Figure. 5.4.16 - 91. Simplified function block diagram of the power protection function.
Measured input
The function block uses three-phase power values (active, reactive, or apparent). A -20 ms averaged
value is used for pre-fault data registering. The used power measurement value depends on user input.
If the protection relay has more than one CT module, the
Measured side parameter determines which
current measurement is used for power measurement.
Table. 5.4.16 - 150. Measurement inputs of the power protection function.
Signal
Description
Time base
3PH active power (P)
Total three-phase active power
5ms
3PH reactive power (Q)
Total three-phase reactive power
5ms
3PH apparent power
Total three-phase apparent power
5ms
General settings
The following general settings define the general behavior of the function. These settings are static i.e.
it is not possible to change them by editing the setting group.
Table. 5.4.16 - 151. General settings of the function.
Name
Range
Step Default
Description
PQS>/< LN mode
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
-
0: On
Set mode of PWR block.
This parameter is visible only when
Allow setting of individual LN mode is
enabled in
General menu.
PQS>/<
measurement side
1: POW1
2: POW2
-
1:
POW1
Defines which power measurement module is used by the function.
This setting is available if the device has more than one current
measurement module.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
176
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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