM with MODBUS Protocol,
. problem of extraction of events with MiCOM S1
using MODBUS protocol.
V12.B 01/2010 Software changes implemented in this version V3.1 Hard 5
- Correction of:
. DNP V3.0 comm.: “multi-fragment responses”
processing,
. default language selection,
. IEC60870-5-103 comm.: event transmission with
ModBus,
. HMI translations,
. disturbance records: storage of start of disturbance,
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 17/28

4. MiCOM P127
P127 - Serial number – Hardware Correlation
Serial Number Hardware installed
Phase 1 HARDWARE VERSION 4
Phase 2 HARDWARE VERSION 5

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V3.A 2001 Software changes implemented in this version V2.03 Hard 4
to
- Addition of Polish Czech and Spanish,
V3.J
- Software corrections.
V4.A 2001 Software changes implemented in this version V2.03 Hard 4
to -
- Addition of:
V4.J 2003
. cyrillic characters, Italian, German and Dutch,
. factory and battery alarms,
. energy reset by remote TC (Modbus),
. “ parameter changed” event,
. LED & output relays conf. on single pole current
tripping,
. digital inputs supply & operating modes,
. 2nd settings group active on output relay conf.,
. start protections alarms,
. IDMT curve on 1st threshold (32n, 46, 67 and
67n),
. rescue password,
. VDEW protocol,
- Date & time IEC format implemented,
- Password request for energy reset,
- Software corrections.
V5.A 2003 Software changes implemented in this version V2.10 Hard 4
V5.B
- EEPROM self test and management modified,
V5.C
- Real time clock evolution,
- Modification during transmissions,
- Modification of hardware text alarms,
- Addition of Russian and Portuguese languages.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 18/28 MiCOM P125/P126/P127

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.A 09/2003 Software changes implemented in this version V2.10 Hard 2
- Enhancement of EEPROM software, or
Hard 4
- Addition of matrix management for recloser,
- Protection 67 and 67N, addition of IDMT time on 2nd
threshold,
- For every protection with IDMT thresholds moved max
RTMS to 3.2 from 1.5,
- For Automatism addition of:
. SOTF/TOR function,
. maintenance mode,
. tAUX3 and tAUX4,
. LED autotest on new fault,
. rolling demand on new fault,
. local/remote function,
- Addition of instantaneous records,
- tIA, tIB and tIC modification,
- threshold setting of 32N protection: K constant
substitued by E/Gnd CT sec value,
- Modbus: addition of 32N: Po, IoCos, Io^Uo angle,
- Correction of alarms saving in backup RAM,
- Modification of cos(ϕ) calculation,
- Start tBF correction (breaker failure),
- Correction of delay between analog and logic channel
(disturbance record),
- 67N: trip zone correction (secondary ground TC = 5A),
- Modification to fix FPGA upload,
- Correction of communication bug.

V6.A 09/2003 Software changes implemented in this version V2.10 Hard 2

- Addition of periodic self test of EEPROM data, or
Hard 4
- Optimization of the readings in E2PROM (writing of
the value of the checksums in internal RAM),
- Replacement of the data storage circuit breaker in
E2PROM by a storage in safeguarded RAM,
- IEC870-5-103 communication: addition of ASDU 3.4
for measurement IN,
- In the management of the validity of the date and
season in the messages, modifications in
acknowledgement of the orders and time
synchronization.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 19/28

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.B 10/2004 Software changes implemented in this version V2.11 Hard 4
- Addition of the automatism 51V (Voltage controlled
over-current protection) for I>> and I>>> thresholds.
The 51V blocks the I>> if there isn't the U< or V2>
detected. It blocks the I>>> if there isn't the U<< or
V2>> detected,
- Addition of the automatism VTS (Voltage Transformer
Supervision). Addition of alarm and event associated.
The VTS is active if (V2 > 0.3Vn & I2 < 0.5In) or (V1 <
0.1Vn & I1 > 0.1In). Possibility to blocks the 51V if
VTS is active,
- Addition of the calculation of V1 and V2 (module of
Fourier) for use with 51V and VTS,
- Addition of the two settings of thresholds V2> and
V2>> for use with 51V,
- Correction of I> and I>> start when I> or I>> are in
“yes” or “dir” mode, and I>>> in “peak” mode,
- Correction of the IEC60870-5-103 disturbance
extracted from the front Modbus port, correcting the
logical information "GENERAL START", "CB FAIL"
and "tIe>>/tIe>>>".

