When a single line to ground fault happens on the MV side of a HV/MV system, only a small portion of the fault current is injected into the ground by the ground-grid of the faulty substation. In fact the fault current is distributed between grounding electrodes and MV cables sheaths. In systems with isolated neutral or with resonant earthing this may be sufficient to provide safety from electric shock. Experimental measurements were performed on a real MV distribution network: a real single line to ground fault was made and fault currents were measured in the faulty substation and in four neighbouring substations. In this paper the problem of fault current distribution is introduced, the test system is described and the measurements results are presented.

Current and Voltage Behaviour During a Fault in a HV/MV System: Methods and Measurements / Colella, Pietro; Napoli, Roberto; Pons, Enrico; Tommasini, Riccardo; Barresi, A.; Cafaro, G.; De Simone, A.; Di Silvestre, M. L.; Martirano, L.; Montegiglio, P.; Morozova, E.; Pariseg, ; Parise, L.; Riva Sanseverino, E.; Torelli, F.; Tummolillo, F.; Valtorta, G.; Zizzo, G.. - CD-ROM. - (2015), pp. 404-409. (Intervento presentato al convegno 2015 IEEE 15th International Conference on Environment and Electrical Engineering tenutosi a Roma nel June 10-13, 2015) [10.1109/EEEIC.2015.7165196].

Current and Voltage Behaviour During a Fault in a HV/MV System: Methods and Measurements

COLELLA, PIETRO;NAPOLI, Roberto;PONS, ENRICO;TOMMASINI, Riccardo;
2015

Abstract

When a single line to ground fault happens on the MV side of a HV/MV system, only a small portion of the fault current is injected into the ground by the ground-grid of the faulty substation. In fact the fault current is distributed between grounding electrodes and MV cables sheaths. In systems with isolated neutral or with resonant earthing this may be sufficient to provide safety from electric shock. Experimental measurements were performed on a real MV distribution network: a real single line to ground fault was made and fault currents were measured in the faulty substation and in four neighbouring substations. In this paper the problem of fault current distribution is introduced, the test system is described and the measurements results are presented.
2015
9781479979929
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2611957