基于CDEGS仿真计算的变电站接地系统设计

Grounding System Design Based on Simulation of CDEGS in Substations

随着接地技术研究的不断深入,接地系统各项指标参数的计算也变得越来越精确。基于CDEGS软件系统中的各个模块对典型变电站接地网设计工作进行整合。首先运用其中RESAP模块的功能对土壤视在电阻率与测量间距之间的关系进行分析计算,建立拟建址地的土壤实际分层结构模型;其次运用FCDIST模块计算故障电流在接地系统以及接入其中的架空地线或者中性线间的分布情况;最后运用MALZ模块对变电站接地系统的安全性进行分析,对各项因素对地表跨步电压分布的影响进行模拟。最终确定该变电站接地网的设计方案,并结合建成的接地网实测接地电阻反演校验仿真计算的准确性。

With the development of grounding technique,parameters calculation of the substation grounding system become more and more precise.The design of grounding system is integrated based on modules of CDEGS software system.Firstly,the soil texture of proposed substation is modeled with the RESAP module.Secondly,distributions of fault current in the grounding system and the overhead earth wire which accessed to the grounding system or neutral point wire are calculated by using the FCDIST module.Thirdly,the security of grounding system is analyzed,and the variation of step voltage with the factors transformation is simulated using the MALZ module.Finally,the final design proposal is confirmed,and the accuracy of simulation is verified by the actual testing of ground resistance.