Table. 5.6.4 - 300. General settings.
Name
Range
Default
Description
THD> LN mode
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
1: On
Set mode of THD block.
This parameter is visible only when
Allow setting of individual LN mode is
enabled in
General menu.
THD> in side
0: CT1
1: CT2
0: CT1
Defines which current measurement module the function uses.
Measurement
magnitude
1:
Amplitude
2: Power
1:
Amplitude Defines which available measured magnitude the function uses.
Pick-up
The
Phase
THD
,
I01
THD
and
I02
THD
setting parameters control the the pick-up and activation of the
function. They define the maximum allowed measured current THD before action from the function.
Before the function activates alarm signals, their corresponding pick-up elements need to be activated
with the setting parameters
Enable phase THD alarm, Enable I01 THD alarm and Enable I02 THD
alarm. The function constantly calculates the ratio between the setting values and the calculated THD
for each of the three phases. The reset ratio of 97 % is built into the function and is always relative to
the setting value. The setting value is common for all measured phases. When the calculated THD
exceeds the pick-up value (in single, dual or all phases), it triggers the pick-up operation of the
function.
Table. 5.6.4 - 301. Pick-up settings.
Name
Range
Step Default
Description
Enable
phase
THD
alarm
0: Enabled
1: Disabled
-
0:
Enabled Enables and disables the THD alarm function from phase currents.
Enable
I01 THD
alarm
0: Enabled
1: Disabled
-
0:
Enabled Enables and disables the THD alarm function from residual current input I01.
Enable
I02 THD
alarm
0: Enabled
1: Disabled
-
0:
Enabled Enables and disables the THD alarm function from residual current input I02.
Phase
THD
pick-up
0.10…100.00% 0.01% 10.00%
The pick-up setting for the THD alarm element from the phase currents. At
least one of the phases' measured THD value has to exceed this setting in
order for the alarm signal to activate.
I01 THD
pick-up
0.10…100.00% 0.01% 10.00%
The pick-up setting for the THD alarm element from the residual current I01.
The measured THD value has to exceed this setting in order for the alarm
signal to activate.
I02 THD
pick-up
0.10…100.00% 0.01% 10.00%
The pick-up setting for the THD alarm element from the residual current I02.
The measured THD value has to exceed this setting in order for the alarm
signal to activate.
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.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
388
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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