组合空气间隙交流击穿电压计算方法研究

典型空气间隙的击穿电压特性是外绝缘设计的重要依据,为研究电位悬浮体对空气间隙击穿电压的影响,文中以简化的组合间隙放电模型为研究对象,实验研究了悬浮导体长度和高压电极形状对组合空气间隙击穿电压的影响特性和变化曲线。基于实验数据和观测到的放电现象,文中在考虑子间隙的击穿顺序和流注通道压降的基础上,建立了组合间隙击穿电压的计算模型。利用该模型对含有电位悬浮导体的组合间隙击穿电压进行了计算,结果表明,文中提出的计算模型得到的击穿电压计算值和实验数据相比,相对误差小于5%,说明该方法对于计算含有电位悬浮导体的组合空气间隙击穿电压具有一定的适用性。

Study on the Calculation Method of AC Breakdown Voltage of Complex Air Gap

The characteristics of breakdown voltage of typical electrode is important for the design external insulation.In order to study the influence of floating conductor on air gap breakdown voltage,this paper study on the model of complex air gap.The characteristics of complex air gap breakdown voltage which connected with the length of floating conductor and high voltage electrode shapes are obtained.On the basis of experimental data and appearance of discharge,a calculation model is established by considering the sequence of sub-gap discharging and voltage drop of streamer channel.Using this model,the paper calculates the breakdown voltage of air gap with a floating conductor,the study shows that the relative error between the calculated values of breakdown voltage and experimental data is less than 5%.The study verifies the validity of this way within a certain range of calculate the breakdown voltage of air gap with a floating conductor.