High-voltage direct-current contactor

Abstract

The invention relates to a high-voltage direct-current contactor which is suitable for medium load systems in electrical power, metallurgy, mines, petroleum, traffic transportation and the like, and is especially suitable for a capacitor charging loop on an electric locomotive converter. The high-voltage direct-current contactor comprises an engine part, an electromagnetic drive part, a transmission part, a magnetic blow-out part, an auxiliary contact and an arc extinguish chamber, wherein the engine part is provided with a base, a main frame and a main frame cover plate; the transmission part is provide with a push rod, a reset spring, a rotary rack, a moving main contact and a moving arc contact; the electromagnetic drive part is provided with a cylindrical yoke, a movable iron core and a coil, and a lining is arranged between the cylindrical yoke and the movable iron core; and the magnetic blow-out part is provided with an iron core, a magnetic conducting iron plate, a magnetic blow-out coil, a static arc contact, an upper connecting copper bar and a static main contact. The high-voltage direct-current contactor has the advantages of long electric service life, high breaking speed, strong shock resistance capacity, compact structure, small volume, good tightness and the like, and is convenient in assembly and maintenance.

Description

technical field [0001] The invention relates to a high-voltage DC contactor, especially a high-voltage and small-capacity DC electromagnetic contactor, which is suitable for medium-load systems such as electric power, metallurgy, mining, petroleum, and transportation, and is especially suitable for capacitors on converters of electric locomotives. in the charging circuit. Background technique [0002] At present, the DC contactors used on new electric locomotives in my country mainly use electromagnetic force as the power source. Traditional electromagnetic contactor contacts generally do not have arcing contacts, and it is difficult to achieve both breaking capacity and electrical life of the contacts; since there is no commutation and arcing channel, the contacts are severely burned during the breaking process; arc extinguishing Most of the chambers adopt metal grid structure, which leads to high breaking overvoltage and poor heat dissipation, which is not suitable for fr...

AI Technical Summary

Problems solved by technology

Traditional electromagnetic contactor contacts generally do not have arcing contacts, and it is difficult to achieve both breaking capacity and electrical life of the contacts; since there is no commutation and arcing channel, the contacts are severely burned during the breaking process; arc extinguishing Most of the chambers adopt metal grid structure, which leads to high breaking overvoltage and poor heat dissipation, which is not suitable for frequent operations greater than the rated current; moreover, the contacts have no self-cleaning ability, and dust and small debris are easy to remain on the contact surface and burn marks , resulting in a substantial increase in the contact pressure drop of the circuit; the reaction force of the breaking action is mostly provided by a tension spring plus a lever mechanism, which takes up a large space and is difficult to install and adjust; the U-shaped choke iron is placed vertically, and the magnetic circuit is not well sealed, resulting in The magnetic force is lost, dust and sundries are easy to enter, and the protection level is low; the bushing is made of copper-based material, and the mechanical life is short; the arc blowing device uses a permanent magnet device, which is not conducive to non-polar current breaking, and the structure is complex, takes up a lot of space, and is difficult to install Big

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