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com

Feeder Terminal REF 541,

Product Guide
REF 543,
REF 545.

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All manuals and user guides at all-guides.com
 All manuals and user guides at all-guides.com
Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG
Issued: June 1999
Status: Updated 
Version: G/28.05.2010 
Data subject to change without notice

Features • Feeder terminal for protection, control, • Additional functions including synchro-
measurement and supervision of medium check, frequency protection, capacitor
voltage networks. bank protection and control.
• Voltage and current measurement via con- • RTD/analogue module for temperature
ventional measuring transformers or cur- measurement, current/voltage measure-
rent sensors and voltage dividers. ment and mA-outputs.
• Fixed human-machine interface including a • Communication over three communication
large graphic display, or an external display interfaces: one for local communication
module for flexible switchgear installation. with a PC and two for simultaneous dual
port communication for e.g. a substation
• Protection functions including e.g. non-
communication system and a substation
directional and directional overcurrent and
monitoring system.
earth-fault protection, residual voltage,
overvoltage and undervoltage protection, • Selectable function block naming: ANSI
thermal overload protection, CBFP and device numbers, IEC symbols or ABB nam-
auto-reclosing. ing.
• Control functions including local and • Support for IEC 61850 protocol through the
remote control of switching objects with SPA-ZC 400 adapter.
synchro-check, status indication of the
• Support for Profibus-DPV1 protocol
switching objects and interlockings on bay
through the SPA-ZC 302 adapter
and station level
• Part of the ABB Distribution Automation
• Measurement of phase currents, phase-to-
system.
phase and phase-to-neutral voltages, neu-
tral current and residual voltage, frequency,
power factor, active and reactive power
and energy.
• Advanced power quality measurement
capabilities. Total harmonic distortion
(THD) measurements for both currents and
voltages. Measurement for short duration
voltage variations like sags, swells and
short interruptions.
• Condition monitoring including circuit-
breaker condition monitoring, trip circuit
supervision and internal self-supervision of
the feeder terminal.
• Time synchronization via binary input. Syn-
chronization pulse once per second or
once per minute.
• Fault locator for short circuits in all kinds of
network and for earth-faults in effectively
earthed and low resistance/low reactance
earthed networks.
Fig. 1 Setting group example window.

3
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Application The REF 541, REF 543 and REF 545 feeder Application area also covers protection func-
terminals are designed to be used for protec- tions for a large variety of applications, e.g.
tion, control, measurement and supervision of frequency and voltage based protection,
medium voltage networks. motor protection, thermal overload protec-
tion, capacitor bank protection and synchro-
They can be used with different kinds of check/voltage check function.
switchgear including single busbar, double
busbar and duplex systems. The protection In addition to protection, measurement, con-
functions also support different types of net- trol and condition monitoring functions, the
works such as isolated neutral networks, reso- feeder terminals are provided with a large
nant-earthed networks and partially earthed amount of PLC functions allowing several
networks.. automation and sequence logic functions
Control room connection needed for substation automation to be inte-
grated into one unit.
RER 111 LON
star-coupler
The data communication properties include
Optical LON bus
the following communications: SPA bus,
CB OK
21 kV
REF 541

LON bus, IEC 60870-5-103, IEC 61850, Pro-

fibus-DPV1, DNP 3.0 or Modbus communi-
AROFF

Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io)

fn = 50 Hz
In = 1/5 A (I)
Un = 100/110 V (U)
1MRS xxxxxx
98150
Uon = 100/110 V (Uo) 9509

cation with higher-level equipment. Further,

LON communication, together with PLC
functions, minimizes the need for hardwiring
between the units.
REF 541
REF 541
REF 541

21 kV
CB OK
21 kV
21 kV
CB OK
CB OK

AROFF

AROFF
AROFF

Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 1MRS xxxxxx

fn = 50 Hz Un = 100/110 V (U) 98150
In = 1/5 A (I) Uon = 100/110 V (Uo) 9509
Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 1MRS xxxxxx
fn = 50 Hz Un = 100/110 V (U) 98150 Uaux = 80...265 Vdc/ac Ion = 1/5 A (Io) 1MRS xxxxxx
In = 1/5 A (I) Uon = 100/110 V (Uo) 9509 fn = 50 Hz Un = 100/110 V (U) 98150
In = 1/5 A (I) Uon = 100/110 V (Uo) 9509

Fig. 2 Distributed protection and control system

based on REF 54_ feeder terminals.

Design The feeder terminals REF 541, REF 543 and Protection functions
REF 545 differ from each other regarding the Protection is one of the most important func-
number of digital inputs and outputs avail- tions of the REF 54_ feeder terminal. The
able. Please, refer to section “Ordering” for protection function blocks (e.g. NOC3Low)
more details. are independent of each other and have e.g.
their own setting groups and data recording.
The REF 54_ feeder terminals incorporate a The non-directional overcurrent protection
wide range of feeder terminal functions: includes e.g. the three stages NOC3Low,
NOC3High and NOC3Inst, each with inde-
• Protection functions pendent protection functions.
• Measurement functions
Either Rogowski coils or conventional cur-
• Disturbance recorder rent transformers can be used for protection
• Power quality functions functions based on current measurement.
Correspondingly, voltage dividers or voltage
• Control functions transformers are used for protection functions
• Fault locator based on voltage measurement
• Condition monitoring functions For further information about functionality
• General functions levels and the protection functions included
in them, refer to the table “Functionality lev-
• Communication functions els, protection functions” in section 
• Standard functions “Ordering”.

The function blocks are documented on the Measurement functions

CD-ROM “Technical Descriptions of Func-
The measurement functions include three-
tions” (1MRS 750889-MCD).
phase currents, neutral current, three-phase
voltages, residual voltage, frequency, active

4
 All manuals and user guides at all-guides.com
Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

and reactive power and power factor. In addi- MIMIC configuration picture displayed on
tion, other measurement functions are avail- the HMI. Position indicators are used to indi-
able. cate the position of switching devices via the
MIMIC picture and to control them locally.
As a standard feature the REF 54_ terminal The status of different objects, e.g. open/
includes pulse counter inputs. The number of close/undefined, displayed in the MIMIC
pulse inputs varies from 7 (REF 541) to 10
view can be freely designed.
(REF 545) according to the REF variant.

Fault locator
Disturbance recorder The fault locator function for radial distribu-
The transient disturbance recorder is able to tion systems. Short-circuit localization in all
record 16 current or voltage waveforms and kind of distribution networks. Earth-fault
16 logic digital signals. The sampling fre-
localization in effectively earthed networks
quency of the analogue inputs is 2 kHz at the and in low reactance/low resistance earthed
rated frequency of 50 Hz and 2.4 kHz at the networks. Assists fast power restoration after
rated frequency of 60 Hz.
the fault. Improves system availability and
The user can set the length of a recording performance.
within a range determined by the number of
analogue inputs used. The number of record- Condition monitoring functions
ings depends on the sampling frequency, Condition monitoring function blocks such as
length of recordings and number of analogue supervision of the energizing current and
inputs.
voltage input circuit, operation time counter,
The recordings can be uploaded with a DR- circuit breaker electric wear, scheduled main-
Collector Tool which converts the data to a tenance, trip circuit supervision and breaker
COMTRADE format. The DR-Collector Tool travel time are available for the REF 54_
is supported in CAP501 and CAP505 relay feeder terminals.
tools.
General functions
Power quality functions Additional functions are available for differ-
Power quality functions enable measurement ent general purposes to be used in logics such
of total harmonic distortion (THD) of voltage as activation of HMI backlight, switchgroups,
and current, and total demand distortion and resetting of operation indications, latched
(TDD) of current. Individual harmonics are output signals, registers and disturbance
measured up to 13th. recorder.
Power quality functions also include mea-
surement of short duration voltage variations Communication functions
like sags, swells and short interruptions. Mea- The REF 54_ feeder terminal provides the
surements are done according to the IEC stan- IEC 60870-5-103, IEC 61850, Profibus-
dard 61000-4-30. DPV1, Modbus, DNP 3.0, SPA and LON
serial communication protocols.
LIB 510 supports tools for presentation of
harmonics and short duration voltage varia- In a customer-specific feeder terminal config-
tions. uration, special events can be generated via
an EVENT230 event function.
Control functions
The control functions are used to indicate the Standard functions
position of switching devices, i.e. circuit Standard functions are used for logics such as
breakers and disconnectors, and to execute interlocking, alarming and control sequenc-
open and close commands for controllable ing. The use of logic functions is not limited
switching devices in the switchgear. Further- and the functions can be interconnected with
more, there are supplementary functions for each other as well as with protection, mea-
control logic purposes, e.g. on/off switches, surement, power quality, control, condition
MIMIC alarm, LED control, numerical data monitoring and general functions. In addition,
for the MIMIC and logic controlled position the digital inputs and outputs as well as LON
selection. inputs and outputs can be connected to stan-
dard functions by using the Relay Configura-
The control functions configured using the tion Tool.
Relay Configuration Tool can be associated
with position indicators that are part of the
5
 All manuals and user guides at all-guides.com
Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Other functions Each analog channel is separately configured

with the Relay Configuration Tool. Both the
Low auxiliary voltage indication measuring unit for each analog channel and
The REF 54_ feeder terminal is provided the type of signal to be measured are to be
with a low auxiliary voltage indication fea- configured.
ture. The power supply module issues an
internal alarm signal when a drop in the A separate scaling factor can be set for each
power supply voltage is detected (ACFail, analogue channel. The factors enable differ-
active low). The alarm signal is activated if ences between the ratings of the protected
the power supply voltage falls about 10% unit and those of the measuring device (CTs,
below the lowest rated DC input voltage of VTs etc.). The setting value 1.00 means that

m
the power supply module. the rated value of the protected unit is exactly
the same as that of the measuring device.
The indication of a low auxiliary voltage is
available in the feeder terminal configuration Calculated analogue channels
and can be connected to any signal output of The REF 54_ feeder terminal includes virtual
the REF 54_. channels to obtain phase-to-phase voltages,

.co
neutral current and residual voltage when
Overtemperature indication sensors are used. Sensors are connected to the
The REF 54_ feeder terminal includes an feeder terminal via coaxial cables and there-
internal temperature supervision function. fore a residual connection of phase currents
The power supply module issues an internal or an open-delta connection of phase voltages
alarm signal when overtemperature has been cannot be made. Both the amplitude and the
detected inside the terminal enclosure. The phase angle are calculated for the virtual
alarm signal will be activated once the tem- channels.
es
perature inside the terminal enclosure
increases to +78C (+75...+83C). Over- Though primarily meant to be used with sen-
temperature indication is available in the sors, the calculated analogue channels can
feeder terminal configuration and can be con- also be used with conventional current and
nected to any signal output of the terminal. voltage transformers.

Analog channels Note! When sensitive earth-fault protection is

uid

The feeder terminal measures the analogue needed, core balance transformers are not
signals needed for protection, measuring, etc. recommended to be replaced with the numer-
via sensors or galvanically separated match- ically derived sum of phase currents. Nor-
ing transformers. mally, an earth-fault setting below 10% of the
rated value requires the use of a core balance
Depending on whether sensors are included transformer.
or not, REF 54_ feeder terminals have 9
(without sensors) or 10 (with sensors) ana- Digital inputs
-g

logue channels. The number of channels used The digital inputs of the feeder terminals are
depends on the feeder terminal configuration voltage-controlled and optically isolated. The
and the kind of matching transformers or sen- function of a digital input can be inverted.
sor inputs used. Furthermore, the feeder ter- The programmable filter time removes
minal includes virtual analogue channels for debounces and short disturbances on a digital
calculating the phase-to-phase voltages, neu- input. The filter time can be set for each digi-
all

tral current and residual voltage from phase tal input separately.
currents and voltages.
Some specific digital inputs can be pro-
In addition to 9 conventional matching trans- grammed to operate either as digital inputs, as
formers, sensors developed by ABB can be pulse counters or as used for time synchroni-
used parallel in REF 54_ feeder terminals. zation. When a digital input operates as a
The feeder terminal has 9 sensor inputs. A pulse counter, pulse counting frequency can
current sensor (Rogowski coil) or a voltage be up to100 Hz.
divider can be connected to each sensor input.
Please, see the connection diagram for Oscillation suppression
details. When ordering, please note the type The feeder terminals have two global parame-
of analogue inputs. ters for the suppression of digital input oscil-
lation. The settings of these parameters

6
 All manuals and user guides at all-guides.com
Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

determine the oscillation level and hysteresis Alarm LED indicators

for all digital inputs. Event is generated in The feeder terminal offers eight alarm LED
case oscillation is detected. indicators to be configured with the Relay
Mimic Editor. The LED colours (green, yel-
Attributes of a digital input for feeder ter- low, red), their use, and the ON and OFF state
minal configuration texts can be freely defined. Three basic oper-
For each digital input, the status of the input ation modes are supported: non-latched,
(value), the time tag for the status change latched-steady and latched flashflashing.
(time) and the validity of the digital input Alarms can be acknowledged remotely,
(invalidity) can be issued by the attributes. locally or by using logic of the feeder termi-
These attributes are available in the feeder nal.
terminal configuration and can be used for
various purposes. The alarm channels include time tagging for
detected alarms. The time tagging principle
RTD/analogue inputs used depends on the operation mode.
The REF 541 and REF 543 feeder terminals
equipped with an RTD/analogue module Interlocking LED indicator
(RTD1) have eight general purpose analogue The interlocking LED indicates that control
inputs for DC measurement. The RTD/ana- operation has been interlocked or that the
logue inputs are galvanically isolated from interlocking is in bybass mode, e.g. when
the feeder terminal power supply and enclo- control is possible despite of interlocking.
sure. However, the inputs have a common
ground. The general purpose RTD/analogue Trip Circuit Supervision
inputs accept voltage-, current- or resistance- The purpose of this function is to supervise
type signals. For each measuring mode, a the tripping circuitry of the circuit breaker.
separate parameter is provided for choosing An alarm will be generated in case a faulty
between the available measurement ranges. tripping circuit, e.g. a circuit is not able to
RTD/analogue inputs can be applied for e.g. perform a trip, is detected.
temperature measurement.
The supervision is based on the constant-cur-
Digital outputs rent injection through the tripping circuitry.
The outputs of the feeder terminal are catego-
rized as follows:
Display panel
• HSPO: High-speed power output, double- The feeder terminal is provided with either a
pole contact, preferred for tripping pur- fixed display or an external display module.
poses and for circuit breaker and discon- The external display module requires a sepa-
nector control rate voltage supply from a common source
with the main unit. The display consists of 19
• PO: Power output, either single-pole or rows divided into two windows: a main win-
double-pole contact, preferred for circuit dow (17 rows) and an assisting window
breaker and disconnector control (2 rows).

• SO: Signal output, either NO (Normally The graphic display presents detailed infor-
Open) or NO/NC (Normally Open/Nor- mation on MIMIC, objects, events, measure-
mally Closed) contact. The output contact ments, control alarms, and parameters. The
is a normal-duty contact and cannot be assisting window is used for terminal-depen-
used for controlling a heavy load such as a dent indications/alarms and help messages.
circuit breaker.
Additionally, the panel includes the following
Analogue outputs HMI items:
The REF 541 and REF 543 feeder terminals
equipped with an RTD/analogue module have • three push-buttons for object control (I, O,
four general purpose 0...20 mA analogue cur- object selection)
rent outputs. All outputs are galvanically iso- • eight freely programmable alarm LEDs
lated from the supply and enclosure of the with different colours and modes accord-
feeder terminal and from each other. ing to the configuration
• LED indicator for control interlocking
Analogue outputs can be utilized for transfer- • three protection LED indicators
ring any measured or calculated information • HMI push-button section with four arrow
to panel meters or e.g. PLCs. buttons and buttons for clear and enter
7
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

• optically isolated serial communication IEC 61850 communication using SPA-ZC

port 400 on the rear connector X3.2
• backlight and contrast control The 9-pin D-type subminiature male connec-
• freely programmable button (F) which can tor (RS-232 connection) on the rear panel
be used in the configuration of the feeder connects the feeder terminal to the distribu-
terminal tion automation system via the IEC 61850
protocol. In the IEC 61850 mode, the SPA-
• a button for remote/local control
ZC 400 Bus Connection Module is needed.
HMI has two main levels, the user level and
the technical level. The user level is for Profibus-DPV1 communication using SPA-
“everyday” measurements and monitoring ZC 302 on the rear connector X3.2
whereas the technical level is intended for The 9-pin D-type subminiature male connec-
advanced feeder terminal programming. tor (RS-232 connection) on the rear panel
connects the feeder terminal to the distribu-
Serial communication tion automation system via the Profibus pro-
The feeder terminal has three serial commu- tocol. The interface between the feeder
nication ports, one on the front panel and two terminal and Profibus can be made through
on the rear panel. the SPA-ZC 302 Gateway.

