Current-limiting type liquid-magnet type miniature circuit breaker

Abstract

The invention provides an electro-dynamic repulsion force short circuit current-limiting releasing technology of a liquid-magnet type miniature circuit breaker which is used for the over-current protection and the short-circuit protection in power transmission and distribution process, and particularly relates to the liquid-magnet type miniature circuit breaker which is used for the over-current protection and the short-circuit protection in the power transmission and distribution. The liquid-magnet type miniature circuit breaker thoroughly solves the problems that an existing liquid-magnet type miniature circuit breaker has no short-circuit current-limiting function and is not high in breaking capacity. The electro-dynamic repulsion force short circuit current-limiting releasing technology is that an electro-dynamic repulsion force short circuit current-limiting releasing mechanism is arranged between a movable contact and a fixed contact, when a short-circuit current appears, the movable contact and the fixed contact are rapidly separated under the action of electro-dynamic repulsion force, the current in a circuit is rapidly cut off, a voltaic arc is drawn long and thin in the process of cutting off the current, a large arc resistor is formed, an arc voltage is instantly improved, therefore, an expected short-circuit current can not be completely formed, and a role of limiting a current is played. Meanwhile, a movement pushing repulsion unlocking machine of the movable contact rapidly unlocks an unlocking control mechanism to enable the movable contact not to return and to turn on a return circuit.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a liquid magnetic miniature circuit breaker with the function of short-circuit current-limiting quick release and used for over-current protection and short-circuit protection in power transmission and distribution. Background technique [0002] Existing thermal magnetic miniature circuit breakers are widely used in power transmission and distribution as overcurrent protection and short circuit protection. Thermal magnetic miniature circuit breakers have two tripping devices: a thermal time-delay tripping device and a magnetic instantaneous tripping device. The thermal time-delay tripping device responds to the current overload, and the current overload automatically activates the operating mechanism to open the circuit; the thermal time-delay tripping device is controlled by a bimetallic strip, one end of the bimetallic strip is kept fixed, and the other end is free t...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a liquid magnetic miniature circuit breaker using electric repulsion short-circuit current limiting technology, which can overcome some problems in the prior art that the liquid magnetic miniature circuit breaker has no short-circuit current limiting function and the short-circuit breaking capacity is not high. insufficient

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