Ultra-fast piezoelectric driving mechanical switch used in a medium-voltage direct-current system and working method

A piezoelectric drive, DC system technology, applied in the direction of high-voltage/high-current switches, electric switches, circuits, etc., can solve the problems of arc generation, large volume, and large space occupation, and achieve high breaking level, small volume, and occupation small space effect
CN110828231AActive Publication Date: 2020-02-21XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2020-02-21

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Abstract

The invention discloses an ultra-fast piezoelectric driving mechanical switch used in a medium-voltage direct-current system and a working method. The mechanical switch comprises an insulating shell,a transmission mechanism, a frame connecting rod, a contact connecting rod, a stroke amplifying frame, an element fixing block, a piezoelectric driving stack, a signal lead terminal, a contact fixingplate, a spherical contact, an outer conductor, a wiring terminal and a shell spherical contact. The mechanical switch adopts a piezoelectric driver as a driving source, and is suitable for a medium-voltage direct-current power supply system. When a short-circuit fault occurs in the system, a circuit breaker signal is transmitted to a circuit breaker signal wiring terminal, the piezoelectric driver receives a voltage signal and deforms, the transmission mechanism is driven by a pull rod to separate the contacts so as to achieve a breaking effect, and the transmission mechanism plays a role intransmission and displacement amplification at the same time. Compared with a common circuit breaker, the whole breaking process is high in response speed, and the volume is compact and small.
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Description

technical field

[0001] The invention relates to a piezoelectric mechanical switch in a hybrid circuit breaker when a short-circuit fault occurs in a DC power grid, in particular to an ultra-fast switch in a vacuum interrupter, fast breaking, compact volume, and used in a medium-voltage DC system. Fast piezo-actuated mechanical switch and method of operation. Background technique

[0002] Compared with the traditional three-phase AC power transmission, the DC power transmission and distribution system has greater advantages in long-distance power transmission. Even in some specific applications, DC transmission networks are superior to AC transmission in terms of efficiency, flexibility and cost. Nowadays, DC transmission is increasingly used in the United States, Japan, Germany, China and other countries. In addition, independent power systems such as ships, subways, and wind power generation also use DC power systems.

[0003] In the DC system, the DC circuit breaker has...

Claims

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