
Rev.06
44/226
4.11. Function CLP. Cold Load Pickup
This unit is used to prevent undesired operations of the overcurrent functions in the cases where
when the line is deenergised, all the loads enter at the same time.
The settings of this function are as follows:
Function
Description
Minimum
Maximum
Step
Unit
Default
CLP
Cold Load Pickup
Permission
-
-
Yes/No
-
No
Setting group
1
4
1
-
4
No Load time
0.02
300.00
0.01
s
15
Cold Load Time
0.02
300.00
0.01
s
15
The two time parameters have the following meaning:
•
No Load Time
: If the circuit has been open for less time than the setting, the Cold Load
Pickup function is not in working conditions.
•
Cold Load Time
: After the circuit has been closed, during this time the new setting group is
applied. After this time, the relay returns to the adjusted setting group.
The function operates according to the following automaton. The automaton consists of five
states, in three of those states the relay works with normal setting group (the table adjusted in
general settings), and in the other two, with the new settings group.
The relay uses the current level to determine the circuit breaker state (open or closed). If the
current is less than 8 % of the rated level, it is understood that the line is open, with an extremely
low usage level (operating at night, or on weekends). In one case or the other Cold Load is in
working condition.
The relay usually operates with the settings in their active table. When the circuit breaker opens,
a timer “No Load Time” starts. After this time, the relay considers that the circuit breaker is open,
so the CLP function is in working conditions.
Once the circuit breaker is closed, CLP function picks-
up and “Cold load time” starts to count.
During this time the relay will work with the new setting group regardless of the circuit breaker
situation, this is, without taking into account whether the circuit breaker is maintained closed or is
open.
When the new setting group is applied, not every protection functions change, only functions 50,
50/51, 50N/G and 67N/67NI are modified according this new setting group.
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