石墨接地体加接地布的接地阻抗特性研究

Research on ground impedance characteristics of graphite ground body plus ground cloth

接地电阻是衡量电力系统稳定性的重要参数。若接地系统埋在与电极接触不良的土壤中,简单石墨接地装置在复杂土壤环境中的降阻效果一般,难以达到工程要求。在接地装置的降阻原理的基础上提出用于增大散流面积的接地布降阻方法,并设计接地装置加接地布的接地方案。首先进行了仿真分析,在模拟试验平台中进行了石墨接地装置加接地布的接地实验,重点测量了接地布位置、埋设深度和冲击电流幅值对接地布降阻效果的影响。通过模拟试验和有限元仿真的对比研究接地电阻的变化情况,总结分析了各因素对于接地阻抗的影响规律,提出利用接地布降低接地电阻的辅助散流方案,为降低接地电阻提供参考。

Grounding resistance is an important parameter to measure the stability of power system.If the grounding system is buried in the soil with poor contact with the electrode,the resistance reduction effect of simple graphite grounding device in complex soil environment is general,which is difficult to meet the engineering requirements.conditions.Based on the principle of reducing resistance of grounding device,puts forward a method of reducing resistance of grounding cloth to increase the area of stray current,and designs a grounding scheme of grounding device plus grounding cloth.Firstly,the simulation analysis is carried out,and the grounding experiment of graphite grounding device with grounding cloth is carried out in the simulation test platform.Several factors such as the location of grounding cloth,the depth of embedding and the amplitude of impulse current are mainly measured.Through the comparison of simulation test and simulation,the change of grounding resistance is measured,the influence law of various factors on grounding resistance is summarized and analyzed,and the auxiliary current dispersion scheme of using grounding cloth to reduce grounding resistance is proposed,which provides reference for reducing grounding resistance.