Front panel optical connection for PC LON/SPA bus communication on the rear
connector X3.3
The front panel is intended for the connection
of a PC for configuring the feeder terminal The 9-pin D-type subminiature female con-
nector (RS-485 connection) on the rear panel
with the CAP 50_ tools. The front interface
uses the SPA bus protocol. connects the feeder terminal to the substation
automation system via the SPA bus or the
LON bus. The fibre-optic interface module
The optical connector on the front panel iso-
type RER 103 is used to connect the feeder
lates the PC galvanically from the feeder ter-
terminal to the fibre-optic communication
minal. The front connector for the PC is
bus. The RER 103 module supports both SPA
standardized for ABB relay products and
bus and LON bus communication.
requires a specific opto cable. The cable is
connected to the serial RS-232 port of the PC.
The other communication parameters for the Self-supervision
rear RS-485 interface are also set in the Com- The feeder terminal REF 54_ is provided
munication menu of the REF 54_ feeder ter- with an extensive self-supervision system.
minal. The self-supervision system handles run-time
fault situations and informs the user of faults
SPA/IEC_103 communication on the rear via the HMI and LON/SPA bus communica-
connector X3.2 tion.
The 9-pin D-type subminiature male connec-
tor (RS-232 connection) on the rear panel When a fault has been detected, the green
connects the feeder terminal to the distribu- Ready indicator starts flashing, a fault indica-
tion automation system via the SPA bus or the tion text is displayed on the HMI and an
IEC_103. The fibre-optic interface module event 0/E57 is generated. The fault indication
type RER 123 is used for connecting the text on the HMI consists of two rows: a gen-
feeder terminal to the fibre-optic communica- eral message ‘internal fault’, followed by the
tion bus for SPA and IEC_103 protocol. generated IRF code of the fault.
DNP3.0/Modbus communication on the The relay will try to recover from a fault
rear connector X3.2
either by restarting the module (I/O module
The 9-pin D-type subminiature male connec-
or HMI) that reported the fault, or by restart-
tor (RS-232 connection) on the rear panel ing the whole relay. During restarting the IRF
connects the feeder terminal to the distribu- state will remain active until the internal self-
tion automation system via the DNP 3.0 or
supervision program has determined that the
the Modbus protocol. The interface between
relay is operating normally. If the fault is still
the feeder terminal and a RS-485 communi-
persistent after restarting three times, the
cation bus can be made through the RER 133
relay will be in permanent IRF state.
Bus Connection Module. The interface
between the feeder terminal and an optical
bus can be made through the RER 123 Bus
Connection Module.

8
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Feeder terminal configuration Lon network configuration

The Relay Configuration Tool, based on the The LON Network Tool is used for binding
IEC 61131-3 standard, is used for configuring network variables between RED 500 termi-
the basic terminal, protection and logic func- nals. Typically, LON is used for transferring
tion blocks, control and measurement func- object status data (open, close, undefined)
tions, timers and other functional elements between units for interlocking sequences run-
included in the logic functions category. ning in the units.

The programmable system of REF 54_ feeder DNP 3.0 and Modbus configuration
terminals allows the output contacts to be The Protocol Mapping Tool included in the
operated in accordance with the state of the CAP 505 is used for configuring the DNP 3.0
logic inputs and the outputs of the protection, and Modbus interfaces of the feeder terminal.
control, measurement and condition monitor-
ing functions. The PLC functions (e.g. inter- Feeder terminal
locking and alarm logic) are programmed parameterization
with Boolean functions, timers, counters, The parameters of the feeder terminal units
comparators and flip-flops. The program is can be set either locally over the HMI or
written in a function block diagram language externally via the serial communication.
by using the configuration software.
Local parameterization
Mimic configuration When the parameters are set locally via the
The control functions configured using the HMI, the setting parameters can be chosen
Relay Configuration Tool can be associated from the hierarchical menu structure. The
with position indicators that are part of the desired language for parameter description
MIMIC configuration picture displayed on can be selected.
the graphic LCD of the HMI. The MIMIC
configuration picture is designed with the External parameterization
Relay Mimic Editor. In addition, the editor is The Relay Setting Tool is used for parameter-
used to define the eight programmableLED izing and setting the feeder terminals exter-
indicators and the corresponding alarm texts nally. The parameters can be set off-line on a
on the front panel, the alarm modes, and the PC and downloaded to the feeder terminal
interlocking LED texts. over a communication port. The menu struc-
ture of the setting tool, including views for
The MIMIC picture may include a single-line parameterization and settings, is the same as
diagram, measured values with units, free the menu structure of the feeder terminal.
texts, etc. The position indicators (open,
closed, undefined) are drawn according to the
customer's requirements. Note that the opera- Terminal connections
tion of the objects themselves is determined All external circuits are connected to the ter-
by means of the Relay Configuration Tool. minal blocks on the rear panel. The terminal
block for the measuring transformers consists
All of the eight alarm function blocks can be of fixed screw terminals.
configured in the same alarm view of the
mimic editor. ON and OFF state texts (only ABB sensors (Rogowski coil or voltage
one language version at a time can be sup- divider) are connected to the feeder terminal
ported for the alarm) and LED colours can be with special type of shielded twin BNC con-
defined. Three different colours can be used nectors. This type of connectors are used to
to define the ON and OFF state. Three basic improve reliability and protection against dis-
modes are available: turbances. Unused sensor inputs must be
short-circuited with special connectors, type
• non-latched 1MRS 120515.

• latched-steady The RS232 serial interface on the rear panel

is used to connecting the feeder terminal to
• latched flashing the SPA, the IEC_103, Modbus, DNP 3.0,
Profibus, or IEC 61850 bus. The SPA,
Interlocking LED texts can also be defined in IEC_103, Modbus and DNP 3.0 bus is con-
the same alarm view but the colour of the nected through RER 123 Bus Connection
interlocking LED cannot be changed. Module. DNP 3.0/Modbus can also be con-
nected through the RER 133 Bus Connection
Module.
9
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Profibus is available through the SPA-ZC 302 The digital input and output contacts of the
Gateway and IEC 61850 is available through feeder terminal are connected to the multi-
the SPA-ZC 400 Ethernet Adapter pole connectors.

The serial interface RS-485 on the rear panel Protective earth is connected to the screw
is used for connecting the feeder terminal to marked with the earth symbol.
the SPA bus or the LON bus. The SPA/LON
bus is connected via the RER 103 Connection
Module fitted to the 9-pin D-type subminia-
ture connector and screwed to the rear panel.

Basic connection diagrams

+
L1 L3
Q1 A
0 -
+
Q0 N
n
*) X4.1
+ +
- I
1
Q9 a
da dn
PS1_4_ACFail Mains
2
-
PS1_4_TempAlarm
X1.1
27 100V Ch 10, VT4 X3.2
25 SERIAL BUS
L1 L3 24
P1 S1 100V Ch 9, VT3
X3.3
22 SERIAL BUS
21
100V Ch 8, VT2
S2 19 X4.1
3
P2 18
100V Ch 7, VT1
IRF 4
16
S1 15 0,2A
14 1A Ch 6, CT5 5
13
12 6
1A
S2 11 5A
Ch 5, CT4
10
9 7
1A
8 5A PS1_4_HSPO3 9
Ch 4, CT3 8
7
6 1A 10 + +
5 5A Ch 3, CT2
4 External
3 1A PS1_4_HSPO1 11 0 open
2 5A 13
Ch 2, CT1
1 PS1_4_TCS1 TCS1 12 **)
15 + +
X2.1 Ch 10, sensor
DIFF
External
X2.2
PS1_4_HSPO2 16 1 close
Ch 9, sensor 18
DIFF
PS1_4_TCS2 TCS2 17
X2.3 Ch 8, sensor
DIFF

X2.4 Ch 7, sensor
DIFF

X4.2
X2.5 Ch 5, sensor
DIFF
8

X2.6 Ch 4, sensor
Disconnector Q1
DIFF 9 Close
PS1_4_HSPO4 11
X2.7 Ch 3, sensor 10
DIFF
12
X2.8 DIFF
Ch 2, sensor Disconnector Q1
PS1_4_HSPO5
13 Open
X2.9 Ch 1, sensor 15
DIFF 14
16
17

X4.2
1 PS1_4_SO1 18
2 PS1_4_BI1

4 PS1_4_BI2
5
6 PS1_4_BI3
7
X5.2
3
X5.1
1
BIO1_5_BI1 BIO1_5_SO1 4
- 2
3 5
BIO1_5_BI2

4 6
BIO1_5_SO2
BIO1_5_BI3
- 5 7
6 9
BIO1_5_BI4

7 8
BIO1_5_SO3
BIO1_5_BI5
- 8 10
9 12
BIO1_5_BI6
11
- 10
BIO1_5_BI7
BIO1_5_SO4
11 13
15
12
BIO1_5_BI8
*) Power flow direction 14
13 BIO1_5_SO5
BIO1_5_BI9 16
14
**) Example connection 18
15
16 BIO1_5_BI10
17
17 BIO1_5_SO6
18 BIO1_5_BI11

X5.2
1
BIO1_5_BI12
2

REF 541
(1MRS 090115-AABA/BABA/CABA)

A050202

Fig. 3 Basic connection diagram of REF 541.

10
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

+
+ Q1 Q2
L1 L3
A
+ 0
Q0
N
+
Q3 n
X4.1
+
*) Mains 1 I
+ PS1_4_ACFail

Q9 a - 2
da dn
PS1_4_TempAlarm

X1.1
27 X3.2
100V Ch 10, VT4 SERIAL BUS
25
L1 L3 24
P1 S1 100V Ch 9, VT3
X3.3
22 SERIAL BUS
21
100V Ch 8, VT2
S2 19 X4.1
P2 18 IRF 3

m
100V Ch 7, VT1 4
16
S1 15 0,2A
14 1A Ch 6, CT5
5
13
12 1A 6
S2 + _
11 5A
Ch 5, CT4
10
9 1A 7
8 5A
Ch 4, CT3
PS1_4_HSPO3 9
0 External
8
7
_ open
6 1A 10
5 5A
Ch 3, CT2
4
3 1A PS1_4_HSPO1 11 **)
+ + _
2 5A Ch 2, CT1 13
1 PS1_4_TCS1 TCS1
12
_

.co
X2.1 Ch 10, sensor
15
1 External
DIFF
close
X2.2 PS1_4_HSPO2 16
DIFF
Ch 9, sensor
PS1_4_TCS2 TCS2
18 +
17
X2.3
DIFF
Ch 8, sensor

X2.4
DIFF
Ch 7, sensor
X4.2
X2.5 Ch 5, sensor
DIFF 8
X2.6
Disconnector Q1
Ch 4, sensor Close
DIFF
9
PS1_4_HSPO4 11
X2.7 Ch 3, sensor 10
DIFF
12 Disconnector Q1
X2.8
DIFF
Ch 2, sensor Open
13
X2.9 Ch 1, sensor PS1_4_HSPO5 15
DIFF
14
16
17

X4.2
es
1 PS1_4_SO1 18
2 PS1_4_BI1

4 PS1_4_BI2
5
6 PS1_4_BI3
7
X5.2
3
X5.1
1
BIO1_5_BI1
- 2 BIO1_5_SO1 4
3 5
BIO1_5_BI2
4 6
BIO1_5_BI3 BIO1_5_SO2
- 5 7
6 9
BIO1_5_BI4
uid

7 8
BIO1_5_SO3
- 8 BIO1_5_BI5
10
9 12
BIO1_5_BI6
11
10 BIO1_5_SO4
BIO1_5_BI7
- 11 13
15
12
BIO1_5_BI8
13 14
BIO1_5_SO5
BIO1_5_BI9 16
14 18
15
BIO1_5_BI10
16
17
17 BIO1_5_SO6
BIO1_5_BI11
18

X5.2 X7.1
1
BIO1_5_BI12
2
17
BIO2_7_PO1 18
-g

X7.2
X7.1 1
BIO2_7_PO2 2
1
BIO2_7_BI1
- 2
3
3
BIO2_7_BI2 Disconnector Q2
4 BIO2_7_PO3 4 Close
BIO2_7_BI3 5
5 6
*) Power flow direction 6
BIO2_7_BI4 7
**) Example connection Disconnector Q2
7 Open
BIO2_7_BI5 BIO2_7_PO4 8
8 9
10
9
BIO2_7_BI6 11
Disconnector Q3
all

10
BIO2_7_BI7
11 BIO2_7_PO5 12 Close
13
12 14
BIO2_7_BI8
15
13 Disconnector Q3
BIO2_7_BI9
14
BIO2_7_PO6
16 Open
15 17
18
16 BIO2_7_BI10

REF 543
(1MRS 090127-AABA/BABA/CABA)

A050203

Fig. 4 Basic connection diagram of REF 543.

11
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

+
+ Q1 Q2
L1 L3
A
+ 0
Q0
N
+
Q3 n
X4.1
*) +
+
a PS2_4_ACFail 1 I
Q9 da dn PS2_4_TempAlarm
Mains
- 2

X1.1
27 X3.2
100V
Ch 10, VT4 SERIAL BUS
25
L1 L3 24
P1 S1 100V
Ch 9, VT3 X3.3
22 SERIAL BUS
21
100V
Ch 8, VT2
S2 19 X4.1
3
P2 18
100V IRF 4
Ch 7, VT1
16
S1 15 0,2A
14 1A
Ch 6, CT5 5
+ _
13
12 1A 6
S2 11 5A
Ch 5, CT4
10
7 External
9
8
1A
5A
Ch 4, CT3
PS2_4_HSPO3 9 0 open
7 8 _
6 1A 10
5
4
5A
Ch 3, CT2 **)
11
+ _
3
2
1A
5A
Ch 2, CT1
PS2_4_HSPO1
13 +
PS2_4_TCS1 TCS1 12
1
15
_ External
X2.1
DIFF
Ch 10, sensor 1 close
X2.2 PS2_4_HSPO2 16
Ch 9, sensor
DIFF
PS2_4_TCS2 TCS2
18
17
+
X2.3 Ch 8, sensor
DIFF

X2.4 Ch 7, sensor
DIFF X4.2
1
X2.5 Ch 5, sensor
DIFF Disconnector Q1
X2.6 PS2_4_HSPO4 *)
2 Close
Ch 4, sensor 4
DIFF
3
X2.7 Ch 3, sensor 5
DIFF

Disconnector Q1
X2.8 Ch 2, sensor 6
DIFF
PS2_4_HSPO5 8 Open
7
X2.9 Ch 1, sensor
DIFF 9
Disconnector Q2
10 Close
X5.1 PS2_4_HSPO6 12
11
1
BIO1_5_BI1 13
- 2
3 Disconnector Q2
BIO1_5_BI2
PS2_4_HSPO7
14
16
Open
4 15
BIO1_5_BI3
- 5
6
BIO1_5_BI4 PS2_4_HSPO8 17
18
7
BIO1_5_BI5
- 8
9 X5.2
BIO1_5_BI6 3

10
BIO1_5_BI7 BIO1_5_SO1 4
- 11
5
12
BIO1_5_BI8
6
13 BIO1_5_SO2
BIO1_5_BI9 7
14
9
15
BIO1_5_BI10
16
8
17 BIO1_5_SO3
BIO1_5_BI11 10
18
12

X5.2
11
BIO1_5_SO4
1
BIO1_5_BI12 13
2 15

14
BIO1_5_SO5
16
X6.1 18
1
BIO1_6_BI1
- 2 17
3 BIO1_5_SO6
BIO1_6_BI2
X6.2
4 3
BIO1_6_BI3
5
6 4
BIO1_6_BI4 BIO1_6_SO1
5
*) Power flow direction 7
BIO1_6_BI5
8 6
9 BIO1_6_SO2
BIO1_6_BI6 7
9
10
BIO1_6_BI7
11 8
BIO1_6_SO3
12 10
BIO1_6_BI8
12
13
BIO1_6_BI9
14 11
BIO1_6_SO4
15 13
BIO1_6_BI10
16 15
17
BIO1_6_BI11 14
18
BIO1_6_SO5
16
18
X6.2
1 17
BIO1_6_BI12 BIO1_6_SO6
2
X7.1

X7.1
1 17
BIO2_7_BI1 BIO2_7_PO1 18
2
3 X7.2
BIO2_7_BI2
1
4 BIO2_7_PO2 2
BIO2_7_BI3
5
3
6
BIO2_7_BI4
Disconnector Q3
7 4 Close
BIO2_7_BI5 BIO2_7_PO3 5
8 6
9 7
BIO2_7_BI6

10
Disconnector Q3
11
BIO2_7_BI7
BIO2_7_PO4
8
9
Open
12 10
BIO2_7_BI8 11

13
14 BIO2_7_BI9 12
BIO2_7_PO5 13
15 14
16 BIO2_7_BI10 15

16
BIO2_7_PO6 17
REF 545 18
(1MRS 090133-AABA/BABA/CABA)

A050204

Fig. 5 Basic connection diagram of REF 545.

12
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

A050205

Fig. 6 Terminal diagram of the RTD/analog module

Auxiliary voltage The feeder terminal is provided with a 48-

For its operation, the REF 54_ terminal, hour capacitor back-up protection that
including the external display module, enables the internal clock to keep time in case
requires a secured auxiliary voltage supply. of an auxiliary power failure.
The feeder terminal’s internal power supply
module forms the voltages required by the Power supply
feeder terminal electronics. The power supply There are two basic types of power supply
module is a galvanically isolated (fly-back modules available for the REF 54_: type
type) dc/dc converter. A green protection PS1/_ and type PS2/_. See Tecnical data table
LED indicator on the front panel is lit when 9.The operating range of digital inputs
the power supply module is in operation. depends on the type of the power supply
module. See Technical data table 10.

