Low-voltage DC circuit breaker and test method

A low-voltage direct current and circuit breaker technology, applied in the field of electric power, can solve the problems of lack of direct current circuit breakers, etc., and achieve the effects of reduced rise rate, low loss, and convenient production

Inactive Publication Date: 2017-06-20
GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The DC circuit breaker is an important device in the DC micro-grid system, which plays a key role in fault trippi

Method used

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  • Low-voltage DC circuit breaker and test method

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings, but not as any limitation to the present invention.

[0018] Embodiment of the present invention: a low-voltage DC circuit breaker, as attached figure 1 As shown, wind power generation, photovoltaic power generation, batteries, AC and DC loads, etc. are transformed into low-voltage DC voltages through converters, and connected to low-voltage DC busbars through DC circuit breakers. Some DC loads can be directly connected to low-voltage DC busbars. superior. The low-voltage DC bus voltage is boosted by a DC transformer and connected to the medium-voltage DC bus through a DC circuit breaker. At the same time, fuel cells, micro gas turbines, medium-voltage AC and DC loads, etc. are transformed into medium-voltage DC voltages through converters, and connected to the medium-voltage DC bus through DC circuit breakers. The medium-voltage DC bus passes through the DC / ...

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PUM

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Abstract

The invention discloses a DC circuit breaker and a test method. The DC circuit breaker is formed by connecting two current limiting reactors in series to the two ends of four parallel branches. Of the four parallel branches, the first branch is a main branch, and is composed of a mechanical switch. The second branch is a transfer branch, and is composed of a solid state switch. The solid state switch is composed of a plurality of IGBT modules connected in series. Each IGBT module is composed of two IGBTs reversely connected in series. A diode is reversely connected in parallel to each IGBT. The third branch is a buffer circuit which is composed of a resistor and a capacitor connected in series. The fourth branch is an energy absorption circuit composed of a zinc oxide arrester. The DC circuit breaker can be quickly closed in a bidirectional manner, and has the advantages of simple structure, easy manufacture and high practicality.

Description

technical field [0001] The invention relates to a DC circuit breaker and a test method, in particular to a low-voltage DC circuit breaker and a test method, belonging to the technical field of electric power. Background technique [0002] With the continuous development of the economy, due to the depletion of fossil energy and the difficulty of mining, it has also caused serious environmental problems. In recent years, new energy sources such as solar power generation, fuel cells, and wind power generation have been popularized and applied on a large scale. At the same time, a large number of DC loads such as electric vehicles, frequency conversion equipment, LED lighting, and information equipment have appeared. The DC micro-grid, as a more efficient access form of distributed power sources and DC loads, has the advantages of low line loss, large transmission capacity, long transmission distance, high power quality, and no stability problems in synchronous operation of the ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268
Inventor 杨艳周在邦戴培培潘晟黄俊
Owner GUIZHOU POWER GRID CO LTD
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