Overcurrent and earth-fault relay REJ 525

1MRS 751205-MBG
Issued: November 2001
Status: Updated
Version: B/16.10.2002
Data subject to change without notice

Features • Three-phase low-set overcurrent stage • Galvanically isolated binary input with a
with definite-time or inverse definite mini- wide input voltage range
mum time (IDMT) characteristic
• All settings can be modified with a personal
• Three-phase high-set overcurrent stage computer
with instantaneous or definite-time charac-
• HMI with an alphanumeric LCD and
teristic
manoeuvring buttons
• Phase discontinuity protection
• IEC 60870-5-103 and SPA bus communi-
• Low-set non-directional earth-fault stage cation protocols
with definite-time or IDMT characteristic
• Two normally open power output contacts
• High-set non-directional earth-fault stage
• Two change-over signal output contacts
with instantaneous or definite-time charac-
teristic • Output contact functions freely config-
urable for desired operation
• Circuit-breaker failure protection (CBFP)
• Optical PC-connector for two-way data
• Disturbance recorder:
communication (front)
- recording time up to 10 seconds
• RS-485 connector (rear) for system com-
- triggering by a start or a trip signal from munication
any protection stage and/or by a binary
• Continuous self-supervision of electronics
input signal
and software. At an internal relay fault
- records four analogue channels and up (IRF), all protection stages and outputs are
to eight user-selectable digital channels blocked.
- adjustable sampling rate • User-selectable rated frequency 50/60 Hz
• Non-volatile memory for • User-selectable password protection for
the HMI
- up to 60 event codes
• Display of primary current values
- setting values
• Demand values
- disturbance recorder data
• Multi-language support
- recorded data of the five last events with
time stamp
- number of starts for each stage
- alarm indication messages and LEDs
showing the status at the moment of
power failure
- maximum pick-up currents

1
 Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

Application The combined overcurrent and earth-fault If the high-set stage is given a setting value
relay REJ 525 is a secondary relay which is within the lower part of the setting range, the
connected to the current transformers of the relay module will have two nearly identical
object to be protected. The overcurrent unit stages. In this case, the relay can be used in
and the earth-fault unit continuously measure two-stage load shedding applications.
the phase currents and the neutral current of
the object. On detection of a fault, the relay The protection functions are independent of
will start, trip the circuit breaker, provide each other and have their own setting groups
alarms, record fault data, etc., in accordance and data recordings. The overcurrent protec-
with the application and the configured relay tion function uses conventional current trans-
functions. former measurement.

The overcurrent unit includes low-set stage An output contact matrix allows start or trip
I> and high-set stage I>> and the earth-fault signals from the protection stages to be
unit low-set stage I0> and high-set stage I0>>. routed to the desired output contact.

Design The relay includes of a high-set and low-set The high-set stage can be set out of operation.
overcurrent unit, a high-set and low-set earth- This state will be indicated by dashes on the
fault unit, a phase discontinuity unit and a cir- LCD and by “999” when the set start value is
cuit-breaker failure protection unit. Further, read via serial communication.
the relay includes an HMI module, a self-su-
pervision system and a disturbance recorder. The set start value of stage I>>, I>>/In, can be
automatically doubled in a start situation, e.g.
when the object to be protected is connected
Overcurrent unit to a distribution network. Thus a set start
When the phase currents exceed the set start
value below the connection inrush current
value of low-set stage I>, the overcurrent unit
level can be selected for stage I>>. A start
will start to deliver a start signal after a ~ 55 situation is defined as a situation where the
ms’ start time. When the set operate time at
phase current rises from a value below 0.12 x
definite-time characteristic or the calculated
I> to a value above 1.5 x I> in less than 60
operate time at inverse definite minimum ms. The start situation ends when the current
time (IDMT) characteristic elapses, the over-
falls below 1.25 x I>.
current unit will deliver a trip signal.

