Heat dissipating device for transmission line, transmission line with heat dissipating device and method for fitting heat dissipating device to transmission line

The present invention does not replace the already laid aerial line to achieve increased capacity of the transmission line. For this purpose, the outer circumference of the already laid aerial line (2) and a jumper (8) is wound so that the surface heat dissipation rate of 0.7 or more and after the blackening process conducting wire heat dissipating belt braided or surface-blackened heat dissipating spiral rod , increase the aerial line (2) the surface cooling effect. By cooling, it can already laid aerial line (2) allows the power capacity is increased. Further, the braided heat conducting wire heat dissipating belt share the transmission function, wind noise is also decreased.