New type solid insulation vacuum switch three-position isolation grounding switch module

Abstract

A novel solid insulation vacuum switch three-position isolation earthing switch module is composed of a three-position isolation earthing switch operation end, a three-position isolation earthing switch, a bus interface, an outgoing line terminal, a vacuum switch, an isolation static contact, an earthing contact, an epoxy resin shell and an end cover. The novel solid insulation vacuum switch three-position isolation earthing switch module is characterized in that the three-position isolation earthing switch and the vacuum switch are cast in the epoxy resin shell in parallel and connected with a conductive contact finger base through a movable contact support, the earthing contact is installed on the end cover or the epoxy resin shell in a rear-assembly mode, and the isolation static contact is fixedly sealed inside the epoxy resin shell. According to the novel solid insulation vacuum switch three-position isolation earthing switch module, the outer contours of high-voltage parts at the working position are optimized, no additional shielding nets need to be cast inside the epoxy resin shell, product miniaturization is easily achieved, and the manufacturing technology is simplified; local electric field concentration does not exist, and the product local discharge capacity is low even if the requirement that portions which the human body can touch are earthed is met; the whole product scrapped risk is reduced.

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 novel solid-insulated 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 ti...

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, and 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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