658 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
SINGLE-POLE TRIPPING CHAPTER 15: THEORY OF OPERATION
Single-bit channels
Single-bit communication channels for pilot-aided schemes use the RX1 and TX1 operands
for each scheme. The tables show how fault data is coded.
Table 28: Permissive scheme transmit codes for single-bit channels
Table 29: Blocking scheme transmit codes for single-bit channels
Table 30: Unblocking scheme transmit codes for single-bit channels
Table 31: Permissive scheme trip table for single-bit channels
Table 32: Blocking scheme trip table for single-bit channels
Phase selector determination of fault type Bit pattern
TX1
AG, BG, CG, ABG, BCG, CAG, AB, BC, CA, and 3P 1
Unrecognized or AR FORCE 3P TRIP 1
None of the above 0
Phase selector determination of fault type Bit pattern
TX1
AG, BG, CG, ABG, BCG, CAG, AB, BC, CA, and 3P 0
Unrecognized or AR FORCE 3P TRIP 0
None of the above 1
Phase selector determination of fault type Bit pattern
TX1
AG, BG, CG, ABG, BCG, CAG, AB, BC, CA, and 3P 1
Unrecognized or AR FORCE 3P TRIP 1
None of the above 0
Remote data Local data
Bit pattern Remote determination
of fault type
Local determination of fault type Trip output
RX1
1 Any AG fault TRIP PHASE A
1 Any BG fault TRIP PHASE B
1 Any CG fault TRIP PHASE C
1 Any ABG, BCG, CAG, AB, BC, CA, or 3P fault,
or unrecognized
TRIP 3-POLE
Remote data Local data
Bit pattern 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 ABG, BCG, CAG, AB, BC, CA, or 3P fault,
or unrecognized
TRIP 3-POLE
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