Reliable arcing system of non-polarity high-voltage direct current contactor

Abstract

The invention discloses a reliable arcing system of a non-polarity high-voltage direct current contactor. The reliable arcing system of the non-polarity high-voltage direct current contactor comprises a sealed contact chamber of the contactor and at least two permanent magnets, wherein two fixed contacts are fixedly installed in the contact chamber, two normally-opened movable contacts are movably installed in the contact chamber, and the two movable contacts and the two fixed contact are matched correspondingly in the vertical direction respectively; the permanent magnets are installed on the side of the extension line of the connection line of the two fixed contacts, and the magnetic direction of the permanent magnets is set not to be perpendicular to the current direction between the movable contacts and the fixed contacts. The arcing magnets and heat dissipation grid pieces of a special structure are arranged in the contact chamber of the direct current contactor, so that the electric service life of load switching can be prolonged by more than ten times, meanwhile, the non-polarity requirement of the contacts is met, and the contactor of the working voltage of 200-1000V can really meet the requirement for service life of whole matched equipment.

Description

technical field [0001] The invention relates to a DC contactor, in particular to a reliable arc extinguishing non-polarity high voltage DC contactor arc extinguishing system. Background technique [0002] At present, with the continuous development of science and technology, industries such as electric vehicles, construction machinery, solar energy, and wind energy equipment tend to adopt DC power systems above 200-750VDC to provide higher power. [0003] The existing DC contactor with the best performance is a sealed contactor. Although a number of related public technologies can realize switching operations under high-power loads, the number of times the on-load switching is generally low , especially under the load conditions above 200A320VDC, the working life can only be achieved thousands of times, and the overload condition and reverse current will significantly reduce the working life times, seriously affecting its reliability as a main power switch, resulting in its ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a reliable arc extinguishing non-polar high-voltage DC contactor arc extinguishing system, which can solve the problem of the existing sealed DC contactor under the condition of 500-1000V class and 200A or more high-power load. The switching life is low, and it cannot bear the defects of reverse current switching; and it has the characteristics of compact structure, realizing the smallest volume among contactors with the same capacity, and saving installation space

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