GE L90 Instruction Manual page 569

9 THEORY OF OPERATION
Table 9–28: UNBLOCKING SCHEME TRIP TABLE FOR FOUR-BIT CHANNELS
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
0 0 1 1
0 0 0 1
1 1 0 0
0 1 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 1 0 0
0 1 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
0 0 1 1
0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
GE Multilin
REMOTE DATA
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
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 1 0 0
0 1 0 0
0 0 1 1
0 0 0 1
1 1 0 0
0 1 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 1 1
0 0 0 1
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 1 0 0
0 1 0 0
0 0 1 1
0 0 0 1
L90 Line Current Differential System
9.5 SINGLE-POLE TRIPPING
REMOTE LOCAL
DETERMINATION DETERMINATION OF
OF FAULT TYPE FAULT TYPE
MULTI-P
BG
CG
AG AG, AB, ABG, CA,
CAG, 3P, unrecognized
BG AG, AB, ABG, CA,
CAG, 3P, unrecognized
AG
CG
MULTI-P
CG CG, BC, BCG, CA,
CAG, 3P, unrecognized
AG
BG
MULTI-P
AG BC, BCG
BG CA, CAG
CG AB, ABG
MULTI-P 3P or unrecognized
LOCAL DATA
TRIP OUTPUT
AG DCUB TRIP A
DCUB TRIP B
BG
DCUB TRIP C
CG
DCUB TRIP 3P
9-45
9