Double Impulse Tests of Long Airgaps. Part 1: Engineering Problems and Physical Processes: the Basis of Recent Tests

Waters, Ronald 1986. Double Impulse Tests of Long Airgaps. Part 1: Engineering Problems and Physical Processes: the Basis of Recent Tests. IEE Proceedings A Physical Science, Measurement and Instrumentation, Management and Education, Reviews 133 (7) , pp. 395-409. 10.1049/ip-a-1.1986.0063

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Abstract

Collaborative tests have been performed using nonstandard impulses, and employing a wide range of diagnostic techniques. Part 1 of the paper describes the need for such tests, the experimental arrangement and the digital data techniques developed for the tests. Part 2 is an account of the decay of the leader channel in long airgaps and the recovery of dielectric strength. It was found that the leader conductivity had a lifetime of the order of 1 ms. In part 3 of the paper, the influence of a nonstandard impulse front on the leader growth is examined in detail. The results show that overstressing of the gap can result in a reduced probability of break-down, and the cause of this effect is studied. In phase-to-phase structures, on the other hand, the case of a negative surge preceding a positive can be particularly dangerous: the effect of pre-existing negative space charges on positive leader growth is therefore described in part 4. Large-scale influences which cause more vigorous leader processes have been observed.

Item Type:	Article
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher:	The Institution Of Electrical Engineers
ISSN:	0143702X
Last Modified:	16 Nov 2017 12:00
URI:	https://orca.cardiff.ac.uk/id/eprint/106634

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