同塔多回输电线路感应电压和感应电流的研究  

Research on Induced Voltage and Current of Multi-Circuit on the Same Tower

作　　者：汪晶毅[1] 李志泰[1] 潘春平[1] 

机构地区：[1]广东省电力设计研究院,广州市510663

出　　处：《电力建设》2011年第3期56-60,共5页Electric Power Construction

摘　　要：建设同塔多回路是提高单位走廊输送容量、节省线路走廊的有效措施,但是回路间距减小,耦合大大加强,当停电检修时,运行回路将在检修回路上产生较高的静电感应和电磁感应。对220kV、500/220kV以及500kV同塔四回路进行了感应电压和电流计算,结果表明:与普通双回路相比,同塔多回路的感应电压和电流均较高,且超过IEC和国标规定的接地刀闸额定值;感应电压和电流与相序布置、换位情况、线路输送容量、线路平行长度等均有密切关系;当检修回路两端接地时,线路沿线的电压并不为0,工作杆塔上的停电导线须可靠接地。The construction of multi-circuits on the same tower is an effective approach to increase transmission capacity of electric power corridors and decrease corridor width.As the reduction of circuit distance and phases distance,high induced voltage and current caused by coupling of energized lines could influence lines under maintenance.220 kV,500 kV and hybrid-voltage quadruple-circuits on the same tower were studied and calculated respectively,results showed that induced voltage and current of multi-circuits on the same tower were much higher than ordinary twin-circuit lines,and exceeded the rated value of grounding isolators according to the IEC standard and the national standard.Voltage and current are closely related to phase arrangement,transposition,transmission capacity,length of parallel lines,and etc.Voltage along the maintained line is not zero when two ends are grounded,so failure lines on the tower that workers are climbing should be reliably grounded.

关 键 词：同塔多回路 水平排列 垂直排列 感应电压 感应电流 接地刀闸 

分 类 号：TM755[电气工程—电力系统及自动化]