GE 750, Instruction Manual

Page: 230 / 504

13-
14
750/760 Feeder Management Relay GE Power Management
13.4 DEMAND 13 S6 MONITORING
13
13.4.4 REACTIVE POWER DEMAND
The reactive power demand is monitored by comparing to a pickup value. If the reactive power demand pickup
is ever exceeded, the relay can be configured to cause an alarm or signal an output relay.
■
REACTIVE POWER
■
[ENTER] for more
The
REACTIVE POWER
Demand setpoints path is:
\ SETPOINTS \ S6 MONITORING \ DEMAND \ REACTIVE POWER
REACTIVE PWR DEMAND
FUNCTION: Disabled
Range: Disabled, Alarm, Latched Alarm, Control
Selects the required function.
MEASUREMENT TYPE:
Block Interval
Range: Thermal Exponential, Block Interval, Rolling Demand
Select one of three reactive power demand calculation methods.
THERMAL 90% RESPONSE
TIME: 15 min
Range: 5 min, 10 min, 15 min, 20 min, 30 min, 60 min
This message is only displayed if the
MEASUREMENT TYPE
is selected as
Ther-
mal Exponential
. Enter the time required for a steady state reactive power to
indicate 90% of the actual value. This setpoint allows the user to approximately
match the response of the relay to analog instruments.
TIME INTERVAL:
20 min
Range: 5 min, 10 min, 15 min, 20 min, 30 min, 60 min
This message is only displayed if the
MEASUREMENT TYPE
is selected as Block
Interval or ‘Rolling Demand’. Enter the time period over which the reactive
power demand calculation is to be performed.
REACTIVE PWR DEMAND
RELAYS (3-7):-----
Range: Any Combination of the 3-7 AUXILIARY Relays
Select the output relays required.
REACTIVE PWR DEMAND
PICKUP: 10.0 MVar
Range: 0.1 to 3000.0 in steps of 0.1 Mvar
1
Enter the threshold value for reactive power demand. For example, if an action
is required when the reactive power demand is above 1.5 Mvar, enter
1.5
for
this setpoint. When the maximum reactive power demand exceeds this setting,
the programmed action will be performed.
1
Power quantities auto-range to show units appropriate to the power sys-
tem size.