High-voltage vacuum circuit breaker

Abstract

The invention discloses a high-voltage vacuum circuit breaker. The high-voltage vacuum circuit breaker comprises a box body support, a contact system, an arc extinguishing system and an operating mechanism, wherein the contact system, the arc extinguishing system and the operating mechanism are arranged on the box body support, the arc extinguishing system comprises a vacuum arc extinguishing chamber, the contact system comprises a static contact and a moving contact which are arranged in the vacuum arc extinguishing chamber, the operating mechanism comprises an insulating pull rod which is fixedly connected with the moving contact, an end, close to the exterior of the moving contact, of the insulating pull rod is fixedly sleeved with a conductive column electrically connected with the moving contact, the periphery of the conductive column is sleeved with a moving-end copper outgoing line connecting piece, an inner end of the moving-end copper outgoing line is fixed on the moving-end copper outgoing line connecting piece, an annular installation groove is formed in an inner wall of the movable end copper outgoing line connecting piece, an elastic annular sliding contact finger is fixedly installed in the installation groove, the sliding contact finger partially stretches out of the surface of the inner wall of the movable end copper outgoing line connecting piece, and the outerside surface of the conductive column makes elastic and sliding contact with the part, stretching out of the inner wall of the movable end copper outgoing line connecting piece, of the sliding contact finger. The circuit breaker is advantaged in that the circuit breaker is stable and reliable in connection, good in conductivity, convenient to install and good in insulating property.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a high-voltage vacuum circuit breaker. Background technique [0002] A circuit breaker refers to a switching device that can close, carry and break current under normal circuit conditions, and can close, carry and break current under abnormal circuit conditions (including short-circuit conditions) within a specified time. Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off the circuit when they are severely overloaded, short-circuited, or under-voltage. Its function is equivalent to a fuse-type switch. Combination with overheating and underheating relays, etc. Moreover, there is generally no need to change parts after breaking the fault current. At present, it has been widely used. [0003] However, in the existing high-voltage vacuum circuit breakers, the moving end of the arc extingu...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing high-voltage vacuum circuit breakers, the moving end of the arc extinguishing chamber and the outlet column of the moving end are generally connected through a soft connection. After the moving contact moves back and forth for a certain number of times in this connection, the copper part of the middle soft connection Chips are prone to breakage, resulting in a reduction in the current carrying capacity of the primary circuit. If broken copper pieces fall into the wall of the solid-sealed pole, it is easy to cause relative ground discharge

In addition, the existing insulating bracket still has disadvantages such as inconvenient installation, short external insulation distance, inconvenient adjustment of the opening spring structure of the existing chassis frame, and difficulty in replacement.

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