For well-shielded transmission lines, the return condition, near the substation, is of prime importance in determining the location and number of surge arresters needed to coordinate the isolation of the substation against HV lightning surges.
Hubbell’s best transmission protecta-lite line arrester line has been simplified with fewer parts and less risk of parts wear. Several steel components have been replaced with a copper bracelet. The strap makes installation easier and reduces wear points. Vibration and wear are greater on transmission line arresters because they are more exposed to wind and vibration.
The risk of a back flashover can be reduced by keeping tower foot impedances to a minimum, especially near the substation (first five to seven turns ).