发电厂接地装置接地阻抗测量方法对比和分析  

Comparison and Analysis of Grounding Impedance Measurement for Power Plant Grounding Devices

作　　者：王业斌 朱浩 孙浩 佘冰冰 张钢 WANG Yebin;ZHU Hao;SUN Hao;SHE Bingbing;ZHANG Gang(Anhui Meteorological Disaster Prevention Center,Hefei 230061,China)

机构地区：[1]安徽省气象灾害防御技术中心,安徽合肥230061

出　　处：《电工技术》2021年第21期128-131,135,共5页Electric Engineering

基　　金：安徽省气象局新技术集成项目(编号AHXJ201905);安徽省气象局新技术集成项目(编号AHXJ202004)。

摘　　要：2017~2020年分别采用直线法、夹角法和反向法对马鞍山某发电厂的接地阻抗值进行测量,并与CDEGS软件的仿真结果进行了对比。结果表明:直线法测量结果与仿真结果相近,接地阻抗与电流强度没有明显的相关性,与电流频率呈现显著的正相关。在夹角接近理论值28.95°时,夹角法与其他方法测量结果相近,与理论仿真值之间的误差小于5%。采用反向法测量时,在电流极位置一定的情况下,接地阻抗随着电位极布置距离的增大而增大,并接近于理论仿真值。虚部占总阻抗值的比例随着电位极布置距离的增大呈现减小的趋势,说明反向法可有效降低电位和电流布线间互感产生的感性分量。From 2017 to 2020,the grounding impedance of a power plant in Ma'anshan was measured by straight-line method,included angle method and reverse method respectively,and comparation is made with simulation result by using CDEGS.The results show that measured results by using the straight line method are similar to the simulation results.There is no obvious correlation between grounding impedance and current intensity,but significant positive correlation between grounding impedance and current frequency is existed.When the included angle is close to theoretical value of 28.95°,measured results by using included angle method is close to other methods and error between included angle method and simulation value is less than 5%.When the reverse method is used and the current pole position is fixed,the grounding impedance increases with the increase of the potential pole arrangement distance,and is close to the theoretical simulation value.The proportion of the imaginary part to the total impedance value shows a decreasing trend with the increase of the potential electrode arrangement distance,indicating that the reverse method can effectively reduce the inductive component generated by the mutual inductance between the potential and current wiring.

关 键 词：发电厂 接地装置 接地阻抗 直线法 反向法 夹角法 

分 类 号：TM89[电气工程—高电压与绝缘技术]