Piezoelectric tripping mechanism for circuit breaker

Abstract

The invention discloses a piezoelectric tripping mechanism for a circuit breaker. The piezoelectric tripping mechanism comprises a piezoelectric tripper, a shaft, a tripping lever, a torsion spring, a lock catch plate, a tension spring, a tripping shaft, an operating mechanism and a rivet. The tripping lever, the torsion spring, a lock catch, the tension spring and the tripping shaft are mounted on the operating mechanism to form lock catch lap joint, so that the operating mechanism can realize the closing and opening of a contact system; and the piezoelectric tripper is fixedly mounted on the operating mechanism through a rivet, can directly drive the lock catch to be lapped and tripped, realizes opening of the circuit breaker, automatically resets after action, is small in size, compact in structure and quick in response, prevents a contact from falling off, and improves the current limiting coefficient, so that the sectioning capability and the flexible hinge are improved, and the impact resistance is improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a piezoelectric tripping mechanism for a circuit breaker. Background technique [0002] A circuit breaker is a power distribution device used in the power grid, which can connect, carry and break the current under normal circuit conditions, and can also be used under specified abnormal conditions (such as overload, short circuit, undervoltage and single-phase ground fault) Time) to disconnect the loop current in time to protect the system equipment from damage. Therefore, electric opening and short-circuit protection are important functions of the circuit breaker. [0003] The electric opening of the circuit breaker is realized by the shunt release, but since the shunt release usually establishes a magnetic field through the coil to drive the iron core to move, and the coil inductance is large, the inherent action of the shunt release It takes a long time to meet...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the need to install a shunt tripper and a short-circuit tripper at the same time in the existing circuit breaker. The volume is large, the speed of the tripper is slow, the breaking capacity of the circuit breaker is low, the tripper has a complex structure, and is shock-resistant. In order to solve the problems of poor performance, a piezoelectric tripping mechanism for circuit breakers is provided

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