13
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Technical data .

Table 1: General functions

Function Description
INDRESET Resetting of operation indicators, latched output signals, registers
and waveforms i.e. the disturbance recorder
MMIWAKE Activation of HMI backlight
SWGRP1 Switchgroup SWGRP1
SWGRP2 Switchgroup SWGRP2
SWGRP3 Switchgroup SWGRP3
... ...
SWGRP20 Switchgroup SWGRP20

Table 2: Standard functions

Function Description
ABS Absolute value
ACOS Principal arc cosine
ADD Extensible adder
AND Extensible AND connection
ASIN Principal arc sine
ATAN Principal arc tangent
BITGET Get one bit
BITSET Set one bit
BOOL_TO_* Type conversion from BOOL to WORD / USINT / UINT / UDINT /
SINT / REAL / INT / DWORD / DINT / BYTE
BOOL2INT Type conversion from BOOL inputs to INT output
BYTE_TO_* Type conversion from BYTE to WORD / DWORD
COMH Hysteresis comparator
COS Cosine in radians
CTD Down-counter
CTUD Up-down counter
CTU Up-counter
DATE_TO_UDINT Type conversion from DATE to UDINT
DINT_TO_* Type conversion from DINT to SINT / REAL / INT
DIV Divider
DWORD_TO_* Type conversion from DWORD to WORD / BYTE
EQ Extensible comparison to equal
EXP Natural exponential
EXPT Exponentiation
F_TRIG Falling edge detector
GE Extensible comparison to greater or equal
GT Extensible comparison to greater
INT_TO_* Type conversion from INT to REAL / DINT
INT2BOOL Type conversion from INT input to BOOL outputs
LE Extensible comparison to less or equal
LIMIT Limitation
LN Natural logarithm
LOG Logarithm base 10
LT Extensible comparison to less
MAX Extensible maximum
MIN Extensible minimum
MOD Modulo
MOVE Move
MUL Extensible multiplier
MUX Extensible multiplexer

14
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 2: Standard functions

Function Description
NE Comparison to greater or less
NOT Complement
OR Extensible OR connection
R_TRIG Rising edge detector
REAL_TO_* Type conversion from REAL to USINT / UINT / UDINT / SINT / INT /
DINT
ROL Rotate to left
ROR Rotate to right
RS Reset dominant bistable function block
RS_D Reset dominant bistable function block with data input
SEL Binary selection
SHL Bit-shift to left
SHR Bit-shift to right
SIN Sine in radians
SINT_TO_* Type conversion from SINT to REAL / INT / DINT
SUB Subtractor
SQRT Square root
SR Set dominant bistable function block
XOR Extensible exclusive OR connection
TAN Tangent in radians
TIME_TO_* Type conversion from TIME to UDINT / TOD / REAL
TOD_TO_* Type conversion from TOD to UDINT / TIME / REAL
TOF Off-delay timer
TON On-delay timer
TP Pulse
TRUNC_* Truncation toward zero
UDINT_TO_* Type conversion from UDINT to USINT / UINT / REAL
UINT_TO_* Type conversion from UINT to USINT / UDINT / REAL / BOOL
USINT_TO_* Type conversion from USINT to UINT / UDINT / REAL
WORD_TO_* Type conversion from WORD to DWORD / BYTE

Table 3: Condition monitoring functions

Function ANSI IEC Description
device no. symbol
CMBWEAR1 CB wear1 CB wear1 Circuit-breaker electric wear 1
CMBWEAR2 CB wear2 CB wear2 Circuit-breaker electric wear 2
CMCU3 MCS 3I MCS 3I Supervision function of the energizing current input circuit
CMGAS1 CMGAS1 GAS1 Gas pressure monitoring
CMGAS3 1) CMGAS3 GAS3 Three-pole gas pressure monitoring
CMSCHED CMSCHED SCHED Scheduled maintenance
CMSPRC1 CMSPRC1 SPRC1 Spring charging control 1
CMTCS1 TCS1 TCS1 Trip circuit supervision 1
CMTCS2 TCS2 TCS2 Trip circuit supervision 2
CMTIME1 TIME1 TIME1 Operate time counter 1 for the operate time used (e.g. motors)
CMTIME2 TIME2 TIME2 Operate time counter 2 for the operate time used (e.g. motors)
CMTRAV1 CMTRAV1 TRAV1 Breaker travel time 1
CMVO3 MCS 3U MCS 3U Supervision function of the energizing voltage input circuit
1) This function is only supported in the feeder terminal
revisions of Release 2.0 or later.

15
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 4: Control functions

Function ANSI IEC symbol Description
device no.
CO3DC1 CO3DC1 I<->O 3DC1 Three-state disconnector (1) with indication
CO3DC2 CO3DC2 I<->O 3DC2 Three-state disconnector (2) with indication
COCB1 COCB1 I<->O CB1 Circuit breaker 1 control with indication
COCB2 COCB2 I<->O CB2 Circuit breaker 2 control with indication
COCBDIR COCBDIR CBDIR Direct open for CBs via HMI

m
CODC1 CODC1 I<->O DC1 Disconnector 1 control with indication
CODC2 CODC2 I<->O DC2 Disconnector 2 control with indication
CODC3 CODC3 I<->O DC3 Disconnector 3 control with indication
CODC4 CODC4 I<->O DC4 Disconnector 4 control with indication
CODC5 CODC5 I<->O DC5 Disconnector 5 control with indication

.co
COIND1 COIND1 I<->O IND1 Switching device 1 indication
COIND2 COIND2 I<->O IND2 Switching device 2 indication
COIND3 COIND3 I<->O IND3 Switching device 3 indication
COIND4 COIND4 I<->O IND4 Switching device 4 indication
COIND5 COIND5 I<->O IND5 Switching device 5 indication
COIND6 COIND6 I<->O IND6 Switching device 6 indication
COIND7 COIND7 I<->O IND7 Switching device 7 indication
COIND8 COIND8 I<->O IND8 Switching device 8 indication
es
COLOCAT COLOCAT I<->O POS Logic-controlled control position selector
COPFC 1) 55 COPFC Power factor controller
COSW1 COSW1 SW1 On/off switch 1
COSW2 COSW2 SW2 On/off switch 2
COSW3 COSW3 SW3 On/off switch 3
COSW4 COSW4 SW4 On/off switch 4
uid

MMIALAR1 ALARM1 ALARM1 Alarm channel 1, LED indicator

MMIALAR2 ALARM2 ALARM2 Alarm channel 2, LED indicator
MMIALAR3 ALARM3 ALARM3 Alarm channel 3, LED indicator
MMIALAR4 ALARM4 ALARM4 Alarm channel 4, LED indicator
MMIALAR5 ALARM5 ALARM5 Alarm channel 5, LED indicator
MMIALAR6 ALARM6 ALARM6 Alarm channel 6, LED indicator
MMIALAR7 ALARM7 ALARM7 Alarm channel 7, LED indicator
MMIALAR8 ALARM8 ALARM8 Alarm channel 8, LED indicator
-g

MMIDATA1 MMIDATA1 MMIDATA1 MIMIC data monitoring point 1

MMIDATA2 MMIDATA2 MMIDATA2 MIMIC data monitoring point 2
MMIDATA3 MMIDATA3 MMIDATA3 MIMIC data monitoring point 3
MMIDATA4 MMIDATA4 MMIDATA4 MIMIC data monitoring point 4
MMIDATA5 MMIDATA5 MMIDATA5 MIMIC data monitoring point 5
all

1) This function is only supported in the feeder terminal

revisions of Release 2.0 or later.

16
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Power factor controller settings

Power factor controller, COPFC
The number of capacitor banks to be controlled 1...4
The relational step sizes and the type of the switching 1:1:1:1 linear; 1:1:1:1 circul.; 1:1:2:2 circul.;
sequence 1:2:2:2 linear; 1:2:2:2 circul.; 1:2:4:4 linear;
1:2:4:4 circul.; 1:2:4:8
Size of the first capacitor bank (should be the smallest) 10.0...50000.0 kvar
Target value for daytime cos  0.70...1.00
Day unit Inductive; Capacitive
Target value for night-time cos  0.70...1.00
Night unit Inductive; Capacitive
Setting the reconnection inhibit time (discharge time) 0.5...6000.0 s
Sensitivity in the inductive side 60.0...200.0%
Sensitivity in the capacitive side 0.0...100.0%
Alarm limit for the maximum reactive power 0.1...100.0 Mvar
Alarm limit for the minimum reactive power -100.0...0.0 Mvar
Overvoltage limit when the switching in is inhibited 0.80...1.60 x Un
Operation mode Not in use; Automatic mode; Manual mode;
Testing mode
Starting the automatic testing sequence Not activated; Start
Calculation method Normal; Integral
Control principle Progressive; Direct
Duration demand 0.5...6000.0 s
Day&night switch Not in use; Digital input; Internal clock;
By setting
Manual command Not activated; Remove one step; Add one
step; Disconnect all
Recorded data
Number of switching operations per day 0...65535
Number of switching operations per week 0...65535
Operation accuracies 2.0% of set value or 0.02 x rated value
Accuracy class of operation 2.0

Table 5: Measurement functions

Function ANSI IEC Description
device no. symbol
MEAI1 2) AI1 AI1 General measurement 1 / analog input on RTD/analog module
MEAI2 2) AI2 AI2 General measurement 2 / analog input on RTD/analog module
MEAI3 2) AI3 AI3 General measurement 3 / analog input on RTD/analog module
MEAI4 2) AI4 AI4 General measurement 4 / analog input on RTD/analog module
MEAI5 2) AI5 AI5 General measurement 5 / analog input on RTD/analog module
MEAI6 2) AI6 AI6 General measurement 6 / analog input on RTD/analog module
MEAI7 2) AI7 AI7 General measurement 7 / analog input on RTD/analog module
MEAI8 2) AI8 AI8 General measurement 8 / analog input on RTD/analog module
MEAO1 2) AO1 AO1 Analog output 1 on RTD/analog module
MEAO2 2) AO1 AO1 Analog output 2 on RTD/analog module
MEAO3 2) AO3 AO3 Analog output 3 on RTD/analog module
MEAO4 2) AO4 AO4 Analog output 4 on RTD/analog module
MECU1A Io Io Neutral current measurement, stage A
MECU1B Io_B Io_B Neutral current measurement, stage B
MECU3A 3I 3I Three-phase current measurement, stage A
MECU3B 2) 3I_B 3I_B Three-phase current measurement, stage B
MEDREC16 DREC DREC Transient disturbance recorder
1)

17
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 5: Measurement functions

Function ANSI IEC Description
device no. symbol
MEFR1 f f System frequency measurement
MEPE7 PQE PQE Three-phase power and energy measurement
MEVO1A Uo Uo Residual voltage measurement, stage A
MEVO1B 2) Uo_B Uo_B Residual voltage measurement, stage B
MEVO3A 3U 3U Three-phase voltage measurement, stage A
MEVO3B 2) 3U_B 3U_B Three-phase voltage measurement, stage B
1) These functions are only supported in the feeder termi- 2) These functions are only supported in the feeder termi-
nal revisions of Release 1.5 or later nal revisions of Release 2.0 or later.

Measurement function settings

General measurement/ analogue input on RTD/analogue module, MEAI1...8 (AI1...AI8)
The general measurement function blocks can be used to measure general purpose dc or ac voltage
signals with a sensor input. They also include a REAL type input which can be used to monitor any internal
REAL type IEC 61131-3 based signal, e.g. input data from the RTD/analogue module.
GE1…3 (V dc/ac) -10000.00000...10000.00000
General REAL type input -10000.00000...10000.00000

Neutral current measurement, MECU1A and MECU1B (Io, Io_B)

Io (A) 0.0…20000.0 A
Io (%) 0.0…80.0% In

Three-phase current measurement, MECU3A and MECU3B (3I, 3I_B)

IL1 0.0…20000.0 A
IL2 0.0…20000.0 A
IL3 0.0…20000.0 A
IL1 0.0…1000.0% In
IL2 0.0…1000.0% In
IL3 0.0…1000.0% In
IL1 demand 0.0…20000.0 A
IL2 demand 0.0…20000.0 A
IL3 demand 0.0…20000.0 A
IL1 demand 0.0…1000.0% In
IL2 demand 0.0…1000.0% In
IL3 demand 0.0…1000.0% In

Transient disturbance recorder for 16 analogue channels, MEDREC16 (DREC)

The transient disturbance recorder MEDREC16 is used for recording the current and voltage waveforms,
as well as the status data of internal IEC 61131-3 based logic signals and digital inputs connected to the
feeder terminals. The maximum number of analogue inputs and logic signals is 16. One fundamental cycle
contains 40 samples.
Operation mode Saturation
Overwrite
Extension
Pre-trg time 0…100%
Over limit ILx 0.00…40.00 x In
Over limit Io 0.00…40.00 x In
Over limit Iob 0.00…40.00 x In
Over limit Uo 0.00…2.00 x Un
Over limit Ux 0.00…2.00 x Un
Over limit Uxy 0.00…2.00 x Un
Over limit U12b 0.00…2.00 x Un
Over limit ILxb 0.00…40.00 x In
Under limit Ux 0.00…2.00 x Un
Under limit Uxy 0.00…2.00 x Un
AI filter time 0.000…60.000 s

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Analogue output on RTD/analogue module, MEAO1...4 (AO1...AO4)

The analogue output function blocks handle the scaling of any internal REAL type IEC 61131-3 based
signal to fit a selectable 0…20 mA or 4…20 mA range for use with the outputs on the RTD/analogue
module.
General REAL type input -10000.00000...10000.00000

The recording can be triggered by any (or several) of the alternatives listed below:
• triggering on the rising or falling edge of any (or several) of the digital inputs
• triggering on overcurrent, overvoltage or undervoltage
• manual triggering via the menu or with the push-button F on the front panel (if configured)
• triggering via serial communication
• periodic triggering
The recording length depends on the number of recordings and inputs used. For example, the following
combination of recording length, number of recordings and number of inputs is available at 50 Hz:
 recordings \  inputs 1 3 10
1 1163 cyc. 412 cyc. 126 cyc.
23.2 s 8.2 s 2.5 s
5 232 cyc. 82 cyc. 25 cyc.
4.6 s 1.6 s 0.5 s
10 115 cyc. 41 cyc. 12 cyc.
2.3 s 0.8 s 0.24 s

System frequency measurement, MEFR1 (f)

Frequency 10.00…75.00 Hz
Average Freq. 10.00…75.00 Hz
Voltage U 0.0…2.0 x Un

Three-phase power and energy measurement, MEPE7 (PQE)

P3 (kW) -999999…999999 kW
Q3 (kvar) -999999…999999 kvar
Power factor DPF -1.00…1.00
Power factor PF -1.00…1.00
P3 demand (kW) -999999…999999 kW
Q3 demand (kvar) -999999…999999 kvar
Energy kWh 0…999999999 kWh
Reverse kWh 0…999999999 kWh
Energy kvarh 0…999999999 kvarh
Reverse kvarh 0…999999999 kvarh

Residual voltage measurement, MEVO1A and MEVO1B (Uo, Uo_B)

Uo 0…150000 V
Uo 0.0…120.0% Un

Three-phase voltage measurement, MEVO3A and MEVO3B (3U, 3U_B)

UL1_U12 0.00…999.99 kV
UL2_U23 0.00…999.99 kV
UL3_U31 0.00…999.99 kV
UL1_U12 0.00…2.00 x Un
UL2_U23 0.00…2.00 x Un
UL3_U31 0.00…2.00 x Un
UL1_U12 average 0.00…999.99 kV
UL2_U23 average 0.00…999.99 kV
UL3_U31 average 0.00…999.99 kV
UL1_U12 average 0.00…2.00 x Un
UL2_U23 average 0.00…2.00 x Un
UL3_U31 average 0.00…2.00 x Un