V6.C 12/2004 Software changes implemented in this version V2.11 Hard 4

- Event record of alarm acknowledgement by push-
button added,
- Protocol IEC60870-5-103:
. management of private/public address added,
. Class 1 information corrected,
. no ASDU23 sent after disturbance creation if already
connected corrected,
. Reset LED not updated information corrected,
. time synchro. correction,
- Broken conductor: logic equation A, B, C and D
corrected,
- Cyrillic character display corrected,
- Frequency tracking correction.

V6.D 09/2005 Software changes implemented in this version V2.12 Hard 4

- Correction of relay blocking after some tripping,
- Backup SRAM alarm correction
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 20/28 MiCOM P125/P126/P127

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.E 09/2005 Software changes implemented in this version V2.12 Hard 4
- Recloser 79:
. modification of “auto-recloser in progress”
management and associated event generation:
. mofification of “final trip” information management,
. locked auto-recloser assignable to the output,
. manual close modified
. "Ctrl Trip", "tAux3", "tAux4" and "Trip SOTF" added,
- Communication IEC870-5-103: correction of scale
factor RFA calculated for Current and Voltage values.

V6.F 09/2005 Software changes implemented in this version V2.12

- In the Configuration / Group Select sub-menu:
. “Change Group By Input” becomes “Change Group
By”.
. “LEVEL / EDGE” becomes “INPUT / MENU”.
. the setting “Start/Stop tAux_ by input” is removed.
- Creation of Hungarian language.

V6.F1 01/2007 Software changes implemented in this version V2.12

- IEC60870-5-103 communication, correction of:
. relay blocking after reception of a time
synchronisation frame (IEC60870-5-103),
. processing of Start In> event
. period of sampling in disturbance extracted,
. scale factor for Ia,
. disturbance record upload of channels for U0 and
frequency,
. ASDU 9 unused fields
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 21/28

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.G 02/2007 Software changes implemented in this version V2.12 Hard 4
- Software defects corrections:
. Uc RMS and Uca RMS values (2Vpn+Vr and
2Vpp+Vr connections
. Angle Ie/Ue,
. “SF6” alarm text,
. [67n]U>> and [67N]U>>> initialisation (comm.
Modbus)
. time synchronization frame reception (IEC60870-5-
103)
. data copy address during initialization
. verification of local mode to inhibit command
(IEC60870-5-103)
. trip and auxiliary relays latches,
. IN event start (IEC60870-5-103),
. Correction alarm string display,
. minimum of amplitude to calculate frequency,
. IeCos calculation with verification of Ue voltage,
. measurement of hig power and energy display value,
. “Control trip” and “Control close” french label,
. Initialisation of the process after CT and VT ratio
setting with modbus comm.,
. frequency of disturbance records is nominal network
frequency according to comtrade format,
. Equation logic for I2>>> and tI2>>>
. blocking Logic of thermal state,
. “VT connection” parameter on “2Vpn+Vr” value,
. protection thermal “Ith>” and “Te” initialization after
setting,
. amplitude of IeCos fault,
. Io_cos & Po_cos when IR injected is near saturation,
. “Ue>>>” fault records french label,
. Period of samples of disturbance extracted
(IEC60870-5-103),
. “recloser blocked” or “VTS” alarm after switching
ON/OFF
. Ia, Ib and Ic channels scale factor in disturbance
record extraction,
. alarm VTS with the closing or opening of the CB,
. VTS occuring after 3 phase default (3Vpn
connection),
. RAM content verification at starting.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 22/28 MiCOM P125/P126/P127

