GE 850 - Page 449

CHAPTER 7: MONITORING FUNCTIONS
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–29
Figure 7-18: Reactive Power Demand logic diagram
LED: PICKUP
Reactive Power Inputs
SETPOINTS
BLOCK : Off=0
AN D
REACTIVE PWR DMD FUNCTION : Disabled Alarm Latched Alarm Configurable
OR
SETPOINTS
REACTIVE PWR DMD MEASUREMENT TYPE : Calculate Reactive Power Demand
SETPOINTS
REACTIVE PWR DMD REACTIVE POWER PICKUP : Q Demand = PICKUP RUN
ReactvPwr Dmd PKP
AN D AND
Command
RESET
OR
LED: ALARM
REACTIVE PWR DMD TIME INTERVAL :
Three-Phase
Reactive Power (Q)
SETPOINTS
SETPOINTS
OUTPUT RELAY X Do Not Operate , Operate
FlexLogic Operands
S
LATCH
Set-
Dominant
R
89
$
1.cdr
REAL PWR DEMAND THERMAL 90% RESPONSE TIME :