Selection of Lightning Tolerance Technical Parameters for 10kV Line Arresters

被引：0

作者：

Shen H. ^{[1
]}

Lei T. ^{[1
]}

He Z. ^{[1
]}

Zhao X. ^{[1
]}

Liu S. ^{[1
]}

Zhang Z. ^{[1
]}

Lu T. ^{[1
]}

机构：

[1] China Electric Power Research Institute, Haidian District, Beijing

来源：

Dianwang Jishu/Power System Technology | 2021年 / 45卷 / 09期

关键词：

10kV distribution line; High current impulse; Lightning damage; Lightning fault rate; Lightning protection; Lightning tolerance parameters; Line arrester;

D O I：

10.13335/j.1000-3673.pst.2020.1446

中图分类号：

学科分类号：

摘要：

There is not sufficient evidence to attribute the lightning damages of the arresters on 10kV distribution line to the low lightning tolerance level in the design parameters. This paper constructs a calculation model for the transient overvoltage process under direct lightning strikes. The magnitude of the surge current exceeding the withstand limit was used as the basis for judging the lightning damage to the arrester itself. Through calculation the critical current of the line arrester at failure was obtained. Then the electrical geometric model was used to calculate the lightning fault rate of the line arrester, which proves that the lightning withstands technical parameters of the arrester specified in the current technical standards can meet the requirements of the general lightning intensity areas. Further combining with the regional distribution characteristics of the lightning activity in China, the optimal selection of the lightning tolerance parameters of the line arrester was proposed: In more thunderstorm regions, middle thunderstorm regions and less thunderstorm regions, where the lightning-to-ground flash density is less than 4.71 times/(km2•a), the line arresters on 10kV distribution line, which has 8/20μs nominal discharge current with 5kA and 4/10μs high current impulse with 65kA, can be chosen; In strong thunderstorm regions and more thunderstorm regions, where the lightning- to-ground flash density is equal to or more than 4.71 times/ (km2•a), the nominal discharge current and high current impulse of these line arresters should be 10kA and 100kA respectively. At the same time, it is recommended to use the entire arrester body as the test product in the high current impulse withstand test to promote the improvement of the production process and reduce the mismatch between the actual lightning withstand performance and the design index of the line arrester. © 2021, Power System Technology Press. All right reserved.

引用

页码：3729 / 3736

页数：7

共 30 条

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