Disc rotation type four-fracture vacuum arc extinguishing chamber

Abstract

The disc-type rotary four-break vacuum interrupter is characterized in that the vacuum interrupter is a disc-type rotary four-break vacuum interrupter connected with an insulating shaft. One end of the insulating shaft is connected to an external drive motor or rotating equipment, and the other One end extends into the vacuum interrupter and connects with the insulating disk with conductor connecting rods at both ends. The moving contact is set on the end surface of the conductor connecting rod at both ends of the insulating disk. The moving contact on the end surface of the end conductor connecting rod and the corresponding static contact form two groups of four fracture structures in total, each group has two fracture structures and is installed on an insulating disk to realize synchronous breaking. The insulating disc realizes electrical insulation, and the insulating shaft drives the moving contact on the insulating disc and the conductor connecting rod to rotate, so that the moving contact and the static contact located on the circumference of the insulating wall are effectively separated to complete the disconnection of the line. The invention adopts the four-fracture shared chamber and the rotary movable contact structure, and has the characteristics of small volume and low cost.

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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