Production process of solid-packaged polar pole

Abstract

The invention relates to a production process of a solid-packaged polar pole, which comprises the following steps: a) mounting a mold head and a seal ring, and coating an adhesive; b) placing a vacuum arc extinguish chamber on an elastic block in a mold, and closing the mold; and using a lead screw to push against a movable mold head of the vacuum arc extinguish chamber; c) injecting material andcuring; d) demolding; e) sampling; and f) performing secondary package with epoxy resin. Compared with the prior art, the production process has the benefit that the strict temperature control is performed during the molding process of a silicon rubber buffer layer, and water is adopted for heating and cooling the mold in a circulating manner, thereby ensuring that an interface between the surface of an outer ceramic case of the vacuum arc extinguish chamber of the solid-packaged polar pole and silicon rubber and the interface between the silicon rubber and the epoxy resin have no air gaps, no non-uniform stress distribution and the like, further avoiding the precipitating factor of local discharge of the interfaces, and ensuring the reliability and the safety of the solid-packaged polar pole product during long-term live operation.

Description

technical field [0001] The invention belongs to the field of medium-voltage switch manufacturing, and in particular relates to a production process of a solid-sealed pole. Background technique [0002] The solid-sealed pole refers to an independent component that encapsulates the vacuum interrupter and (or) conductive connections and their terminals with solid insulating materials. It has unique advantages such as high dielectric strength, strong resistance to environmental pollution, small size, high reliability, easy installation, and maintenance-free, and can realize the miniaturization of switchgear. The solid-sealed vacuum switch is the current development trend of the domestic medium-voltage switch industry. . [0003] At present, the most common production process of embedded pole is: silica gel buffer layer and epoxy resin embedded molding technology. Most of the silica gel buffer layer is directly injected, and the epoxy resin solid sealing molding is commonly use...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned production process also has many defects: since the insulation of the solid-sealed pole is composed of epoxy resin---coupling agent (air)---silicone rubber---coupling agent (air)- --Ceramics---Vacuum consists of six media with different dielectric constants

However, if there is an air gap or uneven stress distribution at the interface between the surface of the ceramic shell outside the vacuum interrupter chamber and the silicone rubber, or at the interface between the silicone rubber and the epoxy resin, the electric field strength at the two interfaces will increase significantly, and the interface will deteriorate. , easy to generate discharge and form partial discharge

When the insulation deterioration accumulates to a certain extent, the breakdown will occur here, causing irreversible damage to the insulation medium or the permeability breakdown of the ceramic shell

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