Pick-up
The THDV pick-up
setting parameter controls the the pick-up and activation of the function.
They define the maximum allowed measured voltage THD before action from the function. Before the
function activates alarm signals, their corresponding pick-up elements need to be activated with the
setting parameter
Enable THD alarm. The function constantly calculates the ratio between the setting
values and the calculated voltage THD. 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. 5.6.5 - 318. Pick-up settings.
Name
Range
Step Default
Description
Enable
THDV
alarm
0: Enabled
1: Disabled
-
0:
Enabled Enables and disables the THD alarm function.
THDV
pick-
up
0.10…100.00% 0.01% 10.00%
The pick-up setting for the THD alarm element from the phase voltages. At
least one of the phases' 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.
Table. 5.6.5 - 319. Information displayed by the function.
Name
Range
Description
THD> LN
behaviour
1: On
2: Blocked
3: Test
4: Test/
Blocked
5: Off
Displays the mode of THD block.
This parameter is visible only when
Allow setting of individual LN mode is enabled in
General menu.
THD condition
0: Normal
1: Start
2: Alarm
3: Blocked
Displays status of the monitoring function.
Function blocking
The block signal is checked in the beginning of each program cycle. The blocking signal is received
from the blocking matrix in the function's dedicated input. If the blocking signal is not activated when
the pick-up element activates, a START signal is generated and the function proceeds to the time
characteristics calculation.
If the blocking signal is active when the pick-up element activates, a BLOCKED signal is generated and
the function does not process the situation further. If the START function has been activated before the
blocking signal, it resets and the release time characteristics are processed similarly to when the pick-
up signal is reset.
The blocking of the function causes an HMI display event and a time-stamped blocking event with
information of the startup current values and its fault type to be issued.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
388
© Arcteq Relays Ltd
IM00001
Summary of Contents for Generator Commander
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