Temperature effects on partial discharges in the combined system of a solid-liquid dielectric during lightning impulse voltage

Bourkas, PD; Karagiannopoulos, CG; Agoris, DP; Psomopoulos, CS

dc.contributor.author	Bourkas, PD	en
dc.contributor.author	Karagiannopoulos, CG	en
dc.contributor.author	Agoris, DP	en
dc.contributor.author	Psomopoulos, CS	en
dc.date.accessioned	2014-03-01T02:41:34Z
dc.date.available	2014-03-01T02:41:34Z
dc.date.issued	1998	en
dc.identifier.issn	01642006	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30533
dc.subject	Electric Field	en
dc.subject	Environmental Temperature	en
dc.subject	Molecular Structure	en
dc.subject	Partial Discharge	en
dc.subject	Temperature Effect	en
dc.subject.other	Electric conductivity of liquids	en
dc.subject.other	Electric conductivity of solids	en
dc.subject.other	Lightning	en
dc.subject.other	Molecular structure	en
dc.subject.other	Partial discharges	en
dc.subject.other	Thermal effects	en
dc.subject.other	Solid liquid dielectrics	en
dc.subject.other	Dielectric materials	en
dc.title	Temperature effects on partial discharges in the combined system of a solid-liquid dielectric during lightning impulse voltage	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/ELINSL.1998.694872	en
heal.identifier.secondary	http://dx.doi.org/10.1109/ELINSL.1998.694872	en
heal.publicationDate	1998	en
heal.abstract	The experimental work presented in this paper shows that the level of partial discharges in a solid-liquid dielectric increases with temperature. Partial discharge implications in the `metal-dielectric-metal' system were investigated using 1.2/50 μs impulse voltages under environmental temperatures of 20 °C and 40 °C. Although the repeat rate of the partial discharges appears to be almost independent of temperature, the charge associated with these partial discharges shows a remarkable increase. Furthermore, the threshold electric field required for partial discharge initiation was found to be reduced significantly as the system's temperature was increased. The commonly accepted model of Gemant and Philipoff incorporating pre-existing defects or irregularities of the molecular structure in the solid-liquid dielectric and voids in the volume of the solid dielectric has been used for the interpretation of the obtained results. The approach of the solid-liquid dielectric to the above experimental results may imply a conductivity increase of the system in the high field region due to enhanced electron avalanche mechanism.	en
heal.publisher	IEEE, Piscataway, NJ, United States	en
heal.journalName	Conference Record of IEEE International Symposium on Electrical Insulation	en
dc.identifier.doi	10.1109/ELINSL.1998.694872	en
dc.identifier.volume	2	en
dc.identifier.spage	631	en
dc.identifier.epage	635	en