Control system for permanent magnetic actuator of circuit breaker

Abstract

The invention discloses a control system for a permanent magnetic actuator of a circuit breaker. In the control system, the current size and direction in an operating coil are controlled through contactors so as to realize opening and closing operations of the circuit breaker, i.e., after a closing circuit receives a closing signal, a closing contactor coil is electrified so that two normally open contacts of the closing contactor are closed so as to switch on the operating coil and a filter energy storage circuit, then a forward current passes through the operating coil to cause magnetic field change in the permanent magnetic actuator, and a moving core in the permanent magnetic actuator moves downward to drive a main shaft to rotate so as to realize the closing operation; and after an opening circuit receives an opening signal, an opening contractor coil is electrified so that two normally open contacts of the opening contractor are closed, then a reverse current passes through the operating coil to cause magnetic field change in the permanent magnetic actuator, and the moving core in the permanent magnetic actuator moves upward to drive the main shaft to rotate so as to realizethe opening operation. In the invention, the operating voltage of the contactors is 220v so as to avoid external electromagnetic field interference and misoperation, thus the control system has the advantages of good electromagnetic compatibility and high reliability.

Description

technical field [0001] The present application relates to the technical field of permanent magnet mechanisms, in particular to a control system of circuit breaker permanent magnet mechanisms. Background technique [0002] As the operating mechanism of the circuit breaker, the permanent magnet mechanism has a simple structure, a small number of parts, no need for a mechanical tripping and locking system, fewer fault sources, and high reliability. [0003] Most of the permanent magnet mechanism control systems in the prior art are controlled by power electronic devices. For the permanent magnet mechanism with integrated opening and closing coils, the excitation current passes through the same coil regardless of the closing operation or opening operation, that is, the operation Coil, but the magnitude and direction of the current passing through the coil are different. [0004] The control system includes: an energy storage circuit composed of energy storage capacitors, which ...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the embodiment of the present application provides a circuit breaker permanent magnet mechanism control system to solve the problems of low reliability and poor electromagnetic compatibility performance of the existing circuit breaker permanent magnet mechanism control system. The technical solution is as follows:

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