AC Flashover Performance of Post Insulator With Fan-shaped Non-uniform Pollution

被引：0
|
作者：
Zhang Z. [1 ]
Xiang Y. [1 ]
Qiao X. [1 ]
Jiang X. [1 ]
Wu J. [2 ]
机构：
[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Shapingba District, Chongqing
[2] State Grid Chongqing Maintenance Company, Gaoxin District, Chongqing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 24期
关键词：
AC; Fan-shaped non-uniform pollution; Post insulator; Surface contamination layer conductance;
D O I：
10.13334/j.0258-8013.pcsee.190559
中图分类号：
学科分类号：
摘要：
Affected by certain factors, such as uni- directional wind or landform, post insulator surface will easily get coated with fan-shaped non-uniform pollution. To put it another way, leeward sides of post insulators are usually covered with thicker pollution layers. In this paper, AC artificial pollution flashover tests on porcelain post insulator with fan-shaped non-uniform pollution were carried out under various polluted conditions. The influences of fan-shaped non-uniform pollution on flashover voltage, flashover process, surface layer conductivity of leeward side and surface contamination layer conductance were discussed. Test results indicate that there is a huge distinction between AC flashover performances of post insulator under non-uninform pollution and uninform pollution. The flashover voltage of post insulator with non-uninform pollution is largely influenced by salt deposit density (SDD), the ratio of SDD of windward side to leeward side (Y/B) and the occupation ratio of leeward side k. A reduction of Y/B from 1/1 to 1/8 would give a decrease of 16% in flashover strength. Flashover voltage may rise slightly when the occupation ratio (k) of leeward side increases from 25% to 45%. Uf can still be calculated by a negative exponential function of SDD, and the effect of fan-shaped non-uniform pollution on Uf-SDD relationship mainly lies in changing the proportionality coefficient a rather than the exponent n. A surface contamination layer conductance calculation model of non-uniform polluted insulator was established for further analysis. The theoretical ratio of surface contamination layer conductance under non-uniform and uniform pollution η is calculated by different Y/B and k, which agrees well with experiment data. It is theoretically proved that fan-shaped non-uninform pollution will lead to an increase in surface contamination layer conductance of post insulator, which promotes the arc propagation and flashover process, and finally lowers flashover voltage. © 2019 Chin. Soc. for Elec. Eng.
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页码：7385 / 7393
页数：8
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