GE P742

Operation
P74x/EN OP/N
a7
MiCOM P741, P742, P743
(OP) 5-
23
OP
Other
Protection
P3758ENa
BB1
Trip Order (1)
PU
50BF
PU
50BF
CU 87BB
PU
50BF
CB
Failed
(2)
Main Trip
or Retrip
Back
T
rip
CB Fail signal (3)
Back
T
rip Order (4)
BB2
FIGURE 11: CIRCUIT BREAKER FAILURE LOGIC
FIGURE 12: EXAMPLES