U-shaped longitudinal magnetic contact conductive structure of high-voltage vacuum arc-extinguishing chamber

Abstract

Disclosed is a U-shaped longitudinal magnetic contact conductive structure of a high-voltage vacuum arc-extinguishing chamber. The U-shaped longitudinal magnetic contact conductive structure comprises a movable contact conductive structure and a static contact conductive structure arranged in the vacuum arc-extinguishing chamber; the movable contact conductive structure comprises a contact piece and a conductive rod arranged on the back part of the contact piece; a current converging block and a supporting base are mounted at one end, close to the contact piece, of the conductive rod; the other end of the current converging block is welded with the contact piece; a U-shaped iron sheet group is arranged on the contact piece; the current converging block is arranged in a position far from the slot opening of the U-shaped iron sheet group; the length of the current converging block in the direction of the slot opening of the U-shaped iron sheet group is smaller than 1 / 2 of the diameter of the conductive rod; and the static contact conductive structure and the movable contact conductive structure are the same in structure, and the contact pieces thereof are arranged oppositely and are coaxially mounted in central symmetry. By virtue of the structure, the relatively low loop resistance of the high-voltage vacuum arc-extinguishing chamber can be ensured while the longitudinal magnetic field of the U-shaped longitudinal magnetic contacts in a large opening range can be effective reinforced, so that the effective area of the longitudinal magnetic field is enlarged, and the short-current-circuit disconnecting capability of the U-shaped longitudinal magnetic contacts of the high-voltage vacuum arc-extinguishing chamber in the large opening range is improved.

Description

technical field [0001] The invention belongs to the technical field of vacuum switches, in particular to a conductive structure of a horseshoe-type longitudinal magnetic contact in a high-voltage vacuum interrupter. Background technique [0002] High-voltage circuit breaker is an important switchgear in the power system. It has dual functions of control and protection, and is of great significance to the safe operation of the power system. Thanks to SF 6 The gas is designated as a strong temperature-effect gas by the "Kyoto Protocol", so the development of vacuum circuit breakers with environmental friendly characteristics to a higher voltage level will reduce SF 6 The use of gas is significant. [0003] The vacuum interrupter is an important part of the vacuum circuit breaker. In order to improve the short-circuit breaking capability of the high-voltage vacuum interrupter, a longitudinal magnetic field is usually introduced in the interrupter to control the vacuum arc. I...

AI Technical Summary

Problems solved by technology

However, there is a structural defect in the horseshoe-shaped longitudinal magnetic contact structure, that is, when the contact distance is large (close to the width of the horseshoe-shaped iron slot), the control effect of the longitudinal magnetic field between the contacts on the vacuum arc drops sharply, resulting in a vacuum Interruption chamber failure

This defect makes it difficult for the traditional horseshoe-type longitudinal magnetic contact to meet the arc extinguishing capability requirements of the high-voltage vacuum interrupter with a large opening distance, which limits its application in high-voltage vacuum interrupters.

In addition, due to the low ratio of the effective area of ​​the longitudinal magnetic field to the total area of ​​the contact piece, the traditional horseshoe-shaped longitudinal magnetic contact also has the problem of severe local ablation of the contact piece

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