GE L90 Instruction Manual page 725

CHAPTER 10: THEORY OF OPERATION
Remote data
Bit pattern received
RX1 RX2 RX3
1 0 0
0 1 0
0 0 1
0 0 0
Table 10-30: Blocking scheme trip table for four-bit channels
Remote data
Bit pattern received
RX1 RX2 RX3
0 0 0
1 1 1
1 0 1
1 1 0
0 1 1
1 0 1
0 1 1
1 1 0
1 1 1
1 1 0
0 1 1
1 0 1
1 1 1
0 1 1
1 0 1
1 1 0
1 1 1
Table 10-31: Unblocking scheme trip table for four-bit channels
Remote data
Bit pattern received
RX1 LOG1 RX2 LOG2
0 0 0 0
0 0 0 0
0 0 1 1
0 0 0 1
0 0 0 0
0 0 0 0
1 1 0 0
0 1 0 0
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Remote
determination of
RX4
fault type
0 AG
0 BG
0 CG
1 MULTI-P
Remote determination of
fault type
RX4
0 Any while the INIT signal
was not established
0 MULTI-P
1 BG
1 CG
1 AG
1 BG
1 AG
1 CG
0 MULTI-P
1 CG
1 AG
1 BG
0 MULTI-P
1 AG
1 BG
1 CG
0 MULTI-P
RX3 LOG3 RX4 LOG4
0 0 1 1
0 0 0 1
0 0 0 0
0 0 0 0
1 1 0 0
0 1 0 0
0 0 0 0
0 0 0 0
Local data
Local determination of fault
type
BC, BCG
CA, CAG
AB, ABG
Unrecognized
Local data
Local determination of fault
type
AG
AG
AG
AG, AB, ABG, CA, CAG, 3P,
Unrecognized
BG, AB, ABG, BC, BCG, 3P,
Unrecognized
BG
BG
BG
CG, BC, BCG, CA, CAG, 3P,
Unrecognized
CG
CG
CG
BC, BCG
CA, CAG
AB, ABG
Unrecognized
Local data
Remote Local determination
determinatio of fault type
n of fault
type
MULTI-P AG
BG
CG
AG AG, AB, ABG, CA, CAG,
3P, unrecognized
SINGLE-POLE TRIPPING
Trip output
Trip Three Phases
Trip output
Trip as for single-bit
channel
DIR BLOCK TRIP A
DIR BLOCK TRIP B
DIR BLOCK TRIP C
DIR BLOCK TRIP 3P
Trip output
DCUB TRIP A
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