Xiuyu GuoThis email address is being protected from spambots. You need JavaScript enabled to view it.1, Caixia Tao1, Taiguo Li1, Qiang Zhuo1, and Xu Bai2

1School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lan Zhou, China
2Chengdu Metro Operation Co. Ltd Chen Du, China


Received: July 18, 2022
Accepted: March 4, 2023
Publication Date: March 23, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202312_26(12).0005  

Due to the discontinuous wave impedance, uneven line parameters, and complex and changeable fault transient traveling waves of overhead-cable hybrid transmission lines, the traditional double-ended traveling wave ranging method will produce large errors. Aiming at this problem, this paper proposes a fault location method for multi-point hybrid transmission lines based on Hilbert-Huang transform (HHT). First, the effective identification of the traveling wave head is completed at both ends of the line and at the connection point between the overhead line and the cable line, and then the HHT is used to extract the time when the fault traveling wave head reaches the measurement point, and finally it is substituted into the multi-point ranging equation to calculate the fault. The result of the ranging. The simulation results of MATLAB/PSCAD show that the method proposed in this paper avoids the influence of traveling wave velocity on the ranging accuracy, and is not affected by the line structure. Compared with the traditional double-ended ranging method, its ranging accuracy is higher. At the same time, it can also meet the requirements of engineering practice positioning accuracy within 200m.

Keywords: able-overhead line hybrid transmission line; Hilbert-Huang transform (HHT); fault location; traveling wave

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