摘要
城市变电站附近部分公路的路基会采用埋设钢筋网格的方式,这些金属路基会改变临近变电站的接地阻抗和附近的地表电位分布,并对变电站接地阻抗的测量产生影响。文中建立了公路路基导体存在条件下,临近城市变电站的接地阻抗计算模型,并在此基础上,建立了接地阻抗测量的仿真模型,计算了不同影响因素下,用夹角法测量变电站接地阻抗的测量误差。结果表明,在一定土壤条件下路基导体对变电站理论接地阻抗的影响可达31%;在距离路基边界20 m范围内,路基导体对公路沿线地表电位升的影响可达80%;推荐在实际测量时,根据变电站所处区域的土壤电阻率及土壤反射系数测量反演结果,确定对应的电流极、电压极与路基边界的间距,以选择合适的电极布置位置。
The roadbeds of some highways near the urban substations will be buried with steel grids.These metal roadbeds will change the ground impedance of the adjacent substations and the nearby surface potential distribution,and affect the measurement of the ground impedance of the substation.In this paper,the ground impedance calculation model of adjacent urban substations under the condition of the existence of highway subgrade conductors is established,and on this basis,a simulation model of ground impedance measurement is established.The measurement error of the substation grounding impedance is measured by the angle method under different influencing factors.The results show that under certain soil conditions,the influence of the substation conductor on the theoretical ground impedance of the substation can reach 31%.Within 20 m from the boundary of the roadbed,the influence of the roadbed conductor on the surface potential rise along the highway can reach 80%.It is recommended to determine the distance between the corresponding current electrode,voltage electrode and the roadbed boundary according to the soil resistivity and soil reflection coefficient measurement inversion results of the area where the substation is located in order to select the appropriate electrode placement position.
作者
王邹俊
田妍
何智强
吉旺威
林艺
鲁海亮
文习山
WANG Zoujun;TIAN Yan;HE Zhiqiang;JI Wangwei;LIN Yi;LU Hailiang;WEN Xishan(School of Electrical and Automation,Wuhan University,Wuhan 430072,China;Test and Research Institute of Guangzhou Power Supply Bureau,Guangzhou 510410,China;State Grid Hunan Electric Power Company Limited,Changsha 410007,China)
出处
《电瓷避雷器》
CAS
北大核心
2021年第2期198-205,共8页
Insulators and Surge Arresters
关键词
城市变电站
公路路基导体
地表电位分布
接地阻抗测量
夹角法
电极布置位置
urban substation
highway subgrade conductor
surface potential distribution
ground impedance measurement
the included angle method
electrode placement
