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4.4. 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*) - IEC Extremely Inverse
Dial 0,02 1,25 0,01 - 1,25
Tap 0,10 7,00 0,01 Inominal 0,50
Operating time 0,02 300,00 0,01 s 0,2
(1*) IEC Inverse, IEC Very inverse, IEC Extremely inverse, Defined time, IEEE Inverse, IEEE Very inverse, IEEE 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 is selected for the curve setting, the operating time depends on the curve, dial and tap
settings.
If the unit operates as defined time, the function is activated at 100% of the set tap value, and it
deactivates at 95%.
If the unit operates with a curve, the function is activated at 110% of the set tap 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 IEC 60255-151 or IEEE, which are described in the "Curves" section.
4.5. Cold Load Pickup
This unit is used to prevent undesired operations of the overcurrent functions in the cases where when
the line is reenergized; 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 3 1 - 3
No Load time 0.02 300.00 0.01 s 15
Cold Load Time 0.02 300.00 0.01 s 15