When the phase currents exceed the set start Phase discontinuity unit
value of high-set stage I>>, the overcurrent The phase discontinuity protection function
unit will start to deliver a start signal after a monitors the minimum and maximum phase
~30 ms’ start time. When the set operate time currents and calculates the difference
elapses, the overcurrent unit will deliver a trip between them.
signal.
The phase discontinuity protection stage will
It is possible to block the start and the trip- start when the current difference exceeds the
ping of an overcurrent stage by applying an start value, ∆I, of the protection stage. Should
external binary input signal to the relay. the phase discontinuity situation last longer
than the set operate time, the protection stage
The low-set stage of the overcurrent unit can will deliver a trip signal which can be routed
be given either a definite-time or an IDMT to the desired output relay contact. It is possi-
characteristic. At IDMT characteristic, six ble to block the start and the tripping of the
time/current curve groups are available, of protection stage by applying an external
which four comply with the IEC 60255 stan- binary input signal to the relay. When the val-
dard: the normal inverse, very inverse, ues of the measured currents fall below 0.1 x
extremely inverse and long-time inverse. The In, the function will no longer be in use.
two additional inverse-time curve groups,
referred to as RI and RD, are special curve The phase discontinuity function can be set
groups according to ABB praxis. out of operation. This state will be indicated
by dashes on the LCD and “999” when the
The inverse-time function of stage I> can be set start current value is read via serial com-
set to be inhibited when stage I>> starts. In munication.
this case the operate time will be determined
by stage I>>.
2
Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

Earth-fault unit below 0.12 x I0> to a value above 1.5 x I0> in

When the earth-fault current exceeds the set less than 60 ms. The start situation ends when
start value of low-set stage I0>, the earth-fault the current falls below 1.25 x I0>.
unit will start to deliver a start signal after a ~
60 ms’ start time. When the set operate time Circuit breaker failure
at definite-time characteristic or the calcu-
lated operate time at IDMT characteristic
protection (CBFP) unit
The CBFP unit will generate a trip signal via
elapses, the earth-fault unit will deliver a trip
power output 2 (PO2) if the fault has not been
signal.
cleared on expiration of the set operate time
0.10 s...1.00 s.
When the earth fault current exceeds the set
start value of high-set stage I0>>, the earth-
fault unit will start to deliver a start signal Normally, the CBFP unit controls the up-
stream circuit breaker. It can also be used for
after a ~ 40 ms’ start time. When the set
tripping via redundant trip circuits of the
operate time elapses, the earth-fault unit will
deliver a trip signal. same circuit breaker. The CBFP unit is acti-
vated with a soft-ware switch.
It is possible to block the start and the trip-
ping of an earth-fault stage by applying an Disturbance recorder
external binary input signal to the relay. The REJ 525 includes an internal disturbance
recorder which records the momentary mea-
The low-set stage of the earth-fault unit can sured values, or the RMS curves of the mea-
be given either a definite-time or an IDMT sured signals, and up to eight user-selectable
characteristic. At IDMT characteristic, six digital signals: the external binary input sig-
time/current curve groups are available, of nal and the states of the internal protection
which four comply with the IEC 60255 stan- stages. The disturbance recorder can be set to
dard: the normal inverse, very inverse, ex- be triggered by a start or a trip signal from
tremely inverse and long-time inverse. The any protection stage and/or by an external
two additional inverse-time curve groups, binary input signal, and either on the falling
referred to as RI and RD are special curve or rising triggering edge. The ratio of the pre-
groups according to ABB praxis. and post-triggering of the recording can be
set.
The inverse-time function of stage I0> can be
set to be inhibited when stage I0>> starts. In The recording length varies according to the
this case, the operate time will be determined selected sampling frequency. The RMS curve
by stage I0>>. is recorded by selecting the sampling fre-
quency to be the same as the nominal fre-
The high-set stage can be set out of operation. quency of the relay. See the table below for
This state will be indicated by dashes on the details:
LCD and by “999” when the set start value is
read via serial communication. 1RPLQDO 6DPSOLQJ 5HFRUGLQJ
IUHTXHQF\+] IUHTXHQF\+] OHQJWKV
The set start valueof stage I0>>, I0>>/In, can 50 800 0.64
be automatically doubled in a start situation, 50 400 1.28
e.g. when the object to be protected is con- 50 50 10.24
nected to a distribution network. Thus a set
start value below the connection inrush cur-
60 960 0.53
rent level may be selected for stage I0>>. A
start situation is defined as a situation where 60 480 1.06
the earth-fault current rises from a value 60 60 8.53

