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Development of Feeder Messenger Wire Type Overhead Contact Line with One Copper Messenger Wire Takahiro HAMADA Atsushi IWAINAKA Researcher, Former Researcher, Contact Line Structures, Power Supply Technology Div. Feeder messenger wire type overhead contact lines have drawn attention recently from the viewpoint of labor-saving for maintenance. A type that uses two PH356mm2 messenger wires was introduced into the Tokyo district, while another that uses an SBTACSR730mm2 messenger wire into the Kansai district. In terms of the number of messenger wires, the one-wire type is more useful, as it involves a smaller number of parts. As the material for the wire, copper is better than aluminum, since it does not require connection with different metals. To realize the advantages of the two systems, therefore, we developed a feeder messenger wire type overhead contact line that has only one copper messenger wire. Keywords: feeder messenger wire type overhead contact line, PH730mm2 messenger wire, current collecting characteristics 1. Introduction Feeder messenger wire type overhead contact lines have a structure to combine the function of feeder with the messenger wire. They have drawn attention recently in Japan from the viewpoint of labor-saving for maintenance. They use two hard-drawn copper stranded conductor PH356mm2 messenger wires in the Tokyo district and an aluminum conductor steel-reinforced SBTACSR730mm2 messenger wire in the Kansai district. In terms of the number of messenger wires, the one-wire type is more useful as it involves a smaller number of parts, and copper is better as the material for the wire than aluminum since it does not require connection with different metals. Therefore, we promoted this research for the purpose of developing a feeder messenger wire type overhead contact line that has only one copper messenger wire to realize the advantages of the two systems. In order to det