Insulation properties of composite dielectric arrangements

Topalis, FV; Gonos, IF; Stathopoulos, IA

dc.contributor.author	Topalis, FV	en
dc.contributor.author	Gonos, IF	en
dc.contributor.author	Stathopoulos, IA	en
dc.date.accessioned	2014-03-01T01:51:54Z
dc.date.available	2014-03-01T01:51:54Z
dc.date.issued	2002	en
dc.identifier.issn	10783466	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26499
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0036904781&partnerID=40&md5=365c2df4e39454ade83f4e4893db4918	en
dc.subject	Air gaps	en
dc.subject	Barrier effect	en
dc.subject	Dielectric arrangements	en
dc.subject	Insulation	en
dc.subject.other	Dielectric properties	en
dc.subject.other	Electric field effects	en
dc.subject.other	Electric potential	en
dc.subject.other	Electrodes	en
dc.subject.other	Transformer windings	en
dc.subject.other	Barrier effects	en
dc.subject.other	Electric insulation	en
dc.title	Insulation properties of composite dielectric arrangements	en
heal.type	journalArticle	en
heal.publicationDate	2002	en
heal.abstract	This article examines the barrier effect on the dielectric strength of nonuniform electric fields stressed by impulse voltages. The electric field is a rod-plane air gap with length up to 40 cm. The barrier is a sheet of craft paper that is placed in several positions between the grounded plane and the high-voltage rod. The experimental results show that the position of the barrier substantially influences the dielectric strength of the gap. Another parameter that is also investigated is the electrode configuration. The diameter of the rod electrode and the shape of the tip affect the uniformity of the field and therefore the dielectric strength. The dependence of the breakdown voltage upon the shape of the impulse stress is also investigated. The experimental tests show that the strength of the gap decreases with the time to crest of the impulse. It becomes minimum under voltages with a time to crest of some tens of microseconds and starts increasing under slower impulses with time to crest of some hundreds of microseconds. The obtained results seem to be very useful for the design and optimization of the internal insulation of high-voltage electrical equipment.	en
heal.journalName	International Journal of Power and Energy Systems	en
dc.identifier.volume	22	en
dc.identifier.issue	3	en
dc.identifier.spage	146	en
dc.identifier.epage	149	en