3
 Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

HMI module rate of 9.6 kbps. The IEC 60870-5-103 proto-

The HMI of the REJ 525 is equipped with six col is used to transfer mesurand and status
push-buttons and an alphanumeric 2 x 16 data from the slave to the master. Disturbance
characters’ LCD. The push-buttons are used recorder data, however, cannot be transferred
for navigating in the menu structure and for using this protocol.
adjusting set values.
The REJ 525 is provided with two serial com-
An HMI password can be set to protect all munication ports, one on the rear panel and
user-changeable values from being changed the other on the front panel.
by an unauthorised person.
The REJ 525 is interfaced with a fibre-optic
The REJ 525 offers you multi-language sup- bus by means of the bus connection module
port. The following languages are available RER 103 via the D9S-type RS-485 connector
for the HMI menu: English, German, French, on the rear panel of the device. The RER 103
Spanish, Italian, Swedish and Finnish. enables the use of either the SPA bus or the
IEC 60870-5-103 communication protocol.
The use of the IEC 60870-5-103 protocol
Self-supervision (IRF) unit normally requires the fibre-optic star coupler
The REJ 525 is provided with an extensive RER 125.
self-supervision system which continuously
supervises the software and the electronics of The optical PC-connector on the front panel
the relay. It manages run-time fault situations is used to connect the relay to the CAP
and informs the user about an existing fault 501/505 setting and configuration tools. The
via a LED on the HMI and a text message on front interface uses the SPA bus protocol. The
the LCD. optical PC-connector galvanically isolates the
PC from the relay. Since this connector is
Communication capabilities standardized for ABB relay products, only
The REJ 525 can be connected to a substation one connecting cable (ABB art. No 1MKC-
automation or monitoring system using either 950001-1) will be required.
the SPA bus communication protocol or the
IEC 60870-5-103 remote communication The REJ 525 can also be connected to the
protocol. Both protocols are supported in the Lon bus using a LON-SPA Gateway.
same device.
Auxiliary supply voltage
The SPA bus communication protocol is an The REJ 525 requires a secured auxiliary
asynchronous serial communication protocol voltage supply to operate. The internal power
(1 start bit, 7 data bits + even parity, and 1 supply of the relay forms the voltages requir-
stop bit) with a selectable data transfer rate ed by the relay electronics. The power supply
(default 9.6 kbps). It is a master/slave proto- is a galvanically isolated (flyback-type)
col supporting one master device and several DC/DC converter. When the auxiliary volt-
slave devices. The SPA bus protocol can be age is connected, the READY indicator LED
used to transfer data, e.g. measured currents, on the front panel will be on.
registered values, events, and relay settings,
between the master and the slave device. The primary side of the power supply is pro-
tected with a fuse located on the PCB of the
The REJ 525 supports the IEC 60870-5-103 relay. The fuse size is 3.15 A (slow).
remote communication protocol in the unbal-
anced transmission mode with a data transfer

4
 Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

Technical data 7DEOH'LPHQVLRQV

Width frame 111.4 mm, box 94 mm
Height frame 265.9 mm (6U), box 249.8 mm
Depth 235 mm (245.1 mm with a protective
rear cover, available as an option)
Enclosure size 1/4 (x 19")
Weight of the relay ~3.3 kg

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Uaux rated Ur =110/120/220/240 V ac
Ur =48/60/110/125/220 V dc
Uaux variation 80...265 V ac
38...265 V dc
Relay power start-up time, typical 300 ms
Burden of auxiliary voltage under quiescent/operating condi- ~ 5 W/~10 W
tion
Ripple in dc auxiliary voltage Max 12% of the dc value
Interruption time in the auxiliary dc voltage without resetting the < 30 ms at 48 V dc
relay < 100 ms at 110 V dc
< 500 ms at 220 V dc

7DEOHEnergizing inputs
Rated frequency 50/60 Hz ±5 Hz
Rated current, In 0.2 A 1A 5A
Thermal withstand capability
Continuously 1.5 A 4A 20 A
For 1 s 20 A 100 A 500 A
Dynamic current withstand
Half-wave value 50 A 250 A 1250 A
Input impedance < 750 mΩ < 100 mΩ < 20 mΩ

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Measured currents on phases L1, L2 and L3 as multiples of the 0...50 x In
rated currents of the energizing inputs
Earth-fault current as a multiple of the rated current of the 0...8 x In
energizing input

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Operating range 18...265 V dc
Rated voltage 24/48/60/110/220 V dc
Current drain ~ 2...25 mA
Power consumption < 0.8 W

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Rated voltage 250 V ac/dc
Continuous carry 5A
Make and carry for 3.0 s 8A
Make and carry for 0.5 s 10 A
Breaking capacity when the control circuit time-constant 1 A/0.25 A/0.15 A
L/R < 40 ms, at 48/110/220 V dc
Minimum contact load 100 mA at 24 V ac/dc

5
 Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

7DEOH3RZHURXWSXWV 3232
Rated voltage 250 V ac/dc
Continuous carry 5A
Make and carry for 3.0 s 15 A
Make and carry for 0.5 s 30 A
Breaking capacity when the 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 at 24 V ac/dc

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Front side IP 54 (flush-mounted)
Rear side, connection terminals IP 20
Note!
A rear protective cover (accessory part) can be used to protect and shield the rear of the case.

