| 引用本文: | 周利军,胡琛,黄林,王东阳,吴统帅,张栋,陈斯翔.基于磁环的输电线路雷击过电压抑制方法[J].电力自动化设备,2022,42(6): |
| ZHOU Lijun,HU Chen,HUANG Lin,WANG Dongyang,WU Tongshuai,ZHANG Dong,CHEN Sixiang.Lightning overvoltage suppression method based on magnetic ring for transmission line[J].Electric Power Automation Equipment,2022,42(6): |
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| 摘要: |
| 提出一种基于磁环抑制的方法对输电线路进行雷击防护。首先采用曲线拟合得到磁环材料的磁化函数，进而基于微元法与电磁场理论计算建立了磁环的磁链计算模型，并利用有限元法(FEM)验证磁链计算模型的合理性；然后，利用磁环的磁链计算模型在ATP/EMTP中建立磁环电磁暂态模型，进而分析了不同磁环材料、磁环截面积、磁环长度及磁环形状对磁环抑制雷击过电压效果的影响。基于典型的110 kV输电线路对所提方法进行仿真。结果表明：磁环磁链计算模型与FEM计算结果最大误差低于5 %，验证了所提方法的合理性；增加磁环的截面积和长度能加强磁环的雷击过电压抑制效果，但在外半径、长度分别取60 mm、6 m后出现了饱和现象。现场试验结果表明，安装磁环后，雷击过电压得到了有效的降低，仿真和试验结果之间的最大误差为5.92%，验证了所提磁环磁链计算模型、电磁暂态模型的正确性以及磁环抑制雷击过电压方法的可行性。 |
| 关键词: 磁环 雷击过电压 防雷 ATP/EMTP 输电线路 |
| DOI：10.16081/j.epae.202203027 |
| 分类号:TM86 |
| 基金项目: |
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| Lightning overvoltage suppression method based on magnetic ring for transmission line |
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ZHOU Lijun1, HU Chen1, HUANG Lin1, WANG Dongyang1, WU Tongshuai1, ZHANG Dong1, CHEN Sixiang2
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1.School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China;2.Foshan Power Supply Bureau, Guangdong Power Grid Co.,Ltd.,Foshan 528000, China
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| Abstract: |
| 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. |
| Key words: magnetic ring lightning overvoltage lightning protection ATP/EMTP transmission line |
