01

Multifunction IEDs

MiCOM Px30 Series

Rail protection equipment

The rail protection devices of the MiCOM Px30 series

are designed for selective protection of a.c. catenary
systems and their supplies.
Proven protective functions allow a wide range of
applications to protect supplies and catenaries in classic-
and autotransformer-fed (AT) systems.Additionally, a
Modular devices P138, P436/P438, P638
suite of backup protection and automation functions is
available.
Relevant protection parameters can be stored in four
independent setting groups to configure the protection
to different operating conditions or alternative feeding.
A user-friendly control interface and several
communication ports allow simple configuration, and
extensive polling of information.
The protection device provides numerous integrated
communication protocols for both serial data transmission
(IEC 60870-5, MODBUS, DNP3) and Ethernet based
communication (IEC 61860) allowing easy connection
to virtually all substations and catenary network
management systems.

Customer benefits Additionally, these catenary protection devices feature

InterMiCOM teleprotection, typically used to exchange
• 1A/5A both supported in a single binary information between line ends.
device
The modular design of the P138, P638 and P436/P438
• Two communication interface ports
cases and a variable configuration tailored to actual
(to SCADA, and engineer MODEM requirements provide users a flexible concept for easy
dial-up) integration of protection equipment in substations.
• IEC 61850 Ethernet communication These devices in modular design are available for rack
available in all devices mounting, flush panel mounting as well as for wall
surface mounting.
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Multifunction IEDs MiCOM Px30 for Railways

MiCOM Px30 series Global Functions

rail protection equipment All the devices have the following global functions:
Application • Setting Group Selection
The rail protection devices of the MiCOM Px30 • Operating data measurement, operating data
series provide a suite of protection functions. recording
Different applications determine the functionality • Overload recording with overload data
of the devices. The following device variants are acquisition
available:
• Fault recording with recording of all input
• P138 Directional Overcurrent Protection for measurements and fault data acquisition
Rail Applications, optionally for 16 2/3, 25, 50,
and 60 Hz; Main Functions
• P638 Transformer Differential Protection,
Main functions are protection and control features
optionally for 16 2/3, 25, 50, and 60 Hz;
• P438 Rail Catenary Protection Device for which can be individually configured or disabled
classic- and two-phase AT feeders, optionally to suit a particular application. Disabled functions
for 25, 50, and 60 Hz; are hidden from view, to simplify the menu
• P436 Rail Catenary Protection Device for presentation.
classic- and two-phase AT feeders, 16 2/3 Hz.
Function overview P138 P436 P438 P638
21 DIST Distance protection - • • -
Parallel feed - Option - -
Single- and two-wire system - Option • -
50/27 SOTF Switch on to fault protection - • • -
30/74 C&VTS Current & voltage measuring-circuit monitoring - • • -
BUOC - • • -
DFRST Defrost protection - - • -
87 DIFF Differential protection - - - •
DIF_A, DIF_B Transverse differential protection - - - •
50/51 DTOC - • • -
stage
short-circuit direction - • • -
50/51/67 DTOC1 • - - •
50/51 DTOC2 - - - •
50 DTOCN Transformer tank protection • - - •
51 IDMT Inverse-time overcurrent protection • • • •
short-circuit direction • • • •
79 RECLS Auto-recloser (in development) - • • -
49 THERM Thermal overload protection • • • •
27/59 V<> Over-/undervoltage protection • • • •
81 f<> Over-/underfrequency protection • - - •
50BF/62 CBF, CBF_x Circuit breaker failure protection • • • •
CBS, CBS_x Circuit breaker condition monitoring (in development) • • • •
38/49 LIMIT Limit value monitoring • • • •
38/49 LIM_x Limit value monitoring • - - •
LOGIC Programmable logic • • • •
2 communication interface ports (options: serial or Ethernet),
COMMx / IEC Option Option Option Option
IRIG-B
COMM3 InterMiCOM telecontrol interface - Option - -
INP/OUTP Binary signal inputs / output relays (max. number) 22 / 48 32 / 46 32 / 46 32 / 46
RTDmA /
Analogue input/output (2x 20mA output) (20 mA input, RTD inputs) Option Option Option Option
mA_OP

MiCOM Px30 catenary protection devices

always provide comprehensive functionality.
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Multifunction IEDs MiCOM Px30 for Railways

Functional diagram
MiCOM P138

Communication COMM1 COMM2 IEC Self-monitoring

Recording and
Overload
measured
to the network control level / substation control level recording
data acquisition
/ via modem ... via RS485 or optical fibre cable with
IEC 60870-5-101, -103, MODBUS, DNP3, Courier Measured
LIMIT Fault recording
or via RS485 or optical fibre cable with IEC 61850 values
LOGIC

e.g. transformer tank 50/51 67 51 67 50 49 27/59 81 50BF/62

CBS
DTOC DTOC IDMT IDMT DTOCN THERM V<> f<> CBF_x

IE

RTDmA mA_OP
Standard Further
equipment
VTs fitted
options
Overcurrent protection P138

