Disc rotation type four-fracture vacuum arc extinguishing chamber

Abstract

A disc rotation type four-fracture vacuum arc extinguishing chamber is provided, wherein the vacuum arc extinguishing chamber is the disc rotation type four-fracture vacuum arc extinguishing chamber connected with an insulating shaft; one end of the insulating shaft is connected with an external driving motor or a rotating apparatus, the other end stretches into the vacuum arc extinguishing chamber and is connected with an insulating disc which is provided with conductor connection rods at both ends; movable contacts are arranged on the end faces of the conductor connection rods at both ends of the insulating disc; static contacts are arranged on the insulating outer wall; the movable contacts arranged on the end faces of the conductor connection rods at both ends of the insulating disc and corresponding static contacts respectively form two groups (four fractures); two fractures form one group and the fractures are arranged on one insulating disc in order to realize synchronous break; the fractures between groups are electrically insulated by the insulating disc; the insulating shaft drives the insulating disc and the movable contacts on the conductor connection rods to rotate, in this way, the movable contacts and the static contacts on the circumference of the insulating wall are effectively separated from each other so as to switch on and off the circuit. The invention uses the structure of four fractures in the same extinguishing chamber and the rotating movable contacts, the volume is small and the cost is low.

Description

technical field [0001] The invention relates to a vacuum interrupter used for a vacuum circuit breaker, in particular to a disc-type rotating four-break vacuum interrupter, which belongs to the core technical field of high-voltage electrical equipment. Background technique [0002] Since the advent of the vacuum interrupter, it has been continuously developing towards miniaturization, high reliability and low cost. The vacuum interrupter is an electric vacuum device that uses a pair of contacts sealed in vacuum to realize the connection and breaking functions of the power circuit. It uses a high vacuum insulation medium. When it cuts off a certain amount of current, the moment the movable and fixed contacts are separated, the current shrinks to a certain point or points where the contacts have just separated, showing a sharp increase in the resistance between the electrodes and a rapid increase in temperature, until the electrode contact occurs. Evaporation of metals and th...

AI Technical Summary

Problems solved by technology

Most foreign products use electric spring operating mechanisms, while domestically more electromagnetic operating mechanisms are used, and the precision of the operating mechanism is too high, which makes the operating mechanism more complicated.

The equipment is bulky and has many moving parts (statistics show that about 70%-90% of equipment failures are mechanical failures of the operating mechanism), due to structural distribution problems, its movement reliability is limited, and it only has a single fracture structure. The line breaking voltage level is low. In order to break a higher level of voltage, most of the four-break structure vacuum interrupters currently used are in the form of four single-break interrupters connected in series, and the dynamic and static contacts are direct-acting. The opening and closing movement of the switch takes up a large space and is limited by the operating mechanism. The breaking synchronization between the fractures cannot meet the technical requirements, and it is easy to generate high overvoltage and inrush current, which has a great impact on the stability of the power system. impact, leading to a reduction in its service life, safety, and operational reliability

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