ABB KD-10 Instruction Leaflet page 27

Type KD-10 and KD-11 Compensator Distance Relay
VERIFICATION EXAMPLE USING ASSUMED LOADING OF FIGURE 29
PHASE TO
BE VERIFIED
A
B
C
IDENTIFICATION EXAMPLE USING ASSUMED LOADING OF FIGURE 29
I PHASE
REF
RECEIVING
CURRENT
A
B
C
CORRECT
SWITCHING CONTACT
COMBINATION POSITION
1b
2a
4
2b
3a
5
3b
1a
6
EXAMPLE
OF
SWITCHING CONTACT
COMBINATION POSITION
1b O
2a O
4 C
2b C
3a O
5 C
3b O
1a O
6 O
Table V:
ACTUAL CONTACT POSITION
IF WIRING
IS CORRECT
C C
C C
O O
C C
C C
O O
C C
C C
O O
Table VI:
CURRENT & POLARITY WHICH CAN
PRODUCE OBSERVED CONTACT POSITION
I
REF
–
–
–
+
–
–
–
–
+
EXAMPLE WITH
INCORRECT WIRING
O
O
C
C
O
C
O
O
O
2 aI
a I
REF
REF
– +
+ +
+ –
+ –
+ +
+ –
– +
+ +
– +
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