Effect of applied field and rate of voltage rise on surface breakdown of oil-immersed polymers

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Wilson, Mark P. and Timoshkin, Igor V. and Given, Martin J. and MacGregor, Scott J. and Sinclair, Mark A. and Thomas, Ken J. and Lehr, Jane M. (2011) Effect of applied field and rate of voltage rise on surface breakdown of oil-immersed polymers. IEEE Transactions on Dielectrics and Electrical Insulation, 18 (4). pp. 1003-1010. ISSN 1070-9878 (https://doi.org/10.1109/TDEI.2011.5976088)

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Abstract

In sub-systems of high-voltage, pulsed-power machines, the introduction of a solid into bulk liquid insulation located between two conductors is often necessary to provide mechanical support. Breakdown events on or around the surface of the solid can result in permanent damage to the insulation system. Described in the present paper are experimental results pertaining to surface breakdown of five different solid dielectrics held between plane-parallel electrodes immersed in mineral oil. The effect of varying level of peak applied field from 200 kV/cm (dV/dt 70 kV/µs) to 1 MV/cm (dV/dt 350 kV/µs) is investigated, and the breakdown voltages and times to breakdown are compared to those for an open oil gap. The time to breakdown is shown to be reduced by the introduction of a solid spacer into the gap. Rexolite and Torlon samples suffered significant mechanical damage, and consistently showed lower breakdown voltage than the other materials - average streamer propagation velocity up to 125 km/s was implied by the short times to breakdown. Although ultra-high molecular weight polyethylene yielded the longest times to breakdown of the five types of liquid-solid gap, breakdown events could be initiated at lower levels of applied field for spacers of this material than those with permittivity closely matched to that of the surrounding mineral oil. Polypropylene and low-density polyethylene are concluded to provide the most stable performance in mineral oil. Due to the similarity of the applied voltage wave-shape (1/6.5 µs) to short-tail lightning impulses, the results may also be of interest to high-voltage system designers in the power industry.

ORCID iDs

Wilson, Mark P. ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Timoshkin, Igor V. ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, Given, Martin J. ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, MacGregor, Scott J. ORCID logoORCID: https://orcid.org/0000-0002-0808-585X, Sinclair, Mark A., Thomas, Ken J. and Lehr, Jane M.;
  • Item type:Article
    ID code:27706
    Dates:
    Date
    Event
    5 August 2011
    Published
    Notes:(c) 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Dr Igor Timoshkin
    Date deposited:14 Sep 2011 14:07
    Last modified:13 Dec 2024 01:11
    URI:https://strathprints.strath.ac.uk/id/eprint/27706
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