GE D60 - Page 579

GE Multilin D60 Line Distance Protection System 8-29
8 THEORY OF OPERATION 8.5 SINGLE-POLE TRIPPING
8
d) FOUR-BIT CHANNELS
The TX1, TX2, TX3, TX4, RX1, RX2, RX3 and RX4 operands are used.
0 0 CG, AB, ABG, 3P, Unrecognized AB, ABG, 3P, Unrecognized DIR BLOCK TRIP 3P
0 1 AG, BC, BCG BC, BCG Unrecognized
1 0 BG, CA, CAG CA, CAG Unrecognized
Table 8–22: UNBLOCKING SCHEME TRIP TABLE FOR 2-BIT CHANNELS
REMOTE DATA LOCAL DATA
BIT PATTERN RECEIVED REMOTE DETERMINATION OF
FAULT TYPE
LOCAL DETERMINATION
OF FAULT TYPE
TRIP OUTPUT
RX1LOG1RX2LOG2
1100 AG, BC, BCG AG, AB, ABG CA, CAG, 3P DCUB TRIP A
0100
0011 BG, CA, CAG AG
0001
1111CG, AB, ABG, 3P, unrecognized AG
0111
1101
0101
0011 BG, CA, CAG BG, AB, ABG BC, BCG, 3P DCUB TRIP B
0001
1111CG, AB, ABG, 3P, unrecognized BG
0111
1101
0101
1100 AG, BC, BCG BG
0100
1100 AG, BC, BCG CG DCUB TRIP C
0100
0011 BG, CA, CAG CG
0001
1111CG, AB, ABG, 3P, unrecognizedCG, BC, BCG, CA, CAG
0111
1101
0101
1100 AG, BC, BCG BC, BCG, unrecognized DCUB TRIP 3P
0100
0011 BG, CA, CAG CA, CAG, unrecognized
0001
1111CG, AB, ABG, 3P, unrecognizedAB, ABG, 3P, unrecognized
0111
1101
0101
Table 8–21: BLOCKING SCHEME TRIP TABLE FOR 2-BIT CHANNELS
REMOTE DATA LOCAL DATA
BIT PATTERN RECEIVED REMOTE DETERMINATION OF FAULT
TYPE
LOCAL DETERMINATION
OF FAULT TYPE
TRIP OUTPUT
RX1 RX2