Breakdown characteristics of natural and synthetic ester liquids when containing varying levels of moisture

Williamson, C. and Timoshkin, I. and MacGregor, S. and Wilson, M. P. and Given, M. J. and Sinclair, M. and Jones, A.; (2020) Breakdown characteristics of natural and synthetic ester liquids when containing varying levels of moisture. In: 2019 IEEE Pulsed Power & Plasma Science (PPPS). IEEE, Piscataway, N.J.. ISBN 9781538679692 (https://doi.org/10.1109/PPPS34859.2019.9009857)

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Abstract

Ester insulating liquids provide a number of benefits when compared with conventional naphthenic oils. To increase acceptance of esters as a long term replacement for mineral oils in high voltage/pulsed power systems, it is of paramount importance that their dielectric properties are well known. This paper examines the breakdown voltage, and time to breakdown, of MIDEL 7131 synthetic ester, the natural ester Envirotemp FR3 and a mineral oil: Shell Diala S4 ZX, at varying levels of moisture saturation, when exposed to HV impulses of both positive and negative polarity. No statistically significant difference in the breakdown voltage of the ester liquids with increasing relative humidity for either polarity was observed. Noticeable polarity dependence in breakdown voltage values was observed with Envirotemp FR3 liquid, which possesses the highest breakdown strength under positive impulses, but the lowest under negative impulses. Inversely, MIDEL 7131 exhibits the lowest breakdown voltage for positive impulses, and the highest breakdown voltage under negative impulsive energisation.

  • Item type:Book Section
    ID code:82780
    Dates:
    Date
    Event
    27 February 2020
    Published
    29 June 2019
    Accepted
    Notes:© 2020 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:14 Oct 2022 12:32
    Last modified:12 Apr 2024 00:08
    URI:https://strathprints.strath.ac.uk/id/eprint/82780
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