Quick release device for low-voltage circuit breaker actuator

Abstract

The invention discloses a fast tripping device of an execution mechanism of a low-voltage circuit breaker. The fast tripping device comprises a power assisting plate, an energy storage spring, a push plate and a lock plate for locking the power assisting plate, wherein the push plate and the lock plate are rotationally arranged on a base; and when a control part of the low-voltage circuit breaker detects a fault signal, a tripping instruction is output to the execution mechanism, a flux transformer is electrified to act, a flux top rod extends outside and pushes the push plate to rotate, and the push plate drives the lock plate to rotate while rotating, the power assisting plate is unlocked after the lock plate rotates, and the power assisting plate quickly moves under the tension action of the energy storage spring, so that the push plate carries out accelerated movement and drives the circuit breaker to fast open and trip. According to the fast tripping device disclosed by the invention, the movement speed of the push plate of the execution mechanism can be increased, so that the tripping time of the circuit breaker is shortened, the breaking capacity of the circuit breaker is improved, the tripping time is shortened by 20% in comparison with that in the prior art, and the tripping efficiency is greatly improved.

Description

Technical field [0001] The invention relates to the technical field of low-voltage electrical equipment, in particular to a quick trip device of a low-voltage circuit breaker actuator. Background technique [0002] Low-voltage circuit breakers are also called automatic air switches or automatic air circuit breakers, or circuit breakers for short. It is an electrical appliance that not only has the function of a manual switch, but also can automatically protect against loss of voltage, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and automatically cut off the circuit when they have serious overload, short circuit, and undervoltage faults. Its function is equivalent to a fuse switch and Combinations of overheating and underheating relays. Moreover, it is generally not necessary to change parts after breaking the fault current, which has been widely used. [000...

AI Technical Summary

Problems solved by technology

[0004] The executive mechanism of the existing circuit breaker does not have a quick release device, and the push plate of the executive mechanism can only move under the push of the magnetic flux converter, thereby driving the circuit breaker to open. This process takes a long time to trip, which is not conducive to the operation of the circuit breaker Breaking in case of short circuit

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