Switching-impulse flashover of air gaps and insulators in an artificially polluted atmosphere

Ely, C.H.A.; Roberts, William J.

doi:10.1049/piee.1968.0290

Cited by 13 publications

(2 citation statements)

References 3 publications

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“…Then, on the basis that the current / and the leader velocity dL/dt are related by dL (70) where q « 40juC/m is the charge on the leader channel, we can show that the average gradient along the leader channel is …”

Section: 2mentioning

confidence: 99%

“…Under these conditions, the withstand gradient to switching impulses may fall to as little as 0-1 -0-2MV/m compared with the values of 0-3-O4MV/m for clean insulators. 70 The mitigation of pollution effects by the greasing of insulators remains the most effective present practice. Classification of long-gap discharge phenomena…”

Section: (D) Effect Of Surface Pollutionmentioning

confidence: 99%

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Air insulation at large spacings

Jones

Waters

1978

Proc. Inst. Electr. Eng. UK

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The nature of recent international research collaboration is described. Breakdown data obtained on a wide variety of air clearances are comprehensively summarised; the effects of the polarity and shape of the testing impulse, the geometry of the electrodes and the condition of the atmosphere are considered separately. Recent improvements in the physical understanding of the pre-breakdown phenomena are discussed in some detail, and their application to engineering problems, by means of models, is considered. Newly developed methods of field calculation are applied to complex configurations subjected to more than one voltage stress. Statistical methods are used, both in assigning confidence intervals to test data, and in predicting risks of failure.

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Section: 2mentioning

confidence: 99%

Section: (D) Effect Of Surface Pollutionmentioning

confidence: 99%