A Reliable Arc Extinguishing System for Non-polar High Voltage DC Contactor

Abstract

The invention discloses a reliable arc extinguishing nonpolar high-voltage DC contactor arc extinguishing system, which comprises a sealed contact chamber of a contactor and at least two permanent magnets; two static contacts are fixedly installed in the contact chamber There are two normally open moving contacts in the activity, and the two moving contacts are vertically matched with the two static contacts; the permanent magnet is installed on the extension line side of the two static contacts, The magnetic direction of the permanent magnet is set to be non-perpendicular to the current direction between the moving and static contacts. In the present invention, by arranging special-structured arc-extinguishing magnetic blocks and heat dissipation grids in the contact chamber of the DC contactor, the electrical life times of on-load switching can be increased by more than ten times, and at the same time, the non-polarity requirement of the contacts is realized. Make the contactor with the working voltage of 200-1000V really meet the service life requirements of the complete machine of its supporting 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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