19
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 6: Protection functions

Function ANSI IEC Description
device no. symbol
AR5Func 79 O-->I Auto-reclose function (5 shots)
CUB1Cap 2) 51NC-1 dI>C Current unbalance protection for shunt capacitor banks
CUB3Cap 3) 51NC-2 3dI>C Three-phase current unbalance protection for H-bridge connected
shunt capacitor
CUB3Low 46 Iub> Phase discontinuity protection
DEF2Low 67N-1 Io>--> Directional earth-fault protection, low-set stage
DEF2High 67N-2 Io>>--> Directional earth-fault protection, high-set stage
DEF2Inst 67N-3 Io>>>--> Directional earth-fault protection, instantaneous stage
DOC6Low 1) 67-1 3I>--> Three-phase directional overcurrent protection, low-set stage
DOC6High 1) 67-2 3I>>--> Three-phase directional overcurrent protection, high-set stage
DOC6Inst 1) 67-3 3I>>>--> Three-phase directional overcurrent protection, instantaneous
stage
FLOC 4) 21FL FLOC Fault locator
Freq1St1 1) 81-1 f1 Underfrequency or overfrequency protection, stage 1
Freq1St2 1) 81-2 f2 Underfrequency or overfrequency protection, stage 2
Freq1St3 1) 81-3 f3 Underfrequency or overfrequency protection, stage 3
Freq1St4 1) 81-4 f4 Underfrequency or overfrequency protection, stage 4
Freq1St5 1) 81-5 f5 Underfrequency or overfrequency protection, stage 5
FuseFail 3) 60 FUSEF Fuse failure supervision
Inrush3 68 3I2f> Three-phase transformer inrush and motor start-up current detector
MotStart 2) 48 Is2t n< Three-phase start-up supervision for motors
NEF1Low 51N-1 Io> Non-directional earth-fault protection, low-set stage
NEF1High 51N-2 Io>> Non-directional earth-fault protection, high-set stage
NEF1Inst 51N-3 Io>>> Non-directional earth-fault protection, instantaneous stage
NOC3Low 51-1 3I> Three-phase non-directional overcurrent protection, low-set stage
NOC3High 51-2 3I>> Three-phase non-directional overcurrent protection, high-set stage
NOC3Inst 51-3 3I>>> Three-phase non-directional overcurrent protection, instantaneous
stage
OL3Cap 2) 51C 3I>3I< Three-phase overload protection for shunt capacitor banks
OV3Low 59-1 3U> Three-phase overvoltage protection, low-set stage
OV3High 59-2 3U>> Three-phase overvoltage protection, high-set stage
PSV3St1 2) 47-1 U1U2<>_1 Phase-sequence voltage protection, stage 1
PSV3St2 2) 47-2 U1U2<>_2 Phase-sequence voltage protection, stage 2
ROV1Low 59N-1 Uo> Residual overvoltage protection, low-set stage
ROV1High 59N-2 Uo>> Residual overvoltage protection, high-set stage
ROV1Inst 59N-3 Uo>>> Residual overvoltage protection, instantaneous stage
SCVCSt1 1) 25-1 SYNC1 Synchro-check / voltage-check function, stage 1
SCVCSt2 1) 25-2 SYNC2 Synchro-check / voltage-check function, stage 2
TOL3Cab 1) 49F 3Ith> Three-phase thermal overload protection for cables
TOL3Dev 2) 49M/G/T 3Ithdev> Three-phase thermal overload protection for devices
UV3Low 27-1 3U< Three-phase undervoltage protection, low-set stage
UV3High 27-2 3U<< Three-phase undervoltage protection, high-set stage
1) These functions are only supported in the feeder termi- 3) These functions are only supported in the feeder termi-
nal revisions of Release 1.5 or later. nal revisions of Release 2.5 or later.
2) These functions are only supported in the feeder termi- 4) This function is only supported in the feeder terminal
nal revisions of Release 2.0 or later. revisions of Release 3.5 or later.

20
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Settings of protection functions

Three-phase non-directional overcurrent protection, low-set stage, NOC3Low, 3I> (51-1)

Start current 0.10…5.00 x In
Operate time at DT mode 0.05…300.00 s
Time multiplier at IDMT mode 0.05…1.00
Operation mode Not in use
Definite time
Extremely inverse
Very inverse

m
Normal inverse
Long time inverse
RI-type inverse
RD-type inverse
IEEE Extremely inverse
IEEE Very inverse

.co
IEEE Short time inverse
IEEE Short time extremely inverse
IEEE Long time extremely inverse
IEEE Long time very inverse
IEEE Long time inverse
Measuring mode Peak-to-peak
Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
es
Operation accuracy ±2.5% of set value or ±0.01 x In
Start time Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
uid

Operate time accuracy at DT mode ±2% of set value or ±20 ms

Accuracy class index E at IDMT mode Class index E = 5.0 or ±20 ms

Three-phase non-directional overcurrent protection, high-set stage, NOC3High, 3I>> (51-2) and
instantaneous stage, NOC3Inst, 3I>>> (51-3)
Start current 0.10…40.00 x In
Operate time 0.05…300.00 s
Operation mode Not in use
-g

Definite time
Instantaneous

Measuring mode Peak-to-peak

Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms
all

Note! The values below apply when f/fn = 0.95...1.05

Operation accuracy 0.1...10 x In: ±2.5% of set value or ±0.01 x In
10...40 x In: ±5.0% of set value
Start time Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

21
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Three-phase directional O/C function, low-set stage, DOC6Low, 3I>(67-1)

Operation mode Not in use;
Definite time
Extremely inv.;
Very inverse
Normal inverse
Long-time inv.;
RI-type inverse
RD-type inverse
Start current 0.05…40.00 x In
Operate time 0.05…300.00 s
Time multiplier 0.05…1.00
Basic angle b 0…90
Operation direction Forward
Reverse
Earth-fault protection Disabled
Enabled
Measuring mode Phase-to-phase voltages, peak-to-peak measurement
Phase-to-phase voltages, fundamental freq. measurement
Phase-to-earth voltages, peak-to-peak measurement
Phase-to-earth voltages, fundamental freq. measurement
Drop-off time of the operate time counter 0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy 0.1...10 x In: ±2.5% of set value or ±0.01 x In
10...40 x In: ±5.0% of set value
±2.5% of measured voltage or ±0.01 x Un
±2
Start time Injected currents > 2.0 x start current:
internal time < 42 ms
total time < 50 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms
Accuracy class index E at IDMT mode Class index E = 5.0 or ±20 ms

Three-phase directional O/C function, high-set stageDOC6High, I>>(67-2), and instantaneous

stageDOC6Inst, I>>> (67-3)
Operation mode Not in use
Definite time
Instantaneous
Start current 0.05…40.00 x In
Operate time 0.05…300.00 s
Basic angle b 0…90
Operation direction Forward
Reverse
Earth-fault protection Disabled
Enabled
Non-directional operation (when the direction Disabled
cannot be determined) Enabled
Measuring mode Phase-to-phase voltages, peak-to-peak measurement
Phase-to-phase voltages, fundamental freq. measurement
Phase-to-earth voltages, peak-to-peak measurement
Phase-to-earth voltages, fundamental freq. measurement
Drop-off time of the operate time counter 0...1000 ms

22
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Note! The values below apply when f/fn = 0.95...1.05

Operation accuracy 0.1...10 x In: ±2.5% of set value or ±0.01 x In
10...40 x In: ±5.0% of set value
±2.5% of measured voltage or ±0.01 x Un
±2
Start time Injected currents > 2.0 x start current:
internal time < 42 ms
total time < 50 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

Non-directional earth-fault protection, low-set stage, NEF1Low, Io> (51N-1)

Start current 1.0…500.0% of In
Operate time at DT mode 0.05…300.00 s
Time multiplier at IDMT mode 0.05…1.00
Operation mode Not in use
Definite time
Extremely inverse
Very inverse
Normal inverse
Long time inverse
RI-type inverse
RD-type inverse
IEEE Extremely inverse
IEEE Very inverse
IEEE Short time inverse
IEEE Short time extremely inverse
IEEE Long time extremely inverse
IEEE Long time very inverse
IEEE Long time inverse
Measuring mode Peak-to-peak
Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value + 0.0005 x In
Start time Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms
Accuracy class index E at IDMT mode Class index E = 5.0 or ±20 ms

Non-directional earth-fault protection, high-set stage, NEF1High, Io>> (51N-2), and instantaneous
stage, NEF1Inst, Io>>> (51N-3)
Start current 0.10…12.00 x In
Operate time 0.05…300.00 s
Operation mode Not in use
Definite time
Instantaneous
Measuring mode Peak-to-peak
Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms

23
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Note! The values below apply when f/fn = 0.95...1.05

Operation accuracy ±2.5% of set value or + 0.01 x In
Start time Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

Directional earth-fault protection, low-set stage, DEF2Low, Io> (67N-1)

Start current 1.0…500.0% of In
Start voltage 2.0…100.0% of Un
Operate time at DT mode 0.1…300.0 s
Time multiplier at IDMT mode 0.05…1.00
Operation mode Not in use
Definite time
Extremely inverse
Very inverse
Normal inverse
Long time inverse
Operation criteria Basic angle & Uo
Basic angle
IoSin/Cos & Uo
IoSin/Cos
Non-directional Io
Non-directional Uo
Operation direction Forward
Reverse
Basic angle b -90... 60
Operation characteristic IoSin()
IoCos()
Intermittent E/F Not active
Active
Measuring mode Peak-to-peak
Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value + 0.0005 x In
±2.5% of set value or + 0.01 x Un
Phase angle ±2
Start time Injected neutral current > 2.0 x start current and
residual voltage > 2.0 x start voltage:
internal time < 72 ms
total time < 80 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms
Accuracy class index E at IDMT mode Class index E = 5.0 or ±20 ms

24
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Directional earth-fault protection, high-set stage, DEF2High, Io>> (67N-2), and instantaneous
stage, DEF2Inst, Io>>> (67N-3)
Start current 1.0…500.0% of In
Start voltage 2.0…100.0% of Un
Operate time 0.1…300.0 s
Operation mode Not in use
Definite time
Instantaneous
Operation criteria Basic angle & Uo
Basic angle
IoSin/Cos & Uo
IoSin/Cos
Non-directional Io
Non-directional Uo
Operation direction Forward
Reverse
Basic angle b -9060
Operation characteristic IoSin()
IoCos()
Intermittent E/F Not active
Active
Measuring mode Peak-to-peak
Fundamental frequency
Drop-off time of the operate time counter 0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value + 0.0005 x In
±2.5% of set value or + 0.01 x Un
Phase angle ±2
Start time Injected neutral current > 2.0 x start current
and residual voltage > 2.0 x start voltage:
internal time < 72 ms
total time < 80 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

Residual overvoltage protection, low-set stage, ROV1Low, Uo> (59N-1)

Start voltage 2.0…100.0% of Un
Operate time 0.05…300.00 s
Operation mode Not in use
Definite time
Measuring mode Peak-to-peak
Fundamental frequency
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value or ±0.01 x Un
Start time Injected voltages >2 x start voltage:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio, typically 0.95
Retardation time Total time for blocking: < 25 ms
Total time when voltage drops below start value: < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

25
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Residual overvoltage protection, high-set stage, ROV1High, Uo>> (59N-2), and instantaneous
stage, ROV1Inst, Uo>>> (59N-3)
Start voltage 2.0…100.0% of Un
Operate time 0.05…300.00 s
Operation mode Not in use
Definite time
Measuring mode Peak-to-peak
Fundamental frequency
Note! The values below apply when f/fn = 0.95...1.05

m
Operation accuracy ±2.5% of set value or ±0.01 x Un
Start time Injected voltages >2 x start voltage:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)

.co
Reset ratio, typically 0.95
Retardation time Total time for blocking: < 25 ms
Total time when voltage drops below start value: < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

Three-phase thermal overload protection for cables, TOL3Cab, 3Ith> (49F)

es
Time constant for the cable 1…999 min
Maximum load current for the cable 1.0…5000.0 A
Maximum temperature of conductor 40.0…150.0C
Reference temperature -50.0…100.0C
Trip temperature 80.0…120.0%
Prior alarm temperature 40.0…100.0%
Reclosure temperature 40.0…100.0%
Ambient temperature -50.0…100.0C
uid

Operation mode (principle of ambient Not in use

temperature compensation) No sensors; the set ambient temperature
1 sensor used
2 sensors used
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±1.0%, I = 0.1...10.0 x In
Reset ratio Trip: (Calculated temp. rise - 0.1) / Trip temperature
Start: (Calculated temp. rise - 0.1) / Prior alarm
temperature
-g
all

26
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Three-phase thermal overload protection for motors, generators and transformers, TOL3Dev,
3Ithdev> (49M/G/T)
BASIC SETTINGS
Starting current of the motor 0.10...10.00 x In
Max. starting time permitted for the motor 0.1...120.0 s
Number of starts allowed from cold state 1...3
Type of device to be protected Motor; through-ventilated, rated power < 1500 kW
Motor; through-ventilated, rated power > 1500 kW
Motor; surface cooling, rated power < 500 kW
Motor; surface cooling, rated power > 500 kW
Generator; hydro or small air-cooled turbine generators
Generator; large turbine generators
Transformer
Trip temperature 80.0…120.0%
Prior alarm temperature 40.0…100.0%
Restart inhibit (temperature limit for
successful restarting) 40.0…100.0%
Ambient temperature -50.0…100.0C
Cooling time-constant 1.0...10.0 x time constant
Heating time-constant for generator or
transformer 1...999 min
ADVANCED SETTINGS
Short time-constant for stator 0.0...999.0 min
Long time-constant for stator 0.0...999.0 min
Weighting factor of the short time-constant for
stator 0.00...1.00
Temperature rise of stator at rated current
Maximum temperature of stator 0.0...350.0 C
Short time-constant for rotor 0.0...350.0 C
Long time-constant for rotor 0.0...999.0 min
Weighting factor of the short time-constant for 0.0...999.0 min
rotor
Temperature rise of rotor at rated current 0.00...1.00
Maximum temperature of rotor
0.0...350.0 C
0.0...350.0 C
Operation mode (principle of ambient Not in use
temperature compensation) No sensors; the set ambient temperature
1 sensor used
2 sensors used
Waiting time for a successful restart (Read-
only parameter) 0...99999 s
Predicted time to the trip (Read-only
parameter) 0...99999 s
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±1.0%, I = 0.1...10.0 x In
Reset ratio Trip: (Calculated temp. rise - 0.1) / Trip temperature
Start: (Calculated temp. rise - 0.1) / Prior alarm
temperature
Restart: (Calculated temp. rise - 0.1) / Restart inhibit
temperature limit

27
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Three-phase overvoltage protection, low-set stage, OV3Low, 3U> (59-1)

Start voltage 0.10…1.60 x Un
Operate time 0.05…300.00 s
Time multiplier 0.05…1.00
Operation mode Not in use
Definite time
A curve
B curve
Measuring mode Phase-to-phase voltages; peak-to-peak measurement
Phase-to-phase voltages; fundamental freq. measurement
Phase-to-earth voltages; fundamental freq. measurement
Operation hysteresis 1.0...5.0%
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±35 ms
Start time Injected voltages = 1.1 x start voltage:
internal time < 42 ms
total time < 50 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio 0.96 (range0.95...0.99)
Retardation time < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms
Accuracy class index E at IDMT mode, ±20 ms
typically

Three-phase overvoltage protection, high-set stage, OV3High, 3U>> (59-2)

Start voltage 0.10…1.60 x Un
Operate time 0.05…300.00 s
Operation mode Not in use
Definite time
Measuring mode Phase-to-phase voltages; peak-to-peak measurement
Phase-to-phase voltages; fundamental freq. measurement
Phase-to-earth voltages; fundamental freq. measurement
Operation hysteresis 1.0...5.0%
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value
Start time Injected voltages = 1.1 x start voltage:
internal time < 42 ms
total time < 50 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio 0.96 (range 0.95...0.99)
Retardation time < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±20 ms

Three-phase undervoltage protection, low-set stage, UV3Low, 3U< (27-1)

Start voltage 0.10…1.20 x Un
Operate time 0.1…300.0 s
Time multiplier 0.1…1.0
Operation mode Not in use
Definite time
C curve
Measuring mode Phase-to-phase voltages; peak-to-peak measurement
Phase-to-phase voltages; fundamental freq. measurement
Phase-to-earth voltages; fundamental freq. measurement
Operation hysteresis 1.0...5.0%

28
 All manuals and user guides at all-guides.com
Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Note! The values below apply when f/fn = 0.95...1.05

Operation accuracy ±35 ms
Start time Injected voltages < 0.5 x start voltage:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio 1.04 (range 1.01...1.05)
Retardation time < 60 ms
Operate time accuracy at DT mode ±2.5% of set value
Accuracy class index E at IDMT mode, ±35 ms
typically

Three-phase undervoltage protection, high-set stage, UV3High, 3U<< (27-2)

Start voltage 0.10…1.20 x Un
Operate time 0.1…300.0 s
Operation mode Not in use
Definite time
Measuring mode Phase-to-phase voltages; peak-to-peak measurement
Phase-to-phase voltages; fundamental freq. measurement
Phase-to-earth voltages; fundamental freq. measurement
Operation hysteresis 1.0...5.0%
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value
Start time Injected voltages < 0.5 x start voltage:
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the trip output)
Reset ratio 1.04 (range 1.01...1.05)
Retardation time < 60 ms
Operate time accuracy at DT mode ±2.5% of set value

Phase-sequence voltage protection, PSV3St1 and PSV3St2, U1 U2< >_1,U1 U2< >_2 (47-1, 47-2)
Start value U2> 0.01…1.00 x Un
Start value U1< 0.01…1.20 x Un
Start value U1> 0.80…1.60 x Un
Operate time U2> 0.04…60.00 s
Operate time U1< 0.04…60.00 s
Operate time U1> 0.04…60.00 s
Operation mode Not in use; U1< & U2> & U1>; U1< & U2>; U2> & U1>;
U1< & U1>; U2>; U1<; U1>
Dir. selection Forward; Reverse; Input ROT_DIR

