Arcteq AQ-T215, Instruction Manual

Page: 299 / 411

Signal Description Time base
I02RMS RMS measurement of residual input I02 5ms
I1 Phase current's positive sequence component 5ms
I2 Phase current's negative sequence component 5ms
IL1Ang Angle of phase L1 (A) current 5ms
IL2 Ang Angle of phase L2 (B) current 5ms
IL3 Ang Angle of phase L3 (C) current 5ms
I01 Ang Angle of residual input I01 5ms
I02 Ang Angle of residual input I02 5ms
The selection of the AI channel in use is made with a setting parameter. In all possible input channel
variations the pre-fault condition is presented with a 20 ms averaged history value from -20 ms from
START or TRIP event.
Table. 5.5.1 - 191. Residual current input signal settings
Name Range Step Default Description
I0 input selection
0: Not in
use
1: I01
2: I02
-
0: Not
in use
Selects the measurement input for the residual current. If the residual
current is measured with a separate CT, the residual current circuit can be
monitored with the CTS function as well. However, this does not apply to
summing connections (Holmgren, etc.). If the phase current CT is summed
with I01 or I02, this selection should be set to "Not in use".
I0 direction
0: Add
1:
Subtract
- 0: Add Defines the polarity of residual current channel connection.
Comp.
natural unbalance
0: -
1:
Comp
- 0: -
When activated while the line is energized, the currently present calculated
residual current is compensated to 0.
Pick-up
The
I
set
and
I0
set
setting parameters control the current-dependent pick-up and activation of the
current transformer supervision function. They define the minimum and maximum allowed measured
current before action from the function. The function constantly calculates the ratio between the setting
values and the measured magnitude (
I
m
) for each of the three phases and for the selected residual
current input. The reset ratio of 97 % and 103% are built into the function and is always relative to the
I
set
value. The setting value is common for all measured amplitudes, and when the I
m
exceeds the
I
set
value (in single, dual or all currents) it triggers the pick-up operation of the function.
Table. 5.5.1 - 192. Pick-up settings.
Name Range Step Default Description
I
set
high
limit
0.01…40.00×I
n
0.01×I
n
1.20×I
n
Determines the pick-up threshold for phase current measurement. This
setting limit defines the upper limit for the phase current's pick-up
element.
If this condition is met, it is considered as fault and the function is not
activated.
I
set
low
limit
0.01…40.00×I
n
0.01×I
n
0.10×I
n
Determines the pick-up threshold for phase current measurement. This
setting limit defines the lower limit for the phase current's pick-up
element.
This condition has to be met for the function to activate.
A AQ Q-T215 -T215
Instruction manual
Version: 2.04
298