变电站接地网冲击性能参数的分析与研究

Analysis and Research on Impact Performance Parameters of Substation Grounding Grid

变电站接地网的接地参数主要包括工频接地电阻、冲击接地电阻等电阻参数及接触电压和跨步电压等电位参数。变电站接地网的研究大多集中于其工频性能参数的研究,包括工频接地电阻、接触电势等参数。但是变电站同样也会遭受雷击等,因此,对变电站接地网的冲击性能参数展开分析具有重要意义。笔者主要利用电力系统接地分析软件CDEGS对变电站接地网进行建模并且对冲击接地电阻的各个影响因素展开仿真及计算,旨在对变电站接地网的冲击性能优化分析提供理论依据。仿真实验结果表明,改变接地网导体的间距及土壤电阻率可以更好地改善接地网的冲击性能。

The grounding parameters of substation grounding grid mainly include resistance parameters such as power frequency grounding resistance and impulse grounding resistance and potential parameters such as touch voltage and step voltage.The research of substation grounding grid mostly focuses on its power frequency performance parameters including power frequency grounding resistance contact potential and other parameters.However substations will also suffer from lightning strikes.Therefore it is of great significance to analyze the impulse performance parameters of substation grounding grid.The author mainly uses the power system grounding analysis software CDEGS to model the substation grounding grid and simulate and calculate various influencing factors of impulse grounding resistance aiming to provide a theoretical basis for the optimization analysis of impulse performance of substation grounding grid.The simulation results show that changing the conductor spacing and soil resistivity of grounding grid can better improve the impulse performance of grounding grid.