Aiming at the error caused by double-end data unsynchronization and parameter uncertainty of power transmission line and at the location inaccuracy of the single-ended method

this paper proposes a windowed wavelet packet transform method and applies it to the travelling wave fault location via combining it with the double-ended location principle.The window-wavelet packet transform of the traveling wave signal can locate the singular point of the signal quickly and accurately to avoid the error caused by instable wave velocity

improve the recognition accuracy of the wave head

and realize the fault location of transmission line easily and quickly.A fault model is built in PSCAD

and MATLAB tool is employed to simulate the model.The result shows that the traveling wave location using the windowed wavelet packet transform can accurately extract the head position of the traveling wave signal and gain higher loc ation accuracy.Compared with the windowed wavelet

the proposed algorithm has higher loc ation precision.