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V6.H 01/2008 Software changes implemented in this version V2.13 Hard 4
- if U< and U<< protection is used with 51V, ther is no
alarm and no blocking of change group from this
protection,
- Possibility to start autoreclose from an external device
using tAux1 and tAux2 without tripping the CB,
- Correction of Phase I DTS,
- Recloser: information of definitive trip occurs if the
matrix of cycle does not set “nb cycle”+1,
- Correction of SF6 front face alarm text (same as
logical input text corresponding to “CB Ftt”,
- “RTMS Ie>>” and “tReset Ie>>>” reinitialisation if sent
by communication modbus,
- Communication IEC-60870-5-103: inhibition of
command if the local mode has been selected by logic
input,
- The fault record number to display can be modified
using Modbus communication w/o affecting the
displayed fault,
- Modification of the primary ratio for voltages
channels with voltage option 220-480V in
disturbance records uploaded with IEC-60870-5-
103,
- Correction of change settings group,
- Correction of the reinitialization of settings (“RTMS
Ie>>” and “tReset Ie>>>”) sent by communication
modbus.

V10.D 08/2006 V10.D software is equivalent to v6.H software based V2.13 Hard 5
on the phase II hardware redesign (Hard 4).
Software changes implemented in this version
- None.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 23/28

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.A 06/2007 Software changes implemented in this version V2.14 Hard 5
nd
- 2 harmonic blocking: For each three currents phases
the harmonic restraint compare the ratio of harmonic 2
to fundamental with the ratio setting. Inrush detection
could block I>, I>>, I>>>, Ie>, Ie>>, Ie>>>, I2>, I2>>
and I2>>>,
- Improve measurements with VA & VAH: The apparent
power and apparent energy are available (as
measurement) in the LCD panel,
- Phase rotation: right computation with ACB phase
rotation,
- Phase angle display: the order of phases (I & U) can
be displayed in the measurement menu,
- Improvement of offset: offset calibration values can be
memorized for each range and each gain,
- Auxiliary logic inputs: temporized and assignable to
LED, trip order, output relays and equations, and
recordable in event file,
- Fail safe relay: possibility to deactivate a relay if
associated information is activated,
- The clock can be synchronized by logic input,
- TMS and RTMS step reduced to 0.001,
- VTS:
. assignable to output relay.
. Overcurrent directional protection can be
transformed to the non-directional protection when
VTS is cactive.
. Some protection blocking are extended when VTS is
active.
- Multi assignable logic inputs:
. assignable to several internal signal,
. full ascendant compatibilty with former system
- I< configurable on opened circuit breaker (o/o) and/or
U<,
- Addition of boolean equations with operators NOT,
AND and OR,
- phase of each signal can be calibrated,
- addition of 6 instantaneous and temporized frequency
min/max protections (81< and 81>),
- overpower relay (alternator protection agains power
inversion) functionality added,
- logic inputs can be assignated to the output s,
- 25 faults and 250 events recordable,
- 51V protection:
. I>>(>) minimum threshold value can be adjusted to
0.1 in
. if U< and U<< protection is used with 51V, ther is no
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 24/28 MiCOM P125/P126/P127

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
alarm and no blocking of change group from this
protection,
- DNP3.0 protocol added,
- Correction of software defects:
. values error after disturbance avalanche
. calculation of average measurement of UC
. date of event logic input improvement,
. presence of non-acknoledged records bit in Modbus
communication improved,
. the fault record number to display can be modified
using Modbus communication w/o affecting the
displayed fault,
. communication Modbus addresses improved for
reading
. Event tI> signalled after each instantaneous fault
origin,
. correction of auto-acknowledgement of disturbance.

V11.B 12/2007 Software changes implemented in this version V2.14 Hard 5

- Addition of equation logic logic assigned to LED,
- Modification of all equation logic labels (from Equ.x” to
“tEqu.x”,
- Addition of Turkish language,
- Event of latched relays: correction of the modbus
address,
- Setting group can be changed when reverse current is
present,
- “Disturbance trigger” event added in event records,
- Communication Modbus:
. modification of the manual acknowledgement of
oldest event and fault record,
. modification of the disturbance record
acknowledgement status,
. modification of the remote control for disturbances
acknowledgement,
. disturbance record: correction of number of pages
and number of samples in the service frame,
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 25/28

