Influence of Temperature and Positive Voltage on Surface Charge Accumulation for the Disc Insulator of GIL Under DC Voltage

被引：0
|
作者：
Yan W. [1 ]
Zhang Z. [1 ]
Deng B. [1 ]
Zhang Z. [1 ]
机构：
[1] College of Electrical Engineering, Shanghai University of Electric Power, Shanghai
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 12期
基金：
中国国家自然科学基金;
关键词：
DC-GIL; Disc insulator; Electric field strength on surface; Surface charge accumulation; Temperature;
D O I：
10.13336/j.1003-6520.hve.20191125014
中图分类号：
学科分类号：
摘要：
Surface charge accumulation on disc insulator of GIL under DC voltage is one of the main factors leading to the reduction of flashover voltage of the insulator. Consequently, we investigated the characteristics of surface charge accumulation on disc insulator of GIL under different temperatures and voltages. Based on the nonlinear relationship between the current density of the gas and the field strength, the solid conductivity of the disc insulator and the temperature, we established a time-varying mathematical model of the surface charge accumulation of the insulator, and investigated the characteristics of surface charge accumulation on disc insulator at different temperatures and the dominant mechanism of the surface charge accumulation on the insulator at different voltages, respectively. Results show that the electric conduction within the gas volume dominates the accumulation when a 1 kV DC voltage is applied, and the surface charge density decreases with increasing temperature; however, the electric conduction through the insulator volume dominates the accumulation when a 400 kV DC voltage is applied, and the surface charge density increases with the increase of temperature. In addition, the effect of surface charge accumulation on the tangential electric field on insulator surface under 400 kV voltage is studied. Results show that the maximum tangential electric field strength of the upper and lower surfaces of insulators increases gradually with the process of surface charge accumulation from initial to steady state, and the higher the temperature is, the greater the maximum tangential electric field strength at steady state will be. Therefore, surface charge accumulation is one of the main factors that increase the electric field strength along the surface of insulators. Temperature aggravates the degree of surface charge accumulation, which further increases the tangential electric field strength. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：3889 / 3897
页数：8
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