GAP-TYPE OVERHEAD TRANSMISSION LINE AND MANUFACTURING METHOD THEREOF
A gap-type overhead transmission line includes a steel core member; a conductor layer positioned to surround the steel core member and having at least one strand wire aggregated therein; and a coating layer interposed in a solid state between the steel core member and the conductor layer so as to surround the steel core member, the coating layer including a material that is sublimated after the conductor layer is stranded so as to form a predetermined gap between the steel core member and the conductor layer.
1 . A gap-type overhead transmission line, comprising:
a steel core member;
a conductor layer positioned to surround the steel core member and having at least one strand wire aggregated therein; and
a coating layer interposed in a solid state between the steel core member and the conductor layer so as to surround the steel core member, the coating layer including a material that is sublimated after the conductor layer is stranded so as to form a predetermined gap between the steel core member and the conductor layer.
2 . The gap-type overhead transmission line according to claim 1 , wherein the coating layer has a thickness of 0.1 mm to 10 mm.
3 . The gap-type overhead transmission line according to claim 1 or 2 , wherein the coating layer includes naphthalene, dry ice or ice.
4 . The gap-type overhead transmission line according to claim 1 or 2 , wherein a loose rate of the steel core member and the conductor layer is in the range of 0.1 to 0.5%.
5 . A method for manufacturing a gap-type overhead transmission line, comprising:
(a) providing a steel core member;
(b) forming a coating layer of a predetermined thickness with a sublimate material so as to surround the steel core member;
(c) stranding a conductor layer having at least one strand wire aggregated therein around the coating layer; and
(d) forming a predetermined gap between the steel core member and the conductor layer by means of phase change of the coating layer.
6 . The method for manufacturing a gap-type overhead transmission line according to claim 5 ,
wherein the sublimate material includes naphthalene, dry ice or ice.
7 . The method for manufacturing a gap-type overhead transmission line according to claim 5 or 6 ,
wherein the coating layer has a thickness of 0.1 mm to 10 mm.
8 . The method for manufacturing a gap-type overhead transmission line according to claim 5 or 6 ,
wherein, in the step (c), a preformed strand wire is stranded.
9 . The method for manufacturing a gap-type overhead transmission line according to claim 5 or 6 ,
wherein, after the step (d), a loose rate of the steel core member and the conductor layer is in the range of 0.1 to 0.5%.