Development of new-type outdoor termination using composite insulator

Recently, composite insulators have been increasingly employed mainly from the economic viewpoint. We have developed a 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, SF₆ 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, SF₆ gas and cold shrinkable pre-molded rubber unit reduces the total weight and makes it possible to install horizontally on the tower. The composite insulator type outdoor termination for 77kV XLPE cable is already applied as commercial use and does reduce the construction cost of power transmission lines. This paper describes the design and development test results of the 154 kV new type outdoor termination and also gives results of a survey of aging characteristic evaluation of 77kV outdoor termination using composite insulator.