Abnormality of Electric Field at a Wedge-like Edge of a Conductor or a Dielectric Interface and its Relaxation Methods

Abstract

Abnormal electric field appears at a wedge-like edge of a conductor(electrode) or a dielectric interface, which usually becomes infinitely high. This paper analyses the electric field near such an edge by the analytical variable separation method and by the numerical one of the charge simulation method. The analysis focuses on the special conditions where the electric field becomes zero at an edge. These conditions are important for the insulation design to suppress the discharge inception at such edges of conductors and dielectric interfaces.