The creeping discharge has a large relationship with the distribution of the electric field on the surface of the solid medium. There are three typical situations:
(1) The solid medium is in a uniform electric field, and the interface between solid and gas media is parallel to the power line. This situation is rarely encountered in engineering, but often encounters the situation where the medium is in a slightly inhomogeneous electric field. At this time, the discharge phenomenon has many similarities with the uniform electric field.
(2) The solid medium is in an extremely inhomogeneous electric field, and the electric field intensity is perpendicular to the surface of the medium (hereinafter referred to as the vertical component) much larger than the component parallel to the surface. This is the case with bushings.
(3) The solid medium is in an extremely inhomogeneous electric field, but the electric field intensity parallel to the surface of the medium is larger than the vertical component in most parts of the surface of the medium (except for a very small area immediately adjacent to the electrode). This is the case with post insulators.
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