绝缘地线的感应电压研究

Research on Induced Voltage of Insulated Ground Wire

当输电线路运行时,绝缘地线将产生工频感应电压,该感应电压对运维检修和地线绝缘间隙有较大影响。为此,建立500 kV单回架空线路的地线感应电压仿真计算模型,计算地线全线绝缘、地线全线绝缘(单点接地)、地线绝缘(沿线设有效接地点)3种情况下的感应电压,分析线路长度、输送容量、接地点等对感应电压的影响,并提出降低感应电压的有效措施。

During the operation of transmission lines,the insulated ground wire will generate power frequency induced voltage,which has a significant impact on operation and maintenance,as well as the insulation gap of the ground wire.Therefore,establish a simulation calculation model for the induced voltage of the ground wire of a 500 kV single circuit overhead line,calculate the induced voltage under three conditions:Full insulation of the ground wire,full insulation of the ground wire(single point grounding),and insulation of the ground wire(with effective grounding points along the line),analyze the influence of line length,transmission capacity,grounding point,etc.on the induced voltage,and propose effective measures to reduce the induced voltage.