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Effect of Partial Discharges on Thermal Breakdown of Oil Impregnated Paper
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (High voltage group)ORCID iD: 0000-0003-1766-8077
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-0759-4406
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
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2014 (English)In: Conference Proceedings of ISEIM 2014, IEEE conference proceedings, 2014, -199 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the effect of partial discharges on the thermal breakdown voltage of oil-impregnated paper is investigated. A disc shaped cavity in a stack of paper sheets formed a PD source. The paper sample was exposed to partial discharges for 18 hours. Dielectric spectroscopy measurements were performed on the samples before and after exposure to PD activity. The dielectric spectroscopy results showed a big change in the real and imaginary part of the permittivity. These results were used to calculate activation energy and heat losses inside the insulation. In order to investigate the possibility of thermal breakdown in the system, the oil-impregnated paper system was simulated by using the FEM software Comsol Multiphysics. The heat produced by PD pulses and dielectric losses was considered in the simulation. The results show that for the oil-impregnated paper insulation, the PD activity can reduce the thermal breakdown voltage by a factor up to 4 times.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2014. -199 p.
Keyword [en]
Partial discharge, thermal breakdown, oil-impregnated paper
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-154076DOI: 10.1109/ISEIM.2014.6870752ISI: 000346123600046Scopus ID: 2-s2.0-84906545362OAI: oai:DiVA.org:kth-154076DiVA: diva2:755140
Conference
Conference of ISEIM 2014,June 1-5, 2014 Niigata City, Japan
Funder
Swedish Energy Agency
Note

QC 20141106

Available from: 2014-10-13 Created: 2014-10-13 Last updated: 2015-01-26Bibliographically approved

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Ghaffarian Niasar, MohamadTaylor, Nathaniel

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