浅议大中型水电站接地电阻设计值  

Discussion on the Design Value of Grounding Resistance of the Large and Medium-sized Hydropower Stations

作　　者：夏斌强 施经纬 范传青 郑智勇 马峰 XIA Binqiang;SHI Jingwei;FAN Chuanqing;ZHENG Zhiyong;MA Feng(State Grid Xinyuan Holding Co.Ltd.,Beijing 100001,China;Anhui Jixi pumped storage Co.Ltd.,Jixi,245300,China;Changsha Kezhi Lightning Protection Engineering Co.Ltd.,Changsha,410001,China)

机构地区：[1]国网新源控股有限公司,北京市100001 [2]安徽绩溪抽水蓄能有限公司,安徽省绩溪县245300 [3]长沙科智防雷工程有限公司,湖南省长沙市410001

出　　处：《水电与抽水蓄能》2022年第2期110-112,共3页Hydropower and Pumped Storage

摘　　要：大中型水电站各种功能的接地采用联合接地方式,其接地电阻设计值取决于各种功能接地的最小值,最小值取决于二次系统二次装置内部芯片和电路板的最大绝缘耐受电压。依据相关研究二次设备(综合自动化设备内部芯片和电路板)的2s工频绝缘耐受电压为5kV。因此,大中型水力发电厂二次装置的最大绝缘耐受电压为5kV。如果大中型水力发电厂入地短路电流为I(A),其接地电阻设计值为不大于5000/I。The combined grounding mode is adopted for the grounding of various functions of the large and medium-sized hydropower stations.The design value of grounding resistance depends on the minimum value of various functional grounding,and the minimum value depends on the maximum insulation withstand voltage of the chip and circuit board in the secondary device of the secondary system.According to relevant research,the 2 seconds power frequency insulation withstand voltage of the secondary equipment(internal chip and circuit board of integrated automation equipment)is 5kV.Therefore,the maximum insulation withstand voltage of the secondary devices in the large and medium-sized hydropower plants is 5kV.The unit of grounding short-circuit current of the large and medium-sized hydropower plants is I(A),and the design value of grounding resistance is not greater than 5000/I.

关 键 词：接地电阻 入地短路电流 跨步电压 接触电压 绝缘耐受电压 二次系统 芯片 电路板 

分 类 号：TM622[电气工程—电力系统及自动化]