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Double impulse tests of long airgaps. Part 1: Engineering problems and physical processes: the basis of recent tests

Double impulse tests of long airgaps. Part 1: Engineering problems and physical processes: the basis of recent tests

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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.

Inspec keywords: impulse testing; spark gaps; high-voltage techniques; overvoltage; surges

Other keywords: gas discharge; nonstandard impulses; digital acquisition; voltage stresses; airgaps; digital data techniques; plasma physics; surges; phase-to-phase insulations; double impulse tests; high-voltage technology

Subjects: Arcs and sparks; Protection apparatus; Gaseous insulation, breakdown and discharges

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Correspondence
This article has following corresponding article(s):
Double impulse tests of long airgaps. Part 2: Leader decay and reactivation
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