GE 845 - Page 356

4–228 845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-87: Directional Power logic diagram
LED: PICKUP
Three - phase Power
Real Power (P)
Reactive Power (Q)
SETPOINTS
BLOCK : Off=0
AND
SETPOINTS
DIR POWER 1 FUNCTION : Disabled Trip Alarm Latched Alarm Configurable
OR
SETPOINTS
DIR POWER 1 RCA : DIRECTIONAL POWER CHARACTERISTICS
SETPOINTS
DIR POWER 1 STAGE 1 DELAY: t
PKP
100 ms
FlexLogic Operands
DirPwr 1 Stg2 PKP
AN D AND AND
Command
RESET
OR
LED: ALARM
LED: TRIP
Operate Output Relay 1 (TRIP)
RUN
SETPOINTS
RELAYS Do Not Operate , Operate
DIR POWER 1 CALIBRATION : DIR POWER 1 STAGE 1 SMIN : DIR POWER 1 STAGE 2 SMIN :
SETPOINTS
DIR POWER 1 STAGE 2 DELAY : t
PKP
100 ms
DirPwr 1 Stg1 PKP DirPwr 1 Stg1 OP DirPwr 1 Stg2 OP
DirPwr 1 PKP
OR
OR
DirPwr 1 OP
S
LATCH
Set-
Dominant
R
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