GE L90 Instruction Manual page 787

CHAPTER 10: THEORY OF OPERATION
Remote data
Bit pattern received
RX1 RX2
0 0
0 1
1 0
Table 10-25: Unblocking scheme trip table for two-bit channels
Remote data
Bit pattern received
RX1 LOG1 RX2
1 1 0
0 1 0
0 0 1
0 0 0
1 1 1
0 1 1
1 1 0
0 1 0
0 0 1
0 0 0
1 1 1
0 1 1
1 1 0
0 1 0
1 1 0
0 1 0
1 1 0
0 1 0
0 0 1
0 0 0
1 1 1
0 1 1
1 1 0
0 1 0
1 1 0
0 1 0
0 0 1
0 0 0
1 1 1
0 1 1
1 1 0
0 1 0
10.5.3.4 Four-bit channels
The TX1, TX2, TX3, TX4, RX1, RX2, RX3, and RX4 operands are used.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Remote determination of fault
type
CG, AB, ABG, 3P, Unrecognized
AG, BC, BCG
BG, CA, CAG
Remote determination
of fault type
LOG2
0 AG, BC, BCG
0
1 BG, CA, CAG
1
1 CG, AB, ABG, 3P,
unrecognized
1
1
1
1 BG, CA, CAG
1
1 CG, AB, ABG, 3P,
unrecognized
1
1
1
0 AG, BC, BCG
0
0 AG, BC, BCG
0
1 BG, CA, CAG
1
1 CG, AB, ABG, 3P,
unrecognized
1
1
1
0 AG, BC, BCG
0
1 BG, CA, CAG
1
1 CG, AB, ABG, 3P,
unrecognized
1
1
1
Local data
Local determination of fault Trip output
type
AB, ABG, 3P, Unrecognized DIR BLOCK TRIP 3P
BC, BCG Unrecognized
CA, CAG Unrecognized
Local data
Local determination of
fault type
AG, AB, ABG CA, CAG, 3P
AG
AG
BG, AB, ABG BC, BCG, 3P
BG
BG
CG
CG
CG, BC, BCG, CA, CAG
BC, BCG, unrecognized
CA, CAG, unrecognized
AB, ABG, 3P, unrecognized
SINGLE-POLE TRIPPING
Trip output
DCUB TRIP A
DCUB TRIP B
DCUB TRIP C
DCUB TRIP 3P
10
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