Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance

LIAO Yifan; HU Chuanliang; TANG Jun; YANG Fan; CHEN Zhihao; ZHOU Yu; LU Zhanhui

doi:10.3969/j.issn.0258-2724.2018.06.004

Volume 31 Issue 6

Dec. 2018

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Journal of Southwest Jiaotong University > 2018 > 53(6): 1117-1122.

LIAO Yifan, HU Chuanliang, TANG Jun, YANG Fan, CHEN Zhihao, ZHOU Yu, LU Zhanhui. Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1117-1122. doi: 10.3969/j.issn.0258-2724.2018.06.004

Citation:

LIAO Yifan, HU Chuanliang, TANG Jun, YANG Fan, CHEN Zhihao, ZHOU Yu, LU Zhanhui. Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1117-1122. doi: 10.3969/j.issn.0258-2724.2018.06.004

Citation:

LIAO Yifan, HU Chuanliang, TANG Jun, YANG Fan, CHEN Zhihao, ZHOU Yu, LU Zhanhui. Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance[J]. Journal of Southwest Jiaotong University, 2018, 53(6): 1117-1122. doi: 10.3969/j.issn.0258-2724.2018.06.004

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Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance

doi: 10.3969/j.issn.0258-2724.2018.06.004

Received Date: 18 Sep 2017
Publish Date: 01 Dec 2018

Abstract

Abstract

To analyse the lightning impulse breakdown characteristics of the parallel gaps of contaminated insulators with different salt densities, the SC-210 porcelain cross-arm insulator was used to conduct the lightning impulse test. Comparing with the electric field simulation results of the clean and contaminated insulators, the phenomenon of flashover along the surface of the insulator was analysed several times during the test. The tests and analysis indicate that in case of the SC-210 porcelain cross-arm installed with parallel gaps, its lightning impulse breakdown voltage U50% decreases with increasing salt density and tends to saturate more readily. The voltage-time characteristics curve of the lightning impulse of the contaminated insulator and the lightning protection gap gradually intersect, and the phenomenon of flashover along the surface of the insulator occurs several times during the test. The results of the study suggest that the effect of contamination on the flashover/breakdown location on the surface of the insulator should be considered in the insulation timing of the parallel gap and the insulator string.
- lightning protection,
- parallel gap,
- contamination,
- lightning impulse flashover,
- voltage-time characteristics

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References(21)

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Analysis of Lightning Breakdown Characteristics of Contaminated Insulators in Parallel Clearance

doi: 10.3969/j.issn.0258-2724.2018.06.004

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