不同金属微粒缺陷下GIS盆式绝缘子表面放电与电场特性研究

Study on surface discharge and electric field characteristics of GIS basin insulator with different metal particle defects

基于表面放电试验与有限元电场仿真方法对金属球/金属丝微粒缺陷下GIS盆式绝缘子表面的放电与电场特性进行研究。结果表明:不同金属微粒缺陷下脉冲电压和紫外光子数均随电压的升高而增大;金属丝缺陷下的盆式绝缘子表面放电更加严重,低压侧存在金属球缺陷时的放电比高压侧存在金属球缺陷时更加剧烈,仿真结果与试验结果变化趋势一致。GIS盆式绝缘子表面存在金属微粒缺陷时,表面的放电强度与电场畸变程度呈正相关,且电场畸变程度与平均脉冲幅值的相关性较大。

On the basis of surface discharge tests and finite element electric field simulation methods,the surface discharge and electric field characteristics of GIS basin insulators with metal ball or wire particle defects were studied.The results show that under different metal particle defects,both the pulse voltage and ultraviolet photon number increase with the increase of voltage.The surface discharge of basin insulators with metal wire defects is more severe,compared to the situation where there are metal ball defects on the high-voltage side,the discharge is more intense when there are metal ball defects on the low-voltage side,and the change trends of simulation results are consistent with the experimental results.When there are metal particle defects on the surface of GIS basin insulators,the surface discharge intensity is positively correlated with the distortion degree of electric field,and the correlation between the distortion degree of electric field and the average pulse amplitude is significant.