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Journal of Energy : Energija, Vol. 66 No. 1-4, 2017.

Original scientific paper

POWER SYSTEM NEUTRAL POINT GROUNDING

ANA DRANDIĆ orcid id orcid.org/0000-0001-5586-7531 ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, 10000 Zagreb, Croatia
ANTE MARUŠIĆ ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, 10000 Zagreb, Croatia
MARINO DRANDIĆ ; ELPUT d.o.o., Pula, Croatia
JURAJ HAVELKA ; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, 10000 Zagreb, Croatia

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Abstract

The method used for neutral point grounding is very important for power
network operation. There are many ways of grounding, which are used in practice,
and the decision on the method of neutral grounding depends on the situation in the
network connected to the substation. When deciding on the method of neutral
grounding it is necessary to thoroughly consider all the advantages and
disadvantages of individual modes of neutral grounding, and then choose the best
technical and economical solution.
This paper analyzes the ways of neutral point grounding in medium voltage
networks used in the current practice in Croatia which are isolated neutral point,
low resistance earthing, partial compensation and resonant earthing. The use of
shunt circuit-breaker is also described. Additionally, a survey of the relays used for
the neutral point grounding system inside the substations was conducted and a
brief analysis of the results is presented in the paper.

Keywords

Neutral point grounding; compensation coil; shunt trip circuitbreaker; earth-fault protection; earth fault

Hrčak ID:

199740

URI

https://hrcak.srce.hr/199740

Publication date:

15.12.2017.

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