Medium-voltage phase selection closing switch

Abstract

The invention discloses a medium-voltage phase selection closing switch, which comprises an intelligent phase selection controller and a medium-voltage phase selection closing switch. The intelligentphase selection controller and the medium-voltage phase selection closing switch are connected through a cable. The medium-voltage phase selection closing switch is formed by a frame, vacuum arc-extinguishing chambers, upper insulation structural members, insulation pull rods, lower insulation structural members and permanent magnet operating mechanisms. Each vacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller. Eachvacuum arc-extinguishing chamber is driven by the separate permanent magnet operating mechanism, and is corresponding to one independent permanent magnet operating mechanism driving loop in the intelligent phase selection controller; and the medium-voltage phase selection closing switch is easy to operate, long in life and high in action reliability.

Description

Technical field [0001] The invention belongs to the technical field of intelligent phase selection and closing switches, and more specifically, relates to a medium voltage phase selection and closing switch capable of realizing test currents that meet standard requirements. Background technique [0002] With the development and popularization of power electronic device applications, people have developed thyristor switches (solid state relays) with thyristor as the core. The principle is to pass the voltage and current zero-crossing detection control to ensure that the phase selection is input near the voltage zero zone to generate the maximum closing peak current, which functionally meets the most basic requirements of the phase selection switch. However, electronic devices have fatal weaknesses in application: their own electrical losses are large, and they need to be dissipated to avoid thermal breakdown of the PN junction. In order to cool down, they need to use a large area ...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the high-voltage and high-current phase-selection closing switches used in China use foreign products. Foreign products adopt pneumatic control methods. Because they do not use permanent magnet mechanism technology, they are bulky, complicated to control, and extremely expensive. high, short service life

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