220 kV/500 kV混压同塔四回输电线路检修方式  

220 kV/500 kV maintenance of a mixed pressure with the four-line transmission line tower

作　　者：任承贤 李稳 时海刚 邹德华 严宇 刘兰兰 欧跃雄 曾文远 童诚 REN Cheng-xian;LI Wen;SHI Hai-gang;ZOU De-hua;YAN Yu;LIU Lan-lan;OU Yue-xiong;ZENG Wen-yuan;TONG Cheng(Hunan Electric Power Co.Ltd.Maintenance Company,State Grid Co.,Changsha 410018,China;Hunan Province Key Laboratory of Intelligent live working Technology and Equipment(robot),Changsha 410004,China;State Grid Corporation Laboratory of Live-working Inspection and Intelligent Operation Technology,Changsha,410007,China;State Grid of China Technology College,Taian 271000,China)

机构地区：[1]国网湖南省电力有限公司检修公司,湖南长沙410018 [2]智能带电作业技术及装备(机器人)湖南省重点实验室,湖南长沙410004 [3]带电巡检与智能作业技术国网公司实验室,湖南长沙410007 [4]国网技术学院,山东泰安271000

出　　处：《电力科学与技术学报》2018年第3期147-153,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：由于近年同塔多回线路得到广泛应用,其多回线路故障将威胁其安全稳定运行,而检修作业是消除故障的重要技术手段。针对同塔多回线路运行特点,考虑线路两端接地开关的工作方式和线路的长度,计算单回停运回路上的感应电压和电流。计算结果表明:当停运回路两端接地开关不接地时感应电压最大值达到80.686 kV,但它不随线路长度发生变化,仅与运行回路电压有关;停运回路一端接地开关接地时感应电流和感应电压最大值分别达到11.741 A、9.892 kV;停运回路两端接地开关均接地时感应电流最大达到227.02 A,线路长度的影响基本可以忽略。同时,根据研究结果确定停运回路检修的2种方式和安全防护措施,并提出运行回路带电作业进出电场的"档外荡入法",经实际应用表明该方法安全可靠。该文研究结果可为同塔多回输电线路检修工作的开展提供有力技术支撑。In recent years,multi-circuit lines on the same tower are widely applied in practical.The failure of multi-circuit can threat its safe and stable operation,therefore,the maintenance is an important technical measure to eliminate the fault.In this paper,based on the operation characteristics of the multi-circuit operation on the same tower,the induced voltage and induced current of the single circuit line are calculated by considering the working modes of grounding switch and the length of the line.The results show that the maximum value of the induced voltage is 80.686kV if the grounding switch at the both ends of line is ungrounded.This voltage does not change with the length of the line,and it is only related to the voltage of operating line.When the grounding switch at one end of the outage line is ungrounded,the maximum values of induced current and induced voltage are 11.741A and 9.892kV respectively.The maximum induced current is 227.02A when the grounding switch at both ends of the outage line is grounded,and the influence of line length can be neglected.Besides,two maintenance methods of outage lines and the safety protection methods are verified.The"swing method"proposed in this paper is proved to be safe and reliable by practical applications.This method can provide a powerful technical support for the maintenance work of multi-circuit transmission line on this same tower.

关 键 词：同塔多回线路 感应电压 感应电流 检修方式 

分 类 号：TM84[电气工程—高电压与绝缘技术]