Measured input
The function block uses analog current measurement values. It always uses the RMS magnitude of the
current measurement input. The user can select I01, I02 or the calculated I0 for the residual current
measurement. A -20 ms averaged value of the selected magnitude is used for pre-fault data
registering.
Table. 5.3.1 - 45. Measurement inputs of the CBFP function.
Signal
Description
Time base
IL1RMS
RMS measurement of phase L1 (A) current
5ms
IL2RMS
RMS measurement of phase L2 (B) current
5ms
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. 5.3.1 - 46. 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.
A
AQ
Q-S215
-S215
Instruction manual
Version: 2.04
83
Summary of Contents for AQ-S215
Page 1: ...AQ S215 Bay control IED Instruction manual...
Page 249: ...Figure 7 4 151 Example block scheme A AQ Q S215 S215 Instruction manual Version 2 04 248...
Page 269: ...Figure 8 13 172 Device installation A AQ Q S215 S215 Instruction manual Version 2 04 268...
Page 287: ...10 Ordering information A AQ Q S215 S215 Instruction manual Version 2 04 286...