Composite bushing machining method

Abstract

The invention provides a composite bushing machining method. The composite bushing machining method comprises the following steps: mixing materials, preheating a mold and a conducting rod, injecting the materials, closing the mold, carrying out pressure maintaining, solidifying and the like. The composite bushing machining method is characterized in that the conducting rod is subjected to sand blasting treatment firstly before the conducting rod is preheated, a sand blasting grinding material is brown aluminium oxide, and the particle size of the blasting grinding material is 0.1-0.8mm; in the material mixing working procedure, the placement time from the uniform stirring of the mixture to the material injection is 7-8 hours. The composite bushing machining method has the advantages that the surface of the metal conducting rod is subjected to sand blasting treatment firstly before the conducting rod is preheated, so that the roughness can be improved, and the contact area can be enlarged, thus when epoxy pressure gel is molded, the bonding strength between the conducting rod and the epoxy resin is obviously improved, and the elimination of air vents and air gaps can be facilitated; in addition, the placement time of the mixture is prolonged, and the improvement of the viscosity of the mixture is facilitated, so that the purpose of eliminating the air vents and the air gaps is further achieved.

Description

[0001] 【Technical field】 [0002] The invention belongs to a processing method for electrical equipment components, in particular to a processing method for a composite sleeve used in conjunction with a high-pressure gas-filled cabinet. [0003] 【Background technique】 [0004] Composite bushings are mainly used in separate insulating connection systems to connect transformers, switches and other electrical equipment filled with insulating oil. When used in high-voltage inflatable cabinets, in order to ensure the airtight performance of the high-voltage inflatable cabinets, the electrical components in the cabinets need to be tested. The welded-in composite bushing connects outward to the cable or busbar. Therefore, the performance of the composite bushing will directly affect the insulation performance of electrical equipment and the safety and reliability of operation. The structure of the existing composite casing includes an insulator and a conductive rod insert arrange...

AI Technical Summary

Problems solved by technology

The composite casing made according to the existing processing technology has the following problems: there are many pores and air gaps inside the product, and the electrical performance is poor. It is difficult to meet the 28kV voltage condition. The partial discharge must be less than 3pC. %, which not only greatly increases the production cost, but also seriously affects the safety performance of electrical equipment