Central tension member for an overhead cable and the overhead cable comprising the same

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joist line that is the center of a machining power transmission line and a machining power transmission line including the joist line. Specifically, the present invention can realize the low-pass characteristics of the overhead power transmission line and the sufficient bending resistance can suppress the breakage of the bobbin, drum, pulley, etc. for winding or manufacturing of the overhead transmission line, The invention relates to a joist line that is a center for a machining power transmission line capable of suppressing corrosion of a conductor line disposed around the center joist line and capable of reducing the total resistance of the machining power transmission line and improving the amount of power transmission and a machining power transmission line including the joist line.