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Impact of thermal and electrical aging on breakdown strength of oil-impregnated paper
KTH, School of Electrical Engineering (EES).
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-0759-4406
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2015 (English)In: 2015 IEEE Eindhoven PowerTech, PowerTech 2015, IEEE conference proceedings, 2015Conference paper (Refereed)Text
Abstract [en]

In this paper the impact of thermal and electrical aging on AC and impulse breakdown strength of oil-impregnated paper was investigated. Sheets of paper were thermally aged at 140 °C for 30 days. A comparison between AC and impulse breakdown strength of unaged paper layers, 10, 20 and 30 days thermally aged paper was performed. In order to investigate the effect of electrical aging, first the paper layers were exposed to partial discharges for 6 hours at accelerated electric stress. The partial discharge was created inside paper samples by introducing a disc shaped cavity on the center of the paper samples. The effect of partial discharges was then investigated on the impulse breakdown strength of oil-impregnated paper. The study shows that thermal aging has very small effect on AC breakdown strength. However, impulse breakdown strength of oil-impregnated paper may reduce up to 40% due to exposure to PD.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015.
Keyword [en]
Breakdown strength, oil-impregnated paper, Partial discharges, Thermal aging, AC breakdowns, Breakdown strengths, Electric stress, Electrical aging, Exposed to, Impulse breakdown, Oil impregnated papers, Paper samples, Electric breakdown
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-181161DOI: 10.1109/PTC.2015.7232691ScopusID: 2-s2.0-84951325807ISBN: 9781479976935OAI: oai:DiVA.org:kth-181161DiVA: diva2:902565
Conference
IEEE Eindhoven PowerTech, PowerTech 2015, 29 June 2015 through 2 July 2015
Note

QC 20160211

Available from: 2016-02-11 Created: 2016-01-29 Last updated: 2016-02-11Bibliographically approved

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Niasar, Ghaffarian MohamadTaylor, NathanielEdin, Hans
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School of Electrical Engineering (EES)Electromagnetic Engineering
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