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从分段绝缘地线取能具有工程简单、适用范围广等独特优点,是一种颇具潜力的架空输电线路在线供电方式.但该方式存在取能功率通常较小及运行安全受雷击威胁的问题,这两个问题也是决定该方式是否可行的关键.首先,该文通过对典型线路地线电磁感应的分析,提出了基于涡旋感应的取能等值计算电路,并对取能端口的戴维南等效电路参数进行了推导.同时,对有关线路参数如档距与杆塔接地电阻分布等的影响进行了分析.在此基础上可以方便地通过参数选择、阻抗匹配等获得所需功率.其次,通过EMTP-ATP程序对雷电冲击的影响及其防护进行了仿真分析.最后,以四川电网某500kV线路为例对取能功率等进行了现场实测.实测结果说明取能分析与计算是合理的,此外取能装置对线路绝缘不构成威胁.“,”To tap power from segmented ground wire of overhead transmission line has unique advantages such as simplicity in engineering implement and wide application scope, and therefore is quite promising in on-line powering of overhead transmission lines. However, there are problems with this approach that the tapping power is usually small and is prone to suffer lightning strike which are just the keys to its feasibility. First, through the theoretical analysis for electromagnetic induction of ground wire of typical lines, the equivalent calculation circuit for power tapping was proposed based on vortex induction, and then the Thevenini's equivalent circuit parameters of the corresponding power-tapping port are deduced. Meanwhile, effects of actual line parameters such as span and tower-footing-resistance distribution were analyzed. And on this basis required power could be obtained conveniently through parameters selection and impedance- matching. Secondly, influence of lightning strike and protection against it was analyzed through EMTP-ATP simulation program[0]. Finally, field measurements for power-tapping power etc were conducted at a 500kV line. Results show that the theoretical analysis and calculations for power tapping are reasonable. Besides, the power-tapping device is less threatening to line insulation.