【摘要】 利用抵消场法计算雷击杆塔顶部时对线路造成的感应过电压,给出了线路感应过电压完整的波形。指出上升先导是制约感应过电压变大的重要因素。通过波形比较指出雷击杆塔时注入分量与感应分量峰值并非同时到达,感应分量峰值滞后于雷电流波头时间约0.8μs,感应分量占总过电压的比重随雷电流波头时间增加而逐渐变大,计算雷击塔顶反击过电压不宜将感应分量和注入分量两者简单叠加。通过计算得出雷电流的波头时间、主放电速度不是影响感应过电压最大值的敏感性因素。更多还原

【Abstract】 In this paper the induced over-voltage on transmission lines caused by lightning strike to tower is calculated based on Wagner Field –Cancellation Method. It points out that the upward pilot streamer is the main factor which can restrain the increase of induced over-voltage. By the comparison of induced over voltage waveform, it is found that the peak values of induced component and injected component across the insulators do not arrived at the same time. The peak-point-time of induced component lags the wave front time of lightning current about 0.8μs. The proportion of the induced component in total over-voltage increases with the wave front time rises. As a result, the calculation of the back flashover is not a solution that simply superimposes the induced component and injected one. The calculation results indicates that the wave front time and main discharge speed of lightning current is not the sensitive factors influencing the maximum value of induced over-voltage.更多还原