棒-板间隙操作冲击放电电压的海拔校正

目前我国有越来越多的输电工程都途经高海拔地区,如何对间隙放电进行海拔校正是工程设计中需要着重考虑的一个因素。为了更深入研究海拔高度对棒-板间隙操作冲击放电特性的影响,在北京、贵阳、西宁和羊八井进行了棒-板间隙操作冲击放电特性试验,根据试验数据,对目前常用海拔校正方法的校正结果进行了比较分析。同时,也利用其它校正方法对试验数据进行了校正,包括3种插值方法以及校正参数随间隙距离变化的2种校正方法。可以得出,现有海拔校正方法不适用于0～4300m海拔高度范围棒-板间隙的海拔校正,线性插值方法和校正参数随间隙距离变化的海拔校正方法误差较小,工程设计中推荐采用这2种方法。

Altitude Correction of Switching Impulse Flashover Voltage of Rod-plane Air Gap

Because more and more transmission projects will pass through high altitude areas,it is important to study altitude correction method for air gap discharge.To deep study the influence of altitude on switching impulse characteristics of rod-plane gap,we experimentally investigated positive switching impulse flashover in Beijing,Guiyang,Xining and Yangbajing,and compared test results with correction results using existing altitude correction methods.Meanwhile,other correction methods were discussed,including three interpolation methods,and two correction methods whose coefficients change with gap distance.It is concluded that,existing correction methods are not suitable for altitude correction of rod-plane air gap discharge in the range of 0~4300 m.The correction errors of linear interpolation method and altitude correction method whose coefficients change with gap distance are small,and these two methods are recommended to be used in project design.