Insulation Performance Analysis of a 500-kV Transmission Line Design

A statistical insulation performance analysis of the Bonneville Power Administration´s 500-kV delta tower is described. Emphasis is placed on establishing a design philosophy and a design procedure that will provide a means of converting quantitative performance criteria to tower dimensions. Insulation requirements for switching surges and for 60-Hz voltages during extreme wind conditions have been given particular attention. The selection of balances performance criteria in the context of overall system reliability is discussed.