Permanent magnet movable medium-low voltage circuit breaker driving device and permanent magnet movable medium-low voltage circuit breaker driving method

Abstract

The invention discloses a permanent magnet movable medium and low voltage circuit breaker driving device and method, and the device comprises an electromagnetic driving assembly and a driving strategy setting assembly which provides a self-adaptive driving strategy for the electromagnetic driving assembly. And the electromagnetic driving assembly generates a driving magnetic field at the periphery of the permanent magnet by using an electricity-to-magnetism principle to drive the permanent magnet to move axially so as to realize the opening and closing of the medium-low voltage circuit breaker. The switch-on driving winding and the switch-off driving winding are arranged to drive the permanent magnet to move axially so as to realize switch-on and switch-off operation of the medium and low voltage circuit breaker, the position of the permanent magnet can be changed axially, namely, the distance between the switch-on driving winding and the switch-off driving winding which are relatively connected with driving current is changed, and the influence of winding temperature on the permanent magnet is reduced; meanwhile, the magnetic circuit formed by the permanent magnets is continuously changed along with the change of the position, so the magnetic field in the opening and closing process can be enhanced, the magnetic field loss is reduced, and the opening and closing operation time is shortened.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a drive device and method for a medium and low voltage circuit breaker with movable permanent magnets. Background technique [0002] In the field of circuit breaker switches in power systems, the driving device of the traditional circuit breaker is composed of a mechanical spring or a mechanical latch, and at the same time, there are many windings, which increases the complexity of the driving device of the circuit breaker. Because the service life of the spring device has a certain number of years, and the mechanical latch device requires a certain response time limit, both of them are prone to malfunction or immobility of the circuit breaker, and there are certain potential safety hazards. [0003] At present, some substations and feeder protection fields in power systems use permanent magnet mechanisms to drive circuit breaker switches. For example, the prior art CN20...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a permanent magnet movable medium and low-voltage circuit breaker driving device and method to solve the problem of determining the value of the current entering the opening winding and the closing winding and the time for entering the current based on human experience in the prior art. , it is difficult to control the sensitivity and accuracy of the opening and closing operation, which leads to the reduction of the sensitivity and accuracy of the opening and closing of the circuit breaker, and ultimately affects the technical problems of the safety of the power system

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