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Specified service temperature range -10...+55 °C
Transport and storage temperature range -40...+70 °C
According to the IEC 60068-2-48
Dry heat test According to the IEC 60068-2-2
Dry cold test According to the IEC 60068-2-1
Damp heat test, cyclic According to the IEC 60068-2-30

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EMC immunity test level requirements consider the demands in the generic standard EN 50082-2.
1 MHz burst disturbance test, class III According to the IEC 60255-22-1
Common mode 2.5 kV
Differential mode 1.0 kV
Electrostatic discharge test, class III According to the IEC 61000-4-2 and
For contact discharge IEC 60255-22-2
For air discharge 6 kV
8 kV
Radio frequency interference tests
Conducted, common mode According to the IEC 61000-4-6,
IEC 60255-22-6 (2000)
10 V (rms), f = 150 kHz...80 MHz
Radiated, amplitude-modulated According to the IEC 61000-4-3 and
IEC 60255-22-3 (2000)
10 V/m (rms), f = 80...1000 MHz
Radiated, pulse-modulated According to the ENV 50204 and
IEC 60255-22-3 (2000)
10 V/m, f = 900 MHz
Radiated, test with a portable transmitter According to the IEC 60255-22-3 (1989),
method C; f = 77.2 MHz, P = 6 W;
f = 172.25 MHz, P = 5W
Fast transient disturbance tests According to the IEC 60255-22-4 and
Binary input IEC 61000-4-4
Other terminals 2 kV
4 kV
Surge immunity test According to the IEC 61000-4-5
Power supply 4 kV, line-to-earth, 2 kV, line-to-line
I/O ports 2 kV, line-to-earth, 1 kV, line-to-line

Power frequency (50 Hz) magnetic field According to the IEC 61000-4-8
100 A/m continuous
6
Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

Voltage dips and short interruptions According to the IEC 61000-4-11

30%/10 ms
60%/100 ms
60%/1000 ms
> 95%/5000 ms
Electromagnetic emission tests According to the EN 55011 and EN 50081-2
Conducted, RF-emission EN 55011, class A, IEC 60255-25
(Mains terminal)
Radiated RF-emission EN 55011, class A, IEC 60255-25
CE approval Complies with the EMC directive 89/336/EEC
and the LV directive 73/23/EEC

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Dielectric tests According to the IEC 60255-5
Test voltage 2 kV, 50 Hz, 1 min
Impulse voltage test According to the IEC 60255-5
Test voltage 5 kV, unipolar impulses, waveform 1.2/50 µs,
source energy 0.5 J
Insulation resistance measurements According to the IEC 60255-5
Isolation resistance > 100 MΩ, 500 V dc
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Vibration tests (sinusoidal) According to the IEC 60255-21-1, class I
Shock and bump test According to the IEC 60255-21-2, class I
Seismic test According to the IEC 60255-21-3, class 2

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Rear interface, connector X2.2
RS-485 connection for the fibre-optic interface module RER 103
SPA bus or IEC 60870-5-103 protocol
4.8 or 9.6 kbps
Front interface
Optical RS-232 connection for opto-cable 1MKC 950001-1
SPA bus protocol
4.8 or 9.6 kbps

7
 Overcurrent and earth-fault relay REJ 525
1MRS 751205-MBG

Connection dia-
gram L1
L2
L3
0 -

PC

- 1

Rx Tx
I O

1MRS090701

RER 103
+
+

1MKC950001-1
Uaux ~ +
BI
+

-
IRF SO2 SO1 PO2 PO1

X1.1 1 2 3 4 5 6 7 8 9 10 11 12 X2.1 17 18 1 2 13 14 15 10 11 12 7 8 9 5 6 3 4
+ + + Optical Serial
*

~
5A
1A

5A
1A

5A
1A
PC-interface port

-
IRF
START SGR1 X X 2 1
3I>
5 SGB1 SGR2 4 3 X X
Blocking of stage I> TRIP
START
SGR3 X X 2 1
3I>>
6 SGB1 SGR4 4 3 X X
Blocking of stage I>> TRIP

