±1100kV换流站直流母线导体选型与布置研究

Study on Conductor Selection and Layout of DC Polar Bus in ± 1 100 kV UHVDC Converter Station

±1 100kV特高压直流输电工程在工程应用中属于新的电压等级,对于换流站内直流母线的选型与布置在参考±800kV换流站的基础上做进一步的研究分析。针对±1 100kV直流极线户内布置的方案,对3种备选直流管母线(6063G-Φ400/380、6063G-Φ450/430、6063G-Φ500/480)进行了电磁环境的校核计算,并结合目前±1 100kV设备外形对导体的布置提出了推荐意见。研究结果表明:3种备选管母在对地高度15~25 m的范围内均不起晕,地面离子流密度以及磁感应强度满足相关规程规范要求;在对地高度不小于18 m时,3种管母线地面合成场强均小于25kV/m;管母线跨距不大于15 m的布置形式能满足管母线的破坏应力及挠度要求。综合考虑运行的安全可靠性以及工程的经济性,推荐采用6063G-Φ400/380管母线作为±1 100kV直流母线,并建议管母线对地高度不小于18 m,且管母线跨距不大于15 m。

±1 100 kV UHVDC transmission projects belong to a new voltage level in engineering applications,and the selec-tion and arrangement of DC polar bus can refer to 土 800 kV converter station,which needs a further research and analysis. For the indoor layout scheme of ± 1 100 kV polar line,the checking calculation is carried out for electromagnetic environment of three tube buses （6063G - 0500/480, 6063G - 0450/430 and 6063G - 0400/380） , and the recommendations are given for the arrangement of tube bus combined with the current 土 1 100 kV equipment size. The results indicate that, for these three alternative tube buses,corona would not appear when their height above ground is between 15 ？25 meters as well as the ground ion current density and magnetic induction would meet the requirements of relevant standards and regulations. The earth resultant electric field of each bus should be less than 25 kV/m when their height above ground is more than 18 m. Be-sides, the requirements of failure stress and deflection would be met when the conductor span is less than 15 m. Therefore, considering the safety and reliability of operation and the engineering economics, 6063G -0400/380 tube bus is recommen-ded as ± 1 100 kV polar bus,and it is also recommended that the height should be more than 18 m and the layout span of bus should be less than 15 m.