Figure. 5.3.17 - 151. Simplified function block diagram of the P> function.
Measured input
The function block uses three-phase active power values. A -20 ms averaged value of the selected
magnitude is used for pre-fault data registering. If the protection relay has more than one CT module,
the
Measured side parameter determines which current measurement is used for the power
measurement.
Table. 5.3.17 - 150. Measurement inputs of the P> function.
Signal
Description
Time base
3PH Active power (P)
Total three-phase active power
5ms
Pick-up
The
P
set
>setting parameter controls the pick-up of the P> function. This defines the maximum allowed
measured three-phase active power before action from the function. The function constantly calculates
the ratio between the
P
set
>and the measured magnitude (P
m
). The reset ratio of 97 % is built into the
function and is always relative to the
P
set
>value.
Table. 5.3.17 - 151. Pick-up settings.
Name
Description
Range
Step
Default
P
set
>
Pick-up setting
0.0…100 000kW
0.01kW
100kW
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
Read-only parameters
The relay's
Info page displays useful, real-time information on the state of the protection function. It is
accessed either through the relay's HMI display, or through the setting tool software when it is
connected to the relay and its Live Edit mode is active.
A
AQ
Q-F215
-F215
Instruction manual
Version: 2.04
219