Development of new-type outdoor termination using composite insulator with SF6 gas for 77kV and 154kV transmission

摘要

Recently, composite insulators have been increasingly employed mainly from the economic viewpoint. We have been developed new type outdoor termination with composite insulator, which can be installed horizontally on the steel tower, in order to reduce the construction cost. In this outdoor termination, SF_6 gas is filled in the composite insulator and a cold shrinkable pre-molded rubber unit is applied instead of the combinational use of rubber-molded stress relief cone, epoxy resin insulator and spring unit. The application of composite insulator, SF_6 gas and cold shrinkable pre-molded rubber unit lights the total weight and makes it possible to install horizontally on the tower.rnThis paper describes mainly characteristics in a design of the new 154kV outdoor termination, and sufficient results of the development test. We also introduce an installation example of 154kV on a site.