南方电网技术2016，Vol.10Issue(9)：77-82,6.DOI:10.13648/j.cnki.issn1674-0629.2016.09.012
带架空地线运行的变电站主接地网接地阻抗测量与分析
Grounding Impedance Measurement and Analysis for Main Grounding Grid of Substation Operating with Overhead Ground Wire
张义 1蔡汉生 1贾磊 1刘刚 1胡上茂 1施健1
作者信息
- 1. 直流输电技术国家重点实验室 南方电网科学研究院，广州510663
- 折叠
摘要
Abstract
Due to the access of overhead ground wires of different voltage level transmission lines,the topology structure of the main grounding grid of substation operating with overhead ground wire will change significantly,and its grounding impedance cannot be measured by simply using the grounding impedance measurement method of power system grounding device. Moreover,it’s usually hard to unlock the overhead ground wire and measure the substation grounding impedance in operation,and the measurement will inev-itably be affected by the diversion of overhead grounding wire. In order to eliminate the influence of overhead ground wire,it is re-quired to measure the shunting current of each outlet frame connected with the overhead ground wire. In this paper,a grounding im-pedance measurement test for the main grounding grid of a substation operating with overhead ground wire is carried out,and a method of measuring the overhead ground wire shunt based on flexible Rogowski coil and frequency selective multimeter is proposed. The re-sults show that the overhead ground wire diversion ratio can reach 43.4%,and the angle between the shunt current and the class power frequency current injected into the main grounding grid as a reference is -19.5°. The grounding impedance of the main grounding grid of the substation is calculated,and the error between the calculated result and the experimental result is very small. The results demonstrate that the measurement method of grounding impedance of substation with overhead ground wire and the measurement meth-od of overhead ground wire shunting are correct.关键词
变电站/架空地线/接地网/接地阻抗/远离夹角法Key words
substation/overhead ground wire/grounding grid/grounding impedance/distance angle method分类
信息技术与安全科学引用本文复制引用
张义,蔡汉生,贾磊,刘刚,胡上茂,施健..带架空地线运行的变电站主接地网接地阻抗测量与分析[J].南方电网技术,2016,10(9):77-82,6.
