A double-action contact type quick switch

Abstract

The invention relates to a dual moving contact-type quick switch, which comprises a metal sealing container, symmetrical driving mechanisms vertically and sequentially arranged in the metal sealing container from inside to outside, and symmetrical buffer mechanisms connected with the symmetrical driving mechanisms, wherein the symmetrical driving mechanisms are respectively connected with a secondary control loop; the symmetrical driving mechanisms are respectively connected with a main loop; and the main loop comprises an abutting-type isolation switch arranged between the symmetrical driving mechanisms and mechanically connected with the symmetrical driving mechanisms. After the secondary control loop detects a fault or obtains an instruction, the driving mechanisms are controlled to act, and opening and closing actions of the main loop are completed via the isolation switch of the main loop mechanically connected with the driving mechanisms. The quick switch adopts dual moving switch contacts, and opening and closing action time of the quick switch is reduced.

Description

Technical field: [0001] The invention relates to a fast switch, more specifically to a double-action contact type fast switch. Background technique: [0002] Recently, advances in high-voltage direct current transmission (HVDC) systems based on voltage source converters (VSCs) have made it possible to construct a direct current power grid (DC-grid). Compared with the AC grid, the short-circuit current of the DC grid is large and the rising rate is fast, which is more harmful to the network. Therefore, a reliable high-voltage DC circuit breaker is needed to quickly remove the fault, so as to avoid the voltage unloading of the DC grid and ensure the normal operation of the converter station. In order to reduce the disturbance to the converter station, especially to reduce the impact on cables and transmission lines not connected to the fault point, the fault should be removed within a few milliseconds. [0003] Existing mechanical HVDC circuit breakers can break DC current w...

AI Technical Summary

Problems solved by technology

[0003] Existing mechanical high-voltage DC circuit breakers can break DC current within tens of milliseconds, but cannot meet the requirements of reliable DC grid due to their slow speed

Semiconductor switches used in DC circuit breakers can easily overcome the limitation of operating speed, but their transmission loss is relatively large, accounting for about 30% of the loss of voltage source converter stations. To overcome the above obstacles, a Hybrid DC circuit breaker for HVDC network

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