ABB REU 523 User manual

1
1MRS 751123-MBG
Issued: 15.06.1999
Status: Updated
Version: B/23.11.2001
Data subject to change without notice
REU 523
Combined overvoltage and undervoltage
relay
Features • Over and undervoltage protection
• Single- or three-phase use
• High-set overvoltage stage with definite-
time or inverse definite minimum time
(IDMT) characteristic
• Low-set overvoltage stage with definite-
time or IDMT characteristic
• High-set undervoltage stage with definite-
time or IDMT characteristic
• Low-set undervoltage stage with definite-
time or IDMT characteristic
• Positive-phase-sequence protection
• Adjustable drop-off/pick-up ratio for the
low-set stages
• Circuit-breaker failure protection (CBFP)
• Disturbance recording up to 12 seconds
- triggering by a start or a trip signal from
any protection stage and/or by a binary
input signal
- records three analogue channels and
eight digital channels
- adjustable sampling rate
• Non-volatile memory for
- up to 60 event codes
- setting values
- disturbance recorder data
- 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
• Three accurate voltage inputs
• Galvanically isolated binary input with a
wide input voltage range
• All settings can be modified with a personal
computer
• HMI with an alphanumeric LCD and
manoeuvring buttons
• IEC 60870-5-103 and SPA bus communi-
cation protocols
• Two normally open power output contacts
• Two change-over signal output contacts
• Output contact functions freely configura-
ble for desired operation
• Optical PC-connector for two-way data
communication (front)
• RS-485 connector (rear) for system com-
munication
• Continuous self-supervision of electronics
and software. At an internal relay fault, all
stages and outputs are blocked
• User-selectable rated frequency 50/60 Hz
• User-selectable nominal voltage 100/110/
115/120 V
• User-selectable password protection for
the HMI
• Display of primary voltage values
• Demand values
• Multi-language support

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
2
Application The over and undervoltage relay REU 523 is
a secondary relay which is connected to the
voltage transformers of the object to be pro-
tected. The over and the undervoltage unit
continuously measure the fundamental wave
of the phase-to-phase voltages of the object.
On detection of a fault, the relay will start,
trip the circuit breaker, provide alarms, record
fault data etc., in accordance with the applica-
tion and the configured relay functions.
The overvoltage unit includes low-set stage
U> and high-set stage U>> and the undervolt-
age unit low-set stage U< and high-set stage
U<<. The high-set undervoltage stage can
alternatively be set to evaluate the positive-
phase-sequence voltage. In addition, the high-
set undervoltage stage can be configured to
evaluate only one instead of three phase-to-
phase voltages.
The protection functions are independent of
each other and have their own setting groups
and data recordings. The over and undervolt-
age functions use conventional voltage trans-
former measurement.
An output contact matrix allows start or trip
signals from the protection stages to be
routed to the desired output contact.
Design The relay includes: a high-set and low-set
overvoltage unit, a high-set and low-set und-
ervoltage unit and a circuit-breaker failure
protection unit. Further, the relay includes an
HMI module, a self-supervision system and a
disturbance recorder.
Overvoltage unit
When the voltage values exceed the set start
value of low-set stage U>, the overvoltage
unit will start to deliver a start signal after a ~
60 ms’ start time. When the set operate time
at definite-time characteristic or the calcu-
lated operate time at inverse definite mini-
mum time (IDMT) characteristic elapses, the
overvoltage unit will deliver a trip signal.
When the voltage values exceed the set start
value of high-set stage U>>, the overvoltage
unit will start to deliver a start signal after a ~
50 ms’ start time. When the set operate time
at definite-time characteristic or the calcu-
lated operate time at IDMT characteristic
elapses, the overvoltage unit will deliver a
trip signal.
The low-set and the high-set stage of the
overvoltage unit may be assigned either a def-
inite-time or an IDMT characteristic. When
the IDMT characteristic is chosen, two
time/voltage curve groups, A and B, are
available.
It is possible to block the start and the trip-
ping of an overvoltage stage by applying an
external binary input signal to the relay.
High-set stage U>> can be set out of opera-
tion. This state will be indicated by three
dashes “---” on the LCD and by “999” when
the set start current value is read via serial
communication.
Undervoltage unit
When the voltage values fall below the set
start value of low-set stage U<, the undervolt-
age unit will start to deliver a start signal after
a ~ 80 ms’ start time. When the set operate
time at definite-time characteristic or the cal-
culated operate time at IDMT characteristic
elapses, the undervoltage unit will deliver a
trip signal.
The high-set undervoltage stage can be set to
start and trip either based on conventional
undervoltage measurement or on the calcu-
lated positive-phase-sequence voltage, U1s.
Selecting either of these two will automati-
cally deseclect the other.
When the conventional protection mode is
selected for the high-set undervoltage stage
and the voltage values fall below the set start
value of high-set stage U<<, the undervoltage
unit will start to deliver a start signal after a
~50 ms’ start time.
When the positive-phase-sequence protec-
tion mode is selected for the high-set under-
voltage stage and the calculated positive-
phase-sequence voltage value, U1s, falls
below the set start value of high-set stage
U<<, the undervoltage unit will start to
deliver a start signal after a ~50 ms’ start
time. When the set operate time at definite-
time characteristic or the calculated operate
time at IDMT characteristic elapses, the und-
ervoltage unit will deliver a trip signal.
The low-set and the high-set stage of the und-
ervoltage unit may be assigned either a defi-
nite-time or an IDMT characteristic. When
the IDMT characteristic is chosen, one
time/voltage curve group, C, is available.

