Suspension Insulator Assemblies Their Design and Economic Selection

Abstract
This paper presents a summary of data from extensive impulse and 60-cycle laboratory flashover tests upon suspension insulator strings relative to unit shell diameter and unit spacing. The insulating qualities and the economic advantages of the various sizes of units are discussed with due regard to the most recent lightning protection theories. Both steel tower and wood pole high-voltage transmission line insulation are given consideration from the electrotechnical and economic standpoint.

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