Effect of electrode geometry and rate of voltage rise on streamer propagation in mineral oil

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Wilson, M.P. and Timoshkin, I.V. and Given, M.J. and Macgregor, S.J. and Sinclair, M.A. and Thomas, K.J. and Lehr, J.M.; (2011) Effect of electrode geometry and rate of voltage rise on streamer propagation in mineral oil. In: Proceedings of the 17th IEEE international conference on dielectric liquids. IEEE, NOR. ISBN 9781424473526 (https://doi.org/10.1109/ICDL.2011.6015480)

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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, prebreakdown delay times were measured for plane-parallel electrodes, and for two types of non-uniform electrode arrangement. For each geometry, the breakdown characteristics were determined for impulses of rise-time 100 ns, and also risetime 1 μs. The maximum applied voltage magnitude was 400 kV, giving a maximum dV/dt of 4 kV/ns. 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 rise-time. The time-to-breakdown data suggest that streamer propagation velocity increases with higher values of dV/dt. For example, the estimated propagation velocity for pin-plane 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 presented are intended to provide reference data for designers of oil-immersed high-voltage systems in both the power and pulsed-power industries.

ORCID iDs

Wilson, M.P. ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Timoshkin, I.V. ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, Given, M.J. ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, Macgregor, S.J. ORCID logoORCID: https://orcid.org/0000-0002-0808-585X, Sinclair, M.A., Thomas, K.J. and Lehr, J.M.;
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