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
3
The start and the tripping of the undervoltage
stages can be set to be internally blocked
when the measured value falls below 0.2 x
Un. This function is selected in switchgroup
SGF. In addition, the tripping of stage U< can
be set to be blocked by the start of stage U<<.
The selection is made with a switch in one of
the software switchgroups. The start and the
tripping of an undervoltage stage can also be
blocked by applying an external binary input
signal to the relay.
High-set stage U<< can be set out of opera-
tion. This state will be indicated by three
dashes “---” on the LCD and by “999” when
the set start value is read via serial communi-
cation.
Circuit breaker failure
protection (CBFP) unit
The CBFP unit will generate a trip signal via
power output 2 (PO2) if the fault has not been
cleared on expiration of the set operate time
0.10 s...1.00 s
Normally, the CBFP unit controls the up-
stream circuit breaker. It can also be used for
tripping via redundant trip circuits of the
same circuit breaker provided that the circuit
breaker has two trip coils. The circuit breaker
failure protection unit is activated via a soft-
ware switch.
Disturbance recorder
The REU 523 includes an internal distur-
bance recorder which records the momentary
measured values, or the RMS curves of the
measured signals, and up to eight user-select-
able binary signals: the external binary input
signal and the states of the internal protection
stages. The disturbance recorder can be set to
be triggered by a start or a trip signal from
any protection stage and/or by an external
binary input signal, and either on the falling
or rising trigger edge. The ratio of the pre-
and post-triggering of the recording can be
set.
The recording length varies according to the
selected sampling frequency. The RMS curve
is recorded by selecting the sampling fre-
quency to be the same as the nominal fre-
quency of the relay. See the table below for
details:
HMI module
The HMI of the REU 523 is equipped with
six push-buttons and an alphanumeric 2 x 16
character LCD. The push-buttons are used for
navigating in the menu structure and for
adjusting set values.
An HMI password can be set to protect all
user-changeable values from being changed
by an unauthorised person.
The REU 523 offers you multi-language sup-
port. The following languages are available
for HMI menu: English, German, French,
Spanish, Italian, Swedish and Finnish.
Self-supervision (IRF)
The REU 523 is provided with an extensive
self-supervision system which continuously
supervises the software and the electronics of
the relay. It handles run-time fault situations
and informs the user about an existing fault
via a LED on the HMI and a text message on
the LCD.
Communication capabilities
The REU 523 can be connected to a substa-
tion automation or monitoring system using
either the SPA bus communication protocol
or the IEC 60870-5-103 remote communica-
tion protocol. Both protocols are supported in
the same device.
The SPA bus communication protocol is an
asynchronous serial communication protocol
(1 start bit, 7 data bits + even parity, and 1
stop bit) with a selectable data transfer rate
(default 9.6 kbps). It is a master/slave proto-
col supporting one master device and several
slave devices. The SPA bus protocol can be
used to transfer data , e.g. measured currents,
registered values, events, and relay settings,
between the master and the slave device.
The REU 523 supports the IEC 60870-5-103
remote communication protocol in the unbal-
anced transmission mode with a data transfer
Nominal
frequency
Hz
Sampling
frequency
Hz
Recording
length s
50 800 0.60
50 400 1.20
50 50 9.60
60 960 1.00
60 480 2.00
60 60 16.00
Nominal
frequency
Hz
Sampling
frequency
Hz
Recording
length s

