Solid insulation vacuum switch three-position isolation earth switch module

Abstract

A solid insulation vacuum switch three-position isolation earth switch module is composed of a three-position isolation earth switch operation side, a three-position isolation earth switch, a bus interface, a wire outlet terminal, a vacuum switch, an isolation fixed contact, a grounding contact, an epoxy resin shell and an end cover. The solid insulation vacuum switch three-position isolation earth switch module is characterized in that the three-position isolation earth switch and the vacuum switch are cast inside the epoxy resin shell in parallel and connected with a conductive button contact base through a moving contact support; the grounding contact and the moving contact support are fixedly packaged to the end cover and the epoxy resin shell respectively; the isolation fixed contact is cast in the bus interface and connected with a conductor in the bus interface. The appearance profiles of all high-voltage components of the module are optimized, a shielding screen does not need to be additionally cast to the inner portion of the epoxy resin shell, miniaturization of the product is easily achieved, and the manufacturing process is simplified. Under the condition that portions capable of being touched by the human body are all grounded, magnitude of partial discharge of the product is still low; the requirement for the appearance profile of the moving contact support is low, part allowable errors are higher, the manufacturing process is simpler, cost is low, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to a vacuum switch three-position isolating grounding switch module used in high-voltage switchgear, in particular to a vacuum switch three-position isolating grounding switch module used in solid-insulated fully enclosed combined electrical appliances. Background technique [0002] Ring network power supply is a commonly used power supply form in power distribution system, and ring network cabinet is the core component to realize safe power supply, generally divided into three types: air insulation, SF6 insulation and solid insulation. Due to the limitation of air insulation performance, air-insulated ring network cabinets are generally large in size and occupy a large area. And because the high-voltage live parts are directly exposed to the air, the performance and reliability of the product will be directly affected by the environment. SF6 is a gas with a strong greenhouse effect, which is about 23,000 times that of CO2, and i...

AI Technical Summary

Problems solved by technology

[0005] Screws or pins are required to fix the knife switch. The protrusion of the screws or pins will cause the electric field to concentrate, thereby reducing the voltage resistance of the product

Especially for the design of the external grounding of the insulating part, it is not conducive to the miniaturization of the product

This type of design also needs to cast shielding nets in epoxy materials to improve the electric field, and the manufacturing process is complicated

Using a vacuum switch can effectively control the electric field and reduce the amount of partial discharge, but the cost of the vacuum switch is high. In addition, the vacuum switch has not been widely accepted as an isolating switch due to factors such as leakage and invisible fracture.

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