Effect of Partial Discharges on Thermal Breakdown of Oil Impregnated Paper
2014 (English)In: Conference Proceedings of ISEIM 2014, IEEE conference proceedings, 2014, -199 p.Conference paper (Refereed)
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.
Partial discharge, thermal breakdown, oil-impregnated paper
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kth:diva-154076DOI: 10.1109/ISEIM.2014.6870752ISI: 000346123600046ScopusID: 2-s2.0-84906545362OAI: oai:DiVA.org:kth-154076DiVA: diva2:755140
Conference of ISEIM 2014,June 1-5, 2014 Niigata City, Japan
FunderSwedish Energy Agency
QC 201411062014-10-132014-10-132015-01-26Bibliographically approved