Small-size direct current breaker

Abstract

The invention provides a small-size direct current breaker, comprising a shell, a handle, an operation mechanism, a thermal releaser unit, a magnetic releaser unit, a movable contact, a stationary contact, an arc extinguish chamber, a controller, a loop current detection unit, a leak current detection unit and a breaker state monitoring unit, wherein the loop current detection unit achieves detection on the main loop current of the small-size direct current breaker; the leak current detection unit achieves detection on the main loop leak current of the small-size direct current breaker; the breaker state monitoring unit detects the fault alarming state, ON state and OFF state of the small-size direct current breaker; and the controller sends the information of the loop current, loop leak current, fault alarm state and ON state or OFF state of the small-size direct current breaker to an external monitoring system. According to the small-size direct current breaker of the invention, the basic function of the breaker and monitoring on the loop current and leak current, ON or OFF state and fault alarm state of the breaker can be achieved.

Description

technical field [0001] The invention relates to the field of electric circuits, and more specifically relates to a small direct current circuit breaker. Background technique [0002] In DC power systems, small DC circuit breakers are widely used. Usually, small DC circuit breakers, DC leakage transformers, current sensors, line fault alarm units, and circuit breaker closing / opening state monitoring units are relatively independent, which is reflected in the "occupied area" on the DC screen panel and in the DC screen cabinet The body "takes up space". [0003] The existing line fault alarm unit and / or circuit breaker closing / opening state monitoring unit must be assembled on the side of the small DC circuit breaker. The width of the overall product will affect the compactness of the DC panel cabinet structure, resulting in Body size increases. [0004] Usually, for small DC circuit breakers, an external DC leakage transformer is used to realize the circuit leakage current ...

AI Technical Summary

Problems solved by technology

[0006] Patent document CN 201044352 Y proposes an intelligent miniature circuit breaker, which is provided with a main circuit board, a load current transformer, a zero-sequence current transformer, an instantaneous shunt trip circuit breaker, a lightning protection module, a voltage transformer, a fault Indication and buttons control the circuit board and signal communication port to realize the diversity of functions, but its thickness is the sum of the thickness of four miniature circuit breakers, which is relatively large and still needs to occupy a large internal space of the power distribution cabinet

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