High precision location of cable faults based on chirp-Z transform
WU Meisheng1, YUAN Chao2, HU Liwen1, BIN Feng1
1. School of Physics and Electronic Science, Changsha University of Science and Technology, Changsha 410114; 2. School of Electrical and Information Engineering, Hu’nan University, Changsha 410082
Abstract：In order to solve the problem of high redundancy and low positioning accuracy of traditional cable fault location spectrum data, this paper proposes a high precision cable fault location method based on chirp-Z transform (CZT). Firstly, according to the transmission line theory, the distribution parameters and reflection coefficient characteristics of the fault cable are analyzed. Then, CZT is performed on the real part of the reflection coefficient. Finally, iterative filtering is used to denoise and obtain the cable fault location spectrum. The results show that the fault point recognition error of the proposed method is 0.025%~0.275%. Compared with fast Fourier transform (FFT), the proposed method has the advantages of refined location spectrum, high resolution, low redundancy and high fault location accuracy.
2025, Vol. 26 
