GE L90

10-44 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
SINGLE-POLE TRIPPING CHAPTER 10: THEORY OF OPERATION
10
Table 10-21: Blocking scheme transmit codes for two-bit channels
Table 10-22: Unblocking scheme transmit codes for two-bit channels
The action output is generated per the following tables.
Table 10-23: Permissive scheme trip table for two-bit channels
Table 10-24: Blocking scheme trip table for two-bit channels
Phase selector
determination of fault
type
Bit pattern transmitted FlexLogic operands asserted
TX1 TX2 TX1 STOP TX2 STOP
AG, BC, BCG 0 1 1 0
BG, CA, CAG 1 0 0 1
CG, AB, ABG, 3P 0 0 1 1
CG, AB, ABG, 3P,
Unrecognized
0011
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
Remote data Local data
Bit pattern received Remote determination of fault
type
Local determination of fault
type
Trip output
RX1 RX2
1 0 AG, BC, BCG AG, AB, ABG CA, CAG, 3P Trip Phase A
0 1 BG, CA, CAG AG
1 1 CG, AB, ABG, 3P, Unrecognized AG
0 1 BG, CA, CAG BG, AB, ABG, BC, BCG, 3P Trip Phase B
1 1 CG, AB, ABG, 3P, Unrecognized BG
1 0 AG, BC, BCG BG
1 1 CG, AB, ABG, 3P, Unrecognized CG, BC, BCG, CA, CAG Trip Phase C
1 0 AG, BC, BCG CG
0 1 BG, CA, CAG CG
1 1 CG, AB, ABG, 3P, Unrecognized AB, ABG, 3P, Unrecognized Trip Three Phases
1 0 AG, BC, BCG BC, BCG, Unrecognized
0 1 BG, CA, CAG CA, CAG, Unrecognized
Remote data Local data
Bit pattern received Remote determination of fault
type
Local determination of fault
type
Trip output
RX1 RX2
0 1 AG, BC, BCG AG, AB, ABG CA, CAG, 3P DIR BLOCK TRIP A
1 0 BG, CA, CAG AG
0 0 CG, AB, ABG, 3P, Unrecognized AG
1 0 BG, CA, CAG BG, AB, ABG, BC, BCG, 3P DIR BLOCK TRIP B
0 0 CG, AB, ABG, 3P, Unrecognized BG
0 1 AG, BC, BCG BG
0 0 CG, AB, ABG, 3P, Unrecognized CG, BC, BCG, CA, CAG DIR BLOCK TRIP C
0 1 AG, BC, BCG CG
1 0 BG, CA, CAG CG