GE UR Series L90 Instruction Manual page 589

9 THEORY OF OPERATION
Table 9–24: BLOCKING SCHEME TRANSMIT CODES FOR 4-BIT CHANNELS
PHASE SELECTOR
DETERMINATION OF FAULT
TYPE
AG
BG
CG
AB, ABG, BC, BCG, CA, CAG,
3P, Unrecognized
Table 9–25: UNBLOCKING SCHEME TRANSMIT CODES FOR 4-BIT CHANNELS
PHASE SELECTOR
DETERMINATION OF FAULT TYPE
AG
BG
CG
AB, ABG, BC, BCG, CA, CAG, 3P,
Unrecognized
The action output is generated per the following tables.
Table 9–26: PERMISSIVE SCHEME TRIP TABLE FOR 4-BIT CHANNELS
REMOTE DATA
BIT PATTERN RECEIVED
RX1 RX2 RX3
0 0 0
0 1 0
0 0 1
1 0 0
0 1 0
1 0 0
0 0 1
0 0 0
0 0 1
1 0 0
0 1 0
0 0 0
1 0 0
0 1 0
0 0 1
0 0 0
GE Multilin
BIT PATTERN TRANSMITTED
TX1 TX2 TX3
0 1 1
1 0 1
1 1 0
1 1 1
BIT PATTERN TRANSMITTED
TX1 TX2
1 0
0 1
0 0
0 0
REMOTE
DETERMINATION OF
RX4
FAULT TYPE
1 MULTI-P
0 BG
0 CG
0 AG
0 BG
0 AG
0 CG
1 MULTI-P
0 CG
0 AG
0 BG
1 MULTI-P
0 AG
0 BG
0 CG
1 MULTI-P
L90 Line Current Differential System
9.5 SINGLE-POLE TRIPPING
FLEXLOGIC™ OPRERANDS ASSERTED
TX4 TX1 STOP TX2 STOP TX3 STOP TX4 STOP
1 1 0
1 0 1
1 0 0
0 0 0
TX3 TX4
0 0
0 0
1 0
0 1
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
0 0
0 0
1 0
0 1
TRIP OUTPUT
Trip Phase A
Trip Phase B
Trip Phase C
Trip Three Phases
9
9-43