29
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Note! The values below apply when f/fn = 0.95...1.05

Operation accuracy ± 2.5% of set value or ± 0.01 x Un
Trip time U2> operation:
Injected negative-seq. voltage = 1.1 x start value:
internal time < 42 ms
total time < 50 ms
U1< operation:
Injected positive-seq. voltage = 0.50 x start value:
internal time < 32 ms
total time < 40 ms
U1> operation:
Injected positive-seq. voltage = 1.1 x start value:
internal time < 42 ms
total time < 50 ms
Reset time 70...1030 ms (depends on the minimum pulse width
set for the TRIP output)
Reset ratio, typically U2> operation: 0.96
U1< operation: 1.04
U1> operation: 0.99
Retardation time < 45 ms (for all operations)
Operate time accuracy ± 2% of set value or ± 20 ms

Underfrequency or overfrequency protection, 5 stages, Freq1St1… Freq1St5, f1 ... f5 (81-1 ... 81-5)
Operation mode Not in use
f</f> 1 timer
f</f> 2 timers
f</f> OR df/dt>
f</f> AND df/dt>
f</f> OR df/dt<
f</f> AND df/dt<
Undervoltage limit for blocking 0.30…0.90 x Un
Start value for under-/overfrequency prot. 25.00…75.00 Hz
Operate time for under-/overfrequency prot. 0.10…300.00 s
Start value for df/dt protection 0.2…10.0 Hz/s
Operate time for df/dt protection 0.12…300.00 s
Operation accuracy Under-/overfrequency (f</f>): ±10 mHz
Frequency rate of change (df/dt);
real df/dt < ±5 Hz/s: ±100 mHz/s
real df/dt < ±15 Hz/s: ±2.0% of real df/dt
Undervoltage blocking: ±1.0% of set value
Start time Total start times at fn = 50 Hz:
Frequency measurement < 100 ms
Df/dt measurement < 120 ms
Reset time 140...1000 ms (depends on the minimum pulse width set
for the trip output)
Operate time accuracy ±2% of set value or ±30 ms

30
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Start-up supervision for motors, MotStart, Is2t n< (48)

Start current (for motor) 1.0...10.0 x In
Start time (for motor) 0.3...250.0 s
Time-based restart inhibit limit 1.0...500.0 s
Countdown rate of the time counter 2.0...250.0 s/h
Stalling time permitted for rotor 2.0...120.0 s
Operation mode Not in use
I2 t
I2t & Stall

m
Start counter (Read-only parameter) 0...99999
Time to restart enable (Read-only parameter) 0...99999 min
Stall input (signal for motor stalling indication;
read-only parameter) Not active
Active
Operation accuracy f/fn = 0.95...1.05: ±2.5% of set value or ±0.01 x In

.co
Start time f/fn = 0.95...1.50:
internal time < 22 ms
total time < 30 ms
f/fn = 0.50...0.95:
internal time < 32 ms
total time < 40 ms
Reset ratio, typically 0.95
Retardation time < 50 ms
es
Three-phase overload protection for shunt capacitor banks, OL3Cap, 3I>3I< (51C)
Operate times of the overload stage Ib>
I/Ib> t [s] Standard durations [s] Standard
1.15 1799 1800 IEC 60871-1
uid

1.20 299 300 IEC 60871-1

1.30 58 60 ANSI/IEEE 37.99, IEC
60871-1
1.40 13.5 15 ANSI/IEEE 37.99
1.70 0.9 1 ANSI/IEEE 37.99
2.00 0.29 0.3 ANSI/IEEE 37.99
2.20 0.1 0.12 ANSI/IEEE 37.99
Note! The minimum operate time is 100 ms
Start current of trip stage 0.30...1.50 x In
-g

Time multiplier k for trip stage 0.05...2.0

Start current of alarm stage 0.80...1.20 x Ib
Operate time of alarm stage 0.5...6000.0 s
Start current of undercurrent stage 0.10...0.70 x Ib
Operate time of undercurrent stage 0.1...120 s
Setting of reconnection inhibit time trec 0.5...6000 s
all

Operation accuracies Note! The values below apply when f/fn=0.95...1.05

2.5% of set value or 0.01 x In
Start time Injected currents = 2.0 x start current
internal time < 32 ms
total time < 40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set
for the TRIP output)
Reset ratio Overload stages: Typ. 0.95
Undercurrent stage: Typ. 1.05
Retardation time Total retardation time when the current exceeds the
start value: < 50 ms
Operate time accuracy at definite time mode 2% of set value or 20 ms
(alarm stage Ia>, undercurrent stage I<)
Operate time accuracy at inverse time mode Depends on the frequency of the current measured:
(trip stage Ib>) 10% of theoretical value or 40 ms

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1MRS750443-MBG

Current unbalance protection for shunt capacitor banks, CUB1Cap, dI>C (51NC-1)
Operation mode Not in use; Definite time; Extremely inv.; Very inv.;
Normal inv.; Long-time inv.; RI-type inv.; RD-type inv.
Alarm mode Normal mode; Element counter
Start current of the tripping stage 1.0...100.0%dIn
Operate time of the tripping stage in DT mode 1.0...300 s
Time multiplier k for the tripping stage in 0.05...2.0
IDMT mode
Start current of the alarm stage 1.0...100.0%dIn
Operate time of the alarm stage 1.0...300 s
Disallowed number of faulty elements 1...100
Level of natural unbalance compensation 0.0...20.0%dIn
Recording of the natural unbalance phasor Do not activate; Activate
Location of capacitor fuses External; Internal
Faulty elements counter
Amount of faulty elements in branch 1 of 0...100
phase IL1
Amount of faulty elements in branch 2 of 0...100
phase IL1
Amount of faulty elements in branch 1 of 0...100
phase IL2
Amount of faulty elements in branch 2 of 0...100
phase IL2
Amount of faulty elements in branch 1 of 0...100
phase IL3
Amount of faulty elements in branch 2 of 0...100
phase IL3
Note! The values below apply when f/fn=0.95...1.05
Operation accuracies 2.5% of set value + 0.001 x dIn
Phase angle measurement: 2
Start time Injected currents = 2.0 x start current
internal time <32 ms
total time <40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the TRIP output)
Reset ratio Typ. 0.95
Retardation time < 45 ms
Operate time accuracy at definite-time mode 2% of set value or 20 ms
Operate time accuracy at inverse-time mode Class index E = 5.0 or 20 ms

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Three-phase current unbalance protection for H-bridge connected shunt capacitor banks,
CUB3Cap, 3dI>C (51NC-2)
Operation mode Not in use; Definite time; Extremely inv.; Very inv.;
Normal inv.; Long-time inv.; RI-type inv.; RD-type inv.
Start current of the tripping stage 1.0...100.0% dIn
Operate time of the tripping stage in DT mode 1.0...300 s
Time multiplier k for the tripping stage in 0.05...2.0
IDMT mode
Start current of the alarm stage 1.0...100.0% dIn
Operate time of the alarm stage 1.0...300.0 s
Comp natural dI1 0.0...20.0% dIn
Comp natural dI2 0.0...20.0% dIn
Comp natural dI3 0.0...20.0% dIn
Rec natural dI Do not activate; Rec all phasors; Rec phasor dI1, Rec
phasor dI2, Rec phasor dL3
Note! The values below apply when f/fn=0.95...1.05
Operation accuracies 2.5% of set value + 0.0005 x dIn
Phase angle measurement: 2
Start time Injected currents = 2.0 x start current
internal time <32 ms
total time <40 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for
the TRIP output)
Reset ratio, typically 0.95
Retardation time < 45 ms
Operate time accuracy at definite-time mode 2.5% of set value or 0.1% dIn
Operate time accuracy at inverse-time mode 2.5% of set value or 0.1% dIn

Auto-reclosure function, AR5Func, O  I (79)

Number of reclosures 0…5
Initiation mode Trip
Start
AR1, AR2, AR3, AR4 starting line operation No operation
mode AR shot initiated
Initiation of AR shot blocked
AR1 AR2, AR3, AR4 start delay 0…10.00 s
Dead time 0.20…300.00 s
Synchro-check Not in use; ARSYNC in use
Discriminating time td 0…30.00 s
Operation accuracy ±1% of setting value or ±30 ms

Synchro-check/voltage check function stage 1 and stage 2, SCVCSt1 & SCVCSt2, SYNC1, SYNC2
(25-1, 25-2)
Upper threshold voltage Umax 0.50…1.00 x Un
Lower threshold voltage Umin 0.10…0.80 x Un
Voltage difference U 0.02…0.60 x Un
Phase angle difference phase 5…90
Frequency difference f 0.02…5.00 Hz

Operation accuracy Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.01 x Un
±10 mHz
±2
Reset time < 50 ms
Reset ratio 0.975 x Un
Operate time accuracy ±2% of set value or ±20 ms

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Phase discontinuity protection, CUB3Low, Iub> (46)

Start unbalance 10.0…95.0%
Operate time 1.0…300.0 s
Operation mode Not in use
Definite time
Note! The values below apply when f/fn = 0.95...1.05
Operation accuracy ±2.5% of set value or ±1% unit
Start time internal time < 95 ms
total time < 100 ms
Reset time 40...1000 ms (depends on the minimum pulse width set for the trip
output)
Reset ratio, typically 0.95
Retardation time Total time for blocking: < 25 ms
Total time when current drops below start value: < 50 ms
Operate time accuracy at DT mode ±2% of set value or ±50 ms

Fuse failure supervision, FuseFail, FUSEF (60)

Ratio U2/U1> 10...50%
Ratio I2/I1< 10...50%
Operation accuracy When f/fn = 0.98...1.02
±2.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
When f/fn = 0.95...1.05
±4.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
BSOUT activation time (when the Injected negative-sequence voltage = 2.00 x Ratio U2/U1>
task interval is 10 ms) (f/fn=0.98...1.02: < 35 ms (within the same task)
Reset time 20 ms (within the same task)
Reset ratio for Ratio U2/U1>: 0.8...0.96
for Ratio I2/I1<: 1.04...1.2

Fault locator, FLOC (21FL)

The fault locator function for radial distribution systems. Short-circuit localization in all kinds of distribution
networks. Earth fault localizations in effectively earthed networks and in low reactance/low resistance
earthed networks.
Fault localization accuracy ±2.5% of the line length.

Actual fault localization accuracy depends on the fault and the

power system characteristics as described in the FLOC function
block manual, section “Result validity indicator for earth faults”.

Table 7: Power quality functions

Function ANSI IEC Description
device no. symbol
PQCU3H 1) PQ 3Inf PQ 3Inf Current waveform distortion measurement
PQVO3H 1) PQ 3Unf PQ 3Unf Voltage waveform distortion measurement
PQVO3Sd 2) PQ 3U<> PQ 3U<> Short duration voltage variations
1) These functions are only supported in the feeder termi- 2) This function is only supported in the feeder terminal
nal revisions of Release 2.0 or later. revisions of Release 3.5 or later

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Settings of power quality functions

Current waveform distortion measurement, PQCU3H, PQ 3inf (PQ 3inf)

The current waveform distortion measurement PQCU3H is used for measurement and statistical analysis
of current waveform distortion. The standards concerning voltage distortion measurement are applied to
current distortion measurement in PQCU3H. Data collection and analysis is done according to EN 50160.
Measuring principles for individual harmonics and THD are adapted from the International standard IEC
61000-4-7. The American standard IEEE Std 1159 is also partly supported. Analysis can be done for one
selected phase current or most distorted phase current can be tracked.
Measuring modes Not in use; L1; L2; L3; Worst phase
Measurement activation Triggering by: setting parameter, binary input, date & time setting
Triggering mode Single; Continuous; Periodic
Distortion factor THD; TDD
Monitored values
THD (3 sec and 10 min mean values) 0.0 ... 1000.0%
Harmonic components from 1st to
13th (3 sec mean values) 0.0 ... 1000.0% In
Harmonic components from 2nd to
13th (10 min mean values) 0.0 ... 1000.0% In
Statistics
Observation times for statistics 1 hour; 12 hours; 1 day; 2 days; 3 days; 4 days; 5 days; 6 days; 1
week
Percentile setting 90.0 ... 99.5%
Percentiles for each harmonic and
THD 0.0 ... 1000.0% In
Five fixed percentiles (1,5,50,95,99)
for one selectable harmonic or THD 0.0 ... 1000.0% In
Maximum values for each harmonic
and THD 0.0 ... 1000.0% In
Recorded data One data set for updating; One data set from the previous
observation period
Harmonic limit supervision
Limit for THD 0.0 ... 60.0%
Limits for each harmonic 0.0 ... 40.0% In
Recorded data If any limit should be exceeded, the whole harmonic set will be
recorded during the maximum THD (3 sec values)
Operation criteria
Fundamental frequency 0.9 ... 1.1 Fn
Frequency deviation  0.5 Hz (difference between max and min values within one
second)
Amplitude of the fundamental wave  1% In
Measurement accuracy
Measured harmonic Im = 1st, ... , In accordance with IEC 61000-4-7
10th
Measured harmonic Im = 11th, ... ,  1.0% In, if Im < 10% In;  10% Im, if Im  10% In
13th

Voltage waveform distortion measurement, PQVO3H, PQ 3unf (PQ 3unf)

The voltage waveform distortion measurement PQVO3H is used for measurement and statistical analysis
of voltage waveform distortion. Data collection and analysis is done according to EN 50160. Measuring
principles for individual harmonics and THD are adapted from the International standard IEC 61000-4-7.
The American standard IEEE Std 1159 is also partly supported. Analysis can be done for one selected
phase or phase-to-phase voltage or most distorted phase or phase-to-phase voltage can be tracked.
Measuring modes Not in use; L1; L2; L3; Worst phase; L1-L2; L2-L3; L3-L1; Worst
Measurement activation main
Triggering mode Triggering by: setting parameter, binary input, date & time setting
Single; Continuous; Periodic

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Monitored values
THD (3 sec and 10 min mean values) 0.0 ... 120.0%
Harmonic components from 1st to
13th (3 sec mean values) 0.0 ... 120.0% Un
Harmonic components from 2nd to
13th (10 min mean values) 0.0 ... 120.0% Un
Statistics
Observation times for statistics 1 hour; 12 hours; 1 day; 2 days; 3 days; 4 days; 5 days; 6 days; 1
week
Percentile setting 90.0 ... 99.5%
Percentiles for each harmonic and
THD 0.0 ... 120.0% Un

m
Five fixed percentiles (1,5,50,95,99)
for one selectable harmonic or THD 0.0 ... 120.0% Un
Maximum values for each harmonic
and THD 0.0 ... 120.0% Un
Recorded data One data set for updating; One data set from the previous
observation period

.co
Harmonic limit supervision
Limit for THD 0.0 ... 30.0%
Limits for each harmonic 0.0 ... 20.0% Un
Recorded data If any limit should be exceeded, the whole harmonic set will be
recorded during the maximum THD (3 sec values)
Operation criteria
Fundamental frequency 0.9 ... 1.1 Fn
Frequency deviation  0.5 Hz (difference between max and min values within one
second)
es
Amplitude of the fundamental wave  0.7 Un
Measurement accuracy
Measured harmonic Um = 1st, ... , In accordance with IEC 61000-4-7
10th
Measured harmonic Um = 11th, ... ,  0.3% Un, if Um < 3% Un;  10% Um, if Um  3% Un
13th
uid

Short duration voltage variation measurement, PQVO3Sd, PQ3U< > (PQ3U< >)
The PQVO3Sd function block is used for measuring short duration voltage variations. Power quality is
being evaluated in the voltage waveform by measuring voltage swells, sags and interruptions. Power
quality measurements carried out by the function block PQVO3Sd follow the European Standard 
EN 50160. Measuring principles are taken from the International standard IEC 61000-4-30.
Swell start voltage 100.0 … 200.0%
-g

Sag start voltage 0.0 … 100.0%

Interruption start voltage 0.0 … 100.0%
Minimum duration 8 … 60000ms
Maximum duration 8 … 60000ms
Measurement accuracy (in normal
operating conditions)
all

Duration measurement In accordance with IEC 61000-4-30 Class A

Voltage and current measurement In accordance with IEC 61000-4-30 Class B
Reset ratio, typically 0.95

Table 8: Energizing inputs

Rated frequency 50.0/60.0 Hz
Current inputs rated current 0.2 A/1 A/5 A
thermal withstand continuously 1.5 A/4 A/20 A
capability for 1 s 20 A/100 A/500 A
dynamic current withstand, half-wave value 50 A/250 A/1250 A
input impedance <750 m/<100m
<20 m
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1MRS750443-MBG

Table 8: Energizing inputs

Voltage inputs rated voltage 100 V/110 V/115 V/120 V
(parameterization)
voltage withstand, continuously 2 x Un (240 V)
burden at rated voltage <0.5 VA
Sensor inputs, max 9 AC voltage range 9.4 V RMS
DC voltage range ±13.3 V
input impedance > 4.7 M
input capacitance < 1 nF

