Pick-up
Figure. 5.3.2.2 - 90. Measurement connection of the Iuc> function.
The protection function uses a formula which takes the highest measured value of the phase's
current, then subtracts from this value the lowest measured value of the phase's current, and finally
divides the result with the mean of all phases. This value is then compared to the
Iset Alarm and
the
Iset Trip parameters. The function constantly calculates the ratio between the I
set
and the
calculated magnitude (
I
unb
). The reset ratio of 97 % is built into the function and is always relative to
the
I
set
value.
Table. 5.3.2.2 - 55. Pick-up settings.
Name
Range
Step
Default
Description
Iset Alarm
0.10…50.00×I
n
0.01×I
n
1.20×I
n
Defines the pick-up setting for the alarm.
Iset Trip
0.10…50.00×I
n
0.01×I
n
1.20×I
n
Defines the pick-up setting for the trip.
Definite time delay alarm
0.000…1 800.00s
0.005s
0.04s
Defines the definite time delay for the ALARM signal.
Definite time delay trip
0.000…1 800.00s
0.005s
0.04s
Defines the definite time delay for the TRIP signal.
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.
Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. Additionally, the function includes an internal
inrush harmonic blocking option which is applied according to the parameters set by the user. If the
blocking signal is not activated when the pick-up element activates, a START signal is generated and
the function proceeds to the time characteristics calculation.
A
AQ
Q-C213
-C213
Instruction manual
Version: 2.04
104