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
4
rate of 9.6 kbps. The IEC 60870-5-103 proto-
col is used to transfer mesurand and status
data from the slave to the master. Disturbance
recorder data, however, cannot be transferred
using this protocol.
The REU 523 is provided with two serial
communication ports, one on the rear panel
and the other on the front panel.
The REU 523 is interfaced with a fibre-optic
bus by means of the bus connection module
RER 103 via the D9S-type RS-485 connector
on the rear panel of the device. The RER 103
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
normally requires the fibre-optic star coupler
RER 125.
The optical PC-connector on the front panel
is used to connect the relay to the CAP 501/
505 setting and configuration tools. The front
interface uses the SPA bus protocol. The opti-
cal PC-connector galvanically isolates the PC
from the relay. Since this connector is stan-
dardized for ABB relay products, only one
connecting cable (ABB art. No 1MKC-
950001-1) will be required.
The REU 523 can also be connected to the
Lon bus using a LON-SPA Gateway.
Auxiliary Supply
The REU 523 requires a secured auxiliary
voltage supply to operate. The internal power
supply of the relay forms the voltages requir-
ed by the relay electronics. The power supply
is a galvanically isolated (flyback-type)
DC/DC converter. When the auxiliary volt-
age is connected, the green LED on the front
panel will be on.
Input voltage ranges are:
•AC range 80...265 V ac, rated
110/120/220/240 V
•DC range 38...265 V dc, rated
48/60/110/125/220 V
The primary side of the power supply is pro-
tected with a fuse located on the PCB of the
relay. The fuse size is 3.15 A (slow).

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
5
Technical data 7DEOH(QHUJL]LQJLQSXWV
Rated frequency 50/60 Hz ±5 Hz
Rated voltage Un100/110/115/120 V
Maximum input voltage
- continuously 2 x Un
- for 10 s 3 x Un
Power consumption at Un< 0.1 VA (typical 0.03 VA)
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Measured voltages on phases U12, U23 and U31 as
multiples of the rated voltages of the energizing
inputs
0…2 x Un
Measuring accuracy (fn±5 Hz) at 0.20...2.00 x Un±1.5%
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Operating range 18…265 V dc
Rated voltage Ur= 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 5 A
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 L/R < 40 ms, at 48/110/220 V dc 5 A/3 A/1 A
Minimum contact load 100 mA at 24 V ac/dc
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Rated voltage 250 V ac/dc
Continuous carry 5 A
Make and carry for 3.0 s 8 A
Make and carry for 0.5 s 10 A
Breaking capacity when the control circuit time-
constant L/R < 40 ms, at 48/110/220 V dc 1 A/0.25 A/0.15 A
Minimum contact load 100 mA at 24 V ac/dc
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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 panel, optical RS-232 connection for fibre-
optic cable 1MKC 950001-1 SPA bus protocol 4.8 or 9.6 kbps
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Rated voltage Ur =110/120/220/240 V ac
Ur =48/60/110/125/220 V dc
Operating range 80…265 V ac
38…265 V dc
Relay power start-up time, typical 300 ms
Burden of auxiliary supply under
quiescent/operating condition ~ 4 W/~ 10 W
Ripple in the dc auxiliary voltage Max 12% of the dc value

