Rapid opening mechanism and mixed AC breaker

Abstract

The invention discloses a rapid opening mechanism and a mixed AC breaker. The rapid opening mechanism comprises a permanent magnetic mechanism, vacuum arc-extinguishing chamber mechanisms, spring connection mechanisms and electromagnetic repulsion mechanisms; the permanent magnetic mechanism realizes opening and closing operations and provides opening and closing maintaining force; the vacuum arc-extinguishing chamber mechanisms are arranged under the permanent magnetic mechanism, comprise vacuum arc-extinguishing chambers, and are used to extinguish arcs and inhibit current rapidly after circuit break; the permanent magnetic mechanism is connected with the vacuum arc-extinguishing chambers via the spring connection mechanisms, and the spring connection mechanisms provide a contact pressure for a moving contact in a closing state; and the electromagnetic repulsion mechanisms provide a force enabling upward movement of the moving contact, and cooperate with the permanent magnetic mechanism to realize the opening operation and maintain an opening state. According to the mixed AC circuit breaker including the rapid opening mechanism and a forced commutation technology, the opening speed of the circuit breaker can be improved greatly, arc time is shortened, contact burning is reduced, and the electric service life of the contact is prolonged.

Description

technical field [0001] The invention relates to the technical field of medium and low voltage AC circuit breakers, in particular to a quick opening mechanism of an AC circuit breaker. Background technique [0002] The circuit breaker is an indispensable basic industrial product and key electrical product in the power system. Its task is to close and close the load current and break the short-circuit fault current, so as to protect the power grid and the electrical equipment on the circuit from damage. Therefore, the reliability and speed of the circuit breaker are of paramount importance. As the core component of the circuit breaker, the circuit breaker operating mechanism will affect the overall performance of the entire switch. Traditional operating mechanisms mainly include electromagnetic operating mechanisms, spring operating mechanisms and permanent magnetic operating mechanisms. [0003] With the development of power system technology, the power system has higher an...

AI Technical Summary

Problems solved by technology

The existing traditional AC circuit breaker operating mechanism is limited by technology, design, and structure, and the opening speed cannot meet the needs of seamless switching of the system;

[0007] 3. The traditional AC circuit breaker uses natural zero-crossing arc extinguishing. From the occurrence of short circuit to the natural zero-crossing of the current, the short-circuit current lasts for a long time, and the high current seriously affects the normal operation of other equipment in the power system and even fails.

Moreover, the arc has serious ablation on the contacts, which affects the life of the contacts

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