Previous experimental studies of lightning-impulse electric strength have used the method proposed in the IEC-WG 10-04 and ASIM D-3300 standards. Following this method the breakdown occurs on the tail of the wave, and the value of electric strength obtained by this method corresponds to a probability of breakdown of 10 to 20%. Results are presented here of tests performed on a transformer oil in order to determine its behavior under lightning stress when the discharge occurs at the front or on the crest of the wave. The test procedure is described, and the results are presented and discussed. The preliminary results show that the volt-time-to-breakdown law for negative polarity is in accordance with the usual dielectric pattern.
VOLT-TIME CHARACTERISTICS OF INSULATING OILS STRESSED BY LIGHTNING IMPULSES / MAZZETTI DI PIETRALATA, Carlo; Pompili, Massimo. - STAMPA. - (1987), pp. 365-369. (Intervento presentato al convegno Ninth International Conference on Conduction and Breakdown in Dielectric Liquids tenutosi a Salford, Regno Unito nel 27-31 Luglio 1987).
VOLT-TIME CHARACTERISTICS OF INSULATING OILS STRESSED BY LIGHTNING IMPULSES
MAZZETTI DI PIETRALATA, Carlo;POMPILI, Massimo
1987
Abstract
Previous experimental studies of lightning-impulse electric strength have used the method proposed in the IEC-WG 10-04 and ASIM D-3300 standards. Following this method the breakdown occurs on the tail of the wave, and the value of electric strength obtained by this method corresponds to a probability of breakdown of 10 to 20%. Results are presented here of tests performed on a transformer oil in order to determine its behavior under lightning stress when the discharge occurs at the front or on the crest of the wave. The test procedure is described, and the results are presented and discussed. The preliminary results show that the volt-time-to-breakdown law for negative polarity is in accordance with the usual dielectric pattern.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
