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

Karagiannopoulos, CG; Agoris, DP; Bourkas, PD

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