Table 9: Auxiliary power supplies

Type PS1/240V PS2/240V External PS1/48V PS2/48V
(REF 541, (REF 545 display (REF 541, (REF 545
REF 543) only) module REF 543) only)
Input voltage, ac 110/120/220/240 V -
Input voltage, dc 110/125/220 V 24/48/60 V
Voltage variation ac 85…110%, dc 80…120% dc 80…120% of rated value
of rated value
Burden <50 W
Ripple in dc auxiliary voltage max. 12% of the dc value
Interruption time in auxiliary <40 ms, 110 V and <60 ms, 48 V and
dc voltage without resetting <100 ms, 200 V <100 ms, 60 V
Internal overtemperature +78C (+75…+83C)
indication

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1MRS750443-MBG

Table 10: Digital inputs

Power supply version PS1/240 V (High) PS1/240 V (Medium), PS1/48 V (Low),
PS2/240 V PS2/48V
Input voltage, dc 220 V 110/125/220 V 24/48/60/110/125/
220 V
Operating range, dc 155…265 V 80...265 V 18...265 V
Current drain ~2…25 mA
Power consumption/input <0.8 W
Pulse counting (specific digital inputs), 0…100 Hz
frequency range
Time synchronization (specific digital once per minute or once per second
inputs) synchronization rate

Table 11: RTD/analogue inputs

Supported RTD sensors 100 Platinum TCR 0.00385 (DIN 43760)
250 Platinum TCR 0.00385
1000 Platinum TCR 0.00385
100 Nickel TCR 0.00618 (DIN 43760)
120 Nickel TCR 0.00618
250 Nickel TCR 0.00618
1000 Nickel TCR 0.00618
10 Copper TCR 0.00427
120 Nickel TCR 0.00672 (MIL-T-24388C)
Max lead resistance 200 per lead
(three-wire
measurement)
Accuracy ±0.5% of full scale
±1.0% of full scale for 10 Copper RTD
Isolation 2 kV (inputs to outputs and inputs to protective earth)
Sampling frequency 5 Hz
Response time  Filter time + 30 ms (430 ms...5.03 s)
RTD/ Resistance max 4.2 mA RMS
sensing current 6.2 mA RMS for 10 Copper
Current input impedance 274 ±0.1%

Table 12: Signal outputs

Max system voltage 250 V ac/dc
Continuous carry 5A
Make and carry for 0.5 s 10 A
Make and carry for 3 s 8A
Breaking capacity when control circuit time-constant 1 A/0.25 A/0.15 A
L/R <40 ms, at 48/110/220 V dc

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1MRS750443-MBG

Table 13: Power outputs

Max system voltage 250 V ac/dc
Continuous carry 5A
Make and carry for 0.5 s 30 A
Make and carry for 3 s 15 A
Breaking capacity when control circuit time constant 5 A/3 A/1 A
L/R <40 ms, at 48/110/220 V dc
Minimum contact load 100 mA, 24 V ac/dc (2.4 VA)
TCS (Trip Circuit Control voltage range 20…265 V ac/dc
Supervision) Current drain through the approx. 1.5 mA (0.99…1.72 mA)
supervision circuit
Minimum voltage 20 V ac/dc (15…20 V)
(threshold) over a
contact

Table 14: Analogue outputs

Output range 0...20 mA
Accuracy ±0.5% of full scale
Max load 600 
Isolation 2 kV (output to output, output to inputs and output to
protective earth)
Response time 85 ms

Table 15: Environmental conditions

Specified service temperature range -10…+55C
Transport and storage temperature range -40…+70C
Degree of protection by enclosure Front side, flush-mounted IP 54
Rear side, connection terminals IP 20
Dry heat test according to IEC 60068-2-2
Dry cold test according to IEC 60068-2-1
Damp heat test, cyclic according to IEC 60068-2-30
r.h. = 95%, T = 20…55C
Storage temperature tests according to IEC 60068-2-48

Table 16: Standard tests

Insulation tests Dielectric test Test voltage 2 kV, 50 Hz, 1 min.
IEC 60255-5
Impulse voltage test Test voltage 5 kV, unipolar impulses,
IEC 60255-5 waveform 1.2/50 s,
source energy 0.5 J
Insulation resistance Insulation resistance > 100 M, 500 V dc
measurements
IEC 60255-5
Mechanical tests Vibration tests (sinusoidal) IEC 60255-21-1, class I
Shock and bump test IEC 60255-21-2, class I
Seismic test IEC 60255-21-3, class 2

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1MRS750443-MBG

Table 17: Electromagnetic compatibility tests

The EMC immunity test level fulfills the requirements listed below
1 MHz burst disturbance test, common mode 2.5 kV
class III, IEC 60255-22-1 differential mode 1.0 kV
Electrostatic discharge test, class for contact discharge 6 kV
III, IEC 61000-4-2 and  for air discharge 8 kV
IEC 60255-22-2
Radio frequency interference test conducted, common mode 10 V (rms), f = 150 kHz…80 MHz
IEC 61000-4-6
radiated, amplitude-modulated 10 V/m (rms),
IEC 61000-4-3 f = 80…1000 MHz
radiated, pulse-modulated 10 V/m, f = 900 MHz
ENV 50204
radiated, test with a portable f = 77.2 MHz, P = 6 W;
transmitter f = 172.25 MHz, P = 5 W
IEC 60255-22-3, method C
Fast transient disturbance test power supply 4 kV
(IEC 60255-22-4 and  I/O ports 2 kV
IEC 61000-4-4)
Surge immunity test power supply 4 kV, common mode
(IEC 61000-4-5) 2 kV, differential mode
I/O ports 2 kV, common mode
1 kV, differential mode
Power frequency (50 Hz) 100 A/m
magnetic field, IEC 61000-4-8
Voltage dips and short 30%, 10 ms
interruptions, IEC 61000-4-11 >90%, 5000 ms
Electromagnetic emission tests conducted RF emission (mains EN 55011, class A
EN 55011 and EN 50081-2 terminal)
radiated RF emission EN 55011, class A
CE approval Complies with the EMC directive 89/336/EEC and the LV directive
73/23/EEC

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1MRS750443-MBG

Table 18: Data communication

Rear interface, connector X3.1 not used, reserved for future purposes
Rear interface, connector X3.2 RS-232 connection
RER 123 fibre-optic Bus Connection Module
protocols SPA, IEC_103, DNP 3.01),
Modbus1)
RER 133 RS-485 Bus Connection Module
protocols DNP 3.0 2), Modbus 2)

m
data transfer rates DNP 3.0 and Modbus:
300 bps...19.2 kbps, selectable
SPA-ZC 302 Profibus-DPV1/SPA Gateway
protocol Profibus-DPV1 1)
SPA-ZC 400 SPA/ Ethernet Adapter
IEC 61850 1)

.co
protocol
Rear interface, connector X3.3 RS-485 connection
protocol SPA, LON
the fibre-optic interface module RER 103 is needed for galvanic
isolation
data transfer rates SPA: 4.8/9.6/19.2 kbps,
selectable
LON: 78.0 kbps/1.2 Mbps,
selectable
es
Rear interface, connector X3.4 RJ45 connection
galvanically isolated RJ45 connection for an external display panel
protocol CAN
communication cable 1MRS 120511.001 (1 m)
1MRS 120511.002 (2 m)
1MRS 120511.003 (3 m)
uid

Front panel optical connection

protocol SPA
communication cable 1MKC 9500011
SPA protocol bit rates 4.8/9.6/19.2 kbps
start bits 1
data bits 7
parity even
stop bits 1
-g

LON protocol bit rates 78.0 kbps/1.2 Mbps

IEC_103 protocol bit rates 9.6/19.2 kbps
data bits 8
parity even
stop bits 1
all

DNP 3.0 bit rates 0.3/0.6/1.2/2.4/4.8/9.6/19.2 kbps

data bits 8
stop bits 1, 2
parity none, odd, even
Modbus bit rates 0.3/0.6/1.2/2.4/4.8/9.6/19.2 kbps
data bits 5, 6, 7, 8
stop bits 1, 2
parity none, odd, even
1) These functions are only supported in the feeder terminal
revisions of Release 3.5 or later.
2) These functions are only supported in the feeder terminal
revisions of Release 3.0 or later.

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 19: General

Toolboxes CAP 501
CAP 505
LNT 505
Event recording all events are recorded in higher level syntax:
reason, time, date 
the last 100 events are recorded
Data recording records operate values
Protection functions see Technical Descriptions of Functions, CD-ROM
Control functions (1MRS 750889-MCD)
Condition monitoring functions
Measurement functions
Power quality functions
Self-supervision RAMs
ROMs
EEPROMs
all analogue reference voltages
automatic test sequences for I/Os and HMI modules
output contact condition monitoring (all contacts)
Mechanical dimensions Width: 223.7 mm (1/2 of a 19” rack)
Height, frame: 265.9 mm (6U)
Height, box: 249.8 mm
Depth: 235 mm
External display module Width: 223.7 mm
Height: 265.9 mm
Depth: 74 mm
Weight of the unit ~8 kg

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Ordering The following is to be specified when order- nal type as well as the hardware and the soft-
ing REF 54_ terminals: order number, display ware as described below.
language combination and quantity of feeder
terminals. The order number is labelled on the marking
strip on the front panel of the feeder terminal
Each REF 54_ feeder terminal has a specific delivered, e.g. Order No:
order number that identifies the feeder termi- REF543KC127AAAA.

REF54_KC127AAAA
A = fixed display, B = external display module
A = without sensor, B = with sensor
Reserved for future use
Auxiliary voltage range of a power supply module and
voltage range of digital inputs
A: power supply: PS1/240 V (Medium) or PS2/240 V
Ur = 110/120/220/240 V ac;
110/125/220 V dc
digital inputs: Ur = 110/125/220 V dc
threshold voltage: Ut = 80 V dc
B: power supply: PS1/240 V (High) or PS2/240 V
Ur = 110/120/220/240 V ac;
110/125/220 V dc
digital inputs: Ur = 220 V dc
threshold voltage: Ut = 155 V dc
C: power supply: PS1/48 V (Low) or PS2/48 V
Ur = 24/48/60 V dc
digital inputs: Ur = 24/48/60/110/125/220 V dc
threshold voltage: Ut = 18 V dc
Hardware number: 115, 118, 127, 129, 133
Functionality level: C = Control, B = Basic, M = Multi
Software revision: A, B, C, D, E, F, G, H, K
Feeder terminal type: REF 541, REF 543, REF 545
A050601
The functionality level (C) determines the blocks included in each selection, please see
extent of the selection of function blocks the table Functionality levels, protection
available for the feeder terminal. For more functions on the next page or consult your
detailed information on the separate function relay supplier.

Functionality Selection of function blocks

level
C (Control) All control, condition monitoring and measurement functions
B (Basic) All control, condition monitoring and measurement functions, 
basic protection functions
M (Multi) All control, condition monitoring, measurement and 
protection functions

In addition, optional functions, such as fault The display language combination (see table
locator, power quality, capacitor bank protec- below) is identified by a three-digit suffix in
tion and power factor control functions are the software number labelled on the front
available. panel of the feeder terminal, e.g. Software
1MRS110028-0__.

Language combinations
Suffix Language combination
001 English-German
002 English-Swedish
003 English-Finnish
007 English-Portuguese
008 English-Polish
009 English-Russian
010 English-Spanish
012 English-Czech

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

The REF 541, REF 543 and REF 545 feeder Terminals can optionally be ordered with an
terminals differ from each other as to the ANSI front panel.
number of digital inputs and outputs as fol-
lows.

Number of inputs/outputs
Number of inputs/outputs REF 541 REF 543 REF 545
Digital inputs 15 25 34
Trip circuit supervision inputs 2 2 2
Power outputs (NO single-pole) 0 2 3
Power outputs (NO double-pole) 5 9 11
Signal outputs (NO) 2 2 4
Signal outputs (NO/NC) 5 5 8
Self-supervision outputs 1 1 1

The functionality level determines the extent information on the separate function blocks
of the selection of function blocks available included in each selection, please consult
for the feeder terminal. For more detailed your relay supplier.

Functionality levels, protection functions

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/5 REF541/3/5 REF541/3/5

Code Symbol CONTROL BASIC MULTI
SHORT CIRCUITS
51-1 3I > Three-phase non-directional NOC3Low X X
overcurrent, low-set stage
51-2 3I >> Three-phase non-dir. NOC3High X X
overcurrent, high-set stage /
blockable overcurrent
51-3 3I >>> Three-phase non-dir. NOC3Inst X X
overcurrent, inst. stage /
blockable overcurrent
67-1 3I > -> Three-phase directional o/c, DOC6Low X X
low-set stage
67-2 3I >> -> Three-phase directional o/c, DOC6High X X
high-set stage / blockable
overcurrent
67-3 3I >>> -> Three-phase directional o/c, DOC6Inst X X
high-set stage / blockable
overcurrent
EARTH-FAULTS
51N-1 Io > Non-directional earth-fault, NEF1Low X X
low-set stage
51N-2 Io >> Non-directional earth-fault, NEF1High X X
high-set stage
50N-3 Io >>> Non-directional earth-fault, NEF1Inst X X
instantaneous stage
67N-1 Io > -> Directional earth-fault, DEF2Low X X
low-set stage
67N-2 Io >> -> Directional earth-fault, DEF2High X X
high-set stage
67N-3 Io >>> -> Directional earth-fault, DEF2Inst X X
instantaneous stage
59N-1 Uo > Residual overvoltage, ROV1Low X X
low-set stage
59N-2 Uo >> Residual overvoltage, ROV1High X X
high-set stage

44
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Functionality levels, protection functions

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/5 REF541/3/5 REF541/3/5

Code Symbol CONTROL BASIC MULTI
59N-3 Uo >>> Residual overvoltage, ROV1Inst X X
instantaneous stage
OVERLOAD
49F 3Ith> Three-phase thermal TOL3Cab X X
overload (feeders & cables)
OVER / UNDERVOLTAGE
59-1 3U > Three-phase overvoltage, OV3Low X
low-set stage
59-2 3U >> Three-phase overvoltage, OV3High X
high-set stage
27-1 3U < Three-phase undervoltage, UV3Low X
low-set stage
27-2 3U << Three-phase undervoltage, UV3High X
high-set stage

45
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Functionality levels, protection functions

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/5 REF541/3/5 REF541/3/5

Code Symbol CONTROL BASIC MULTI
LOAD SHEDDING AND
RESTORATION
81-1 f1 Underfrequency or Freq1St1 X
overfrequency inc. rate of
change, stage 1
81-2 f2 Underfrequency or Freq1St2 X

m
overfrequency incl. rate of
change, stage 2
81-3 f3t Underfrequency or Freq1St3 X
overfrequency incl. rate of
change, stage 3
81-4 f4 Underfrequency or Freq1St4 X

.co
overfrequency incl. rate of
change, stage 4
81-5 f5 Underfrequency or Freq1St5 X
overfrequency incl. rate of
change, stage 5
ADDITIONAL FUNCTIONS
79 OI Auto-reclosure AR5Func X X X
25-1 SYNC1 Synchro-check/voltage SCVCSt1 X X X
es
check, stage 1
25-2 SYNC2 Synchro-check/voltage SCVCSt2 X X X
check, stage 2
68 3I2f > Three-phase inrush detector Inrush3 X X
60 FUSEF Fuse failure supervision FuseFail X X X
46 Iub> Phase discontinuity CUB3Low X X
62BF CBFP Circuit breaker failure - X X X
uid

49M/G/T 3Ithdev> Three-phase thermal TOL3Dev X

overload protection for
devices
48 Is2t n< Start-up supervision for MotStart X
motors
47-1 U1U2<>_ Three-phase phase- PSV3St1 X
1 sequency voltage protection,
stage 1
-g

47-2 U1U2<>_ Three-phase phase- PSV3St2 X

2 sequency voltage protection,
stage 2

Functionality levels, other functions

all

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/ REF541/3/ REF541/3/

Code Symbol 5 5 BASIC 5 MULTI
CONTROL
MEASUREMENT
FUNCTIONS
CURRENT
3I 3I Three-phase current MECU3A X X X
3I_B 3I_B Three-phase current, B MECU3B X X X
stage
Io Io Neutral current MECU1A X X X
Io_B Io_B Neutral current, B stage MECU1B X X X
VOLTAGE
3U 3U Three-phase voltage MEVO3A X X X
46
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Functionality levels, other functions

