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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/12850

Title: Influence of sand/dust contamination on the breakdown of asymmetrical air gaps under lightning impulses
Authors: Al-Arainy, A.A.
Malik, N.H
Qureshi, M.I.
Keywords: Air Pollution; Dust; Electric Breakdown; Lightning; Sand, Silica
Issue Date: 1992
Publisher: Proceedings of the 1995 International Symposium on Electrical Insulating Materials; Tokyo, Jpn; 17 September 1995 through 20 September 1995; Code 44321
Citation: IEEE transactions on electrical insulation Volume 27, Issue 2, April 1992, Pages 193-206
Abstract: The authors review the important parameters of particles which are present in the environment when sand/dust storms occur. Basic features of the experimental system are summarized. Extensive measurements of breakdown voltages and times to breakdown are carried out under clean and polluted conditions using rod-plane and sphere-plane gaps. It is shown that when positive lightning impulse voltages are applied to asymmetrical gaps from 5 cm to 2 m, the presence of sand/dust contamination can cause a breakdown voltage reduction. However, the presence of particles can greatly affect the breakdown characteristics of rod-plane and sphere-plane gaps under negative lightning impulses. For gaps with moderately nonuniform field distributions, the particles can decrease V50 by ≤ 40%. If the field distribution is more nonuniform, the contamination can increase V50 by ≤ 50%. For highly nonuniform field gaps, V50 values for clean and contaminated gaps are approximately similar. Such effects are primarily caused by particles which settle on the cathode.
URI: http://hdl.handle.net/123456789/12850
ISSN: 00189367
Appears in Collections:College of Engineering

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