GE L90 Instruction Manual page 722

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