750 kV强耦合并行单回架设线路感应电压和电流研究

交流输电线路采取同塔双回架设方式时，必须对由于回路间电气耦合而产生的感应电压、电流问题进行关注，并对线路的接地开关参数进行合理选择，以确保运行安全。对于2条并行架设的单回线路，当回路间距较近时，其回路问的电磁耦合作用也较强，使得感应电压、电流问题也较为突出，需要采取措施加以限制。目前该问题尚未引起关注，也未开展限制措施研究。依托西北地区某在建的750kV并行单回架设线路，采用EMTP电磁暂态仿真工具对其感应电压和电流问题进行研究，针对其静电感应电压高且超过现有接地开关技术参数的突出问题，提出一种新的线路换位及相序布置方式，可以明显降低感应电压、电流水平，解决接地开关设备选型问题。研究成果为限制超／特高压强耦合并行单回架设线路的感应电压、电流问题提供了一种新的思路，对解决工程实际问题具有借鉴意义。

Research on Induced Voltage and Induced Current of 750 kV Strong Coupling Parallel Single-Circuit Lines

When the AC transmission line adopts the doublecircuit mode, sufficient attention should be paid to the issues of the induced voltage and current resultant from the electric coupling. Meanwhile, parameters of the grounding switch should be chosen carefully to ensure the safety operation of the line. For two parallel-running single-circuit lines, the electricmagnetic coupling function between circuits can be strong when the distance between them is short, giving rise to prominent induced voltage and current issues, therefore proper limiting measures should be taken. However, at present, this issue has yet to draw adequate attention and no research has been conducted in this field. Based on a certain 750 kV parallelrunning single-circuit line under construction in Northwest China, this paper studies the induced voltage and current issue by the EMTP simulation tool, and in view of the outstanding problem of the high electro-induced voltage which often exceeds the present ground swith technical parameters, the paper proposes a new line transposition and phase layout manner, which can reduce the induced vohage and current obviously, and realize the equipment configuration. The research result provides a new concept for suppressing induced voltage and current of the EHV/UHV strong coupling parallel single-circuit lines, and some reference for solving practical problems in projects.