Figure. 5.3.10 - 124. Selectable measurement magnitudes with 2LL+U3+U4 VT connection (P-E voltages not available without
residual voltage).
P-P Voltages and P-E Voltages selections follow phase-to-neutral or phase-to-phase voltages in the
first three voltage channels (or two first voltage channels in the 2LL+U3+U4 mode).
U4 input selection
follows the voltage in Channel 4.
U3Input selection only follows the voltage in Channel 3 if the
2LL+U3+U4 mode is in use.
Pick-up
The
U
set
setting parameter controls the pick-up of the U> function. This defines the maximum allowed
measured voltage before action from the function. The function constantly calculates the ratio
between the
U
set
and the measured magnitude (
U
m
) for each of the three voltages. The reset ratio of
97 % is built into the function and is always relative to the
U
set
value. The setting value is common for
all measured amplitudes, and when the
U
m
exceeds the
U
set
value (in single, dual or all voltages) it
triggers the pick-up operation of the function.
Table. 5.3.10 - 102. Pick-up settings.
Name
Description
Range
Step
Default
Operation mode
Pick-up criteria selection
0: 1 voltage
1: 2 voltages
2: 3 voltages
-
0: 1 voltage
U
set
Pick-up setting
50.00…150.00%U
n
0.01%U
n
105%U
n
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. 5.3.10 - 103. Information displayed by the function.
Name
Range
Step
Description
U< pick-
up setting
0.0...1 000 000.0V
0.1V
The primary voltage required for tripping. The displayed pick-up voltage
level depends on the pick-up setting and the voltage transformer
settings.
A
AQ
Q-F205
-F205
Instruction manual
Version: 2.04
© Arcteq Relays Ltd
IM00013
169
Summary of Contents for AQ F205
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