A contact structure of a commutation-type high-voltage DC contactor

Abstract

The invention discloses a contact structure of a converter-type high-voltage DC contactor, and belongs to the field of switching devices. The contact structure comprises a through-current branch composed of a main static contact A1, a main static contact A2 and an active contact M, and also comprises an arc extinguishing branch composed of six arc static contacts and three arc moving contacts. Thethrough-current branch and the arc extinguishing branch are connected in parallel through a copper conductive bridge A1B1 and a copper conductive bridge A2D2. A rectangular insulating pull rod drivesthe four groups of moving contacts to move up and down simultaneously to complete the switching operation. According to the invention, the structure can achieve the two-way rated current bearing andshort-circuit current breaking, solves a problem that the moving contact and the static contact are not concentric due to offset movement in the moving process of the switching moving contact, solvesthe problem of contact heat under a large-current-level rated state through the through-current branch circuit, and solves the problem of high-voltage-level direct-current arc breaking through the three groups of contacts connected in series of the arc extinguishing branch circuit; meanwhile, the structure reduces ablation of the main contact, and prolongs the service life of the contactor effectively.

Description

technical field [0001] The invention belongs to the field of switching appliances, in particular to a contact structure of a commutation type high-voltage direct current contactor. Background technique [0002] With the rapid development of aviation, aerospace, urban rail construction and new energy development industries, the cumulative installed capacity of wind power and solar power in my country has ranked first and second in the world. Urgent needs. Therefore, DC system switching elements that can respond quickly and have large-capacity breaking capacity have become a research hotspot. In the DC power distribution equipment, the high-power DC contactor, as a key device, plays the role of connecting, carrying and breaking normal circuit conditions (including overload operating conditions). For higher current and voltage conditions, directly cascading multiple switching devices to increase the voltage level will result in low rated current because the rated temperature r...

AI Technical Summary

Problems solved by technology

For higher current and voltage conditions, directly cascading multiple switching devices to increase the voltage level will result in low rated current due to the rated temperature rise that cannot meet the requirements

At the same time, the single fracture structure is limited by the breaking voltage

Secondly, the hybrid circuit breaker is restricted by complex structure and large volume, and cannot meet the breaking requirements of high voltage and large current at the same time.

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