IL2FFT
Fundamental RMS measurement of phase L2 (B) current
5 ms
IL3FFT
Fundamental RMS measurement of phase L3 (C) current
5 ms
I01FFT
Fundamental RMS measurement of residual I01 current
5 ms
I02FFT
Fundamental RMS measurement of residual I02 current
5 ms
The selection of the calculation method is made with a setting parameter (common for all
measurement channels).
General settings
The following general settings de ne the general behavior of the function. These settings are static i.e.
it is not possible to change them by editing the setting group.
Table. 5.6.3. - 109. General settings.
Name
Range
Step
Default
Description
THD> in side
0: CT1
1: CT2
-
0: CT1
De nes which current measurement module the function
uses.
Measurement
magnitude
1:
Amplitude
2: Power
-
1:
Amplitude
De nes which available measured magnitude the function
uses.
Pick-up
The
Phase
THD
,
I01
THD and
and
I02
THD
s
etting parameters control the the pick-up and activation of the
function. They de ne the maximum allowed measured current before action from the function. Before
the function activates alarm signals, their corresponding pick-up elements need to be activated with
the setting parameters
Enable phase THD alarm
,
Enable I01 THD alarm
and
Enable I02 THD alarm
.
The function constantly calculates the ratio between the setting values and the measured magnitude
for each of the three phases. The reset ratio of 97 % is built into the function and is always relative to
the settingvalue. The setting value is common for all measured phases. When the
I
m
exceeds the
I
set
value (in single, dual or all phases), it triggers the pick-up operation of the function.
Table. 5.6.3. - 110. Pick-up settings.
Name
Range Step Default
Description
Enable
phase
THD alarm
0:
Enabled
1:
Disabled
-
0:
Enabled Enables and disables the THD alarm function from phase currents.
Enable I01
THD alarm
0:
Enabled
1:
Disabled
-
0:
Enabled Enables and disables the THD alarm function from residual current input I01.
Enable I02
THD alarm
0:
Enabled
1:
Disabled
-
0:
Enabled Enables and disables the THD alarm function from residual current input I02.
Phase
THD pick-
up
0.10…
100.00
%
0.01
%
10.00
%
The pick-up setting for the THD alarm element from the phase currents. At least
one of the phases' measured THD value has to exceed this setting in order for the
alarm signal to activate.
I01 THD
pick-up
0.10…
100.00
%
0.01
%
10.00
%
The pick-up setting for the THD alarm element from the residual current I01. The
measured THD value has to exceed this setting in order for the alarm signal to
activate.
I02 THD
pick-up
0.10…
100.00
%
0.01
%
10.00
%
The pick-up setting for the THD alarm element from the residual current I02. The
measured THD value has to exceed this setting in order for the alarm signal to
activate.
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd
136
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