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High voltage direct current breaker with multiple fractures and tandem type

A high-voltage direct current and circuit breaker technology, which is applied in the direction of DC network circuit devices, circuits, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem that the breaking capacity is difficult to improve, and achieve breaking High voltage, strong arc extinguishing ability, and good action synchronization

Inactive Publication Date: 2012-02-22
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to improve the breaking capacity of traditional single-break or double-break DC circuit breakers

Method used

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  • High voltage direct current breaker with multiple fractures and tandem type
  • High voltage direct current breaker with multiple fractures and tandem type
  • High voltage direct current breaker with multiple fractures and tandem type

Examples

Experimental program
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Embodiment Construction

[0019] The present invention takes a three-phase circuit breaker composed of three single-phase circuit breakers in series as an example, and further describes in detail the multi-break series high-voltage DC circuit breaker of the present invention in conjunction with the accompanying drawings.

[0020] The multi-fracture series high-voltage DC circuit breaker of the present invention adopts a passive superimposed oscillating current DC breaking mode, forcing the current to generate a zero-crossing point, and finally achieves the purpose of current breaking. Its structure is as figure 1 As shown, the DC circuit breaker is mainly composed of three parts: ①multi-fracture circuit breaker; ②oscillating circuit; ③energy-consuming components, multi-fracture circuit breakers are connected in parallel with the oscillating circuit and energy-consuming components respectively.

[0021] The multi-break circuit breaker in this example can be adopted by figure 2 The three-phase circuit ...

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PUM

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Abstract

The invention relates to a high voltage direct current breaker with multiple fractures and a tandem type. The breaker comprises a multi-fracture breaker, an oscillation loop and a dissipative element. The multi-fracture breaker includes a plurality of single-phase breakers and fractures of all the single-phase breaker are in series connection through connection buses; the multi-fracture breaker is respectively in parallel connection with the oscillation loop and the dissipative element through the connection buses; and a fracture of each the single-phase breaker is respectively in parallel connection with an RC equalizer circuit. According to the invention, fractures of a plurality of single-phase breakers are in series connection so as to form a multi-fracture tandem structure; effects of high drop-out voltage, heavy drop-put current and short drop-out time and the like are realized; and demands of ultra-high voltage and extra-high voltage direct current power transmission projects can be completely met. In addition, the oscillation loop in the invention is used for generating oscillation currents; the dissipative element is used for absorbing line energy and restricting overvoltages after currents are switched off; and the RC damping circuit is used for improving equalizing voltages between fractures of all the single-phase breakers.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a multi-fracture series high-voltage direct current circuit breaker. Background technique [0002] In EHV and UHV DC transmission projects, DC circuit breakers are one of the most important devices. EHV and UHV DC transmission projects have high voltage levels and large transmission capacity, so once a fault occurs, it will have a major impact on the DC system itself and the AC system connected to it, so the fault point must be removed in time. The DC circuit breaker responds quickly, which can minimize the duration of the fault and reduce the impact of the fault on the AC / DC transmission system. However, the voltage level of EHV and UHV DC transmission projects is constantly increasing, the requirements for breaking current are getting higher and higher, and the transmission capacity is constantly increasing. Correspondingly, the requirements ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H71/00H02J1/00H02H9/04
Inventor 彭畅马国华刘智刚王秀环温家良雷林旭于坤山荆平
Owner CHINA ELECTRIC POWER RES INST
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