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If a curve (inverse, very inverse or extremely inverse) is selected for the curve setting, the Time Delay
depends on the curve, Time Dial (TMS) and Current Tap settings.
If the unit operates with defined time, the function is activated at 100% of the set Current Tap value,
and it deactivates at 90%.
If the unit operates with a curve, the function is activated at 110% of the set Current Tap value, and it
deactivates at 100%.
The reset is instantaneous in both cases.
The activation time accuracy is ± 5% or ±40ms of the theoretical activation time, whichever is greater.
The curves used are IEC 60255-151 or IEEE, which are described in the "Curves" section.
5.3.
50N Function. Instantaneous calculated neutral overcurrent
This protection function can be set by using three parameters:
Function
Description
Minimum
Maximum
Step
Unit
Default
50N
Instantaneous calculated neutral overcurrent
Function Enable
-
-
Yes/No
-
No
Current Tap
0.20
20,00
0.01
xIn
1.00
Time Delay
0.05
300.000
0.01
s
0.20
The Time Delay is completely independent from the operating current that flows through the
equipment, so if the neutral current exceeds its predetermined value for an equal or greater amount of
time than this pre-set value, the protection function activates (trips) and does not reset itself until the
value of the phase drops below the point of current pick-up.
The function activates at 100% of the pre-set input and deactivates at 90%. The reset is
instantaneous.
The accuracy of the Time Delay is equal to the pre-set time ±40ms or ±0.5% (greater of both).
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