GE 750, Instruction Manual

Page: 232 / 504

13-
16
750/760 Feeder Management Relay GE Power Management
13.4 DEMAND 13 S6 MONITORING
13
13.4.5 APPARENT POWER DEMAND
The apparent power demand is monitored by comparing to a pickup value. If the apparent power demand
pickup is ever exceeded, the relay can be configured to cause an alarm or signal an output relay.
■
APPARENT POWER
■
[ENTER] for more
The
APPARENT POWER
Demand setpoints path is:
\ SETPOINTS \ S6 MONITORING \ DEMAND \ APPARENT POWER
APPARENT 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 apparent 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 apparent 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 apparent
power demand calculation is to be performed.
APPARENT PWR DEMAND
RELAYS (3-7):-----
Range: Any Combination of the 3-7 AUXILIARY Relays
Select the output relays required.
APPARENT PWR DEMAND
PICKUP: 10.0 MVA
Range: 0.1 to 3000.0 in steps of 0.1 MVA
1
Enter the threshold value for apparent power demand. For example, if an
action is required when the apparent power demand is above 1.5 MVA, enter
1.5
for this setpoint. When the maximum apparent 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.