GE D60 - Page 577

GE Multilin D60 Line Distance Protection System 8-27
8 THEORY OF OPERATION 8.5 SINGLE-POLE TRIPPING
8
The scheme initiates a three-phase trip if the phase selector fails to recognize the fault type or after the AR FORCE 3P
TRIP operand is asserted.
c) TWO-BIT CHANNELS
The TX1, TX2, RX1 and RX2 operands are used and fault data is coded per the following tables.
Table 8–14: PERMISSIVE SCHEME TRIP TABLE FOR 1-BIT CHANNELS
REMOTE DATA LOCAL DATA
BIT PATTERN RECEIVED REMOTE DETERMINATION
OF FAULT TYPE
LOCAL DETERMINATION OF
FAULT TYPE
TRIP OUTPUT
RX1
1 Any AG Fault Trip Phase A (A+N/G)
1 Any BG Fault Trip Phase B (B+N/G)
1 Any CG Fault Trip Phase C (C+N/G)
1 Any AB, ABG, BC, BCG, CA, CAG,
3P, Unrecognized
Trip Three Phases (per local
selection, unrecognized and
3P=A+B+C+N/G)
Table 8–15: BLOCKING SCHEME TRIP TABLE FOR 1-BIT CHANNELS
REMOTE DATA LOCAL DATA
BIT PATTERN RECEIVED REMOTE DETERMINATION
OF FAULT TYPE
LOCAL DETERMINATION OF
FAULT TYPE
TRIP OUTPUT
RX1
0 Any AG Fault Trip Phase A
0 Any BG Fault Trip Phase B
0 Any CG Fault Trip Phase C
0 Any AB, ABG, BC, BCG, CA, CAG,
3P, Unrecognized
Trip Three Phases
Table 8–16: UNBLOCKING SCHEME TRIP TABLE FOR 1-BIT CHANNELS
REMOTE DATA LOCAL DATA
BIT PATTERN RECEIVED REMOTE DETERMINATION
OF FAULT TYPE
LOCAL DETERMINATION OF
FAULT TYPE
TRIP OUTPUT
RX1 LOG1
0 or 1 1 Any AG Fault DCUB TRIP A
0 or 1 1 Any BG Fault DCUB TRIP B
0 or 1 1 Any CG Fault DCUB TRIP C
0 or 1 1 Any AB, ABG, BC, BCG, CA, CAG,
3P, Unrecognized
DCUB TRIP 3P
Table 8–17: PERMISSIVE SCHEME TRANSMIT CODES FOR 2-BIT CHANNELS
PHASE SELECTOR DETERMINATION
OF FAULT TYPE
BIT PATTERN TRANSMITTED
TX1 TX2
AG, BC, BCG 1 0
BG, CA, CAG 0 1
CG, AB, ABG, 3P, Unrecognized 1 1
Table 8–18: BLOCKING SCHEME TRANSMIT CODES FOR 2-BIT CHANNELS
PHASE SELECTOR DETERMINATION
OF FAULT TYPE
BIT PATTERN TRANSMITTED FLEXLOGIC™ OPERANDS
ASSERTED
TX1 TX2 TX1 STOP TX2 STOP
AG, BC, BCG 0110