Breakdown voltage characteristics of combined air gaps under negative lightning impulse

被引：1

作者：

Wu, Shaocheng ^{[1
,2
]}

Wang, Linong ^{[1
,2
]}

Gao, Jiachen ^{[1
,2
]}

Xie, Cheng ^{[1
,2
]}

Song, Bin ^{[1
]}

Peng, Yong ^{[2
]}

Liu, Jianben ^{[2
]}

Liu, Yan ^{[2
]}

机构：

[1] Wuhan Univ, Sch Elect Engn & Automat, Wuhan 430000, Peoples R China

[2] State Key Lab Power Grid Environm Protect, Wuhan 430076, Peoples R China

来源：

ENERGY REPORTS | 2022年 / 8卷

关键词：

Combined air gaps; Negative lightning impulse; Breakdown voltage; Breakdown timing; DISCHARGE CHARACTERISTICS;

D O I：

10.1016/j.egyr.2022.08.047

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Long air gaps are the main external insulation medium of overhead transmission lines. When there are floating conductors in the air gap, the gap's configuration changes, and the combined air gaps is formed. We built an experimental platform to obtain the breakdown characteristics of a 2 m rod-plane air gap with a rod floating conductor in different positions under negative lightning impulse. The results show that as the distance between the floating conductor and the high voltage conductor changes, the breakdown voltage (BV) and timing change. Moreover, the breakdown voltage increases with the length of sub-gap 1, showing a trend of first increasing, then decreasing, and then increasing, which is different from the trend under positive lightning impulse. The reason for this phenomenon is inferred from the analysis to be related to the polarity effect. (C) 2022 Published by Elsevier Ltd.

引用

页码：1230 / 1236

页数：7

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