154kV用耐張形高分子絶縁アームの機械的特性

Abstract

This paper describes the mechanical characteristics of a 154 kV line post type polymer insulation arm which has both the functions of a steel arm and a porcelain insulator of a presently used transmission steel tower. The 154 kV line post type polymer insulation arm consists of polymer composite insulators called units which include two horizontal units with an open angle for responding to a longitudinal load of 40 kN and a suspension unit for responding to a vertical load. Its installation length is about 2.3m. Samples of the insulation arm were installed at different places of an electric wire, to form a truss structure and a lahmen structure, for examining their mechanical characteristics. For the truss structure, it was clarified that neither remarkable bending stress nor torsional stress is generated in the FRP core, and that the mechanical force design of the insulation arm can be evaluated in reference to the axial force of the FRP core only. Furthermore, the buckling coefficient for evaluating the axial force of the insulation arm with the truss structure was experimentally identified. Moreover, it was clarified that a static load test for evaluating the mechanical force performance of the insulation arm against a longitudinal load is more severe than an impact load test at the same longitudinal load.