Vacuum switch tube for helical coil longitudinal magnetic field electrode

Abstract

The invention provides a thread-coil type longitudinal magnetic field electrode vacuum switching tube which relates to the technical field of vacuum switches. The invention aims at providing a vacuum switching tube which has the arrangement disposal of the thread-coil type longitudinal magnetic field electrode so that the contradiction between the current conduction capacity and the short circuit current on-off capacity can be solved better. The vacuum switching tube comprises a moving conducting rod, a fixed conducting rod, a spiral coil, a spiral groove, a moving contact and a fixed contact which form a conducting loop. A coil of the vacuum switching tube takes the shape of a spiral body, and the turning direction of two thread coils arranged on a moving conductor and a fixed conductor is the same, and the moving contact and the fixed contact connected with the two thread coils are oppositely and longitudinally arranged. In the invention, the produced longitudinal magnetic field causes the vacuum arc produced between the contacts to keep in a non-aggregated state during the live cut-off; and the vacuum arc is extinguished when the current of an external circuit exceeds zero point, thereby the on-off of the circuit is finished.

Description

technical field [0001] The invention relates to the technical field of vacuum switches. Specifically, it is a vacuum switch tube of a helical coil longitudinal magnetic field electrode designed by utilizing the skin effect. Background technique [0002] Before the present invention was proposed, those skilled in the art knew very well that a vacuum switch tube is also called a vacuum interrupter, which is composed of a pair of electrodes sealed in a vacuum, such as contacts or contacts and a magnetic field generating structure. Driven by the moving mechanism, it is an electric vacuum device that completes the connection and breaking of the circuit. In order to have a larger breaking current for the vacuum switch tube used in circuit breakers, simple flat electrodes, such as cake-shaped metal material contacts, can no longer meet the requirements. For this reason, there are flat transverse magnetic field electrodes successively, for example, they are processed on the contact...

AI Technical Summary

Problems solved by technology

[0010] The cross-section of the conductor in the magnetic field generating part of the transverse magnetic field electrode is relatively large and the length is relatively short, so it has a relatively small loop resistance and can pass a large rated current. However, the melting and ablation of the contact surface cannot be avoided, so the breaking Capability is limited

At present, there is no vacuum switch tube with a transverse magnetic field electrode with a breaking capacity of 63kA and above; the longitudinal magnetic field electrode keeps the vacuum arc generated between the contacts in the non-aggregated state due to the longitudinal magnetic field, and the arc ablation is less than The transverse magnetic field electrode avoids the melting and ablation of the contact surface under the action of the vacuum arc, and has a large breaking capacity. However, due to the shape of the conductor connecting the contact, the current generates a circular component to generate a magnetic field. This part The cross-section of the conductor should not be too large and the length should not be too short, so its loop resistance is also relatively large, which restricts the size of its rated current; the horseshoe core longitudinal magnetic field electrode has a smaller loop resistance similar to that of the flat electrode, but due to the adopted Electrical pure iron has a large magnetic hysteresis effect. When the breaking current is large, the hysteresis magnetic field affects the deionization between the contacts after the arc is extinguished, resulting in breaking failure. Therefore, the breaking capacity of this structure is average.

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