Experimental Research of Influence of Condensation on Flashover Characteristics of Silicone Rubber Surface

被引：0
|
作者：
Liu X. [1 ]
Hu Y. [1 ]
Li Y. [2 ]
Sun W. [3 ]
Zheng L. [1 ]
机构：
[1] School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi Province
[2] State Grid Sichuan Electric Power Research Institute, Chengdu, 610072, Sichuan Province
[3] China Energy Engineering Group Jiangsu Power Design Institute Co., Ltd., Nanjing, 211102, Jiangsu Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 08期
关键词：
Composite insulation; Condensation; Flashover voltage; Pollution degree; Relative humidity; Temperature difference;
D O I：
10.13335/j.1000-3673.pst.2018.1871
中图分类号：
学科分类号：
摘要：
Composite insulators are widely used in transmission lines, especially in overhead lines due to their excellent surface hydrophobicity and good performance against pollution flashover. Some composite insulators are used in large-span and long-distance transmission lines usually in mountainous areas with large temperature difference between day and night and high humidity. At that time, the surface of composite insulators usually has serious condensation, causing increase of flashover probability. This paper established an experiment platform of condensation to investigate the influence of the factors, such as temperature difference, relative humidity and pollution degree, on surface condensation. With increase of temperature difference, humidity and pollution degree, the weight of condensation increased, and especially in high-humidity environment, the weight of condensation had a significant increase trend. In addition, three typical forms of condensation were proposed. Finally, with the established experiment platform of condensation flashover, the effects of condensation on flashover voltage of composite insulation were obtained. The experimental results revealed that the trend of the influence is similar to pollution flashover, and the main difference lies in the unique wetting process of the contaminated layer before flashover. It is more sensitive to changes in environmental factors and easy to reach flashover conditions. © 2019, Power System Technology Press. All right reserved.
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页码：3047 / 3054
页数：7
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