变电站接地极电阻建模计算及特征分析  

Modeling calculation of substation grounding resistance and its feature analysis

作　　者：齐晓朋 马俊贵 QI Xiaopeng MA Jungui(Laizhou Meteorological Bureau, Yantai 261400, China Shizuishan Meteorological Bureau, Shizuishan 753000, China)

机构地区：[1]莱州市气象局,山东烟台261400 [2]宁夏石嘴山气象局,宁夏石嘴山753000

出　　处：《现代电子技术》2017年第1期149-151,155,共4页Modern Electronics Technique

摘　　要：在变电站中,为有效预防发生变电站接地故障,利用PSCAD软件搭建某变电站35 k V电网的电阻仿真模型,通过建模计算变电站接地极的电阻大小,并分析其特征,改善变电站接地极电阻设置方案以确保规避变电站接地风险。结果表明,在变电站中,中性点经电阻接地更适用于变电站中性点电阻接地方式,在变电站中,经建模计算其接地电阻理论值是1.28Ω,但在实际中为提升变电站建设的经济性,降低造价成本,可以将电阻设计值定为0.687Ω,同时可以为变电站设置高阻地面以满足实际中变电站安全运行的要求,不仅有利于变电站安全、稳定的运行,也可使变电站运行的安全性提升42.0%。结论证实,通过建模计算变电站接地极电阻,并分析接地极电阻的特征,有助于设计优化方案,预防变电站接地发生,产生积极影响。In order to prevent the substation grounding fauh, the PSCAD software is used to establish the resistance simula-tion model of a certain substation 35 kV power grid. The grounding electrode resistance is obtained by means of the modeling cal-culation, and its features are analyzed. The setting scheme of the substation grounding resistance was improved to avoid the sub-station grounding risk. The results show that the neutral point grounding through the resistance is suitable for the neutral point re-sistance grounding mode in substation. The theoretical value of the substation grounding resistance obtained by modeling calcula-tion is 1.28Ω, and the resistance design value is 0.687% to improve the substation safety operation and reduce the cost. The highresistance ground can be set for the substation to satisfy the requirement of practical substation safety operation, facilitate the sub-station safe and stable running, and the substation running safety is increased by 42%. The conclusion verifies that the modelingcalculation of the substation grounding electrode resistance and the analysis of the grounding electrode resistance features are con-ducive to the design of the optimization scheme and prevention of the substation grounding situation, and have a positive impact.

关 键 词：变电站接地 特征分析 建模计算 接地极电阻 

分 类 号：TN710[电子电信—电路与系统]