GE D90 Plus - Page 673

CHAPTER 15: THEORY OF OPERATION SINGLE-POLE TRIPPING
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 663
Table 44: Blocking scheme trip table for four-bit channels
Table 45: Unblocking scheme trip table for four-bit channels
Remote data Local data
Bit pattern Remote
determination of
fault type
Local determination
of fault type
Trip output
RX1 RX2 RX3 RX4
0000Any while the INIT
signal was not
established
--- Trip as for single-
bit channel
1110MULTI-P AG DIR BLOCK TRIP A
1011BG AG DIR BLOCK TRIP A
1101CG AG DIR BLOCK TRIP A
0111AG AG, AB, ABG, CA, CAG,
3P, Unrecognized
DIR BLOCK TRIP A
1011BG BG, AB, ABG, BC, BCG,
3P, Unrecognized
DIR BLOCK TRIP B
0111AG BG DIR BLOCK TRIP B
1101CG BG DIR BLOCK TRIP B
1 1 1 0 MULTI-P BG DIR BLOCK TRIP B
1 1 0 1 CG CG, BC, BCG, CA, CAG,
3P, Unrecognized
DIR BLOCK TRIP C
0111AG CG DIR BLOCK TRIP C
1011BG CG DIR BLOCK TRIP C
1110MULTI-P CG DIR BLOCK TRIP C
0 1 1 1 AG BC, BCG DIR BLOCK TRIP
3P
1011BG CA, CAG DIR BLOCK TRIP
3P
1 1 0 1 CG AB, ABG DIR BLOCK TRIP
3P
1110MULTI-P Unrecognized DIR BLOCK TRIP
3P
Remote data Local data
Bit pattern Remote
determination of
fault type
Local
determination of
fault type
Trip output
RX
1
LO
G1
RX
2
LO
G2
RX
3
LO
G3
RX
4
LO
G4
00000011MULTI-P AG DCUB TRIP A
00000001MULTI-P AG DCUB TRIP A
00110000BG AG DCUB TRIP A
00010000BG AG DCUB TRIP A
00001100CG AG DCUB TRIP A
00000100CG AG DCUB TRIP A
1 1 0 0 0 0 0 0 AG AG, AB, ABG, CA,
CAG, 3P,
unrecognized
DCUB TRIP A
0 1 0 0 0 0 0 0 AG AG, AB, ABG, CA,
CAG, 3P,
unrecognized
DCUB TRIP A
0 0 1 1 0 0 0 0 BG AG, AB, ABG, CA,
CAG, 3P,
unrecognized
DCUB TRIP B