Capacitance change during the aging of a combined system of a solid-liquid dielectric under switching impulse voltages

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dc.contributor.author Karagiannopoulos, CG en
dc.contributor.author Agoris, DP en
dc.contributor.author Bourkas, PD en
dc.date.accessioned 2014-03-01T02:41:31Z
dc.date.available 2014-03-01T02:41:31Z
dc.date.issued 1998 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/30511
dc.subject High Voltage en
dc.subject Mathematical Model en
dc.subject Partial Discharge en
dc.subject.other Aging of materials en
dc.subject.other Capacitance en
dc.subject.other Dielectric materials en
dc.subject.other Electric charge measurement en
dc.subject.other Insulating oil en
dc.subject.other Mathematical models en
dc.subject.other Partial discharges en
dc.subject.other Phenols en
dc.subject.other Bakelite en
dc.subject.other Switching impulse voltage en
dc.subject.other Impulse testing en
dc.title Capacitance change during the aging of a combined system of a solid-liquid dielectric under switching impulse voltages en
heal.type conferenceItem en
heal.identifier.primary 10.1109/ISEIM.1998.741793 en
heal.identifier.secondary http://dx.doi.org/10.1109/ISEIM.1998.741793 en
heal.publicationDate 1998 en
heal.abstract This paper presents the result of an experimental investigation of the arising non-linear phenomena in bakelite and phenol impregnated pressboard specimens (pertinax), immersed in insulating oil, under the application of high voltage impulses. For this purpose, bakelite and pertinax samples were electrically stressed with 250/2500 μs switching impulse voltages through a tip-plane electrode assembly. The total electric charge flow through the specimens and the overall capacitance C of the metal tip-solid dielectric-metal plane combination were measured. In the high-field regime, the experimental results show an exponential increase of the overall capacitance which may be attributed to the excessive charge flow due to the electron avalanche effect. The aforementioned capacitance involved with the partial discharges depends on the environment temperature (partial discharges enhanced by temperature). Further theoretical consideration leads to a mathematical model which gives an expression for C. The theoretical expectations, on the basis of this model, are found to be in good agreement with the obtained experimental results. en
heal.publisher Inst Elec Eng Japan, Tokyo, Japan en
heal.journalName Proceedings of the International Symposium on Electrical Insulating Materials en
dc.identifier.doi 10.1109/ISEIM.1998.741793 en
dc.identifier.spage 509 en
dc.identifier.epage 512 en

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