Аннотация

Insulator crossarms for 345-kv EHV transmission line have been developed and tested. They use four solid-core post insulator columns (quadruped type) or two solid-core post insulator columns and two disc insulator strings (Twin-arm type) to form a tetrapod mounted horizontally from the tower. They are characterized by making possible narrower right-of-way, more compact tower dimension, and supporting higher mechanical load. This paper presents details of the design and the tests on prototypes of 345-kv quadruped type and twin-arm type insulator crossarms. The complete assemblies satisfied combined longitudinal, vertical and transverse loads associated with a bundle conductor system strung at the conductor maximum loaded tension and also withstood the full sqile conductor breaking tests at 5,000 kg per conductor.

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