Lightning overvoltage suppression method based on magnetic ring for transmission line

被引：0
|
作者：
Zhou L. [1 ]
Hu C. [1 ]
Huang L. [1 ]
Wang D. [1 ]
Wu T. [1 ]
Zhang D. [1 ]
Chen S. [2 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
[2] Foshan Power Supply Bureau, Guangdong Power Grid Co., Ltd., Foshan
来源：
Dianli Zidonghua Shebei/Electric Power Automation Equipment | 2022年 / 42卷 / 06期
关键词：
ATP/EMTP; Lightning overvoltage; Lightning protection; Magnetic ring; Transmission line;
D O I：
10.16081/j.epae.202203027
中图分类号：
学科分类号：
摘要：
A method based on magnetic ring suppression is proposed for lightning protection of transmission line. Firstly, the magnetization function of magnetic ring material is obtained by curve fitting, and then the flux calculation model of magnetic ring is established based on infinitesimal method and electromagnetic field theory calculation. The rationality of the flux calculation model is verified by FEM(Finite Element Method). Then, the electromagnetic transient model of the magnetic ring is established in ATP/EMTP by combining the flux calculation model of magnetic ring, and the influence of different magnetic ring materials, magnetic ring cross sections, magnetic ring lengths and magnetic ring shapes on the effect of lightning overvoltage suppression is analyzed. The simulation of the proposed method is carried out based on a typical 110 kV transmission line. The simulative results show that the maximum error between the calculative results of flux calculation model and the FEM is less than 5 %, which verifies the rationality of the proposed method. The increase of the cross section and length of the magnetic ring can enhance the suppression effect, but the saturation pheno-menon will appear when the outer radius and length reach 60 mm and 6 m respectively. The result of field test show that after the magnetic ring is installed, the lightning overvoltage can be effectively reduced, and the maximum error between simulative and testing results is 5.92 %, which verifies the correctness of the proposed flux calculation model and electromagnetic transient model of the magnetic ring and the feasibility of the proposed lightning overvoltage suppression method based on magnetic ring. © 2022, Electric Power Automation Equipment Press. All right reserved.
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页码：186 / 191and198
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