Application:As we all know, there must be a tiny air gap between the insulating parts and the mounting plate in the medium voltage switchgear, and the field strength of this small air gap will far exceed the breakdown field strength of the air, and a discharge phenomenon will occur in the small air gap. The charged particles overflow from the air gap and distort the original electric field after reaching the interface, thereby reducing the flashover voltage and reducing the reliability of the insulating parts. Therefore, the existence of this small air gap must be eliminated. In high-voltage products, the shielding ring is cast and encapsulated in the matching insulating parts such as wall bushings and contact boxes. At the same time, the high-voltage or ground is connected to the shielding ring respectively, and the high-voltage or ground is introduced into the epoxy parts, which can effectively It can effectively eliminate the small air gap between the epoxy and its installation board, achieve the purpose of uniform electric field, and improve the insulation strength and life of the product.