Dielectric ageing of solid insulators relative to impact ionization

Tsitsoglou, I; Halaris, PG; Karagiannopoulos, CG; Bourkas, PD

dc.contributor.author	Tsitsoglou, I	en
dc.contributor.author	Halaris, PG	en
dc.contributor.author	Karagiannopoulos, CG	en
dc.contributor.author	Bourkas, PD	en
dc.date.accessioned	2014-03-01T01:48:32Z
dc.date.available	2014-03-01T01:48:32Z
dc.date.issued	1999	en
dc.identifier.issn	10783466	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25513
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0032667609&partnerID=40&md5=de33882376deb1648c3378c44cd0d8c2	en
dc.subject.other	Dielectric aging	en
dc.subject.other	Aging of materials	en
dc.subject.other	Capacitors	en
dc.subject.other	Electric breakdown of solids	en
dc.subject.other	Electric charge	en
dc.subject.other	Electric field effects	en
dc.subject.other	Electrodes	en
dc.subject.other	Ionization of solids	en
dc.subject.other	Oscillographs	en
dc.subject.other	Partial discharges	en
dc.subject.other	Voltage measurement	en
dc.subject.other	Electric insulators	en
dc.title	Dielectric ageing of solid insulators relative to impact ionization	en
heal.type	journalArticle	en
heal.publicationDate	1999	en
heal.abstract	This work investigates the phenomena which take place during the dielectric ageing of solid insulators. For this purpose, specimens of pertinax and industrial bakelite were electrically stressed by an imposed high AC voltage. The electrode set-up used was metal tip-sample-metal plane in insulating transformer oil environment. Thus, the imposed field was inhomogeneous, such as those found in practical applications. Measurements were taken by increasing the imposed voltage in steps of 1 KV until the ultimate breakdown of the insulators and the charge that flows through the sample as a result of partial discharges. The partial discharges appeared in the oscillographs in the form of potential steps in the measuring capacitor voltage, which was placed in series with the electrode set-up. From these measurements, the exponential increase of the produced charge in relation to the value of the imposed electric field was noted. The satisfactory agreement of theoretical data and experimental measurements show that impact ionization takes place during the dielectric ageing stages of solid insulators.	en
heal.journalName	International Journal of Power and Energy Systems	en
dc.identifier.volume	19	en
dc.identifier.issue	2	en
dc.identifier.spage	125	en
dc.identifier.epage	128	en