串联玻璃绝缘子改善复合绝缘子电场的研究与应用

Study and Application of the Series Connection of Glass Insulator to Improve the Electric Field Distribution on Composite Insulator

复合绝缘子的结构特点导致其电位分布不均匀,两端金具附近具有强电场区。随着电压等级和复合绝缘子结构高度的增大,这种现象愈加严重。强电场将导致外绝缘介质和金具表面发生电晕放电,降低绝缘子的运行寿命,对电力安全运行造成严重威胁。笔者通过在复合绝缘子导线侧串联玻璃绝缘子的方法降低了复合绝缘子导线端承受的电压,消除了畸变电场,改善了复合绝缘子端部的电场分布,并推荐了不同电压等级的复合绝缘子导线侧需串联的玻璃绝缘子片数。

The strong electric field near the end of composite insulator metal fitting is caused by the asymmetrical electric field distribution for the configuration characteristic,which becomes higher and higher with the increase of the voltage level and the length of insulator.The insulator life-span is reduced by partial discharge on the insulation material and the surface of the metal electrodes which is harmful to the safe operation of the power system.The results show that by this means,the voltage applied on the composite side of composite insulators is lowered;distorted electric field is eliminated;the electric field distribution in the ends of composite insulators is improved.Finally,this thesis recommends the number of glass insulators which should be installed in the high voltage side of composite insulators at different levels.