工频大电流法测量电厂接地电阻的抗干扰措施研究  

Study on anti-jamming measures of measuring earth resistance of power plant by large-current method

作　　者：俞飞[1] 覃明俊 卫文君[1] 

机构地区：[1]湖北省电力公司检修公司,湖北武汉430000

出　　处：《企业技术开发》2014年第6期27-30,共4页Technological Development of Enterprise

摘　　要：文章分析了采用工频大电流法测试某电厂接地电阻时现场遇到的问题,提出现场利用现场厂用变压器解开二次侧中性点接地作为测试电源;解决了现场测试时回路阻抗过高和接线断线问题;认为测试时,应解开避雷线和接地装置的连接,并分析了采用工频大电流法测量电厂接地电阻时的影响因素。经现场试验验证,合理减少干扰后,能够得到较为准确的接地电阻值。The problems of measuring ground resistance by large-current method in a power plant is analyzed in this paper.It analyzes unlocking the use of station transformer secondary neutral ground as a test power,and solves the problems that the testing loop impedance is too high and the broken line.It shows we should unlock the overhead static cable and the grounding connection in test,and analyzes the factors of large-current method in power plant.The field test verified that, it is able to get more accurate values of earth re sistance as long as reducing interference rationally.

关 键 词：接地网 接地电阻 大电流法 

分 类 号：TM934.1[电气工程—电力电子与电力传动]