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, P.; Napoli, R.; Pons, E.; Tommasini, R.; Barresi, A.; Cafaro, G.; De Simone, A.; Di Silvestre, M. L.; Martirano, L.; Montegiglio, P.; Morozova, E.; Parise, G.; Parise, L.; Sanseverino, E. Riva; Torelli, F.; Tummolillo, F.; Valtorta, G.; Zizzo, G.. - ELETTRONICO. - (2015), pp. 404-409. (Intervento presentato al convegno 15th IEEE International Conference on Environment and Electrical Engineering, EEEIC 2015 tenutosi a Roma, Italy 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
Cafaro, G.;De Simone, A.;Montegiglio, P.;Torelli, F.;
2015-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
