GE UR Series L90, Instruction Manual

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9-42 L90 Line Current Differential System GE Multilin
9.5 SINGLE-POLE TRIPPING 9 THEORY OF OPERATION
9
d) FOUR-BIT CHANNELS
The TX1, TX2, TX3, TX4, RX1, RX2, RX3 and RX4 operands are used.
Table 9–22: 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
RX1 LOG1 RX2 LOG2
1 1 0 0 AG, BC, BCG AG, AB, ABG CA, CAG, 3P DCUB TRIP A
0 1 0 0
0 0 1 1 BG, CA, CAG AG
0 0 0 1
1 1 1 1 CG, AB, ABG, 3P, unrecognized AG
0 1 1 1
1 1 0 1
0 1 0 1
0 0 1 1 BG, CA, CAG BG, AB, ABG BC, BCG, 3P DCUB TRIP B
0 0 0 1
1 1 1 1 CG, AB, ABG, 3P, unrecognized BG
0 1 1 1
1 1 0 1
0 1 0 1
1 1 0 0 AG, BC, BCG BG
0 1 0 0
1 1 0 0 AG, BC, BCG CG DCUB TRIP C
0 1 0 0
0 0 1 1 BG, CA, CAG CG
0 0 0 1
1 1 1 1 CG, AB, ABG, 3P, unrecognized CG, BC, BCG, CA, CAG
0 1 1 1
1 1 0 1
0 1 0 1
1 1 0 0 AG, BC, BCG BC, BCG, unrecognized DCUB TRIP 3P
0 1 0 0
0 0 1 1 BG, CA, CAG CA, CAG, unrecognized
0 0 0 1
1 1 1 1 CG, AB, ABG, 3P, unrecognized AB, ABG, 3P, unrecognized
0 1 1 1
1 1 0 1
0 1 0 1
Table 9–23: PERMISSIVE SCHEME TRANSMIT CODES FOR 4-BIT CHANNELS
PHASE SELECTOR
DETERMINATION OF FAULT TYPE
BIT PATTERN TRANSMITTED
TX1 TX2 TX3 TX4
AG 1 0 0 0
BG 0 1 0 0
CG 0 0 1 0
AB, ABG, BC, BCG, CA, CAG, 3P,
Unrecognized
0 0 0 1