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A DC circuit breaker

A technology of DC circuit breaker and main circuit breaker, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of high cost, complicated control, affecting application and promotion, etc., and achieve low cost , the effect of low expansion cost and reduced control difficulty

Active Publication Date: 2020-02-28
康成
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rated voltage of the existing DC circuit breaker is the same as the rated voltage of the branch circuit of the main circuit breaker. A large number of power electronic components need to be connected in series in the branch circuit of the main circuit breaker, and the cost is high; on the other hand, the existing DC circuit breaker uses two In the design of the outlet end, in order to realize the protection and fault isolation of all converter stations and DC lines in the DC grid, a large number of DC circuit breakers need to be arranged between the converter stations and the DC lines, and between the DC lines and the DC lines, and the control is complicated , affecting its wide application and promotion

Method used

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  • A DC circuit breaker
  • A DC circuit breaker

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Effect test

no. 1 example

[0034] Such as figure 1 As shown, when there are three outlet terminals of the DC circuit breaker, the DC circuit breaker includes three on-state current branches and three main circuit breaker branches.

[0035] The three on-state current branches are composed of a fast mechanical switch FSD and an auxiliary commutation module ASM in series; the number of the fast mechanical switch FSD is at least one; the number of the auxiliary commutation module ASM is at least one. The on-state current branch 12 is connected between the outlet terminal 1 and the outlet terminal 2; the on-state current branch 23 is connected between the outlet terminal 2 and the outlet terminal 3; the on-state current branch 31 is connected between the outlet terminal 3 and the outlet terminal between 1. When the rated voltage of the DC circuit breaker is 500kV, the rated voltage of each on-state current branch is not lower than 500kV.

[0036] The three main circuit breaker branches are all composed of ...

no. 2 example

[0046] Such as figure 2 As shown, when there are four outlet terminals of the DC circuit breaker, the DC circuit breaker includes four on-state current branches and four main circuit breaker branches.

[0047] The four on-state current branches are composed of a fast mechanical switch FSD and an auxiliary commutation module ASM in series; the number of the fast mechanical switch FSD is at least one; the number of the auxiliary commutation module ASM is at least one. The on-state current branch 12 is connected between the outlet terminal 1 and the outlet terminal 2; the on-state current branch 23 is connected between the outlet terminal 2 and the outlet terminal 3; the on-state current branch 34 is connected between the outlet terminal 3 and the outlet terminal 4; the on-state current branch 41 is connected between the outgoing terminal 4 and the outgoing terminal 1. When the rated voltage of the DC circuit breaker is 500kV, the rated voltage of each on-state current branch i...

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Abstract

The invention discloses a direct-current circuit breaker. The direct-current circuit breaker comprises N wire outlet ends (N being greater than or equal to 3), N on-state current branches and N main circuit breaker branches, wherein each on-state current branch consists of a quick mechanical switch (FSD) and an auxiliary current conversion module (ASM) which are connected in series; each main circuit breaker branch consists of main circuit breaker sub modules (SM) which are connected in series; and each main circuit breaker sub module comprises a power electric current breaking unit and an energy consuming unit. Each wire outlet end of the direct-current circuit breaker is directly connected with two on-state current branches and one main circuit breaker branch; the two ends of each on-state current branch are directly connected with two adjacent wire outlet ends of the direct-current circuit breaker; and one end of each main circuit breaker branch is directly connected with the wire outlet end of the direct-current circuit breaker, and the other end of each circuit breaker branch and other main circuit breaker branches are connected to an electric node (o). According to the direct-current circuit breaker disclosed by the invention, rated voltage of each main circuit breaker branch of the direct-current circuit breaker is only one half of the rated voltage of the direct-current circuit breaker, so that number of power and electric components and parts and equipment cost are reduced.

Description

technical field [0001] The invention relates to a direct current circuit breaker, which can be applied to conventional direct current transmission systems, flexible direct current transmission systems and hybrid direct current transmission systems, and belongs to the technical field of direct current transmission. Background technique [0002] At present, there are mainly three types of DC circuit breakers that meet the needs of DC power grids, namely mechanical DC circuit breakers, solid-state DC circuit breakers and hybrid DC circuit breakers. Mechanical DC circuit breakers have weak breaking capacity for small currents and are not easy to achieve reclosing; solid-state DC circuit breakers have large current losses; with the rapid development of high-voltage and large-capacity semiconductor components, the combination of fast mechanical switches and power electronic components The characteristic hybrid DC circuit breaker technology has been developed rapidly. The hybrid D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/087H02H3/06
CPCH02H3/066H02H3/087
Inventor 康成
Owner 康成
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