500kV交流输电线路组合绝缘配置研究

为给500 kV复合绝缘子两端安装玻璃绝缘子的组合绝缘配置方式的工程设计和应用提供参考,采用有限元法建立了考虑复合、玻璃2种绝缘子实际尺寸的三维静电场有限元模型,研究了组合绝缘子串沿串电压分布,同时采用静电电压表在试验室内进行了组合绝缘子串的电压分布测量试验.计算和试验结果表明,高压端安装5片玻璃绝缘子、芯棒连接处和接...

Study on Combined Insulation Configuration of 500 kV AC Transmission Line

In order to provide reference for insulation engineering design and application,the voltage distribution of a combined insulation in EHV transmission lines was studied for glass insulators installed at both end of a composite insulator.Three-dimensional finite element models of electrostatic field were established to compute the voltage distribution referring to the actual shape of composite and glass insulators,and static voltmeter was used to measure the voltage distribution in laboratory.The comparison of results showed that the combination with five pieces of glass insulator installed at high voltage side,and grading rings installed at joint and low voltage side can effectively improve the voltage distribution of composite insulators,with the voltage percentage of the junction reduced from 28% to 12%.