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Ultra-fast piezo-actuated mechanical switch and method of operation for use in medium-voltage direct current systems

A piezoelectric drive, DC system technology, applied in high voltage/high current switches, electric switches, circuits, etc., can solve problems such as large space occupation, large volume, and arc generation

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The breaking of the traditional mechanical circuit breaker in the hybrid circuit breaker still produces arc; Therefore, there are great challenges for some occasions that require fast cut-off of fault current at the millisecond level and occupy a small space

Method used

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  • Ultra-fast piezo-actuated mechanical switch and method of operation for use in medium-voltage direct current systems
  • Ultra-fast piezo-actuated mechanical switch and method of operation for use in medium-voltage direct current systems
  • Ultra-fast piezo-actuated mechanical switch and method of operation for use in medium-voltage direct current systems

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Embodiment Construction

[0027] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0028] figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 Shown is an ultra-fast piezo-mechanical switch used in a medium-voltage DC hybrid circuit breaker.

[0029] The present invention is used in an ultra-fast piezoelectric-driven mechanical switch in a medium-voltage direct current system. The piezoelectric driving stack 10 is used as a driving source for receiving external control signals, and the deformation and displacement drive the switch to work. When the control signal is a positive voltage, the core piezoelectric crystal stack of the piezoelectric drive stack 10 is elongated longitudinally, and the piezoelectric drive stack 10 is displaced laterally through the enlarged frame to improve the response speed of the mechanical switch. The transmission mechanism...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H33/666H01H33/664H01H33/42
CPCH01H33/42H01H33/664H01H33/666
Inventor 王振兴李跃成曹志远闫文龙耿英三王建华刘志远
Owner XI AN JIAOTONG UNIV
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