The paper deals with the potential occurrence of large temporary overvoltages in a medium voltage (MV) distribution system, due to a phase conductor interruption along a high voltage (HV) subtransmission line. In meshed HV systems, the chance of overvoltages is quite small and often the dissymmetry due to the series fault is tolerated for a relatively long time. Radial configurations, liable to incur severe overvoltages in case of series faults, can occur at HV level due to contingencies and/or maintenance. The explanation of the phenomenon and an extensive parametric study of one such case involving a 180 km long, 220 kV overhead line radially supplying a HV/MV substation are presented, evidencing the potential onset of large power frequency overvoltages and severe dissymmetry at both HV and MV level. EMTP-type time domain simulations are also reported, confirming the possible extent of the temporary overvoltages.

Large temporary overvoltages in MV network due to a series fault in the HV subtransmission system / Gatta, F. M.; Geri, A.; Lauria, S.; Maccioni, M.; Cerretti, A.; D'Orazio, L.. - (2021), pp. 1-6. ((Intervento presentato al convegno 2021 IEEE Madrid PowerTech, PowerTech 2021 tenutosi a Madrid; Spain [10.1109/PowerTech46648.2021.9494822].

Large temporary overvoltages in MV network due to a series fault in the HV subtransmission system

Gatta F. M.;Geri A.;Lauria S.;MacCioni M.
;
2021

Abstract

The paper deals with the potential occurrence of large temporary overvoltages in a medium voltage (MV) distribution system, due to a phase conductor interruption along a high voltage (HV) subtransmission line. In meshed HV systems, the chance of overvoltages is quite small and often the dissymmetry due to the series fault is tolerated for a relatively long time. Radial configurations, liable to incur severe overvoltages in case of series faults, can occur at HV level due to contingencies and/or maintenance. The explanation of the phenomenon and an extensive parametric study of one such case involving a 180 km long, 220 kV overhead line radially supplying a HV/MV substation are presented, evidencing the potential onset of large power frequency overvoltages and severe dissymmetry at both HV and MV level. EMTP-type time domain simulations are also reported, confirming the possible extent of the temporary overvoltages.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1567069
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