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
6
Interruption time in the auxiliary dc voltage without
resetting < 30 ms at 48 V dc < 100 ms at 110 V dc
< 500 ms at 220 V dc
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Front side IP 54 (flush-mounted)
Rear side, connection terminals IP20
Note!
A rear protective cover (accessory part) can be used to protect and shield the rear of the case.
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Width 111.4 mm
Height, frame 265.9 mm (6U), box 255.8 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 ~3.0 kg
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Specified service temperature range -10...+55 °C
Storage temperature tests -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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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
0HFKDQLFDOWHVWV
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
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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,
IEC 60255-22-2
For contact discharge 6 kV
For air discharge 8 kV

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
7
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
IEC 60255-22-3 (2000)
10 V/m (rms), f = 80…1000 MHz
Radiated, pulse-modulated According to the ENV 50204
IEC 60255-22-3 (2000)
10 V/m, f = 900 MHz
Radiated, test with a portable transmitter According to the IEC 60255-22-3, 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
IEC 61000-4-4
Other terminals 4 kV
Binary input 2 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
IEC 61000-4-8 100 A/m
Voltage dips and short interruptions According to the IEC 61000-4-11
30%/10 ms
60%/100 ms
>95%/5000 ms
Electromagnetic emission tests According to the EN 55011 and EN 50081-2
Conducted, RF-emission
(Mains terminal) EN 55011, class A, IEC 60255-25
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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Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
8
Connection
diagram
Fig. 1 Connection diagram of the combined overvoltage and undervoltage relay
L1
L2
L3
ConD1_U_523
Uaux
1
2
3SGB1
SGB1
SGB1
~
~
X
3
X
3
2
X
2
X
1
X
1
X
X
4
X
4
5 6 3 4
13 14 15
1 2
17 18
1 3 4 6 7 9
SGB1
SGB1
5
6
10 11 12 7 8 9
X2.1
X1.1
100 V 110 V 115 V
3U<
3U<<
SGB1
7
SGB1
8
X
4
X
4
X
3
X
3
2
X
2
X
1
X
1
X
+ -
3U>
3U>>
100 V 110 V 115 V
100 V 110 V 115 V
a
PO1PO2
IRF
BI SO1SO2
IRF
TRIP
SGR1
SGR2
SGR3
SGR4
START
START
TRIP
START
START
TRIP
TRIP
SGR5
SGR6
SGR7
SGR8
A
n
N
PC
Tx
Rx
1MRS090701
RER 103
1MKC950001-1

Combined overvoltage and undervoltage
relay REU 523
1MRS 751123-MBG
9
Ordering The order number identifies the hardware as
described below. This number is labelled on the marking strip on the front panel.
References
TypeReu523
REU523B 409BAA
Analogue interface type
A: Only matching transformers included
Digital input voltage range
A: Digital input voltage range
Ur= 24/48/60/110/220 V dc
Auxiliary voltage range of a power supply module
B: Ur= 110/120/220/240 V ac; 48/60/110/125/220 V dc
Revision
Combined Overvoltage and Undervoltage relay
Hardware number
:KHQRUGHULQJSOHDVHVSHFLI\
Ordering information: Ordering example:
1. Type designation and quantity REU 523, 5 pieces
2. Order number REU523B 409-BAA
3. Optical connection cable 1 piece (1MKC 950001-1)
2UGHUQXPEHUV
Optical connection cable 1MKC 950001-1
Protective cover for rear connectors 1MRS060132
Flush mounting kit 1MRS050209
Semi-flush mounting kit 1MRS050253
Wall mounting kit 1MRS050240
Side-by-side mounting kitl 1MRS050241
19” Rack mounting kit 1MRS050257
Optic bus connection module (RER 103) 1MRS090701
$GGLWLRQDOLQIRUPDWLRQ
Technical Reference Manual 1MRS 750942-MUM
Operator’s Manual 1MRS 751057-MUM
Installation Manual 1MRS 750526-MUM

ABB Oy
P.O. Box 699
FIN-65101 Vaasa, Finland
Tel [phone]
Fax [phone]
www.abb.com/substationautomation