Study on breakdown characteristic and discharge model of conductor-plane gap under typical vegetation flame

被引：0

作者：

Li P. ^{[1
]}

Ruan J. ^{[1
]}

Huang D. ^{[1
]}

Long M. ^{[1
]}

Wu T. ^{[2
]}

Pu Z. ^{[3
]}

机构：

[1] School of Electrical Engineering, Wuhan University, Wuhan, 430072, Hubei Province

[2] China Electric Power Research Institute, Wuhan, 430074, Hubei Province

[3] College of Electrical Engineering and New Energy, Three Gorges University, Yichang, 443002, Hubei Province

来源：

Zhongguo Dianji Gongcheng Xuebao | / 14卷 / 4001-4010期

关键词：

Breakdown characteristic; Discharge model; Leakage current; Transmission line; Vegetation flame;

D O I：

10.13334/j.0258-8013.pcsee.152092

中图分类号：

学科分类号：

摘要：

Tripping accidents of transmission lines caused by forest fire are frequently. Hence, the typical vegetation which is easily to cause the lines to trip is selected to study the AC breakdown characteristics of conductor-plane gap under fire condition by the simulation forest fire experiment platform. The breakdown characteristic differences of different vegetation flames were analyzed through the data of breakdown voltage and leakage current. According to the discharge mechanism of gap and the image of arc path development, the discharge model of gap under fire condition was established and its validity was verified. Results show that, the gap dielectric strength is decreased significantly under the vegetation flames, especially under the fir branches flame, the average breakdown voltage gradient of gap can be reduced to 10% of that in the pure air gap; the leakage current is maximum when the vegetation is in the stable combustion phase and the value in the positive half wave is much larger than the negative half wave, which can be about ten times than that of the negative half wave; under the influence of particles and ash, the vegetation such as straw and thatch, can also cause transmission line to trip when the flame height is not high. Research results can provide the reference for the safe and stable operation measures of transmission lines under the condition of forest fire. © 2016 Chin. Soc. for Elec. Eng.

引用

页码：4001 / 4010

页数：9

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