Pick-up
The
I
low
,
I
high
and
I
over
setting parameters control the the pick-up and activation of the cold load pick-
up function. They define the maximum and minimum allowed measured current before action from the
function. The function constantly calculates the ratio between the setting values 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 setting value. The setting value is common for all measured phases. When the
I
m
exceeds the setting value (in single, dual or all phases) it triggers the pick-up operation of the function.
Table. 5.4.3 - 236. Pick-up settings.
Name
Range
Step
Default
Description
I
low
0.01…40.00×In 0.01×In 0.20×In
The pick-up setting for low current detection. All measured currents must be
below this setting in order for the cold load pick-up signal to be activated.
I
high
0.01…40.00×In 0.01×In 1.20×In
The pick-up setting for high current detection. All measured currents must
exceed this setting in order for the cold load pick-up signal to be activated.
I
over
0.01…40.00×In 0.01×In 2.00×In
The pick-up setting for overcurrent detection. If this setting is exceeded by
any of the measured currents, the cold load pick-up signal is released
immediately.
The pick-up activation of the function is not directly equal to the CLPU ACT signal generation of the
function. The CLPU ACT 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. 5.4.3 - 237. Information displayed by the function.
Name
Range
Description
CLPU LN
behaviour
1: On
2: Blocked
3: Test
4: Test/Blocked
5: Off
Displays the mode of CLP block.
This parameter is visible only when
Allow setting of individual LN mode is enabled in
General menu.
CLP condition
0: Normal
1: Curr low
2: Overcurrent
On
3: CLPU On
4: CLPU
blocked
Displays status of the control 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 CLPU ACT 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 CLPU ACT function has been activated before
the blocking signal, it resets and processes the release time characteristics similarly to when the pick-
up signal is reset.
A
AQ
Q-C255
-C255
Instruction manual
Version: 2.06
© Arcteq Relays Ltd
IM00035
283
