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 103 % is built into
the function and is always relative to the
P
set
< value.
Figure. 5.3.18 - 154. Activation and deactivation characteristics of low power blocking.
The
Low power block setting parameter can be used to prevent an accidental trip before active power
exceeds the pick-up setting. The LPB signal is deactivated when the measured active power exceeds
the pick-up settings reset value (= 1.03 x
P
set
).
Table. 5.3.18 - 156. Pick-up settings.
Name
Description
Range
Step
Default
P
set
<
Pick-up setting
0.0…100 000kW
0.01kW
100kW
P
set
<
Low power block
0.0…100 000kW
0.01kW
50kW
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.
Table. 5.3.18 - 157. Information displayed by the function.
Name
Range
Step
Description
P< condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays the status of the protection function.
Expected
operating
time
0.000...1800.000s
0.005s
Displays the expected operating time when a fault occurs.
Time
remaining to
trip
-1800.000...1800.000s 0.005s
When the function has detected a fault and counts down time
towards a trip, this displays how much time is left before tripping
occurs.
P meas/P set
at the
moment
1250.00P
m
/P
set
0.01P
m
/P
set
The ratio between the measured power and the pick-up value.
A
AQ
Q-F215
-F215
Instruction manual
Version: 2.04
223
