GE C60 Instruction Manual page 531

CHAPTER 8: THEORY OF OPERATION
Table 8-8: Unblocking scheme trip table for one-bit channels
Remote data
Bit pattern received
RX1 LOG1
0 or 1 1
0 or 1 1
0 or 1 1
0 or 1 1
The scheme initiates a three-phase trip if the phase selector fails to recognize the fault type or after the
operand is asserted.
8.2.3.3 Two-bit channels
The TX1, TX2, RX1, and RX2 operands are used and fault data is coded per the following tables.
Table 8-9: Permissive scheme transmit codes for two-bit channels
Phase selector determination of
fault type
AG, BC, BCG
BG, CA, CAG
CG, AB, ABG, 3P, Unrecognized
Table 8-10: Blocking scheme transmit codes for two-bit channels
Phase selector Bit pattern transmitted
determination of fault
TX1
type
AG, BC, BCG 0
BG, CA, CAG 1
CG, AB, ABG, 3P 0
CG, AB, ABG, 3P, 0
Unrecognized
Table 8-11: 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 8-12: Permissive scheme trip table for two-bit channels
Remote data
Bit pattern received
RX1 RX2
1 0
0 1
1 1
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
Local data
Remote Local determination of fault type
determination of
fault type
Any AG Fault
Any BG Fault
Any CG Fault
Any AB, ABG, BC, BCG, CA, CAG, 3P,
Unrecognized
Bit pattern transmitted
TX1 TX2
1 0
0 1
1 1
TX2
1
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
Trip output
DCUB Trip A
DCUB Trip B
DCUB Trip C
DCUB Trip 3P
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
SINGLE-POLE TRIPPING
AR FORCE 3P TRIP
8-11
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