单相接地故障时考虑架空地线分流的变电站接地网校核  

Verification of Substation Grounding Grid Considering the Shunt of Overhead Ground Wire in Single Phase Grounding Fault

作　　者：伍振园 毛振宇 何森 唐明 王旭明 娄建勇[3] WU Zhenyuan;MAO Zhenyu;HE Sen;TANG Ming;WANG Xuming;LOU Jianyong(Guilin Power Supply Bureau of Guangxi Power Grid Co.,Ltd.,Guilin 541002,China;Zhuhai Huawang Technology Co.,Ltd.,Zhuhai 510382,China;College of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]广西电网有限责任公司桂林供电局,广西桂林541002 [2]珠海华网科技有限责任公司,广东珠海510382 [3]西安交通大学电气工程学院,西安710049

出　　处：《电瓷避雷器》2021年第5期123-127,共5页Insulators and Surge Arresters

基　　金：广西电网有限责任公司资助项目(编号:04030020190301030000007)。

摘　　要：在变电站的实际运行中,当发生线路单相接地故障时,架空地线将会分流部分故障电流,故在CDEGS中建立了变电站A及其连通的3座变电站,形成电力系统模型,仿真得到了变电站A在运行过程中单相接地故障时的入地电流,用以指导变电站A的接地网设计,校核初始设计的接地网不能满足接触电压安全限值要求,故对初始设计的接地网进行优化设计,优化的接地网设计使线路单相接地故障时站内接触电压、跨步电压均能满足安全要求。结果表明试验方法具有较好的接地网设计指导作用,具有工程实际应用指导价值。In the actual operation of the substation, when the line single phase grounding occurs, the overhead ground wire will split part of the fault current, so the substation A and its three connected substations are established in CDEGS to form the power system model, and the input current of the single phase grounding during the operation of the substation A is obtained by simulation. It is used to guide the design of the grounding grid of substation A, check that the initial design of the grounding grid can not meet the requirements of the safety limit of the contact voltage, so the initial design of the grounding grid is optimized, and the optimized results make the contact voltage and step voltage in the substation meet the safety requirements when the line grounding fault occurs. The results show that the test method has a better guiding role in the design of grounding grid, and has practical significance in engineering.

关 键 词：接地网 地线分流 变电站 单相接地 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM63