特高压交流同塔双回输电线路电磁耦合分量的计算分析

针对特高压交流同塔双回输电线路,建立了特高压交流同塔双回输电线路电磁耦合模型,计算了一同线路停运检修时,运行线路在检修线路上感应产生的电磁耦合分量;研究了线路换位、线路故障类型、故障点位置、耦合地线等因素对电磁耦合分量的影响.研究结果表明：线路换位与架设耦合地线可有效降低线路间的电磁耦合分量;线路发生不同类型故障时,电磁耦合分量无明显变化规律;单相接地故障情况下,故障点位于线路首末两端时,电磁耦合分量出现最大值.

Analysis on the Electromagnetic Coupling Components of UHV AC Double-Circuit on the Same Tower Transmission Lines

An electromagnetic coupling model of UHV AC double-circuit on the same tower transmission lines is established according to the structure parameters, and used to calculate the electromagnetic component on the overhaul circuit induced by the operating circuit. The influence is analyzed of the transposition forms, fault type, fault location and coupling ground wires on the electromagnetic coupling component. The analysis indicate that the transmission line transposition and the coupling ground wire erection can effectively reduce the electromagnetic coupling component; the electromagnetic coupling components changes little while different line fault occurs; the electromagnetic coupling components reaches the maximum in value when single-phase ground fault occurs in the line＇ s two ends. This work is supported by Science and Technology Project of State Grid Corporation of China （2011-WG-4）.