Impulsive breakdown of mineral oil and natural and synthetic ester liquids when containing varying levels of moisture

Williamson, Chris and Timoshkin, Igor V. and MacGregor, Scott J. and Wilson, Mark P. and Given, Martin J. and Sinclair, Mark and Jones, Aled (2021) Impulsive breakdown of mineral oil and natural and synthetic ester liquids when containing varying levels of moisture. IEEE Transactions on Plasma Science, 49 (1). pp. 466-475. ISSN 0093-3813 (https://doi.org/10.1109/TPS.2020.3044133)

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Abstract

This article reports and discusses the results of impulse breakdown study of different insulating liquids under highly divergent electric field conditions. Samples of a natural ester (Envirotemp FR3), a synthetic ester (MIDEL 7131), and a naphthenic mineral oil (Shell Diala S4 ZX) at different levels of relative humidity were exposed to HV impulses with a nominal 7-\mu \text{s} rise time and 150-kV peak voltage of both positive and negative polarity. A strong dependence of the breakdown voltage and time to breakdown of the investigated dielectric liquids was observed with respect to the polarity of the applied HV impulses. It was shown that the FR3 natural ester liquid has a higher dielectric strength when exposed to positive impulse than when under negative impulse stress. The opposite breakdown behavior was observed for the synthetic ester MIDEL 7131 and the naphthenic oil Shell Diala S4 ZX which exhibited lower breakdown voltage under positive energization as compared with the negative energization. The breakdown voltage and prebreakdown time obtained in the present tests of the naphthenic oil, Shell Diala S4 ZX, lie between that of the ester liquids irrespective of impulse polarity. It has been established that no statistically significant variations exist in the breakdown parameters (breakdown voltage and time to breakdown) of the studied dielectric liquids as their relative humidity is increased under either impulse polarity. The obtained results will help in coordination of practical applications of low environmental impact dielectric fluids in power and pulsed power systems and components.

  • Item type:Article
    ID code:75404
    Dates:
    Date
    Event
    11 January 2021
    Published
    25 December 2020
    Published Online
    28 November 2020
    Accepted
    Notes:© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:15 Feb 2021 11:37
    Last modified:18 Apr 2024 00:28
    URI:https://strathprints.strath.ac.uk/id/eprint/75404
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