Grounding fault location method of overhead line based on dual-axis magnetic field trajectory

Protection and Control of Modern Power Systems

Original Research

Liang Guo¹  Jie Gao²  Zhenfeng Liang³  Xiaowei Wang³  Weibo Liu³  Huan Du³  Xiangxiang Wei⁴ 

[1] Jiangxi Electric Power Research Institute of State Grid, 330000, Nanchang, China;School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, China;School of Electrical Engineering, Xi’an University of Technology, 710048, Xi’an, China;Technische Universität Berlin, 10623, Berlin, Germany;

关键词: Magnetic field;    Fault location;    Lissajous figure;    Distribution network;   

DOI  :  10.1186/s41601-023-00276-z

 received in 2022-05-21, accepted in 2023-01-03,  发布年份 2023

来源: Springer

【 摘 要 】

To address the challenges in fault location in distribution networks, the distribution of magnetic field under overhead line and its relationship with three-phase currents are explored in this paper. At the same time, considering the influence of sensor installation position, line sag and galloping on magnetic field, a grounding fault location method of an overhead line based on dual-axis magnetic field trajectory is proposed. The analytical expressions of the magnetic field on the x-axis and y-axis under the overhead line are obtained by least squares fitting. The Lissajous figure synthesized by dual-axis is then compared with the general equation of an ellipse, and the characteristic quantity expression characterizing the magnetic field trajectory structure is obtained. Finally, a fault location criterion is constructed using the difference of the characteristic quantities of the ellipses synthesized by x-axis and y-axis magnetic fields upstream and downstream of the fault point, i.e., the difference of the length of the major axis and the minor axis, and the sign for the ratio of the cosine value of the inclination angle. Compared with other location methods based on electrical quantity, the principle of this method is simpler and it can locate faults more quickly and accurately. A large number of simulation results show that the proposed method is suitable for different types of fault conditions.

【 授权许可】

CC BY   
© The Author(s) 2023

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