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Title: A new method for improving flashover and leakage characteristics of line insulators
Other Title: 提高线路绝缘子防污闪及抗泄漏性能的新方法
Authors: Li, X
Li, ZY
Chen, J
Wang, Y
Zhang, G
Macalpine, JMK
Issue Date: 2001
Source: 電網技術 (Power system technology), Oct. 2001, v. 25, no. 10, p. 69-72
Abstract: 文章介绍了通过在传统的瓷质或玻璃线路绝缘子的铁帽底部加装一表面覆盖硅橡胶的金属环 片的新方法,可以使绝缘子表面电场分布更均匀,以提高起晕和闪络电压;使电场方 向更垂直于绝缘子上表面,以抑制放电的发展;同时金属环片外 表面覆盖的具有良好防污性能的硅橡胶材料可以极大地增加爬电距离,降低泄漏电流和提高 闪络电压。实验结果和理论分析相吻合,证实了采用该方法改进后的新型绝缘子的优良性 能。经10克/升的氯化钠溶液充分浸泡后,新型绝缘子的干污闪电压比普通绝缘子至少提高 了170%,起晕电压提高了近70%,泄漏电流减少了近30%。
In this paper a new method is described in which an annular metal sheet coated with silicone rubber is added at the base of the conventional insul ator cap to improve the insulator unit's performance under both clean and pollut ed conditions. The annular metal sheet is connected to the insulator iron cap an d makes the electric field distribution more uniform, which increases the corona onset voltage. The annular metal sheet also makes the electric field direction on the insulator upper surface approximately perpendicular to the insulator surf ace, rather than parallel, as on the conventional insulator, therefore the devel opment of the discharge is restrained. At same time, the annular coated with sil icon rubber which possesses good pollution-proof performance can increase the c r eepage distance, reduce leakage current and raise the flashover voltage. The exp erimental results obtained coincide with the results of theoretical analyses. Th e fine performance of novel insulator is approved. After fully immersing the nov el insulator into the sodium chloride solution at density of 10g/l, its flashov er voltage is multiplied, the corona onset voltage increased more than 70% and t he leakage current decreased nearly 30% under the same polluted conditions. 还原
Keywords: Line insulator
Pollution flashover
Leakage current
Publisher: 中國學術期刊(光盤版)電子雜誌社
Journal: 電網技術 (Power system technology) 
ISSN: 1000-3673
DOI: 10.13335/j.1000-3673.pst.2001.10.016
Rights: © 2001 中国学术期刊电子杂志出版社。本内容的使用仅限于教育、科研之目的。
© 2001 China Academic Journal Electronic Publishing House. It is to be used strictly for educational and research purposes.
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