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Role of thermal and electrical relaxations for the long-term conduction current in polyethylene
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2016 (English)In: Proceedings of the 2016 IEEE International Conference on Dielectrics, ICD 2016, Institute of Electrical and Electronics Engineers (IEEE), 2016, 1106-1109 p.Conference paper (Refereed)
Abstract [en]

The characterization of the electrical conduction behavior of polymeric insulating material is a challenging task. Typical reasons are the underlying complexity of the physical processes, the smallness of the current, and the long relaxation times. Moreover, even if the external conditions like applied voltage and temperature are time-constant, often a steady-state direct current (DC) is not established during the measurement time, which may last up from hours to months. This work reports on DC current measurements on 1 mm thick press molded LDPE and XLPE samples. The results show that the conductance is slowly decaying sub-linearly with time, I∼tp, with 0 <-p < 1, p often around-0.5. In certain cases an intermediate current maximum is observed. There is strong indication that the decay of the effective conductivity is due a thermal process rather than to an electrical process.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016. 1106-1109 p.
Keyword [en]
Conductivity, cross-linked polyethylene insulation, HVDC insulation, power cable insulation, Electric conductivity, Insulating materials, Insulation, Cross linked polyethylene insulation, DC current measurement, Effective conductivity, Electrical conduction, Electrical relaxations, External conditions, Polymeric insulating materials, Polyethylenes
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-194952DOI: 10.1109/ICD.2016.7547812ScopusID: 2-s2.0-84988443740ISBN: 9781509028023OAI: oai:DiVA.org:kth-194952DiVA: diva2:1049071
Conference
1st IEEE International Conference on Dielectrics, ICD 2016, 3 July 2016 through 7 July 2016
Note

QC 20161123

Available from: 2016-11-23 Created: 2016-11-01 Last updated: 2016-11-23Bibliographically approved

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Edin, Hans Ezz
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