随着输电线路电压等级的不断升高，基于行波原理的故障测距和超高速线路保护已经成为目前研究的热点。通 过对接地故障时零模和线模行波传输规律的分析，得出以下结论：1）零模检测波速度和波头李氏指数之间具有特定对应关系；2）零模和线模行波分量传输时间差与传输距离之间具有单调非线性递增关系；3）阻波器对零模和线模电压行波分量的影响不同，模量传输时间差在区内末端和区外出口故障时具有突变特性。根据以上分析，利用小波变换和BP神经网络技术，导出了基于零模和线模传输时间差的接地故障测距、单端量保护新算法，并利用ATP中考虑频散特性的线路模型进行了仿真，仿真结果证实了上述算法的有效性。

With the transmission line voltage class escalating, ultra-high speed protection becomes the hot spot in the current researches. Through analyzing zero mode and traveling wave propagation rule after ground fault occurring, the follows conclusions are drawn: 1) The zero mode detected wave velocity has relationship with wave head Lipschitz exponent; 2) There is nonlinear ascending relationship between propagation distance and the propagation time difference of zero mode and aerial mode; 3) Obtain the changing rule of the propagation time gap between zero mode and aerial mode when ground fault occurs in front and rear of line trap. From the above analysis, using wavelet transform and BP neural network technology, a new fault location and protection algorithm based on zero mode and aerial mode traveling wave was proposed. The effectiveness of the arithmetic was verified by the ATP simulation results.