Field optimization of high voltage bushings

Abstract EN

A method is described for optimizing the field stress on HV bush- ings-penetrating though a flat grounded casing - by modifying their profile, seeking a uniform distribution of the tangential field along the bushing sur- face.

This results in an increase of the inception voltage for surface flashover on the bushing surface.

The optimization process was achieved by an algo- rithm developed for calculating the tangential field component on the bushing surface.

The algorithm was based on the charge simulation technique to satisfy the boundary conditions at the electrode, bushing and casing surfaces.

The dominant effect in the optimization process is ascribed to the inclination angle and the height of the bushing outside the casing.