Low pressure all-purpose air breaker mechanism and control method thereof

Abstract

An mechanism and its controlling method for the omnipotence airbreak circuit breaker under voltage is provided, which comprises bi-stable magnetic actuator noumenon and subordinate link mechanism. The rods L3 and L4 are welded with the rotating shaft 3 to form a one-piece construction. After switch on of moving contact, the fifth rod and the sixth rod are in same straight line and the subordinate link mechanism converts the electromagnetic force curves of the bi-stable magnetic actuator which is favorable for overcoming returning positive moment of the super spring. When switching on, the on-and-off switch is energized, wherein the closing coil is switched to forward current while the breaking coil is switched to the backward current. When switching off, the on-and-off switch is also energized, wherein the breaking coil is switched to forward current while the closing coil is switched to the backward current. The reaction spring improves the switching-off speed. The invention realizes the high thrust generated by minute-extension bi-stable magnetic actuator by simultaneously energizing the improved bi-stable magnetic actuator, subordinate link mechanism and on-and-off switch, meeting the requirements of test on short-time withstand of power switch and fast switching on and off.

Description

technical field [0001] The invention relates to a low-voltage universal air circuit breaker mechanism and its control method, which is used to control the opening and closing operation of the low-voltage circuit breaker and automatically cut off the power supply circuit in case of a fault, and is an improvement on the existing universal air circuit breaker mechanical operating mechanism. an improvement of . Background technique [0002] Low-voltage universal air circuit breaker is one of the important components in the power distribution link of the power system. It is mainly used to break or connect the power supply circuit, and automatically cut off the faulty circuit to effectively protect the power distribution line and electrical equipment. At present, the low-voltage circuit breakers widely used in power systems are all mechanical spring-type structures, which have many parts and poor reliability. The permanent magnet mechanism has few parts, high reliability and long...

AI Technical Summary

Problems solved by technology

The moving contact stroke of the low-voltage air circuit breaker is large, which limits the application of the permanent magnet mechanism in the field of low-voltage air circuit breakers. In addition, after the low-voltage air circuit breaker is fully closed, the contact reaction force is large, so the requirement for the mechanism to maintain force It must be large; the low-voltage air circuit breaker must withstand the harsh assessment of the short-term withstand test, and a single permanent magnet mechanism cannot meet this requirement; it can quickly break the fault circuit in the event of a fault

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