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/ REF541/3/ REF541/3/

Code Symbol 5 5 BASIC 5 MULTI
CONTROL
3U_B 3U_B Three-phase voltage, B MEVO3B X X X
stage
Uo Uo Residual voltage MEVO1A X X X
Uo_B Uo_B Residual voltage, B stage MEVO1B X X X
ENERGY / POWER
PQE PQE Three-phase power and MEPE7 X X X
energy
(incl. cos )
FREQUENCY
f f System frequency MEFR1 X X X
RECORDING
DREC DREC Transient disturbance MEDREC16 X X X
recorder
RTD -MODULE
AI1...AI8 AI1..AI8 Measurement of MEAI1…8 X X X
RTD/analogue inputs,
general measurement
AO1... AO1... Measurement of analogue MEAO1…4 X X X
AO4 AO4 outputs (Note! Only in
products with an
RTD/analogue module)
CONDITION MONITORING FUNCTION
CIRCUIT BREAKER
CB wear1 CB wear1 CB electric wear 1 CMBWEAR1 X X X
CB wear2 CB wear2 CB electric wear 2 CMBWEAR2 X X X
TIME1 TIME1 Operate Time Counter 1 CMTIME1 X X X
(e.g. motors)
TIME2 TIME2 Operate Time Counter 2 CMTIME2 X X X
(e.g. motors)
CMGAS1 GAS1 Gas pressure supervision CMGAS1 X X X
CMGAS3 GAS3 Gas pressure supervision CMGAS3 X X X
for three poles
CMSPRC1 SPRC1 Spring charging control 1 CMSPRC1 X X X
CMTRAV1 TRAV1 Breaker travel time 1 CMTRAV1 X X X
CMSCHED SCHED Scheduled maintenance CMSCHED X X X
TRIP CIRCUIT
TCS1 TCS1 Trip Circuit Supervision 1 CMTCS1 X X X
TCS2 TCS2 Trip Circuit Supervision 2 CMTCS2 X X X
MEASURING CIRCUIT
MCS 3I MCS 3I Supervision of the CMCU3 X X X
energizing current input
circuit
MCS 3U MCS 3U Supervision of the CMVO3 X X X
energizing voltage input
circuit
CONTROL FUNCTION
CIRCUIT BREAKERS,
DISCONNECTORS / EARTHING SWITCH
COCB1 I<->O  Circuit breaker 1, 2 COCB1...2 X X X
COCB2 CB1 (2 state inputs / 2 control
CB2 outputs)
CODC1…5 I<->O Disconnector 1….5 CODC1…5 X X X
DC1... (2 state inputs / 2 control
DC5 outputs)
47
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Functionality levels, other functions

FUNCTIONALITY LEVELS

ANSI IEC Function Code REF541/3/ REF541/3/ REF541/3/

Code Symbol 5 5 BASIC 5 MULTI
CONTROL
CO3DC1 I<->O Three state disconnector 1, CO3DC1...2 X X X
CO3DC2 3DC1, 2
3DC2 (3 state inputs / 4 control
outputs)
COIND1… I<->O Object indication 1…8 COIND1…8 X X X
8 IND1... (2 state inputs)
IND8
MMIDATA MMIDATA MIMIC dynamic data point MMIDATA X X X
1…5 1…5 1…5 on HMI (single line 1…5
diagram)
MMIALAR MMIALAR Alarm 1…8 on HMI (alarm MMIALAR X X X
1…8 1…8 view) 1…8
COSW1...4 SW1...4 On/off switch 1…4 on HMI COSW1…4 X X X
(single-line diagram)
COCBDIR CBDIR Direct open for CBs via HMI COCBDIR X X X
COLOCAT I<->O Logic control position COLOCAT X X X
POS selector
ADDITIONAL FUNCTIONS
Interlocking - X X X
Command control - X X X
STANDARD FUNCTIONS
Operation indication, relay INDRESET X X X
and register reset
Activation of HMI backlight MMIWAKE X X X
Switchgroups SWGRP X X X
SWGRP1...SWGRP20 1....20
PLC logics (AND, OR, - X X X
timers etc.) acc. to IEC
61131-3
DATA COMMUNICATION
Event to be defined by the EVENT230 X X X
customer, E0...E63
SPA bus - X X X
LON bus - X X X
IEC_103 - X X X
GENERAL FUNCTIONS
Main / secondary setting X X X
Remote setting X X X
Self-supervision X X X
Annunciating, event X X X
generating and value
recording
Measurement, parameter X X X
and switching device status
display
Remote-end binary signal X X X
transfer
Binary signal interbay X X X
transfer

48
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Optional functionality
Function Code Ordering number

ANSI IEC Function Order Code

device no. Symbol
CAPACITOR BANK PROTECTION
Three-phase overload protection 51C 3I>3I< OL3Cap 1MRS100116
for shunt capacitor banks
Current unbalance protection for 51NC-1 dI>C CUB1Cap 1MRS100117
shunt capacitor banks
Three-phase current unbalance 51NC-2 3dI>C CUB3Cap 1MRS100052
protection for H-bridge connected
shunt capacitor banks
CAPACITOR BANK CONTROL
Power factor controller 55 COPFC COPFC 1MRS100143
POWER QUALITY
Current waveform distortion PQ 3Inf PQ 3Inf PQCU3H 1MRS100512
measurement
Voltage waveform distortion PQ 3Unf PQ 3Unf PQVO3H 1MRS100513
measurement
Short duration voltage variations PQ 3U<> PQ 3U<> PQVO3Sd 1MRS100514
FAULT LOCATOR
Fault locator 21FL FLOC FLOC 1MRS100058
ANSI HMI
ANSI display model 1MRS121026

49
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Overview of REF hardware configurations

Hardware modules of REF 541 Order number

REF541K_115CAAA

REF541K_115CABA

REF541K_118CAAA

REF541K_118CABA
REF541K_115AAAA
REF541K_115BAAA

REF541K_115AABA
REF541K_115BABA

REF541K_115AAAB
REF541K_115BAAB
REF541K_115AABB
REF541K_115BABB
REF541K_118AAAA
REF541K_118BAAA

REF541K_118AABA
REF541K_118BABA

REF541K_118AAAB
REF541K_118BAAB
REF541K_118AABB
REF541K_118BABB
Analogue interface
Sensor channels (current or voltage) 9 9 9 9 9 9 9 9 9 9
Current transformer 1/5 A 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
Current transformer 0.2/1 A 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Voltage transformer 100 V 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
Main processor boards
CPU module 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Power supply boards
PS1: 80...265 Vdc/ac (High) 1 1 1 1 1 1 1 1
PS1: 80...265 Vdc/ac (Medium) 1 1 1 1 1 1 1 1
PS1: 18...80 Vdc (Low) 1 1 1 1
PS2: 80...265 Vdc/ac
PS2: 18...80 Vdc
Digital I/O boards
BIO1: threshold voltage 155 Vdc 1 1 1 1 1 1 1 1
BIO1: threshold voltage 80 Vdc 1 1 1 1 1 1 1 1
BIO1: threshold voltage 18 Vdc 1 1 1 1
BIO2: threshold voltage 155 Vdc
BIO2: threshold voltage 80 Vdc
BIO2: threshold voltage 18 Vdc
Analogue I/O board
RTD/analogue module 1 1 1 1 1 1 1 1 1 1
Display boards
Graphic HMIHMI display, fixed 1 1 1 1 1 1 1 1 1 1 1 1
Graphic HMI display, external 1 1 1 1 1 1 1 1
Mechanical design
1/2 enclosure 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Digital inputs 15 15
Power outputs, single-pole 0 0
Power outputs, double-pole 5 5
Signal outputs (NO) 2 2
Signal outputs (NO/NC) 5 5
Supervised trip circuits 2 2
IRF outputs 1 1
RTD/analogue inputs 0 8
Analogue outputs 0 4

50
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Hardware modules of REF 543 Order number

REF543K_127CAAA

REF543K_127CABA

REF543K_129CAAA

REF543K_129CABA
REF543K_127AAAA
REF543K_127BAAA

REF543K_127AABA
REF543K_127BABA

REF543K_127AAAB
REF543K_127BAAB
REF543K_127AABB
REF543K_127BABB
REF543K_129AAAA
REF543K_129BAAA

REF543K_129AABA
REF543K_129BABA

REF543K_129AAAB
REF543K_129BAAB
REF543K_129AABB
REF543K_129BABB
Analogue interface
Sensor channels (current or voltage) 9 9 9 9 9 9 9 9 9 9

m
Current transformer 1/5 A 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
Current transformer 0.2/1 A 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Voltage transformer 100 V 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4
Main processor boards
CPU module 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

.co
Power supply boards
PS1: 80...246 Vdc/ac (High) 1 1 1 1 1 1 1 1
PS1: 80...265 Vdc/ac (Medium) 1 1 1 1 1 1 1 1
PS1: 18...80 Vdc (Low) 1 1 1 1
PS2: 80...265 Vdc/ac
PS2: 18...80 Vdc
Digital I/O boards
BIO1: threshold voltage 155 Vdc 1 1 1 1 1 1 1 1
es
BIO1: threshold voltage 80 Vdc 1 1 1 1 1 1 1 1
BIO1: threshold voltage 18 Vdc 1 1 1 1
BIO2: threshold voltage 155 Vdc 1 1 1 1 1 1 1 1
BIO2: threshold voltage 80 Vdc 1 1 1 1 1 1 1 1
BIO2: threshold voltage 18 Vdc 1 1 1 1
Analogue I/O board
uid

RTD/analogue module 1 1 1 1 1 1 1 1 1 1
Display boards
Graphic HMI display, fixed 1 1 1 1 1 1 1 1 1 1 1
Graphic HMI display, external 1 1 1 1 1 1 1 1
Mechanical design
1/2 enclosure 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Digital inputs 25 25
Power outputs, single-pole 2 2
-g

Power outputs, double-pole 9 9

Signal outputs (NO) 2 2
Signal outputs (NO/NC) 5 5
Supervised trip circuits 2 2
IRF outputs 1 1
all

RTD/analogue inputs 0 8
Analogue outputs 0 4

51
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Hardware modules of REF 545 Order number

REF545K_133CAAA

REF545K_133CABA
REF545K_133AAAA
REF545K_133BAAA

REF545K_133AABA
REF545K_133BABA

REF545K_133AAAB
REF545K_133BAAB
REF545K_133AABB
REF545K_133BABB
Analogue interface
Sensor channels (current or voltage) 9 9 9 9 9
Current transformer 1/5 A 4 4 4 4 4 4 4 4 4 4
Current transformer 0.2/1 A 1 1 1 1 1 1 1 1 1 1
Voltage transformer 100 V 4 4 4 4 4 4 4 4 4 4
Main processor boards
CPU module 1 1 1 1 1 1 1 1 1 1
Power supply boards
PS1: 80...265 Vdc/ac (High)
PS1: 80...265 Vdc/ac (Medium)
PS1: 18...80 Vdc (Low)
PS2: 80...265 Vdc/ac 1 1 1 1 1 1 1 1
PS2: 18...80 Vdc 1 1
Digital I/O boards
BIO1: threshold voltage 155 Vdc 2 2 2 2
BIO1: threshold voltage 80 Vdc 2 2 2 2
BIO1: threshold voltage 18 Vdc 2 2
BIO2: threshold voltage 155 Vdc 1 1 1 1
BIO2: threshold voltage 80 Vdc 1 1 1 1
BIO2: threshold voltage 18 Vdc 1 1
Analogue I/O board
RTD/analogue module
Display boards
Graphic HMI display, fixed 1 1 1 1 1 1
Graphic HMI display, external 1 1 1 1
Mechanical design
1/2 enclosure 1 1 1 1 1 1 1 1 1 1
Digital inputs 34
Power outputs, single-pole 3
Power outputs, double-pole 11
Signal outputs (NO) 4
Signal outputs (NO/NC) 8
Supervised trip circuits 2
IRF outputs 1
RTD/analogue inputs 0
Analogue outputs 0

Hardware versions of REF 541, Software configuration

REF 543 and REF 545 Each REF 54_ feeder terminal allows various
For the number of digital inputs and outputs software configurations based on separate
of REF 54_ feeder terminals, refer to the functions. Functions included in the selected
tables above. The number of matching trans- functionality level can be activated within the
formers, sensor inputs and analogue inputs scope of the I/O connections and considering
and outputs, and the auxiliary voltage range the total CPU load of the functions.
vary between the different hardware versions
of REF54_. Each hardware version of REF
541 and REF 543 can be supplied with an
RTD/analogue module.
52
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Parts and assembly forms a whole for which no separate spare

descriptions parts can be supplied. In the event of mal-
To achieve the best possible operation accu- function, please consult your feeder terminal
racy, all parts of a REF 54_ product have supplier.
been calibrated together. Thus, each product

53
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Application
examples

000
3I > 50/51 MCS

I0 > 50N/51N TCS

MF

CBFP * /62 CBCM 0 I

R
REF 54_

U 90V
U

R 000
q SPAU 341

q p>

3 DI > 87T R 000

CBFP * /62

SPAD 346C

000
3I > 50/51 MCS 3I >
&
51B TCS
REA 101
3U > 59 CBCM 0 I

CBFP * /62

3I~harm R

3U~harm
P 3I
MF

Q 3U

E
REF 54_
M M
EXINFDR1

Fig. 7 Protection, control, measurement and supervision functions of a utility infeeder, implemented with
REF 54_ feeder terminals, an REA arc monitoring system and SPACOM differential relay and volt-
age regulator (main single-line diagram presentation). The neutral point of the MV network sup-
plied by the infeeder is isolated.

54
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000
3I > 50/51 MCS

I0> 50N/51N TCS

MF
CBFP * /62 CBCM 0 I

R
REF 54_

U 90V
U

R 000
SPAU 341

3D I > 87T R 000

q
q p> CBFP * /62

SPAD 346C

000
3I > 50/51 MCS 3I >
&
51B TCS

U0> 59N CBCM 0 I REA 101

3U > 59 R

CBFP * /62
P
3I~harm
3I
MF
Q
3U~harm
3U
U0

E
I0
M M
REF 54_
EXINFDR3

Fig. 8 Protection, control, measurement and supervision functions of a utility infeeder, implemented with
REF 54_ feeder terminals, an REA arc monitoring system and SPACOM differential relay and volt-
age regulator (main single-line diagram presentation). The neutral point of the MV network sup-
plied by the infeeder is earthed via the Petersen coil.

55
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

M M

m
000
3I > 50/51 MCS
MF

I0> 67N TCS

.co
I0-0> 51N CBCM 0 I

3I2f > 68

DI> 46 R
es
f< 81U
P 3I

0 I 79
I0 3U
CBFP * /62
uid

E
REF 54_
EXFDR1
-g

Fig. 9 An REF 54_ feeder terminal used for the protection, control, measurement and supervision func-
tions of a utility feeder (main single-line diagram presentation). The neutral point of the supplying
network is isolated. The scheme is also fully applicable in high-impedance earthed networks,
where the neutral point is earthed via a high resistance or a Petersen coil.
all

56
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000 000
3U > 59 MCS 3U > 59 MCS

3U < 27 TCS 3U < 27 TCS

U0> 59N U0> 59N

f< 81U R f< 81U R

U0 3U U0 3U

f f
REF 54_ REF 54_
EXMEAS1

Fig. 10 REF 54_ feeder terminals used for the protection, control, measurement and supervision functions
of a utility/industrial measurement cubicle (main single-line diagram presentation). The neutral
point of the supplying network is isolated. The scheme is also fully applicable in high-impedance
earthed networks, where the neutral point is earthed via a high resistance or a Petersen coil.

57
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000
3I > 50/51 MCS

I0> 50N/51N TCS

MF U0 > 59N CBCM 0 I

CBFP * /62

R
REF 54_

U 90V
U

R 000
SPAU 341

3D I > 87T R 000

q
CBFP * /62
q p>

SPAD 346C

000
3I > 50/51 MCS 3I >
&
51B TCS

3I> 67 CBCM 0 I REA 101

I0> 50N/51N R

SYNC 25

3U > 59 P 3I

CBFP * /62
Q 3U
MF MF
3I~harm

3U~harm
I0 E

REF 54_
EXINFDR4

Fig. 11 Protection, control, measurement and supervision functions of a utility/industrial infeeder, imple-
mented with REF 54_ feeder terminals, an REA arc monitoring system and SPACOM differential
relay and voltage regulator (main single-line diagram presentation). The neutral point of the MV
network supplied by the infeeder is earthed via a high resistance.

58
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

MF

000
3I> 67 MCS

I0> 67N TCS

3 49F CBCM 0 I

SYNC 25

f< 81U R

3U > 59
P 3I

3U < 27
Q 3U
CBFP * /62

pf f

E
REF 54_
EXFDR3

3I >
&

REA 101

Fig. 12 An REF 54_ feeder terminal and an REA arc monitoring system (main single-line diagram presen-
tation) used for the protection, control, measurement and supervision functions of a utility/industrial
ring/meshed network cable feeder. The earthing of the supplying network can be of low or high
impedance type.

59
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000
3I > 50/51 MCS
MF

I0> 50N/51N TCS

3I2f> 68 CBCM 0 I

DI> 46

CBFP * /62 R

P 3I

E 3U
REF 54_
EXFDR4

Fig. 13 An REF 54_ feeder terminal used for the protection, control, measurement and supervision func-
tions of a utility/light industrial cable feeder (main single line diagram presentation). The earthing of
the supplying network can be of low or high impedance type.

