Table. 5.4.8 - 91. 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").
Table. 5.4.8 - 92. General settings of the function.
Name
Range
Default
Description
CBFP LN
mode
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
1: On
Set mode of CBF block.
This parameter is visible only when
Allow setting of individual LN mode is enabled
in
General menu.
Measurement
side
1: Side 1
2: Side 2
1: Side
1
Defines which current measurement module is used by the function.
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. 5.4.8 - 93. 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-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
111
Summary of Contents for AQ-M257
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