同走廊多回特高压直流线路对在建线路的感应电影响研究

  目的]  多回电力线路同走廊架设可以避免对土地资源的分割，降低对地方规划和发展的影响，但是同走廊内先期运行的线路会在后建线路导地线架设时产生感应电，影响施工安全。  方法]  针对同走廊内多回特高压直流线路对一在建的直流线路上产生的感应电进行了理论分析和仿真研究，对影响因素包括直流运行方式、线间距离、放线长度等进行了分析。  结果]  仿真结果表明:相邻直流线路在在建线路上产生了较高的静电感应电压，且受运行方式影响显著；线间距减小时，静电感应电压迅速增加；带电线路的离子流通过施工设备产生的电流对人体基本无影响；施工架线时相邻带电线路产生的感应电压需要特别关注，并对导线和设备做良好接地。  结论]  研究成果对电力线路邻近带电线路施工架线具有指导意义。

Influence Research on Induced Voltage of Multi UHVDC Transmission Lines to the Power Line Under Construction in the Same Corridor

  Introduction]  Multi power transmission lines arranged in the same corridor could avoid the land division and reduce the adverse effect on the local planning and development, but the personal safety of operators in the process of towers and conductors erection of subsequent power lines should be seriously considered as a result of induced voltage of the previous energized transmission lines.  Method]  One DC transmission line under construction was taken as an example, electrostatic induced voltage generated from multi UHVDC transmission lines nearby in the same corridor were studied and calculated. The influence factors including the operating mode of UHVDC lines, line spacing from the energized power lines and length of stringing conductors were analyzed at the same time.  Result]  The results show that the induced voltage got significantly high from adjacent UHVDC lines, and operation mode of energized lines played an important part; the less line spacing reduce, the higher induced voltage reach; the steady-state current from ion current density generated by UHVDC lines flowing through construction equipments have nearly less impact to constructors. Induced voltage of the stringing conductors will be paid much attention to when stringing and conductors and equipments should be grounded effectively.  Conclusion]  The research results also have guiding significance to power lines′ construction which be adjacent to live lines.