DC contactor and contact structure thereof

Abstract

The invention relates to the technical field of DC contactors, and provides a contact structure for a DC contactor. The contact structure comprises a moving contact mechanism and a static contact mechanism, wherein the moving contact mechanism comprises a moving contact assembly and a first busbar, the static contact mechanism comprises a static contact and a second busbar, and the static contactis positioned within a moving trajectory range of the moving contact assembly; the second busbar and the moving contact assembly are both L-shaped structures, the two L-shaped structures each have anopening, and both openings have the same orientation. The invention further provides a DC contactor. Through setting the moving contact assembly into an L shape and restricting placement directions ofthe second busbar and the moving contact assembly to be identical, the DC contactor can ensure that an electro-dynamic repulsion force generated between one segment of the moving contact assembly andthe first busbar can cancel an electro-dynamic repulsion force generated between the other segment of the moving contact assembly and the first busbar when the moving contact assembly is in contact with the static contact assembly, namely, during switching-on current flow, thereby greatly reducing contact pressure required by a contact point portion.

Description

technical field [0001] The invention relates to the technical field of DC contactors, in particular to a DC contactor and its contact structure. Background technique [0002] In the DC traction power supply system, in order to reduce the contact voltage and step voltage between the car body and the ground, rail potential limiting devices are generally installed at stations and yards with traction substations. The running rail is connected to the grounding busbar of the substation, which is a protective measure commonly used in the world to protect personal safety. The normally closed contactor in the rail potential limiting device plays a key role. In addition to requiring the contactor to frequently break the rated current and critical current, it also needs to withstand a short-circuit current that is more than three times that of a contactor of the same level. [0003] In the existing DC contactor contact structure on the market, the moving contact components are usually...

AI Technical Summary

Problems solved by technology

[0003] In the existing DC contactor contact structure on the market, the moving contact components are mostly arranged in strip shape. When the switch is closed and the current flows, the contact pressure required by the contact part of the moving contact component is too large, and the electric repulsion force To solve this defect, multi-pole contacts need to be connected in parallel to withstand a large short-circuit current, which will lead to problems such as excessive contactor volume, excessive operating power, and high cost.

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