A model for the flashover process on non-uniformly polluted insulators

Gonos, IF; Topalis, FV; Stathopulos, IA

dc.contributor.author	Gonos, IF	en
dc.contributor.author	Topalis, FV	en
dc.contributor.author	Stathopulos, IA	en
dc.date.accessioned	2014-03-01T01:51:49Z
dc.date.available	2014-03-01T01:51:49Z
dc.date.issued	2002	en
dc.identifier.issn	02286203	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26466
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0036411874&partnerID=40&md5=fa995ccdab5c784c1cce333459d88a8e	en
dc.subject	Equivalent salt deposit density	en
dc.subject	Insulators	en
dc.subject	Pollution	en
dc.subject.other	Air pollution	en
dc.subject.other	Electric insulators	en
dc.subject.other	Electric potential	en
dc.subject.other	Electric resistance	en
dc.subject.other	Flashover	en
dc.subject.other	Leakage currents	en
dc.subject.other	Permittivity	en
dc.subject.other	Non-uniformly polluted insulators	en
dc.subject.other	Computer simulation	en
dc.title	A model for the flashover process on non-uniformly polluted insulators	en
heal.type	journalArticle	en
heal.publicationDate	2002	en
heal.abstract	The flashover process over polluted insulators is described by well-known analytical equations, published by various investigators, mainly Obenhaus and Alston. These procedures were used for the formulation of a mathematical model that permits determination of the parameters of the flashover under uniform or non-uniform pollution of the insulator. The calculated values were found to be in agreement with laboratory tests on artificially polluted insulators. All the experimental techniques use uniform distribution of the pollution layer on the surface of the insulator. Tests on artificially polluted insulators under non-uniform pollution are rare. On the other hand, Rizk measured the deposit of natural pollution on the surface of various insulators for a long period of time. The mathematical model of this work was applied for the calculation of the dielectric strength of the insulator under the determined non-uniform distribution. The type of insulator investigated here is similar to the ones of Rizk. The surface of the insulator is divided into finite elements, uniformly contaminated, across the creepage length. The required parameters for the calculation of the critical voltage for the flashover are the dimensions of the insulator, the arc constants, and the specified distribution of the pollution. The dependence of the critical voltage upon the distribution of the pollution layer and the total pollutant deposit on the insulator are also presented.	en
heal.journalName	International Journal of Modelling and Simulation	en
dc.identifier.volume	22	en
dc.identifier.issue	3	en
dc.identifier.spage	137	en
dc.identifier.epage	141	en