摘要
场区地表电位梯度分布是表征接地装置状况的重要参数,场区地表电位梯度分布测试需横跨整个场区,但变电站场区表层有水泥硬化路面、铺设的砾石、裸露的泥土,使得土壤电阻率并非一致且差别很大。对于场区地表电位梯度实际测试过程中存在电位极铁钎和金属圆盘混合使用,进而导致电位差测试数据与接地网真实情况相差很大的情况,基于现场实际测试案例,结合CDEGS仿真计算得到的站址土壤结构模型,对测试数据进行分析,以便为现场测试提供参考。
The field surface potential gradient distribution is an important parameter to characterize the condition of the grounding device.The field surface potential gradient distribution test needs to span the whole field.However,the surface of the substation site has cement hardened pavement,paved gravel,and exposed soil,making the soil resistivity not uniform and very different.For the actual testing process of surface potential gradient in the field,there is a mixed use of potential pole iron drill and metal disc,which leads to a great difference between the potential difference test data and the actual situation of grounding grid.Based on actual field test cases,combined with the site soil structure model obtained by CDEGS simulation calculation,the test data is analyzed to provide reference for field test.
作者
余炜
沈映
余云光
张睿
YU Wei;SHEN Ying;YU Yunguang;ZHANG Rui(Honghe Power Supply Bureau of Yunnan Power Grid Co.,Ltd.,Honghe 661100,China)
出处
《电工技术》
2021年第13期35-37,共3页
Electric Engineering
关键词
接地网
状态评估
电位梯度分布
grounding grid
condition assessment
potential gradient distribution
