Arcteq AQ-T215, Instruction Manual

Page: 144 / 411

Signal Description Time base
IL3RMS RMS measurement of phase L3 (C) current 5ms
I01RMS RMS measurement of residual input I01 5ms
I02RMS RMS measurement of residual input I02 5ms
I0Calc Calculated residual current from the phase current inputs 5ms
DOIN Monitors digital output relay status 5ms
DIIN Monitors digital input status 5ms
The selection of the used AI channel 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.
General settings
The following general settings define 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. 5.3.8 - 88. CBFP monitoring signal definitions.
Name Description
Signal
in
monitor
Defines which TRIP events of the used protection functions trigger the CBFP countdown. For the CBFP function to
monitor the signals selected here, the "Operation mode selection" parameter must be set to a mode that includes
signals (e.g. "Signals only", "Signals or DO", "Current and signals and DO").
Trip
monitor
Defines which output relay of the used protection functions trigger the CBFP countdown. For the CBFP function to
monitor the output relays selected here, the "Operation mode selection" parameter must be set to a mode that
includes digital outputs (e.g. "DO only", "Current and DO", "Current or signals or DO").
Pick-up
The setting parameters I
set
and I0
set
control the pick-up and the activation of the current-dependent
CBFP function. They define the minimum allowed measured current before action from the function.
The function constantly calculates the ratio between the I
set
or the I0
set
and the measured magnitude
(
I
m
) for each of the three phases and the selected residual current input. The reset ratio of 97 % is built
into the function and is always relative to the
I
set
value. 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. 5.3.8 - 89. Operating mode and input signals selection.
Name Range Step Default Description
I0Input
0: Not in use
1: I01
2: I02
3: I0Calc
-
0: Not
in use
Selects the residual current monitoring source, which can be either from the two
separate residual measurements (I01 and I02) or from the phase current's
calculated residual current.
A AQ Q-T215 -T215
Instruction manual
Version: 2.04
143