摘要
牵引变电所接地网在高速铁路综合接地系统的作用范围内,其接地阻抗的测量必然会受到高速铁路综合接地系统的影响,并不能简单照搬电力系统接地装置接地阻抗的测量方法。基于CDEGS软件建立高速铁路综合接地系统存在下牵引变电所接地网接地阻抗计算模型,分析了均匀土壤电阻率下高速铁路综合接地系统对牵引变电所接地网地表地电位升分布的影响。在此基础上,建立了某段高速铁路综合接地系统存在下的牵引变电所接地网接地阻抗测量仿真模型,分析了不同电极布置方式、不同电流极距离下用夹角法测量牵引变电所接地网接地阻抗的准确度,并开展了现场试验。仿真计算和现场实测表明:高速铁路综合接地系统的存在,减小了牵引变电所接地网的作用范围,严重影响了夹角法测量牵引变电所接地阻抗的准确度。合理地布置电流极和电压极,能减小高速铁路综合接地系统对牵引变电所接地网接地阻抗测量的影响,远离30°夹角法适合高速铁路综合接地系统存在下牵引变电所接地网接地阻抗的测量。
The grounding grid of traction substation is within the influence scope of the integrated grounding system for high-speed railway, and the measurement of its grounding impedance is bound to be influenced by the integrated grounding system for high-speed railway, therefore, it can not simply copy the grounding impedance measurement method of power system grounding device. Based on the CDEGS software, we established a calculation model of the grounding impedance of grounding grid in traction substation in the existence of integrated grounding system for high-speed railway,and analyzed the influence of the integrated grounding system for high-speed railway on the ground potential rise distribution of traction substation grounding grid under a homogeneous soil resistivity. Thereby, the simulation model of grounding impedance measurement of grounding grid in a traction substation was established in the presence of integrated grounding system for high-speed railway. We also analyzed the accuracy of measuring the grounding impedance of traction substation by an angle measurement method under different electrode arrangements and different current electrode distances, and performed the field tests. The simulation calculation and the field measurement show that the existence of integrated grounding system for high-speed railway reduces the influence scope of the grounding grid of traction substation, and seriously affects the accuracy of the angle measurement method for measuring the grounding impedance of traction substation. Reasonable arrangements of current electrode and voltage electrode can reduce the influence of integrated grounding system for high-speed railway on grounding impedance measurement of traction substation grounding grid, and a 30-degree-beyond angle method is suitable for the grounding impedance measurement of the grounding grid in traction substation in the existence of integrated grounding system for high-speed railway.
作者
张义
蔡汉生
贾磊
刘刚
胡上茂
李瑞显
ZHANG Yi;CAI Hansheng;JIA Lei;LIU Gang;HU Shangmao;LI Ruixian(State Key Laboratory of HVDC Transmission Technology,Electric Power Research Institute,China South Power Grid,Guangzhou 510663,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第3期723-729,共7页
High Voltage Engineering
基金
南方电网公司科技项目(CSGTRC-K153001)~~
关键词
高速铁路
综合接地系统
牵引变电所
接地阻抗
夹角法
CDEGS
high-speed railway
integrated grounding system
traction substation
grounding impedance
angle method
CDEGS
