摘要
Abstract
As the current generated by lightning strikes can easily cause damage to substation equipment,the current PMU grounding fault is difficult to achieve effective control of the grounding resistance value,resulting in poor PMU grounding quality,and discusses the PMU grounding faults in the installation of small current devices in substations.Briefly describe the project overview,the project in this paper is located in the study area of the average number of lightning occurs throughout the year is more than 10,000 times,substation equipment and transmission lines are mostly operated in the open air environment,need to take reasonable PMU grounding faults to reduce the grounding resistance.Construction preparation and substation equipment debugging,timely inspection of substation equipment in the presence of potential safety hazards,lightning net and lightning line erection,clean up the site construction welding waste,check the quality of small current device installation.PMU grounding structure design and grounding resistance assembly,do the appropriate reinforcement and rust treatment,check the connection of each line,complete the construction.After the construction effect analysis,measurement of grounding resistance at different test current injection,the grounding resistance value at different voltage pole distance are below 0.55Ω,the average value of grounding resistance after the PMU grounding construction by this paper is 0.531Ω,compared with the method of this paper before the construction of a significant reduction,proving that the method of this paper can effectively reduce the value of grounding resistance,has the feasibility.关键词
变电站小电流装置安装/PMU接地/避雷网/PMU接地结构/避雷线/接地电阻Key words
substation small current device installation/PMU grounding/lightning protection network/PMU grounding structure/lightning conductor/grounding resistance分类
建筑与水利
