GE Multilin 850

CHAPTER 4: SETPOINTS CONTROL
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–331
Figure 4-148: Breaker Failure logic diagram
894067A2.cdr
SETPOINTS
BF 1 FUNCTION: Alarm Latched Alarm
OR
AND
Re-trip
LED: ALARM /
LATCHED ALARM
Command
AND
S R
LATCH # 1
Set-
Dominant
Configurable
FlexLogic Operands
BF1 Highset OP
SETPOINTS
Do Not Operate, Operate OUTPUT RELAYS
IA > PICKUP IB > PICKUP IC > PICKUP
IB IC
RUN RUN RUN
AND
SETPOINTS
BF1 BLOCK : Off = 0
OR
IA
AND
FlexLogic Operand
BF1 Retrip
Disabled
Operate Output
Relay 1 (TRIP)
LED: TRIP
AND
IN > PICKUP
RUN
SETPOINTS
BF1 PH RETRIP SUPERV PICKUP: BF1 NTRL RETRIP SUPERV PICKUP:
IN
AND
OR
SETPOINT
BF1 BREAKER CLOSED: Off = 0
OR
RESET
SETPOINTS
BF1 SUPERVISION: Current 52b& Current 52b
AND AND
IA > PICKUP IB > PICKUP IC > PICKUP
RUN RUN RUN
IN > PICKUP
RUN
SETPOINTS
BF1 PHASE HIGHSET PICKUP: BF1 NTRL HIGHSET PICKUP:
IA > PICKUP IB > PICKUP
IC > PICKUP
RUN RUN RUN
IN > PICKUP
RUN BF1 PHASE LOWSET PICKUP: BF1 NTRL LOWSET PICKUP:
SETPOINTS
BF1 T1 PICKUP DELAY:
t1
PKP
0
SETPOINTS
BF1 T2 PICKUP DELAY:
t2
PKP
0
SETPOINTS
BF1 T3 PICKUP DELAY:
t3
PKP
0
SETPOINTS
BF1 LOWSET DELAY:
t
LOW
0
SETPOINTS
BF1 DROPOUT DELAY:
0
T
DPO
OR OR
OR
BF1 Lowset OP
BF1 OP
FlexLogic Operands
BF1 52b Superv OP
BF1 INITIATE: EXTERNAL INITIATE INITIATE IN1 ... INITIATE IN15
OR
SETPOINTS
SETPOINTS
SIGNAL INPUT:
USED ONLY IN
845 & 889
CT Bank 1 - J1
845
&
889
only
Relay ( Ready = 1)
BKR 1: Trip Relay Select
Setpoints/System/
Breakers/BKR1: