Characteristic Parameters of Electric Field Along the Surface Affecting the Flashover Voltage of GIS Pillar Insulators

被引：0
|
作者：
Liu L. [1 ]
Li X. [1 ]
Zhang R. [1 ]
Wen T. [1 ]
Zhang Q. [1 ]
Li Z. [2 ]
机构：
[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an
[2] China Electric Power Research Institute, Beijing
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 09期
基金：
国家重点研发计划;
关键词：
Electric field distribution; Electric field features; GIS; Pillar insulators; SF[!sub]6[!/sub; Surface flashover;
D O I：
10.13336/j.1003-6520.hve.20190831007
中图分类号：
学科分类号：
摘要：
Optimization of the electric field distribution along the insulator surface can effectively improve the flashover voltage of insulators, but the characteristics of the electric field distribution which determine the flashover voltage of insulators are still unclear. In order to further study the characteristics of the electric field distribution along the flashover voltage of insulators, 48 kinds of epoxy pillar insulators with different electric field distributions along the surface were obtained by adjusting the geometrical parameters of the insulator's surface shape, embedded electrode and external shielding electrode. The static electric field distribution of the samples was calculated by finite element method. The maximum, average, gradient, square integral and potential distribution of the electric field along the surface and its tangential, normal components were obtained by post-processing. The flashover voltages of the samples immersed in 0.2 MPa SF6 were measured experimentally under a standard lightning voltage. By studying the correlation between flashover voltage and electric field distribution, it is found that the flashover voltage of insulators is not only related to the distribution of electric field along the surface, but also significantly related to the distribution of tangent and normal components of electric field. After screening, the characteristic parameters which are related to the flashover voltage and are independent of each other are obtained as follows: the maximum value of the electric field along the surface and its normal component, the field inhomogeneity and maximum gradient of the tangential component of the electric field along the surface, the integral of the area where the tangential component of the electric field along the surface is greater than 90% of its maximum value. Moreover, the influence mechanism of these characteristic parameters on the flashover initiation and development process is also qualitatively analyzed. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：2740 / 2747
页数：7
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