Insulator Crossarms for 345-KV EHV Transmission Line

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.