A fast tripping device for moving contacts

Abstract

The invention discloses an expulsive rapid tripping device of a moving contact. The tripping device comprises a moving contact, an operation mechanism, a traction bar, a transfer rod, a moving contactspring, a rotating shaft and a static contact, the moving contact includes an open groove capable of assembling the transfer rod and a sliding groove cooperated with a bending angle in the transfer rod, the rotating shaft includes a sliding groove and a guiding groove cooperated with a boss in the transfer rod, the rotating shaft is also provided with a rotating point limiting movement of a straight rod in the transfer rod, and the straight rod moves to drive an actuating side to be linked to the traction bar; and when the moving contact is separated from the static contact due to an electricexpulsive force, the sliding groove drives the transfer rod to move, in the movement process, the straight rod is limited by the rotating point in the rotating shaft, the actuating side in the transfer rod is coupled to the traction bar, and the operation mechanism is disengaged. Via the tripping device, rapid unlocking can be realized accurately, the disconnecting speed of the operation mechanism is improved, the contacts are avoided from falling, and the disconnecting speed and performance of the operation mechanism of a breaker are improved.

Description

technical field [0001] The invention relates to the technical field of circuit breaker equipment, in particular to a moving contact repelling fast tripping device. Background technique [0002] A circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a trip unit and a housing, etc. The existing low-voltage circuit breakers, especially the circuit breakers with a current-limiting function, have dynamic and static contacts when a circuit short circuit occurs. Under the action of electric repulsion, the heads will be separated in a very short time and arc will be generated. With the increase of the distance between the moving and static contacts, the electric repulsion will drop rapidly. When the electric repulsion is smaller than the reaction force of the contact spring, the During the separation process of the moving and static contacts, the moving contacts are affected by the spring tension of the moving contacts, whic...

AI Technical Summary

Problems solved by technology

However, in a large-capacity circuit breaker, due to the limitation of space, the size of the electromagnet is limited, and the electromagnet is easily saturated, which affects the action speed of the operating mechanism of the circuit breaker, causing the repelled contacts to appear again "contact drop" Therefore, for large-capacity circuit breakers, a tripping device that can be unlocked accurately and quickly after the contacts are separated due to electric repulsion is required

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