DC socket

Abstract

An embodiment of the present invention provides a DC socket, comprising: a housing having a receiving slot and an opening communicating with the receiving slot, the moving contacts of the DC socket can be inserted into the receiving slot; the static contacts are distributed in the receiving slot; the electrodes are distributed in the receiving slot The accommodating groove, the electrode is electrically connected with the static contact, and is located on the side of the static contact away from the opening, so that when the moving contact enters the accommodating groove from the opening, it can be connected with the static contact and the electrode in turn; the current limiter , electrically connected between the static contact and the electrode. The embodiment of the present invention can eliminate the arc generated when the plug is inserted into or pulled out of the DC socket.

Description

technical field [0001] The invention relates to the technical field of DC circuit power devices, in particular to a DC socket. Background technique [0002] With the extensive application of photovoltaic power generation and new energy vehicles, there are more and more applications of DC sockets and plugs. There is a big difference between DC characteristics and AC characteristics. There is a periodicity in alternating current, and both voltage and current have zero-crossing points. Although the plug also generates an arc when it is inserted and pulled out of the socket, because of the characteristic of zero-crossing point, the arc will extinguish itself after a short period of time; but the direct current is different. , DC has no periodicity, and it will not extinguish itself after the arc is generated. It needs external conditions to extinguish the arc. The existence of arc prolongs the time for the switching device to break the fault circuit, which makes the power syst...

AI Technical Summary

Problems solved by technology

There is a periodicity in alternating current, and both voltage and current have zero-crossing points. Although the plug also generates an arc when it is inserted and pulled out of the socket, because of the characteristic of zero-crossing point, the arc will extinguish itself after a short period of time; but the direct current is different. , DC has no periodicity, it will not extinguish itself after the arc is generated, and it needs external conditions to extinguish the arc

The existence of the arc prolongs the time for the switching device to break the fault circuit, which makes the power system have the hidden danger of short circuit fault

Moreover, high temperatures will be generated on the surface of the arc, which will cause electric corrosion on the reeds and plugs of the electrical socket, greatly shortening the service life of the socket and the plug; the arc in the oil-filled electrical equipment may also cause the danger of fire and explosion

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