Mechanical breaking and fusing combined multi-fracture excitation fuse

Abstract

A mechanical breaking and fusing combined multi-fracture excitation fuse is characterized in that the mechanical breaking and fusing combined multi-fracture excitation fuse comprises a shell, a cavityis formed in the shell, and at least one conductor is arranged in the shell in a penetrating mode and penetrates through the cavity; at least one excitation device and a breaking device are arrangedin the cavity of the shell; the excitation device can receive an external excitation signal to drive the breaking device to act so as to disconnect the corresponding conductor and form at least two fractures on the conductor; at least one melt is arranged on the conductor in parallel; and the melt is connected with at least one fracture in parallel, and the melt is connected with at least one fracture in series. According to the excitation fuse, the breaking capacity and the arc extinguishing capacity are improved under the condition of ensuring that a circuit is disconnected.

Description

technical field [0001] The invention relates to the fields of power protection, control and electric vehicles, in particular to a fuse that cuts off a current transmission circuit controlled by an external signal. Background technique [0002] The fuse for circuit overcurrent protection is based on the heat generated by the current flowing through the fuse. The main problem is that the current of melting and vaporizing the melt and the heat generated by the load passing through the melt are distinguished by temperature differences. Principle constraints: Due to the heat generation of the withstand current and the heat generation and melting of the breaking current, they all originate from the current flowing through the melt of the fuse. Under the condition of short-term overload / impact current (such as short-time high current when electric vehicles start or climb), a certain amplitude fault current cannot reach a fast enough breaking protection speed; on the other hand: und...

AI Technical Summary

Problems solved by technology

However, it has some serious deficiencies and defects: it is limited by the overcurrent of the fracture and arcs in the air, it is difficult to extinguish the fault current arc of a large value, or requires a large space volume; the arc is cooled and broken by air, and it is extinguished by air pressure, The influence of temperature, humidity, air impurities, etc. is great, and the reliability is not good; during the breaking process, the arc directly burns the head of the piston, and the burning damage will affect the smooth extinguishing of the arc; if the air in a small volume space extinguishes the large-value current arc, The insulation resistance after breaking is also relatively low, resulting in the need for a large volume for arc extinguishing, etc.

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