Enhanced partial discharges due to temperature increase in the combined system of a solid-liquid dielectric

Dervos, C; Bourkas, PD; Kayafas, EA; Stathopulos, IA

dc.contributor.author	Dervos, C	en
dc.contributor.author	Bourkas, PD	en
dc.contributor.author	Kayafas, EA	en
dc.contributor.author	Stathopulos, IA	en
dc.date.accessioned	2014-03-01T01:07:52Z
dc.date.available	2014-03-01T01:07:52Z
dc.date.issued	1990	en
dc.identifier.issn	0018-9367	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10221
dc.subject	Charge Transfer	en
dc.subject	Environmental Temperature	en
dc.subject	Partial Discharge	en
dc.subject.classification	Engineering, Electrical & Electronic	en
dc.subject.other	Dielectric Materials	en
dc.subject.other	Electric Measurements	en
dc.subject.other	Electric Transformers--Insulation	en
dc.subject.other	Insulating Oil	en
dc.subject.other	Thermal Effects	en
dc.subject.other	Dielectric Tests	en
dc.subject.other	Impulse Voltage Effects	en
dc.subject.other	Solid Dielectrics	en
dc.subject.other	Electric Discharges	en
dc.title	Enhanced partial discharges due to temperature increase in the combined system of a solid-liquid dielectric	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/14.55718	en
heal.identifier.secondary	http://dx.doi.org/10.1109/14.55718	en
heal.language	English	en
heal.publicationDate	1990	en
heal.abstract	Partial discharges which emanate from solid dielectrics immersed in insulating oil when high impulse voltages are applied under different environmental temperatures (20, 40 and 80°C) are discussed. The solid dielectrics used for the measurements are phenol-impregnated pressboard and industrial bakelite. The samples are cut in wafers of 150 mm diameter and are 1 or 2 mm thick. The insulating oil is a typical transformer oil. The switching type of the impulse voltage used, 250/2500 μs, corresponds to functional situations and is long enough to produce the effects that can be detected without the consideration of charge transfer phenomena due to fast rates of field changes. Experimental results show that the total charge transfer due to partial discharges is increased by temperature. A possible explanation of the undergoing physical process may be that in the low-field regime, temperature perturbation effects on the injected current are characterized by the conductivity changes in the volume of the dielectric, while as partial discharges start occurring, avalanche multiplication of conduction electrons appears to be the dominant phenomenon, characterizing the behavior of a metal/thick insulator/metal structure in the high-field regime. The circuits, measurement, and measuring procedures are discussed.	en
heal.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	en
heal.journalName	IEEE Transactions on Electrical Insulation	en
dc.identifier.doi	10.1109/14.55718	en
dc.identifier.isi	ISI:A1990DJ76800002	en
dc.identifier.volume	25	en
dc.identifier.issue	3	en
dc.identifier.spage	469	en
dc.identifier.epage	474	en