Tap-off power from ground wire is an ideal method for on -line monitoring devices of transmission line .The first step to design tap-off power from ground wire is the selection of ground wire of tap -off power .Based on 500 kV lines of Si-chuan Electric Power Company , the performances of optical power ground wire ( OPGW) and ordinary ground wire in power , lightning impact and engineering feasibility ( the installation and implementation ) are compared with EMTP-ATP.The results show that OPGW works better in power and lightning impact , while the installation of power -tapping devices isn′t convenient ( only available at the connecting point of OPGW ) , and for the ordinary ground wire , it behaves better in installation basically with no limits of installation ( almost available for every tower ) , while it has worse performance in the other two aspects .Final-ly, the basic principles and methods to select ground wire of tap -off power are discussed .%地线取能是输电线路在线监测装置较为理想的供电方式,地线取能设计首先面对的是取能地线的选择. 以四川省电力公司所属的某500 kV线路为基础,借助EMTP-ATP程序对光纤复合地线( OPGW)和普通地线在取能功率、雷电冲击影响以及工程可行性(主要指安装实施)3方面的表现进行分析比较. 分析表明,OPGW在取能功率和防雷性能上较优,但取能装置安装不方便(只宜在光纤续接塔处安装);普通地线则在取能功率和防雷性能上较差,但是安装比较方便,且安装位置不限(几乎可以在线路上任何一基杆塔上安装). 最后以此为基础,讨论了选择取能地线的基本原则和方法.
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