An insulating sleeve for medium and high voltage electrical connection and its manufacturing method

Abstract

The invention discloses an insulating sleeve for medium-high voltage connection. The insulating sleeve for the medium-high voltage connection comprises a voltage carrier, an insulating housing, and a shielding element. A through hole is installed at the center of the insulating housing, the voltage carrier passes through the through hole, and the inner edge of the circumferential wall of the through hole is axially provided with a semiconductor layer. A vacuum sealing cavity is installed between the outer wall of the insulating housing and the circumferential wall of the through hole. The shielding element is axially installed in the outer wall of the insulating housing. The manufacturing method comprises the following steps: 1) manufacturing a plastic sleeve body; 2) placing the plastic sleeve body in a vacuum tank, placing an insulating end cover in a welding pressure head; 3) performing the vacuum pumping to the vacuum tank; and 4) welding the upper ends of the insulating end cover and the insulating housing, and the upper end of the through hole together, and forming the vacuum sealing cavity among the outer wall of the insulating housing, the circumferential wall of the through hole and the insulating end cover. The insulating sleeve for the medium-high voltage connection has the advantages of cost saving, environment protection, light weight, no interface problem, no liquefaction temperature, safety and reliability, and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of electrical connection of medium and high voltage switchgear, and in particular relates to an insulating bushing used in a gas-insulated switchgear and a manufacturing method thereof. Background technique [0002] At present, thermosetting resins such as epoxy resins are generally used as insulating casings for insulating sleeves commonly used for power supply connections on medium and high voltages, and the insulating casing wraps voltage carriers and shielding nets therein. The insulating shell formed by epoxy resin is generally a solid body, and the insulating capacity can also be guaranteed according to the wall thickness design of the product. Therefore, thermosetting insulating sleeves are generally large in size and heavy in weight. In addition, the curing of thermosetting resins requires a long time and high temperature, resulting in low production efficiency and high energy consumption. Moreover,...

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Problems solved by technology

), moreover, the interface bonding quality between the thermoplastic insulating shell and the silica gel is not guaranteed, which increases the risk of partial discharge and breakdown of the product; if filled with solid polyurethane or polybutylene terephthalate and other polymers For objects, secondary injection molding is required for the cavity, and the injection molding process limits the thickness of the polymer used for filling. If the polymer is thicker, it is easy to cause defects such as shrinkage cavity inside the filler.

In addition, the bonding between the glass fiber-reinforced thermoplastic insulating shell and the voltage carrier is often not dense enough, so there are easy to have subtle delamination or gaps at the contact interface between the two, which will lead to partial discharge and breakdown of the product

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