500kV/220kV同塔四回混压输电线路检修作业安全防护研究  

Research on security protection of maintenance work on 500kV/220kV four-circuit mixed-voltage transmission lines on the same tower

作　　者：李金亮[1] 邹德华[1] 刘夏清[1] 牛捷[1] 严宇[1] 徐溧 

机构地区：[1]国家电网湖南省电力公司带电作业中心,湖南长沙410010

出　　处：《电力科学与技术学报》2016年第2期134-140,共7页Journal of Electric Power Science And Technology

基　　金：国网湖南省电力公司科技项目(5216AD14000M)

摘　　要：500kV/220kV同塔四回混压输电线路可有效解决日益增长的电力需求和输电走廊资源紧缺的矛盾,但四回线路线间耦合严重,当220kV一回线路停运,其他三回线路正常运行时,停运线路上的感应电压和感应电流会危及检修人员安全。考虑线路长度的影响,采用EMTP-ATP计算分析检修作业过程的感应电压、感应电流,采用有限元法计算分析待检修线路作业人员周围电场分布,在此基础上提出500kV/220kV同塔四回混压输电线路检修作业安全防护措施。分析结果表明:仅在检修点两侧挂接临时接地线,感应电流将超过1mA不能满足检修作业安全要求,在检修人员所处位置挂个人保安线可有效降低感应电流,保证检修人员安全;在检修下层220kV线路时,检修人员体表场强超过240kV/m,需穿屏蔽服。500 kV/220 kV four-circuit mixed-voltage transmission lines on the same tower can be considered for solving the contradiction between the growing electricity demand and the limited line corridor.Because of the strong coupling among the four circuits,when 220 kV one-circuit lines are outage and the other three are in normal working,the induced voltage and induced cur-rent will endanger the safety of the maintenance personnel.Taking the line length consideration, this paper adopted EMTP-ATP to calculate and analyze the induced voltage and induced current, and used finite element method to analyze the electric field distribution around maintainers.Safety protection methods under maintenance of 500 kV/220 kV four-circuit mixed-voltage transmission lines were proposed.Simulation results showed that the induced current would be greater than 1 mA which could not meet the safety requirements if maintainers only link earth wire at the side of the maintenance spot.It can reduce induced current to ensure the safety of the maintenance by suspending personal security line on the position of the maintainer.Screen clothes would be nec-essary if the electric field intensity of maintainer＇s body surface exceeds 240 kV/m when the 220 kV one-circuit line maintaining.

关 键 词：同塔混压 感应电压 感应电流 电场计算 

分 类 号：TM755[电气工程—电力系统及自动化] TM81