ABB REJ 521 - Page 28

28
1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
To enable secondary testing, the relay has to be disconnected, either by
disconnecting the terminal blocks or by fitting a test plug on the relay.
Equipment required for testing:
• adjustable voltage transformer 0...260 V, 1 A
• current transformer
• ammeter, accuracy ±0.5%
• stop watch or counter for time measurement
• ac/dc voltage source for the auxiliary supply
• switches and indicator lamps
• supply and pilot wires
• calibrated multimeter
The secondary current is to be selected on the basis of the rated current, 0.2 A, 1 A
or 5 A, of the relay energizing input.
1RWH
For the limited current carrying capacity of the wiring, terminals and measuring
transformers of the relay, refer to section Technical data in the Technical Reference
Manual.
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When the test circuit has been completed and the switchgroups have been set, the
auxiliary voltage may be connected to the relay. The operation of the test circuit can
be verified using a multimeter.
Danger!
Do not open the secondary circuit of a current transformer during any phase of
the testing when the primary circuit is live. The high voltage generated by an
open CT secondary circuit may be lethal and damage instruments and
insulation.
L1
PC
4
4
x
4
x
3
3
3
2
2
2
2
1
x
1
1
0.2 A 1 A
Test521
PO1PO2
+ +
IRF
+
+ -
1MKC950001-1
~
5 6
3 4
13 14 15
1 2
17 18
1 2 3 4 5 6
10 11 12
7 8 9
SO1SO2
X1.1
X2.1
L1
L2
L3
+ (~)
- (~)
S2
S1
N
A
SGR1
SGR2
SGR3
SGR4
Io>
Io>>
1
2
3
SGB1
SGB1
SGB1
U
aux
BI
5
SGB1
6
SGB1
4
SGB1
Optical
PC-interface
TIMER START
TIMER STOP
Blocking of stage Io>
See text!
Blocking of stage Io>>
Serial
port
INDICATIONS CLEARED
OUTP. CONT. UNLATCHED
AND INDIC. CLEARED
MEMORIZED VALUES AND
INDIC. CLEARED; OUTPUT
CONTACTS UNLATCHED
I/O
IRF
START
TRIP
START
TRIP
SWITCHGROUP SELECTION