±800 kV换流站接地极对金属围栅转移电位的影响及治理方案

Effects of±800 kV Converter Station Earth Electrode on Transfer Potential of Metal Fence and Treatment Schemes

为了解决青海海南换流站青稞羊接地极极址上部金属围栅转移电位超标问题,以青稞羊接地极实测土壤电阻率为基础,结合极环设计方案,通过建立仿真模型的方法,研究了不同工况下极址表面电位分布对金属围栏转移电位的影响。研究结果表明,金属围栅的转移电位不仅与入地电流大小相关,而且与冻土关系密切,针对研究结果,提出了两种不同思路的转移电位治理方案,为后续工程中金属围栅转移电位设计及施工提供参考和借鉴。

In order to solve the problem of excessive transfer potential of the metal fence on Qingkeyang ground electrode site of the Hainan converter station in Qinghai,based on the measured soil resistivity of Qingkeyang ground electrode and the design of the pole ring,a simulation model is established to study the influence of the surface potential distribution of the pole site on the transfer potential of the metal fence under different working conditions.The research results show that the transfer potential of the metal fence is not only related to the current into the ground,but also closely related to the frozen soil.According to the research results,two different schemes of the transfer potential treatment plan are proposed,which may be referenced for design and construction in the subsequent project.