GE 845 - Page 389

CHAPTER 4: SETPOINTS MONITORING
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–261
Figure 4-106: Breaker Arcing Current logic diagram
SETPOINTS
BKR 1 ARCING FUNCTION : Alarm Latched Alarm
OR
AND
LED: ALARM /
LATCHED ALARM
Command
AND
S R
LATCH # 1
Set-
Dominant
Configurable
FlexLogic Operands
BKR 1 Arc OP
SETPOINTS
Do Not Operate, Operate OUTPUT RELAY 3 (X)
CT Bank current IB
CT Bank current IC
AND
SETPOINTS
BKR 1 ARCING BLOCK : Off = 0 CT Bank current IA Disabled
AND
COMMAND
CLEAR BKR 1 ARCING CURRENT : YES = 1
OR
RESET
IA
²
t Integrate
IB
²
t Integrate
IC
²
t Integrate
RUN RUN RUN
SETPOINTS
BKR 1 ARCING DELAY:
t
delay
0
BKR 1 ARCING INITIATION: Off = 0
SETPOINTS
OR
100ms
0
IA
²
cycle
IB
²
cycle
IC
²
cycle
Add to accumulator
Set all to 0
Select highest value
BKR 1 ARCING CURRENTS
RECORDS
SETPOINTS
BKR 1 ARCING ALARM LEVEL :
kA
²
cyc > Alarm Level
NO = 0
Total I
²
cycle
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