MiCOM P436/P438

Communication COMM1 COMM2 IEC COMM3 IRIG-B Self-monitoring

Recording and
measured Overload
to the network control level / substation control level recording
data acquisition
/ via modem ... via RS485 or optical fibre cable with
IEC 60870-5-101, -103, MODBUS, DNP3, Courier
LIMIT Measured
or via RS485 or optical fibre cable with IEC 61850 values Fault recording
LOGIC

21 50/27 30/74 50/51 51 49 27/59 50BF/62 79

BUOC CBS
DIST SOTF C&VTS DTOC IDMT THERM V<> CBF RECLS

I1
I
I2 Ф
V1
V
V2 Ф

RTDmA mA_OP
Standard Further
equipment options
Catenary protection P438/P436

MiCOM P638
Communication COMM1 COMM2 IEC Self-monitoring Recording and
measured Overload
to the network control level / substation control level data acquisition recording
/ via modem ... via RS485 or optical fibre cable
with IEC 60870-5-101, -103, MODBUS, DNP3,
Measured
Courier or via RS485 or optical fibre cable with IEC 61850 LIM_x LIMIT Fault recording
values
LOGIC

50BF/62
CBF_2

A 87 50/51/67 50/51 51/67 49 50 27/59 81 50BF/62

DIFF_A DIFF_B
DIFF DTOC1 DTOC2 IDMT THERM DTOCN V<> f<> CBF_1

B
IA

IE

IB

RTDmA mA_OP
Standard Further
equipment options Transformer differential protection P638

(Description of abbreviations see functional overview)

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Multifunction IEDs MiCOM Px30 for Railways

MiCOM P138 If a time delay is set, the protection element will

work as single-stage definite-time overcurrent
Overcurrent protection protection and can be used for further applications
provided that the associated CT input is
The P138 is designed for a variety of applications
appropriately wired.
in rail substations.
Thermal overload protection
It features both definite-time and inverse-time
overcurrent protection and the user can select Using this function it is possible to realise
from a multitude of tripping characteristics. a thermal overload protection for lines and
Both functions may be configured as directional transformers. The current is used to track a first-
elements. The trip decision may be made order thermal replica according to IEC 255-8.
dependent on both an undervoltage condition and An optional PT100 input or the 20mA input can be
also a minimum voltage. used to measure the coolant temperature in the
Using these functions the P138 can be used thermal replica. Tracking of the thermal replica
as a main and backup protection device for may be based on relative or absolute temperature
catenary systems. measurements.
Over-/undervoltage protection
The over- and undervoltage protection enables
Forward multistage voltage monitoring.
A dead line monitoring threshold can be set for
U
_
the undervoltage stages in order to limit operation
to falling voltage, rather than breaker open
β I scenarios.

γ Over-/underfrequency protection
Apart from a pure over- and underfrequency
monitoring, the four-stage frequency protection
Reverse allows a combination with differential frequency
gradient monitoring (df/dt) for system decoupling
applications or with average frequency gradient
monitoring (Df/Dt) for load shedding applications.
Definite and inverse time directional characteristic Circuit breaker failure protection
The P138 provides two independent trip circuits.
Fast definite-time overcurrent element as
There is a dedicated circuit breaker failure
transformer tank protection (restricted earth
protection for each trip circuit to monitor the
fault protection)
flowing residual current and to provide the
A dedicated CT input and a fast overcurrent possibility to trigger a second trip device or an
element are provided for use as backup tank upstream protection device.
protection in transformer feeders.
The P138 can detect and immediately trip for
currents which occur due to a transformer
MiCOM P138 is the standard choice for
earth fault.
main and backup protection in many rail
applications.
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Multifunction IEDs MiCOM Px30 for Railways

MiCOM P436, P438 DTOC/IDMT protection

Distance protection A three-stage definite-time overcurrent protection
function (DTOC) as well as an IDMT overcurrent
The protection devices P436 and P438 have
element can be activated in parallel to the distance
three distance zones which may be either
protection. One definite-time stage is designed
set with circular or polygonal (quad.) tripping
as high-current protection, and generates a trip
characteristics. Each zone can be operated as
command if the trip condition has been detected
forward-, reverse- or non-directional. Each
for two consecutive samples. In conjunction with
direction can be set with a different reach,
an optional static trip unit it is possible to obtain a
allowing offset zones to be applied.
trip command time of 2 milliseconds.
Fast dynamic reach changes can be implemented,
to account for differing feeding states of the Thermal overload protection
catenary. Using this function it is possible to realise a
Tripping timer stages thermal overload protection for the catenaries.
The current is used to track a first-order thermal
Each of the distance zones is assigned to a replica according to IEC 255-8.
settable short-circuit timer stage. Another timer
An optional PT100 input or the 20mA input can
stage for overload conditions is assigned to the
be used to measure the coolant temperature in
second and third distance zones.
the thermal replica.
Switch on to fault protection
Where the live/dead status of adjacent lines
Should a line branch be temporarily wired to affects the thermal capacity of the protected
ground then a corresponding circuit breaker could circuit, a dynamic switching of the reference
be mistakenly switched on to a short circuit. current is possible.
Therefore, this function allows instantaneous
Circuit breaker failure protection
protective tripping during an adjustable time
window after issuing the manual close command. A circuit breaker failure protection element is
provided for the trip circuit to monitor the flowing
Backup definite-time overcurrent protection residual current and to provide the possibility
When a fault occurs in the voltage measuring to trigger a second trip device or an upstream
circuit, distance measurement is no longer protection device.
possible. In this case, two-stage backup
definite-time overcurrent protection can be
enabled automatically.
X X
Zxv

Zxv

β β
αL

Rgxr α Rgxr
Rgxv R γ
Rgxv R
γ

Zxr Zxr

Trip characteristics

MiCOM P436 and P438 provide fast overhead

line protection, safeguarding the catenary.
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Multifunction IEDs MiCOM Px30 for Railways

MiCOM P638 I diff

5
Differential protection
Based on the CT ratios and winding voltage
ratings, this function self-sets to match the
4 Tripping area
protected transformer. Adjustment of amplitude
matching is done automatically by an inbuilt
setting wizard.
The protection device itself determines the I diff >>> 3

matching factors and checks them automatically

for compliance with internally allowed ranges. m2
Inadmissibly high factors are rejected by the I diff >> 2

protection device.
Biased area m1
Zero sequence filtering
1
Restrained area
For transformers with a grounded centre tap (e.g.
required for feeding of autotransformer sections) I diff >

the differential protection device is equipped with

zero sequence filtering which can be disabled
1 2 3 4 5 6 I bias
independent of the remaining settings. I H, m2
Differential protection characteristics
Inrush stabilisation
To provide stable operation of a transformer
Idiff
during inrush or in the presence of external faults
with CT saturation the differential protection has 5

the following stabilisation criteria:

• Inrush stabilisation
Tripping area
• Saturation discriminator 4

Transverse differential protection

Dedicated transverse differential protection 3

monitors the currents in the high and low voltage

sides, providing additional restricted earth fault
protection. 2

Transformer tank protection

Transformers in rail substations are often
isolated from the earthing system of the overall 1 Restrained area
plant and only grounded at a single point via a Idiff >
tank protection CT. Thus a sensitively adjusted
definite-time overcurrent protection can detect
1 2 3 4 5 6 Ibias
and immediately interrupt currents which occur in
the case of an earth fault. Transverse differential protection characteristics

Overcurrent protection
The P638 features definite-time and inverse-time
overcurrent protection functions with a variety of
selectable characteristics. Both functions may be
configured as directional elements. The trip
MiCOM P638 ensures effective protection for
decision may be made dependent on both an
undervoltage condition and also a minimum single-phase transformers in railway systems.
voltage.
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Multifunction IEDs MiCOM Px30 for Railways

Information interfaces
Information is exchanged through the local
control panel, the PC link, or two optional rear
communications interfaces (channel 1, channel 2).
Via one of the two communication interfaces
(protocols: IEC 60870-5-103, IEC 60870-5-101,
DNP 3.0, MODBUS, or IEC 61850) it is possible
to integrate the numeric protection devices in a
substation control and protection or telecontrol
system.
The second communication interface (fixed as:
IEC 60870-5-103) is provided for remote access.
External time synchronisation can be implemented
via one of the protocols, or by using the IRIG-B
input.

COMM1 (serial) / IEC (Ethernet)

Interface to substation / system control

HMI
Full access to all settings,
signals and measured values

MODEM MODEM
COMM2
Interface to maintenance PC

PC
Local interface port
Information interfaces

Proven protection, trend-setting

communication, comprehensive local
control, simple setting.
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Multifunction IEDs MiCOM Px30 for Railways

Device History
• PD 591: First numerical distance relay for
catenary systems for a rated frequency of
16 2/3 Hz, initial launch in 1992.

• PS 492: First numerical multi-functional

overcurrent protection device for railway
application, since 2000.

• PQ 792: Numerical transformer differential

protection for single-phase railway traction
transformers with zero sequence current
filtering and tank protection, initial launch
in 2000.

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EnergyAutomation-DS-Px30Rail-1815-EN 10-2010