60
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000
3I > 50/51 MCS

MF
I0> 50N/51N TCS

I02f> 68 CBCM 0 I

CBFP * /62

m
R
REF 54_

.co
U 90V
U

q R 000
SPAU 341
q p>

3D I > 87T R 000

es
DI0> 87N

DI0> 87N

CBFP * /62

SPAD 346C
uid

000
3I> 67 MCS 3I >
&
I0 > 50N/51N TCS

REA 101
SEF 51N CBCM 0 I
-g

3U > 59

3U < 27 R

f< 81U
P 3I
all

MF
CBFP * /62
pf 3U
3I~harm

3U~harm f E
REF 54_
EXINFDR2

Fig. 14 Protection, control, measurement and supervision functions of a utility infeeder, implemented with
REF 54_ feeder terminals, an REA arc monitoring system and SPACOM differential relay and volt-
age regulator (main single-line diagram presentation). The neutral point of the MV network sup-
plied by the infeeder is earthed via a low resistance. The scheme is also fully applicable to other
types of low-impedance earthed networks, where the neutral point is earthed effectively or via a
low reactance.

61
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

000
3I > 50/51 MCS
MF

I0> 50N/51N TCS

SEF 51N CBCM 0 I

3I2f> 68

DI> 46 R

f< 81U
P 3I

0 I 79

E 3U
CBFP * /62

REF 54_
EXFDR2

Fig. 15 An REF 54_ feeder terminal used for the protection, control, measurement and supervision func-
tions of a utility feeder (main single-line diagram presentation). The neutral point of the supplying
network is earthed via a low resistance. The scheme is also fully applicable to other types of low-
impedance earthed networks, where the neutral point is earthed effectively or via a low reactance.

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

3U> 59 MCS

3U< 27 TCS

U0 3U

f
REF 54_

3I> 50/51 MCS

I0 > 51N TCS

3I>3I< 51C,37C, CBCM

68C

DI> 51NC

CBFP 62BF

DI 3I

I0

asynmot1REFa
REF 54_

Fig. 16 REF 54_ used for the protection of a double Y connected capacitor bank

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

3U> 59 MCS

3U< 27 TCS

U1< 27

U2 > 47

U1> 59

U0 3U

f
REF 54_

3I> 50/51 MCS

I0 > 51N TCS

DI > 46 CBCM
2
Is t, n< 48,14,66

3 49

CBFP 62BF
P 3I

M Q U

pf f
asynmot1REFb

E
REF 54_

Fig. 17 REF 54_ used for the protection of a motor with direct-on-line starting

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

3I > 50/51 = multiple-stage three-phase overcurrent protection, low-set, high-set and instantaneous
stage available

3I> 67 = multiple-stage three-phase directional overcurrent protection, low-set, high-set and

instantaneous stage available

I0> 67N = multiple-stage directional earth-fault protection, low-set, high-set and instantaneous
stage available

I0-0> 51N = instantaneous stage for earth-fault protection, to operate in the event of a double earth
fault in isolated or impedance earthed networks

I0> 50N/51N = multiple-stage earth-fault protection, low-set, high-set and instantaneous stage
available

SEF 51N = low-set stage for sensitive earth-fault protection, to operate in the event of a high
resistive earth fault in effectively or low-impedance earthed networks

3I > 50/51 = multiple-stage three-phase overcurrent protection, one stage dedicated for blockable
busbar overcurrent protection
51B

3U > 59 = three-phase overvoltage protection, low-set and high-set stage available

3U < 27 = three-phase undervoltage protection, low-set and high-set stage available

U0> 59N = multiple-stage residual overvoltage protection, low-set, high-set and instantaneous
stage available

3I2f > 68 = inrush detection based on the 2nd harmonic content of phase currents, applied for
preventing possible unnecessary operation of overcurrent or earth-fault protection
during transformer switching-in or to start cold load pick-up logic
DI> 46 = phase discontinuity protection

f< 81U = underfrequency protection/load shedding scheme

3 49F = thermal overload protection for feeders

0 I 79 = multiple-shot auto-recloser

SYNC 25 = circuit breaker synchro-check/direction of energizing check function

3D I > 87T = differential protection for transformers

DI0> 87N = restricted earth-fault protection, low- or high-impedance type

I02f> 68 = inrush detection based on the 2nd harmonic content of neutral current, applied to
prevent possible unnecessary operation of the earth-fault protection during transformer
switching-in
CBFP * /62 = circuit-breaker failure protection
SYMNOT1

Fig. 18 Symbol notations, part I

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Is2 t , n< 48, 14, 16 = three-phase start-up supervision for motors

3 49 = three-phase thermal overload protection for devices

U ,<U ,>U > 27, 47, 59 = phase-sequence voltage protection, stages 1 and 2 available
1 2 1

DI> 51NC = current unbalance protection for shunt capacitor banks

m
51C,37C,
3I>, 3I< 68C = three-phase overload protection for shunt capacitor banks

3I > = arc protection

&

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MCS = measuring circuit supervision

TCS = trip circuit supervision

CBCM = circuit-breaker condition monitoring

U 90V
= automatic voltage regulation

= manual voltage regulation

es
U

P = active power measurement, indication and supervision

= reactive power measurement, indication and supervision

Q
uid

3I
= 3-phase current measurement, indication and supervision

= 3-phase voltage or phase-to-phase voltage measurement, indication

3U and supervision

= frequency measurement, indication and supervision

f
-g

= power factor measurement, indication and supervision

pf

I0 = residual current measurement, indication and supervision

all

U0 = residual voltage measurement, indication and supervision

SYMNOT2

Fig. 19 Symbol notations, part II

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

= energy counter, forward or reverse active / reactive energy

E

3I~harm = current waveform distortion measurement

3U~harm = voltage waveform distortion measurement

R = annunciating, event generating and value recording functions

= disturbance recorder

000 = digital value indication

000
= MMI/MIMIC display

0 I = local and remote control interface

= bay-oriented interlocking logic

SYMNOT3

Fig. 20 Symbol notations, part III

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Application selection tables for REF 541, REF 543 and REF 545
functions
.
Table 20: Protection functions
Function ANSI IEC symbol Description
device no.
AR5Func 79 O-->I Auto-reclose function (5 shots)
CUB1Cap 2) 51NC-1 dI>C Current unbalance protection for shunt capacitor banks
CUB3Cap 3) 51NC-2 3dI>C Three-phase current unbalance protection for H-bridge
connected shunt capacitor
CUB3Low 46 Iub> Phase discontinuity protection
DEF2Low 67N-1 Io>--> Directional earth-fault protection, low-set stage
DEF2High 67N-2 Io>>--> Directional earth-fault protection, high-set stage
DEF2Inst 67N-3 Io>>>--> Directional earth-fault protection, instantaneous stage
DOC6Low 1) 67-1 3I>--> Three-phase directional overcurrent protection, low-set stage
DOC6High 1) 67-2 3I>>--> Three-phase directional overcurrent protection, high-set stage
DOC6Inst 1) 67-3 3I>>>--> Three-phase directional overcurrent protection, instantaneous
stage
FLOC 4) 21FL FLOC Fault locator
Freq1St1 1) 81-1 f1 Underfrequency or overfrequency protection, stage 1
Freq1St2 1) 81-2 f2 Underfrequency or overfrequency protection, stage 2
Freq1St3 1) 81-3 f3 Underfrequency or overfrequency protection, stage 3
Freq1St4 1) 81-4 f4 Underfrequency or overfrequency protection, stage 4
Freq1St5 1) 81-5 f5 Underfrequency or overfrequency protection, stage 5
FuseFail 3) 60 FUSEF Fuse failure supervision
Inrush3 68 3I2f> Three-phase transformer inrush and motor start-up current
detector
MotStart 2) 48 Is2t n< Three-phase start-up supervision for motors
NEF1Low 51N-1 Io> Non-directional earth-fault protection, low-set stage
NEF1High 51N-2 Io>> Non-directional earth-fault protection, high-set stage
NEF1Inst 51N-3 Io>>> Non-directional earth-fault protection, instantaneous stage
NOC3Low 51-1 3I> Three-phase non-directional overcurrent protection, low-set
stage
NOC3High 51-2 I>> Three-phase non-directional overcurrent protection, high-set
stage
NOC3Inst 51-3 3I>>> Three-phase non-directional overcurrent protection,
instantaneous stage
OL3Cap 2) 51C 3I>3I< Three-phase overload protection for shunt capacitor banks
OV3Low 59-1 3U> Three-phase overvoltage protection, low-set stage
OV3High 59-2 3U>> Three-phase overvoltage protection, high-set stage
PSV3St1 2) 47-1 U1U2<>_1 Phase-sequence voltage protection, stage 1
PSV3St2 2) 47-2 U1U2<>_2 Phase-sequence voltage protection, stage 2
ROV1Low 59N-1 Uo> Residual overvoltage protection, low-set stage
ROV1High 59N-2 Uo>> Residual overvoltage protection, high-set stage
ROV1Inst 59N-3 Uo>>> Residual overvoltage protection, instantaneous stage
SCVCSt1 1) 25-1 SYNC1 Synchro-check / voltage-check function, stage 1
SCVCSt2 1) 25-2 SYNC2 Synchro-check / voltage-check function, stage 2
TOL3Cab 1) 49F 3Ith> Three-phase thermal overload protection for cables
TOL3Dev 2) 49M/G/T 3Ithdev> Three-phase thermal overload protection for devices
UV3Low 27-1 3U< Three-phase undervoltage protection, low-set stage
UV3High 27-2 3U<< Three-phase undervoltage protection, high-set stage
1) These functions are only supported in the feeder termi- 3) These functions are only supported in the feeder termi-
nal revisions of Release 1.5 or later. nal revisions of Release 2.5 or later.
2) These functions are only supported in the feeder termi- 4) This function is only supported in the feeder terminal
nal revisions of Release 2.0 or later revisions of Release 3.5 or later.
.

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 21: Measurement functions

Function ANSI device IEC symbol Description
no.
MEAI1 2) AI1 AI1 General measurement 1 / analog input on RTD/analog module
MEAI2 2) AI2 AI2 General measurement 2 / analog input on RTD/analog module
MEAI3 2) AI3 AI3 General measurement 3 / analog input on RTD/analog module
MEAI4 2) AI4 AI4 General measurement 4 / analog input on RTD/analog module
MEAI5 2) AI5 AI5 General measurement 5 / analog input on RTD/analog module
MEAI6 2) AI6 AI6 General measurement 6 / analog input on RTD/analog module
MEAI7 2) AI7 AI7 General measurement 7 / analog input on RTD/analog module
MEAI8 2) AI8 AI8 General measurement 8 / analog input on RTD/analog module
MEAO1 2) AO1 AO1 Analog output 1 on RTD/analog module
MEAO2 2) AO1 AO1 Analog output 2 on RTD/analog module
MEAO3 2) AO3 AO3 Analog output 3 on RTD/analog module
MEAO4 2) AO4 AO4 Analog output 4 on RTD/analog module
MECU1A Io Io Neutral current measurement, stage A
MECU1B Io_B Io_B Neutral current measurement, stage B
MECU3A 3I 3I Three-phase current measurement, stage A
MECU3B 2) 3I_B 3I_B Three-phase current measurement, stage B
MEDREC16 DREC DREC Transient disturbance recorder
1)

MEFR1 f f System frequency measurement

MEPE7 PQE PQE Three-phase power and energy measurement
MEVO1A Uo Uo Residual voltage measurement, stage A
MEVO1B 2) Uo_B Uo_B Residual voltage measurement, stage B
MEVO3A 3U 3U Three-phase voltage measurement, stage A
MEVO3B 2) 3U_B 3U_B Three-phase voltage measurement, stage B
1) These functions are only supported in the feeder termi- 2) These functions are only supported in the feeder termi-
nal revisions of Release 1.5 or later. nal revisions of Release 2.0 or later

Table 22: Power quality functions

Function ANSI device IEC symbol Description
no.
PQCU3H 1) PQ 3Inf PQ 3Inf Current waveform distortion measurement
PQVO3H 1) PQ 3Unf PQ 3Unf Voltage waveform distortion measurement
PQVO3Sd 2) PQ 3U<> PQ 3U<> Short duration voltage variations
1) These functions are only supported in the feeder termi- 2) This function is only supported in the feeder terminal
nal revisions of Release 2.0 or later. revisions of Release 3.5 or later


Table 23: Control functions

Function ANSI device IEC symbol Description
no.
CO3DC1 CO3DC1 I<->O 3DC1 Three-state disconnector (1) with indication
CO3DC2 CO3DC2 I<->O 3DC2 Three-state disconnector (2) with indication
COCB1 COCB1 I<->O CB1 Circuit breaker 1 control with indication
COCB2 COCB2 I<->O CB2 Circuit breaker 2 control with indication
COCBDIR COCBDIR CBDIR Direct open for CBs via HMI
CODC1 CODC1 I<->O DC1 Disconnector 1 control with indication
CODC2 CODC2 I<->O DC2 Disconnector 2 control with indication
CODC3 CODC3 I<->O DC3 Disconnector 3 control with indication
CODC4 CODC4 I<->O DC4 Disconnector 4 control with indication
CODC5 CODC5 I<->O DC5 Disconnector 5 control with indication
COIND1 COIND1 I<->O IND1 Switching device 1 indication
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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

Table 23: Control functions

Function ANSI device IEC symbol Description
no.
COIND2 COIND2 I<->O IND2 Switching device 2 indication
COIND3 COIND3 I<->O IND3 Switching device 3 indication
COIND4 COIND4 I<->O IND4 Switching device 4 indication
COIND5 COIND5 I<->O IND5 Switching device 5 indication
COIND6 COIND6 I<->O IND6 Switching device 6 indication
COIND7 COIND7 I<->O IND7 Switching device 7 indication
COIND8 COIND8 I<->O IND8 Switching device 8 indication
COLOCAT COLOCAT I<->O POS Logic-controlled control position selector
COPFC 1) 55 COPFC Power factor controller
COSW1 COSW1 SW1 On/off switch 1
COSW2 COSW2 SW2 On/off switch 2
COSW3 COSW3 SW3 On/off switch 3
COSW4 COSW4 SW4 On/off switch 4
MMIALAR1 ALARM1 ALARM1 Alarm channel 1, LED indicator
MMIALAR2 ALARM2 ALARM2 Alarm channel 2, LED indicator
MMIALAR3 ALARM3 ALARM3 Alarm channel 3, LED indicator
MMIALAR4 ALARM4 ALARM4 Alarm channel 4, LED indicator
MMIALAR5 ALARM5 ALARM5 Alarm channel 5, LED indicator
MMIALAR6 ALARM6 ALARM6 Alarm channel 6, LED indicator
MMIALAR7 ALARM7 ALARM7 Alarm channel 7, LED indicator
MMIALAR8 ALARM8 ALARM8 Alarm channel 8, LED indicator
MMIDATA1 MMIDATA1 MMIDATA1 MIMIC data monitoring point 1
MMIDATA2 MMIDATA2 MMIDATA2 MIMIC data monitoring point 2
MMIDATA3 MMIDATA3 MMIDATA3 MIMIC data monitoring point 3
MMIDATA4 MMIDATA4 MMIDATA4 MIMIC data monitoring point 4
MMIDATA5 MMIDATA5 MMIDATA5 MIMIC data monitoring point 5

Table 24: Condition monitoring functions

Function ANSI device IEC symbol Description
no.
CMBWEAR1 CB wear1 CB wear1 Circuit-breaker electric wear 1
CMBWEAR2 CB wear2 CB wear2 Circuit-breaker electric wear 2
CMCU3 MCS 3I MCS 3I Supervision function of the energizing current input circuit
CMGAS1 CMGAS1 GAS1 Gas pressure monitoring
CMGAS3 1) CMGAS3 GAS3 Three-pole gas pressure monitoring
CMSCHED CMSCHED SCHED Scheduled maintenance
CMSPRC1 CMSPRC1 SPRC1 Spring charging control 1
CMTCS1 TCS1 TCS1 Trip circuit supervision 1
CMTCS2 TCS2 TCS2 Trip circuit supervision 2
CMTIME1 TIME1 TIME1 Operate time counter 1 for the operate time used (e.g. motors)
CMTIME2 TIME2 TIME2 Operate time counter 2 for the operate time used (e.g. motors)
CMTRAV1 CMTRAV1 TRAV1 Breaker travel time 1
CMVO3 MCS 3U MCS 3U Supervision function of the energizing voltage input circuit
1) This function is only supported in the feeder terminal
revisions of Release 2.0 or later

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Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG

References Additional information

Feeder Terminal REF 54_ Technical 1MRS750527-MUM
ReferenceManual, General
Technical Descriptions of Functions 1MRS750889-MCD (CD-ROM only)
Installation Manual 1MR 750526-MUM
Operator’s Manual 1MR 750500-MUM
Technical Reference Manual RER 103 1MRS750532-MUM
Technical Reference Manual RER 123 1MRS751143-MUM
Protection & Control Terminals REF 54_, REM 54_, 1MRS750745-MUM
REC 523 Configuration Guideline

m
Bus Connection Module RER 133 Technical 1MRS755163
Description

Echelon, LON and LonTalk are registered trademarks of Echelon Corporation.

All other product names or brands are trademarks, registered trademarks, or service marks of their respective owners.

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ABB Oy
Distribution Automation
P.O. Box 699
FI-65101 Vaasa, FINLAND
Tel +358 10 22 11
Fax +358 10 224 1094
www.abb.com/substationautomation