ABB REJ 525 - Testing of the Overcurrent Measuring Transformers; Testing of the Overcurrent Stages

1MRS 752137-MUM
Combined Overcurrent and Earth-Fault Relay
Operator’s Manual
REJ 525
29
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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.
5.3.1. Testing of the overcurrent measuring transformers
Test each used current transformer input separately. Apply a pure sinusoidal voltage
to the relay and compare the current value indicated on the display of the relay with
that shown by the ammeter. The measurements can be made at the rated current of
the relay, for instance. Note that the relay shows the measured current as a multiple
of the rated current, I
n
, of the energizing input used.
5.3.2. Testing of the overcurrent stages
The test is carried out as a single-phase test.
Before the test is started:
• Record the currently used SGR settings for later restoring.
• Check that stage
∆I is inhibited.
• Set the relay switchgroups as follows:
The setting values can be those currently in use.
L1
PC
4
4
x
4
4
4
x
3
3
3
3
3
2
2
2
2
2
2
1
x
1
1
1
1
1 A 5 A 1 A 5 A 1 A 5 A
Test525
PO1PO2
+ +
IRF
+
+ -
3I>
3I>>
1MKC950001-1
~
Io>
5 6
3 4
13 14 15
1 2
17 18
1 2 3 4 5 6 7 8 9 10 11 12
5
6
10 11 12
7 8 9
SO1SO2
X1.1
X2.1
L1
L2
L3
+ (~)
- (~)
S2
S1
N
A
SGR1
SGR2
SGR3
SGR4
SGB1
SGB1
BI
I/O
1
2
SGB1
SGB1
3
SGB1
4
SGB1
Io>>
8
SGB1
7
SGB1
1
SGB2
SGR7
SGR8
4
3
3
2
1
1
DI>
SGR9
SGR10
SGR5
SGR6
4
4
3
3
2
2
1
1
Serial port
* REJ525B 415BAA: 2 = 5 A
3 = 1 A
REJ525B 412BAA: 2 = 1 A
3 = 0.2 A
*
Optical PC-interface
INDICATIONS CLEARED
INDIC. CLEARED AND
OUTP. CONT. UNLATCHED
MEMORIZED VALUES AND
INDIC. CLEARED; OUTPUT
CONTACTS UNLATCHED
Blocking of stage Io>>
Blocking of stage DI>
Blocking of stage I>>
Blocking of stage I>
TIMER START
TIMER STOP
U
aux
IRF
START
TRIP
START
TRIP
START
TRIP
START
TRIP
SWITCHGROUP SELECTION
Blocking of stage Io>
START
TRIP
See text!
Table 5.3.2-1 Switchgroup settings
Setting SGR
I> to SO1 SGR1=4
t> to PO1 SGR2=1
I>> to SO2 SGR3=8
t>> to PO2 SGR4=2
∆I> SGR9=0
t∆>SGR10=0