摘要
利用CDEGS分析软件对500 kV横沥变电站接地网进行状态评估,从接地网接地电阻、接触电压、跨步电压、土壤电阻率及其结构的角度进行综合分析评估。提出采用将外扩地网与主接地网连接的4根扁钢全部割断以将外扩地网废弃,在主接地网四周安装11口接地斜井并加灌HK-2型物理降阻剂的改造方案,使接地网的接地电阻降到0.377Ω,满足设计的要求,确保变电站的安全运行和人身安全。
Operation condition evaluation of the grounding Grid in 500 kV Hengli Substation is carried out by using CDEGS analysis software, from the point of view of grounding resistance, contact voltage, step voltage, soil resistivity and soil structure, comprehensive analysis is carried out. Reconstruction scheme is proposed that abandon the outside grounding grid through cutting off the four steel flat connected the outside and the main grounding grid, and install 11 grounding shafts with HK-2 type physical resistance reduction agent around the main grounding grid. The grounding resistance can be down to 0.377Ω to meet the design requirement, which can ensure the safety of operation and personal in substation.
出处
《电瓷避雷器》
CAS
北大核心
2011年第3期61-64,共4页
Insulators and Surge Arresters
关键词
变电站接地网
状态评估
接地电阻
substation grounding grid
condition evaluation
grounding resistance
