GE D90 Plus Instruction Manual page 673

CHAPTER 15: THEORY OF OPERATION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Table 44: Blocking scheme trip table for four-bit channels
Remote data
Bit pattern
RX1 RX2 RX3 RX4
0 0 0 0
1 1 1 0
1 0 1 1
1 1 0 1
0 1 1 1
1 0 1 1
0 1 1 1
1 1 0 1
1 1 1 0
1 1 0 1
0 1 1 1
1 0 1 1
1 1 1 0
0 1 1 1
1 0 1 1
1 1 0 1
1 1 1 0
Table 45: Unblocking scheme trip table for four-bit channels
Remote data
Bit pattern
RX LO RX LO RX LO
1 G1 2 G2 3 G3
0 0 0 0 0 0
0 0 0 0 0 0
0 0 1 1 0 0
0 0 0 1 0 0
0 0 0 0 1 1
0 0 0 0 0 1
1 1 0 0 0 0
0 1 0 0 0 0
0 0 1 1 0 0
Local data
Remote Local determination
determination of of fault type
fault type
Any while the INIT ---
signal was not
established
MULTI-P AG
BG AG
CG AG
AG AG, AB, ABG, CA, CAG,
3P, Unrecognized
BG BG, AB, ABG, BC, BCG,
3P, Unrecognized
AG BG
CG BG
MULTI-P BG
CG CG, BC, BCG, CA, CAG,
3P, Unrecognized
AG CG
BG CG
MULTI-P CG
AG BC, BCG
BG CA, CAG
CG AB, ABG
MULTI-P Unrecognized
Remote
determination of
RX LO
fault type
4 G4
1 1 MULTI-P
0 1 MULTI-P
0 0 BG
0 0 BG
0 0 CG
0 0 CG
0 0 AG
0 0 AG
0 0 BG
SINGLE-POLE TRIPPING
Trip output
Trip as for single-
bit channel
DIR BLOCK TRIP A
DIR BLOCK TRIP A
DIR BLOCK TRIP A
DIR BLOCK TRIP A
DIR BLOCK TRIP B
DIR BLOCK TRIP B
DIR BLOCK TRIP B
DIR BLOCK TRIP B
DIR BLOCK TRIP C
DIR BLOCK TRIP C
DIR BLOCK TRIP C
DIR BLOCK TRIP C
DIR BLOCK TRIP
3P
DIR BLOCK TRIP
3P
DIR BLOCK TRIP
3P
DIR BLOCK TRIP
3P
Local data
Local Trip output
determination of
fault type
AG DCUB TRIP A
AG DCUB TRIP A
AG DCUB TRIP A
AG DCUB TRIP A
AG DCUB TRIP A
AG DCUB TRIP A
AG, AB, ABG, CA, DCUB TRIP A
CAG, 3P,
unrecognized
AG, AB, ABG, CA, DCUB TRIP A
CAG, 3P,
unrecognized
AG, AB, ABG, CA, DCUB TRIP B
CAG, 3P,
unrecognized
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