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Direct-current circuit breaker with rapid reclosing function

A DC circuit breaker and reclosing technology, applied in the field of DC circuit breakers and high-voltage DC circuit breakers, to achieve the effect of realizing the reclosing function

Inactive Publication Date: 2020-06-02
PINGGAO GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a DC circuit breaker with fast reclosing function, which is used to solve the problem of how the circuit breaker can realize the reclosing function in a short time

Method used

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  • Direct-current circuit breaker with rapid reclosing function
  • Direct-current circuit breaker with rapid reclosing function
  • Direct-current circuit breaker with rapid reclosing function

Examples

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Effect test

Embodiment 1

[0018] This embodiment provides a DC circuit breaker with a fast reclosing function that can be applied to a DC distribution network or an AC-DC distribution network system. The DC circuit breaker connects a half-controlled power device in During the breaking process, the capacitor voltage has been transferred twice. After the circuit breaker is broken, the direction of the voltage on the capacitor is consistent with the direction of the pre-charged voltage before the action, so that the circuit breaker has the ability of rapid reclosing.

[0019] The circuit schematic diagram of the DC circuit breaker with fast reclosing function is as follows: figure 1 Shown, including main current branch, current transfer branch and overvoltage limiting branch. Wherein, the main current branch includes a mechanical switch S and two anti-parallel half-controlled power semiconductor devices T1 and T2 connected in parallel with the mechanical switch S, and the anti-parallel half-controlled pow...

Embodiment 2

[0042] In order to be suitable for bidirectional power transmission DC system (power transmission can be from left to right, or from right to left), to achieve bidirectional conduction and breaking functions, it can be directly in figure 1 A semi-controlled power semiconductor device T6 is connected in antiparallel to both ends of the middle half-controlled power semiconductor device T5. At this time, the circuit schematic diagram of the DC circuit breaker with fast reclosing function is as follows: Figure 5 shown.

[0043] for Figure 5 In the DC circuit breaker with fast reclosing function, during use, if the current of the line where the DC circuit breaker is located is found to be reversed before breaking, the corresponding semi-controlled power semiconductor device can be turned on first, so that the capacitor C The voltage is reversed, and then the breaking process takes place. For example, before breaking off, if the direction of the system current changes from left ...

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Abstract

The invention relates to a direct-current circuit breaker with a rapid reclosing function. The direct-current circuit breaker comprises a main current branch, a current transfer branch and an overvoltage limiting branch, the current transfer branch comprises an oscillation branch comprising a capacitor and an inductor; and the oscillation branch is connected in parallel with a semi-controlled power semiconductor device which is triggered after the on-off process is finished. According to the invention, the semi-controlled power semiconductor device is connected in parallel with the two ends ofthe oscillation branch, after the DC circuit breaker is switched on and off, the semi-controlled power semiconductor device is triggered to be switched on, so that the oscillation branch generates self-excited oscillation, and the capacitor voltage in the oscillation branch is reversed, so that a power supply for charging the capacitor is not required to be provided additionally, the required time is short, and the reclosing function of the DC circuit breaker in a short time can be realized.

Description

technical field [0001] The invention relates to a direct current circuit breaker with fast reclosing function, belonging to the technical field of high voltage direct current circuit breakers. Background technique [0002] With the further development of the DC power supply system, the new DC system puts forward higher requirements for the reliability of power supply. Therefore, the DC system needs to quickly restore the power supply after the fault is removed, especially for the overhead line DC system, which requires the DC circuit breaker to be able to break the bidirectional short-circuit current and quickly reclose. At present, most DC circuit breakers based on pre-charged capacitors create an artificial zero-crossing point by creating an oscillating current opposite to the short-circuit current, so as to achieve the purpose of DC breaking. In this application background, DC circuit breakers used in high-reliability DC power supply systems must have the ability to perf...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/06
CPCH02H3/06H02H7/268
Inventor 庞素敏肖宇魏源张亚辉郭煜敬刘文魁王铭飞李旭旭许兴涛李永林张智辉吴益飞吴翊
Owner PINGGAO GRP
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