*REJ525B 415BAA: 2=5A DI> START SGR9 X X 2 1

3=1A
1 SGB2 Blocking of stage DI> TRIP SGR10 4 3 X X
REJ525B 412BAA: 2=1A
3 = 0.2 A SGR5 X X 2 1
Io> START
7 SGB1 Blocking of stage Io> TRIP SGR6 4 3 X X

SGR7 X X 2 1
Io>> START
8 SGB1 SGR8 4 3 X X
Blocking of stage Io>> TRIP

1 SGB1
INDICATIONS CLEARED
I/O

2 SGB1 OUTP. CONT. UNLATCHED

AND INDIC. CLEARED x = Factory Default
3 SGB1 MEMORIZED VALUES AND
INDIC. CLEARED; OUTPUT
CONTACTS UNLATCHED

ConD1_525
4 SGB1
SWITCHGROUP SELECTION

Fig. 1 Connection diagram of the combined overcurrent and earth-fault relay. The residual current is
measured via a core-balance current transformer.

L1
L2
L3
0 -

PC

- 1

Rx Tx
I O

RER 103
+

1MRS090701
+
1MKC950001-1
Uaux ~ +

BI IRF SO2 SO1 PO2 PO1

X1.1 1 2 3 4 5 6 7 8 9 10 11 12 X2.1 17 18 1 2 13 14 15 10 11 12 7 8 9 5 6 3 4
+ + +
*

~
5A
1A

5A
1A

5A
1A

Optical Serial
PC-interface port
+

IRF
START SGR1 X X 2 1
3I>
5 SGB1 SGR2 4 3 X X
Blocking of stage I> TRIP
START
SGR3 X X 2 1
3I>>
6 SGB1 SGR4 4 3 X X
Blocking of stage I>> TRIP
*REJ525B 415BAA: 2=5A
3=1A SGR9 X X 1
DI> START 2
REJ525B 412BAA: 2=1A 1 SGB2 Blocking of stage DI> TRIP SGR10 4 3 X X
3 = 0.2 A
SGR5 X X 2 1
Io> START
7 SGB1 SGR6 4 3 X X
Blocking of stage Io> TRIP

Io>> START SGR7 X X 2 1

8 SGB1 Blocking of stage Io>> TRIP SGR8 4 3 X X

1 SGB1
INDICATIONS CLEARED I/O

2 SGB1 OUTP. CONT. UNLATCHED

AND INDIC. CLEARED x = Factory Default
3 SGB1 MEMORIZED VALUES AND
INDIC. CLEARED; OUTPUT
CONTACTS UNLATCHED
4 SGB1
ConD2_525

SWITCHGROUP SELECTION

Fig. 2 Connection diagram of the combined overcurrent and earth-fault relay. The residual current is
measured via a summation connection of the phase current transformers.

8
Ordering The order number identifies the hardware This number is labelled on the marking strip
version of the relay as described below. on the front panel.

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Order number (I0 inputs 0.2 A/1 A) REJ525B 412BAA
(Article nr:1MRS091412-BAA)
Order number (I0 inputs 1 A/5 A) REJ525B 415BAA
(Article nr:1MRS091415-BAA)

$FFHVVRULHV
Protective cover for rear connectors 1MRS060132
Flush mounting kit 1MRS050209
Semi-flush mounting kit 1MRS050253
Wall mounting kit 1MRS050240
Side-by-side mounting kit 1MRS050241
19" Rack mounting kit 1MRS050257
Optic bus connection module RER 103 1MRS090701
Opto-cable 1MKC950001-1

Configuration, setting and SA system • CAP 501 Relay Setting Tools; CAP 501 v.
tools 2.1.1, or later
The following tool versions are needed to
support the new functions and features of • LIB 510 Library for MicroSCADA; LIB
REJ 525 Release B: 510 v. 4.0.3-1, or later
• SMS 510 Substation Monitoring System;
• CAP 505 Relay Product Engineering SMS 510 v. 1.0.0-3, or later
Tools; CAP 505 v. 2.1.1, or later

References Additional information

Other available manuals:

Technical Reference Manual REJ 525 1MRS 750941-MUM
Operator’s Manual REJ 525 1MRS 752137-MUM
Installation Manual RE_5__ 1MRS 750526-MUM
ABB Oy
Substation Automation
P.O. Box 699
FIN-65101 Vaasa, Finland
Tel +358 10 22 11
Fax +358 10 224 1094
www.abb.com/substationautomation