Heavy-Duty Insulator Assemblies for 500-kV Bulk Power Transmission Line with Large diameter Octagonal-Bundled Conductor

This paper describes the design prodedure and the results of field tests on mechanical performances of insulator assemblies newly developed to support octagonal-bundled conductors for 500-kV bulk power transmission. Taking account of conductor-motion-induced peak tensile load, fatigue, torsional torque and others, a successful design has been achieved in two prototype assemblies for such heavy mechanical duties as encountered during conductor galloping or swing. This has been proved throughout three years of the field tests.