Table. 5.4.14 - 138. Measurement inputs of the f>/< function.
Signals
Description
Time base
VT1 U1, U2, U3
L-N voltages of the first voltage transformer
5ms
VT2 U1, U2, U3
L-N voltages of the second voltage transformer
5ms
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. 5.4.14 - 139. General settings of the function.
Name
Range
Default
Description
f</> LN
mode
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
0: On
Set mode of FRQV block.
This parameter is visible only when
Allow setting of individual LN mode is enabled in
General menu.
f> enable
f>> enable
f>>>
enable
f>>>>
enable
f< enable
f<< enable
f<<<
enable
f<<<<
enable
1: No
2: Yes
0: No
Enables or disables the stage.
Pick-up and time delay
The
f
set
>, f
set
>>, etc.setting parameters control the pick-up of each stage of the f>/< function.
They define the maximum or minimum allowed measured frequency before action from the function.
The function constantly calculates the ratio between the pick-up setting and the measured frequency.
The reset ratio of 20mHz is built into the function and is always relative to the pick-up value.
Table. 5.4.14 - 140. Pick-up settings.
Name
Description
Range
Step
Default
f> used in setting group
f>> used in setting group
f>>> used in setting
group
f>>>> used in setting
group
f< used in setting group
f<< used in setting group
f<<< used in setting
group
f<<<< used in setting
group
Enables or disables the protection stage in the setting
group.
0: No
1: Yes
-
0: No
fset>
fset>>
fset>>>
fset>>>>
Pick-up setting
10.00…80.00Hz
0.01Hz 51Hz
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
165
Summary of Contents for AQ-M257
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