An experimental investigation of the thermal coefficient of stationary DC-contacts using different DC-current values

Paisios, MP; Polykrati, AD; Halaris, P; Karagiannopoulos, CG; Bourkas, PD

dc.contributor.author	Paisios, MP	en
dc.contributor.author	Polykrati, AD	en
dc.contributor.author	Halaris, P	en
dc.contributor.author	Karagiannopoulos, CG	en
dc.contributor.author	Bourkas, PD	en
dc.date.accessioned	2014-03-01T02:49:42Z
dc.date.available	2014-03-01T02:49:42Z
dc.date.issued	2004	en
dc.identifier.issn	14827891	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34699
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-11844286973&partnerID=40&md5=827a387425f2e00ebee35e9e40898a0c	en
dc.subject	Constriction resistance	en
dc.subject	Crossing resistance	en
dc.subject	DC Measurement on stationary contacts	en
dc.subject	Film resistance	en
dc.subject	Temperature coefficient	en
dc.subject.other	Current density	en
dc.subject.other	Electric potential	en
dc.subject.other	Electric resistance	en
dc.subject.other	Interfaces (materials)	en
dc.subject.other	Microstructure	en
dc.subject.other	Networks (circuits)	en
dc.subject.other	Stress analysis	en
dc.subject.other	Constriction resistance	en
dc.subject.other	Crossing resistance	en
dc.subject.other	DC measurement on stationary contacts	en
dc.subject.other	Film resistance	en
dc.subject.other	Temperature coefficient	en
dc.subject.other	Electric currents	en
dc.title	An experimental investigation of the thermal coefficient of stationary DC-contacts using different DC-current values	en
heal.type	conferenceItem	en
heal.identifier.secondary	442-188	en
heal.publicationDate	2004	en
heal.abstract	This paper presents results of experimental investigations of the potential and temperature difference across DC-contacts in practical applications without interruption of power (stationary contacts), such as decouplers, fuse-boxes etc, under a constant clamping spring force (capillarity force), having DC-current values as parameters. The above-mentioned contacts have achieved a stage of moderate degradation, after aging in real operating conditions. According to our measurements the voltage drop versus time decreases across the contacts, at the first phase of reoperation and under a constant DC-current value. This fact indicates, that the thermal coefficient becomes negative at high current densities. The negative temperature coefficient may be attributed to microstructures formed on the apparent contacting area, such as oxides and other chemical compounds, creating an interfacial layer, which seems to show semiconducting behaviour. Based on the experimental results, we have attempted to make a mathematical approximation to determine the thermal coefficient.	en
heal.journalName	Series on Energy and Power Systems	en
dc.identifier.spage	467	en
dc.identifier.epage	471	en