Arc extinguishing device of circuit breaker with reverse current protection

Abstract

The invention discloses an arc extinguishing device of a circuit breaker with reverse current protection, comprising a static contact, a movable contact, an arc extinguishing chamber, an arc chute, a static contact starting weld tab and a movable contact starting weld tab, wherein the arc extinguishing chamber is located below the static contact; the arc chute is put in the arc extinguishing chamber; the static contact starting weld tab and the movable contact starting weld tab extend to two ends of the arc chute from the static contact and the movable contact respectively; the static contact is electrically connected with an incoming wire binding post; and one side of the movable contact is provided with an outgoing wire binding post and a bimetallic element which is connected with the movable contact through a first flexible connection wire. The arc extinguishing device of the circuit breaker with the reverse current protection is characterized in that a wiring board is fixed on the outgoing wire binding post; and an electromagnetic field generation device which is located on one side of the arc extinguishing chamber is connected in series between the wiring board and the bimetallic element. With the adoption of the arc extinguishing device of the circuit breaker with the reverse current protection, the electric arc of reverse current generated during the breaking of the circuit breaker can be led to the arc extinguishing chamber to be extinguished rapidly and effectively, so that the applicability of the circuit breaker in a direct current circuit of a photovoltaic power generation system is promoted greatly; and meanwhile, the operation safety and reliability of the direct current circuit of the photovoltaic power generation system are enhanced as well, and the circuit cost is decreased.

Description

technical field [0001] The invention relates to a circuit breaker arc extinguishing device with reverse current protection. Background technique [0002] When the circuit breaker breaks the circuit, the arc generated between the contacts may delay the breaking time of the circuit breaker, burn the contacts, and even cause fire and explosion in severe cases. For this reason, arc extinguishing devices are installed in the circuit breaker. This arc extinguishing device is mainly composed of an arc extinguishing chamber located below the static contact, an arc extinguishing grid placed in the arc extinguishing chamber, and arc strike plates extending from the static and moving contacts to both ends of the arc extinguishing grid. Among them, the static contact is connected to the incoming line terminal, while the moving contact is connected to the outgoing line terminal through the flexible connecting wire, the bimetal element and the terminal board in turn, and the bimetal eleme...

AI Technical Summary

Problems solved by technology

[0003]In the existing photovoltaic power generation system, when the battery panel is blocked or a fault causes a photovoltaic string to fail, a current sink that flows in the opposite direction relative to the standard condition Or release the electric energy generated by other photovoltaic strings connected in parallel to the inverter, so that the normal photovoltaic string feeds a high reverse current to the faulty photovoltaic string. A circuit breaker must be installed to ensure electrical safety

However, the current circuit breaker installed in the DC circuit of the above-mentioned photovoltaic power generation system lacks the function of protecting against reverse current, so that the reverse current arc generated after the circuit breaker is broken cannot enter the arc extinguishing chamber, which may cause the circuit breaker to explode.

The existing solution is to add another set of reverse current protectors in the line, but the cost is too high

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