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Mixed type direct current breaker

A DC circuit breaker, a hybrid technology, applied in the direction of circuits, electrical components, electrical switches, etc., can solve the problems of unable to shut off the current, the breaking time is difficult to meet the DC transmission system, etc., to ensure safety, small loss, reduce effect of influence

Active Publication Date: 2014-06-04
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system to shut down like the AC system. The breaking of the DC current has always been a topic worth studying.
The hybrid circuit breaker manufactured by using this principle has special requirements for mechanical switches, and it is difficult to meet the requirements of the DC transmission system in terms of breaking time.

Method used

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Examples

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Effect test

Embodiment 1

[0039] figure 1 Shown is Example 1 of the present invention. like figure 1 As shown, the present invention includes a first inductor 16, a first mechanical switch 17, a first capacitor 24, a second mechanical switch 18, a first electronic switch 19, a second capacitor 15, a second electronic switch 13, and a third electronic switch 14 , a voltage limiter 27 , a third capacitor 25 , a third mechanical switch 20 , a second inductor 21 , a fourth electronic switch 23 , a fourth capacitor 26 and a third inductor 22 . The second lead-out terminal of the first inductor 16 is connected to the first lead-out terminal of the first mechanical switch 17, the first lead-out terminal of the first capacitor 24, the second lead-out terminal of the first mechanical switch 17 and the first lead-out terminal of the second mechanical switch 18 One lead-out terminal is connected as the first connection point 2, the second lead-out terminal of the second mechanical switch 18 is connected with th...

Embodiment 2

[0043] figure 2 Shown is Example 2 of the present invention. like figure 2 As shown, the present invention includes a first inductor 16, a first mechanical switch 17, a first capacitor 24, a second mechanical switch 18, a first electronic switch 19, a second capacitor 25, a third mechanical switch 20, a second inductor 21, The second electronic switch 23 , the third capacitor 26 and the third inductor 22 . The second lead-out terminal of the first inductor 16 is connected to the first lead-out terminal of the first mechanical switch 17, the first lead-out terminal of the first capacitor 24, the second lead-out terminal of the first mechanical switch 17 and the first lead-out terminal of the second mechanical switch 18 One lead-out terminal is connected as the first connection point 2, the second lead-out terminal of the second mechanical switch 18 is connected with the first lead-out terminal of the first electronic switch 19, the second lead-out terminal of the first elec...

Embodiment 3

[0046] image 3 Shown is Example 3 of the present invention. like image 3 As shown, the present invention includes a first inductor 16, a first mechanical switch 17, a first capacitor 24, a second mechanical switch 18, a first electronic switch 19, a second capacitor 15, a second electronic switch 13, and a third electronic switch 14 , a voltage limiter 27 , a third capacitor 25 , a third mechanical switch 20 and a second inductor 22 . The second lead-out terminal of the first inductor 16 is connected to the first lead-out terminal of the first mechanical switch 17, the first lead-out terminal of the first capacitor 24, the second lead-out terminal of the first mechanical switch 17 and the first lead-out terminal of the second mechanical switch 18 One lead-out terminal is connected as the first connection point 2, the second lead-out terminal of the second mechanical switch 18 is connected with the first lead-out terminal of the first electronic switch 19, the second lead-o...

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PUM

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Abstract

A mixed type direct current breaker is composed of mechanical switches (17, 18 and 20) and power electronic devices (16, 19, 13, 14, 15, 21, 22, 23, 24, 25, 26 and 27). When direct current high-voltage transmission lines run normally, a low-loss current path is formed through the mechanical switches (17, 18 and 20) and the power electronic devices (16, 19, 13, 14, 21 and 22), and when the direct current high-voltage transmission lines break down, rapid disconnection is achieved through an electronic switch (19), and therefore rapid disconnection of the mechanical switch (18) under a zero current situation is achieved. The problem that a capacitor (15) and an inductor (22) cause current turn-off time to be long in an oscillation process is solved through control of power electronic circuits (13, 14, 15, 27, 21, 22, 23 and 26), and rapid tuning-off of fault currents is achieved.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a hybrid DC circuit breaker topology. Background technique [0002] Fast DC circuit breaker is one of the key equipment to ensure the safe, stable and reliable operation of DC power transmission and distribution system and DC grid. Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system to shut down like the AC system. The breaking of the DC current has always been a topic worth studying. [0003] At present, there are usually two ways to break the DC current. The first is a pure power electronic circuit breaker, such as the patent CN102870181A applied by ABB, which can turn off the power electronic device by using high power and directly break the DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the ...

Claims

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Application Information

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IPC IPC(8): H01H9/54
Inventor 肖立业韦统振霍群海王珏朱晋齐智平李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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