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4.5. 50/51N/G Function. Neutral inverse time overcurrent.
This protection function can be set by using the following parameters:
Function Description Minimum Maximum Step Unit Default
50/51N/G
Neutral inverse time overcurrent
Permission - - Yes/No - No
Curve - - (1*) - Extremely Inverse
Dial 0,02 1,25 0,01 - 1,25
Tap 0,10 7,00 0,01 I nominal 0,50
Operating time 0,02 300,0 0,01 s 0,2
(1*) IEC Inverse, IEC Very inverse, IEC Extremely inverse, IEC Long time inverse, Defined time, ANSI Inverse, ANSI
Very inverse, ANSI Extremely inverse
If the option "Defined time" is selected for the curve setting, the unit behaves like an
instantaneous overcurrent unit. In this case, the unit operating time is adjusted by using the
parameter "Operating time".
If a curve (inverse, very inverse or extremely inverse) is selected for the curve setting, the
operating time depends on the curve, dial and pick-up settings.
If the unit operates as defined time, the function is activated at 100% of the set pick-up value,
and it deactivates at 95%.
If the unit operates with a curve, the function is activated at 110% of the set pick-up value, and it
deactivates at 100%. The reset is instantaneous in both cases.
The activation time is accurate to ±5% or ±30ms, whichever is higher, of the theoretical activation
time. The curves used are IEC60255-151 or ANSI-IEEEE, which are described in the "Curves"
section.
4.6. Function CLP. Cold Load Pickup
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.