摘要
针对高土壤电阻率地区变电站设备场区跨步电压和接触电压偏高的问题,基于接地分析软件CDEGS数值计算,对某110kV半户内式GIS变电站接地网进行了优化设计。通过仿真计算,提出在高土壤电阻率地区,GIS变电站水平接地网采用双层设计,并利用长垂直接地极降低变电站接地电阻,在GIS变电站接触电压偏高的区域加设帽沿式均压带以降低接触电压。通过对比加设帽沿式均压带前后接地网的接触电压和跨步电压,分析了帽沿式均压带的导体埋深、间距、长度及均压带形状等因素与均压效果的关系。通过分析计算,提出了合理选择和布置均压带的方法,并给出了GIS变电站接地网优化设计方案。
Aiming at problem of high step voltage and touch voltage in equipment area of substation located in the region with high soil resistivity, the optimal design of a 110 kV GIS substation grounding grid is carried out based on grounding analysis software CDEGS. By simulation calculation, it is proposed to use double-decked horizontal grounding grid in high soil resistivity area, and to use long vertical grounding electrodes to reduce grounding resistance. In order to reduce the voltage level, bongrace type uniform voltage band is needed at the areas of high touch voltage. In addition, the dependence of grading effect on buried depth, conductor spacing, conductor length, and shape is analyzed by comparing of touch voltage before and after laying the bongrace type uniform voltage band. Through analysis of the calculation results, a reasonable method to choose and install the bongrace type uniform voltage band is proposed and an optimal design scheme of grounding grid of GIS substation is provided.
出处
《电瓷避雷器》
CAS
北大核心
2017年第5期25-30,共6页
Insulators and Surge Arresters
基金
中央高校基本科研业务费专项资金资助(编号:2014MS90)
关键词
帽沿式均压带
局部均压
接触电压
接地网
bongrace type uniform voltage band
local voltage equalization
touch voltage
grounding grid
