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
a 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. 5.3.3 - 37. General settings of the function.
Name
Description
Range Step Default
Setting control
from comm
bus
Activating this parameter permits changing the pick-up level of the protection
stage via SCADA.
1:
Disabled
2:
Allowed
-
1:
Disabled
Measured
magnitude
Defines which available measured magnitude is used by the function. This
parameter is available when "Input selection" has been set to "I01" or "I02".
1: RMS
2: TRMS
3: Peak-
to-peak
-
1: RMS
Input selection
Defines which measured residual current is used by the function.
1: I01
2: I02
3:
I0Calc
-
1: I01
Pick-up
The
I0
set
setting parameter controls the the pick-up of the I0> function. This defines the maximum
allowed measured current before action from the function. The function constantly calculates the ratio
between the
I0
set
and the measured magnitude (
I
m
) for each of the three phases. The reset ratio of 97
% is built into the function and is always relative to the
I0
set
value. The setting value is common for all
measured phases. When the
I
m
exceeds the
I0
set
value (in single, dual or all phases) it triggers the
pick-up operation of the function.
Table. 5.3.3 - 38. Pick-up settings.
Name
Description
Range
Step
Default
I0
set
Pick-up setting
0.0001…40.00×I
n
0.0001×I
n
1.20×I
n
The pick-up activation of the function is not directly equal to the START signal generation of the
function. The START signal is allowed if the blocking condition is not active.
Read-only parameters
The relay's
Info page displays useful, real-time information on the state of the protection function. It is
accessed either through the relay's HMI display, or through the setting tool software when it is
connected to the relay and its Live Edit mode is active.
Table. 5.3.3 - 39. Information displayed by the function.
Name
Range
Step
Description
I0>
condition
0: Normal
1: Start
2: Trip
3: Blocked
-
Displays status of the protection function.
A
AQ
Q-F201
-F201
Instruction manual
Version: 2.04
82
Содержание AQ-F201
Страница 1: ...AQ F201 Overcurrent and Earth fault relay Instruction manual ...
Страница 220: ...Figure 7 4 146 Example block scheme A AQ Q F201 F201 Instruction manual Version 2 04 219 ...
Страница 226: ...Figure 8 4 151 Device installation A AQ Q F201 F201 Instruction manual Version 2 04 225 ...
Страница 227: ...Figure 8 4 152 Panel cutout dimensions and device spacing A AQ Q F201 F201 Instruction manual Version 2 04 226 ...