摘要
地铁高架桥段由于自身高度的限制使其容易遭受雷电的侵袭,而安装金属氧化物避雷器是较为有效的雷电防护措施,因此有必要研究金属氧化物避雷器对地铁接触轨线路防雷的影响。文中利用电磁暂态仿真程序仿真分析了雷击点位置、金属氧化物避雷器安装方式对接触轨耐雷水平的影响,以及不同桥墩接地电阻条件下金属氧化物避雷器的雷电放电电流和比能量的变化规律。结果表明:雷击避雷带位置为1-5时,桥墩接地电阻对接触轨耐雷水平影响不明显;雷击位置为6时,接地电阻对其耐雷水平影响明显,且逐渐趋于平稳。通过安装金属氧化物避雷器能够明显改善接触轨耐雷水平,并且随着安装密度的增加而增加;而金属氧化物避雷器的放电电流、比能量与接地电阻成正比例关系。同时,对比不同型号的金属氧化物避雷器残压值及比能量值,工程上建议选用残压较小的YH5WS-17/45型金属氧化物避雷器。
To reveal the influence of MOA on lightning protection of metro viaduct section contact rail,the elec-tromagnetic transient simulation program is employed to analyze the effects of lightning stroke position and MOA erection method on the lightning withstand level of the contact rail,and the change rules of lightning discharge current and specific energy of MOA under different grounding resistance of bridge pier are obtained. The results show that: ① at the locations from No.1 to No.5 in the lightning protection belt,the grounding resistance of bridge pier imposes weak effect on the lightning withstand level,but at the No.6 location the grounding resistance imposes a great effect and becomes stable;② erection of MOA can improve the lightning withstand level of the contact rail obviously,and the lightning withstand level rises with the increase in the erection density of MOAs;③ the discharge current and the specific energy of MOA are proportional to the grounding resistance. The YH5WS-17/45 MOA with lower residual voltage is suggested for engineering application.
作者
孙晓东
李瑞芳
曹晓斌
徐超
陈力生
SUN Xiaodong;LI Ruifang;CAO Xiaobin;XU Chao;CHEN Lisheng(Xuchang Power Supply Company of State Grid Henan Electric Power Company,Henan Xuchang 461000,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Metro Operation Co.,Ltd.,Chengdu 610031,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第3期127-133,共7页
High Voltage Apparatus
基金
国家自然科学基金(51507145)~~
