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Breakdown of mineral oil : effect of electrode geometry and rate of voltage rise

Wilson, Mark and Timoshkin, Igor and Given, M and MacGregor, Scott and Wang, Tao and Sinclair, M.A. and Thomas, K.J. and Lehr, J.M. (2012) Breakdown of mineral oil : effect of electrode geometry and rate of voltage rise. IEEE Transactions on Dielectrics and Electrical Insulation, 19 (5). pp. 1657-1664. ISSN 1070-9878

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Abstract

Experimental data on the propagation of streamers in mineral oil is important for the design of high-voltage systems in the power and pulsed-power industries. In the present study, breakdown voltages and pre-breakdown delay times were measured for planeparallel electrodes, and for two non-uniform electrode arrangements. For each geometry, the breakdown characteristics were determined for impulses of rise-time 100 ns, and also rise-time 1 μs. The maximum rate of voltage rise (dV/dt) was 4 MV/μs. For the non-uniform geometries with inter-electrode gap length of 8.5 mm, the time to breakdown was 2.5-3 times longer for impulses of rise-time 1 μs than for 100 ns risetime. The time-to-breakdown data suggest that streamer propagation velocity increases with higher values of dV/dt. For example, the estimated propagation velocity for pinplane geometry with a 1 μs rise-time is 10-12 km/s. At 100 ns rise-time for the same electrode geometry, the average propagation velocity exceeds 40 km/s. The results are compared with data previously generated in parallel liquid-solid gaps, and it is concluded that the time to breakdown is longer, and that higher applied fields are required to initiate breakdown, in open oil gaps compared to the case when a solid spacer is present. The results presented are intended to provide reference data for designers of oil-immersed, high-voltage systems such as power transformers and pulsed-power supplies.

Item type: Article
ID code: 41665
Keywords: breakdown voltage, dielectric liquids, dielectric breakdown, mineral oil, electrode geometry , voltage rise, rate, effect, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 23 Oct 2012 16:59
    Last modified: 05 Sep 2014 18:21
    URI: http://strathprints.strath.ac.uk/id/eprint/41665

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