Air circuit breaker

Abstract

In an air circuit breaker provided with a make-and-break unit having a stator 11 and a blade-shaped movable element rotatably supported with a support shaft oppositely to the stator, comprising an electromagnetic operation unit having a fixed iron core provided in an upper position, a movable iron core provided in a lower position oppositely to the fixed iron core, a coil that connects / disconnects the fixed iron core and the movable iron core, and a permanent magnet; capacitors that energy-store electric power to excite the coil; a control circuit board that controls a carrying direction of a current supplied from the capacitors to the coil in response to an input command or a breaking command to the make-and-break unit; and a servo mechanism connected to the movable iron core, that transmits a driving force by the electromagnetic force of the electromagnetic operation unit to the make-and-break unit.

Description

technical field [0001] The present invention relates to air circuit breakers, and more particularly to electromagnetically operated air circuit breakers. Background technique [0002] Generally, an air circuit breaker is configured to include: an opening and closing contact part of a structure that rotates a knife-shaped movable contact element relative to a fixed current collector to switch on and off; The arc suppression device; the electromagnet for the on-off operation that drives the opening and closing contact part through the linkage mechanism; and the disconnection device that operates according to the cut-off command. [0003] Among such air circuit breakers, there are the following air circuit breakers: a knife-shaped movable contact element, a first lever mechanism connected to the movable contact element, an electromagnet for turning on operation, and a connecting member connected to the The second lever mechanism at the front end of the plunger of the electroma...

AI Technical Summary

Problems solved by technology

[0007] However, in the air circuit breaker described in Patent Document 1, since the plunger of the electromagnet is moved upward against the force of gravity and the movable contact element is driven in the cutting direction, in order to ensure the cutting speed, it has to be increased in size, and there is a restriction. The issue of miniaturization of electromagnet

In addition, as a so-called booster mechanism, since it is a structure in which two lever mechanisms are connected, there is a problem that the number of parts increases.

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