CHAPTER 6: SETPOINTS S6 MONITORING
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–175
Apparent Power The Apparent Power Demand is monitored by comparing to a Pickup value. If the Apparent
Power Demand Pickup is ever equalled or exceeded, the relay can be configured to cause
an alarm or signal an output relay.
Path: S6 MONITORING > DEMAND > APPARENT PWR DEMAND
FUNCTION
Range: Disabled, Alarm, Latched Alarm
Default: Disabled
For details see Common setpoints
.
MEASUREMENT TYPE
Range: Blk Interval, Exponential, Rolling Dmd
Default: Blk Interval
This setpoint sets the measurement method. Three methods can be applied.
THERMAL 90% RESPONSE TIME
Range: 5 min, 10 min, 15 min, 20 min, 30 min
Default: 15 min
This setpoint sets the time required for a steady state Apparent Power to indicate 90% of
the actual value and allows the user to approximately match the response of the relay
to analog instruments. The setpoint is visible only if MEASUREMENT TYPE is “Exponential”.
TIME INTERVAL
Range: 5 min, 10 min, 15 min, 20 min, 30 min
Default: 20 min
This setpoint sets the time period over which the Apparent Power Demand calculation is
to be performed. The setpoint is visible only if MEASUREMENT TYPE is “Block Interval” or
“Rolling Demand”.
PICKUP
Range: 0.1 to 300000.0 kVA in steps of 0.1 kVA
Default: 1000.0 kVA
This setpoint sets the Apparent Power Demand Pickup level.
BLOCK
For details see Common setpoints
.
OUTPUT RELAY X
For details see Common setpoints
.
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset
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