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ROŠER, M., ŠKOF, R., ŠTUMBERGER, G.
EARTH FAULT IN MEDIUM VOLTAGE DISTRIBUTION NETWORKS WITH RESONANT NEUTRAL EARTHING
KOMUNALNA ENERGETIKA / POWER ENGINERING, 19
Reliability of electricity supply is directly related to the supply interruptions, mostly caused by earth faults that appear in medium voltage distribution networks. One of very effective measures, that can substantially reduce the supply interruptions due to the earth fault in medium voltage distribution networks, is resonant neutral earthing. It compensates capacitive currents and reduces the current flowing through the fault which establishes better conditions for arc self-extinguishing at the earth fault location. The paper deals with conditions at the location where vegetation touches the conductor and establishes an earth fault. The results of field-testing performed in substation Krško, where earth faults were established under controlled conditions, using specially for this purpose build mechanical device, are presented and discussed.
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