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V11.C 06/2009 Software changes implemented in this version V3.1 Hard 5
- Addition of auxiliary timers in coherence with the
number of opto inputs. tAux5, tAux6 and tAux7 timers
duration can be set up to 20000s (> 5.5 hours),
- Logic equations: opto-inputs state added,
- New inhibited alarms (auxiliary timers and logic
equations),
- German labels updated,
- Correction of:
. settings after password setting (front keyboard)
. ΣAmps(n) counter,
. communication port failure alarm,
. tAux alarm generation
. blocking by “CB fail” of “I> rev” and “Ie> rev”,
. Inrush blocking submenu,
. LED affectation menu on VTS added,
. display of protection (minimum amplitude) after boot
or remote setting,
. HMI trouble after local paswword entering during
data edition with offset,
. AR Cycle tAux settable to start and inhib,
. VTS output display,
. disturbance recording duration,
. events display during CPU load phases.
Hardware changes implemented in this version
- New options added:
. 5 opto-inputs
. IRIG-B + + 2nd rear port,
. IRIG-B + 2nd rear port + 5 opto-inputs
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 26/28 MiCOM P125/P126/P127

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V12.A 09/2009 Software changes implemented in this version V3.1 Hard 5
- New inhibited alarms added (possibility to inhibit
alarm on tAux, I<, U<, P<, Q<, F< and Boolean logic),
- Possibility to operate the CB and to start a
disturbance recording from the relay HMI,
- Possibility to start:
. SOTF using any control close information,
. Cold Load Pickup by 52A or “not I< & I>” or “I0< &
I0>”,
- Total trips number calculated with all the CB
operations,
- Addition of a new derived earth overcurrent threshold,
- Possibility to program autoreclose blocking after a
number of reclose or a defined time,
- Possibility to assign any signal to any LED,
- Disturbance recorder time modified,
- Implementation of the adjustable directionality on the
two threshold independently P> and P>>, Creation of
adjustable directional threshold P< and P<< and four
adjustable directional Under / over reactive power
threshold Q<, Q<<, Q>, Q>>,
- IA, IB, IC & I0 displayed on the same time on relay,
- Front face Led resettable via a logic input selection,
- “79 internal locked” and “79 external locked” assigned
to output signals,

- Selectivity between two relays with tReset +

autorecloser,
- Voltage protection thresholds settable with Ph / Ph or
Ph / N mode,
- Possibility to Inhibit U< or U<< when CB is open,
- The result of a Boolean equation can be used in an
other equation,
- CB Fail added in Boolean equation,
- Correction of:
. the decimal value of DMT temporisation when ≥ 20s,
. absolute time on disturbance record,
. Chinese text on “Output Relay” menu,
. 32bits value in E2PROM with MODBUS Protocol,
. problem of extraction of events with MiCOM S1 using
MODBUS protocol.
Hardware/Software Version P12y/EN VC/E95
History and Compatibility
MiCOM P125/P126/P127 Page 27/28

Relay Type P127

Backward
S1
Software Date of Compatibility
Full Description of Changes Compati-
Version Issue with previous
bility
hardware
V13.A 01/2010 Hardware changes implemented in this version V3.1 Hard 6
- New option added: measurement CT option,
Software changes implemented in this version
- Current transformer supervision added,
- Rate of change of frequency (df/dt) protection added,
- Currents, voltages, powers and energies metering
display added (with measurement CT),
- New record reset order,
- Eight protection setting groups,
- Possibility to copy settings from a group to a 2nd group,
- Communication settings adapted for 2 RS485 port
using IEC60870-5-103,
- “Communication orders” setting added,
- Correction of:
. DNP V3.0 comm.: cold restart and warm restart
answer,
. DNP V3.0 comm.: “multi-fragment responses”
processing,
. default language selection,
. IEC60870-5-103 comm.: event transmission with
ModBus,
. HMI translations,
. disturbance records: storage of start of disturbance,
. frequency value storage after a frequency fault.
. Σ Amps (n) counter reset remote order,
. statistics data storage.
P12y/EN VC/E95 Hardware/Software Version
History and Compatibility
Page 28/28 MiCOM P125/P126/P127

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Publication: P12x/EN T/E95 11/2010