500kV架空地线不同接地方式感应电量的比较

Comparison of Induced Charges with Different Grounding Methods of 500 kV Ground Wires

500 k V输电线路架空地线通常采用一根GJ钢绞地线,一根OPGW光纤复合地线架设方式。研究表明,GJ钢绞地线采用分段绝缘、中点接地方式,OPGW光纤复合地线采用分段绝缘、一点接地方式,既可以限制地线上的感应电压幅值,减小地线感应环流及损耗,具有良好的雷电保护性能。该次研究以浙江金华一条实际运行中500 k V输电线路为对象,结合中国110~750 k V架空输电线路设计规范（GB 50545—2010）、电力行业标准光纤复合架空地线（DL/T 832—2003）以及制定中的110~500 k V交流输电线路架空地线接地技术的新标准,采取EMTP-ATP软件仿真计算的方法,对该500 k V架空地线目前实际采取的以及可能采取的多种接地方式进行了感应电压、感应环流、能量损耗的综合研究、比较。为超高压输电线路架空地线接地方式的优化提供了理论依据。

500 kV overhead transmission lines usually use double ground wires, for one is GJ ground wire,the other is OPGW（operticalfible composite overhead ground wire）ground wire. Previous study has proved that segmented insulation with middle point grounding of GJ ground wire and segmented insulation with one-point grounding of OPGW can not only limit induced voltage, induced current, and power loss,but also have reliable performance of protecting from lightening. The model of one actual 500 kV transmission line of Jinghua in Zhejiang province is set up by EMTP, connecting to State standard（GB 50545—2010）and the standard of the power industry（DL/T 832—2003）to study and compare the induced voltage, induced current and power loss of ground wires with different grounding methods. What is more,it will be the evidence to improve the grounding methods of ground wire.