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Bidirectional hybrid DC circuit breaker based on capacitor pre-charge transfer and breaking method

A DC circuit breaker and pre-charging technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem of reducing the success rate of breaking and reducing the use of high-speed mechanical switches Life, circuit breakers can not achieve the main circuit mechanical switch fracture insulation fast recovery and fast breaking and other issues

Active Publication Date: 2019-11-15
XI AN JIAOTONG UNIV +2
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Moreover, the traditional circuit breaker cannot realize the rapid recovery of the main circuit mechanical switch fracture insulation and the rapid breaking under different working conditions, that is, the rated working condition and the short-circuit working condition, which greatly reduces the success rate of breaking and reduces the capacity of high-speed machinery. switch lifetime

Method used

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  • Bidirectional hybrid DC circuit breaker based on capacitor pre-charge transfer and breaking method
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Embodiment Construction

[0042] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0043] It should be noted that certain words are used in the description and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. This specification and claims do not use differences in terms as a way to distinguish components, but use differences in functions of components as a criterion for distinguishing. If "include...

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Abstract

A bidirectional hybrid DC circuit breaker based on capacitor pre-charge transfer and a breaking method are disclosed. The DC circuit breaker includes a main current circuit, a breaking freewheeling branch, a current transfer branch, an overvoltage limit branch, an online monitoring system, a control system, an outlet terminal C1 and an outlet terminal C2. The main current circuit, the breaking freewheeling branch, the current transfer branch and the overvoltage limit branch are connected in parallel and are led out by the outlet terminal C1 and the outlet terminal C2. The two ends of the breaking freewheeling branch are connected in parallel to the two ends of the main current circuit. The breaking freewheeling branch includes a semi-controlled power semiconductor device VT1 and a semi-controlled power semiconductor device VT2 which are reversely connected in parallel, and the two semiconductor devices constitute a branch and are then connected in parallel with the main current circuit. The DC circuit breaker has the abilities of bidirectional conduction, fast recovery of fracture insulation and simultaneous and fast breaking of a short-circuit high current and a low current (suchas a rated current), and can be applied to a DC power supply system having the ability of two-way current flow and requiring fast and reliable breaking of currents of different magnitudes.

Description

Technical field [0001] The invention relates to the field of circuit breakers, in particular to a bidirectional hybrid DC circuit breaker based on capacitor precharge transfer and a breaking method thereof. Background technique [0002] Hybrid DC circuit breakers have the advantages of strong current flow capacity, fast turn-off speed, low on-state loss, and high reliability. In recent years, they have been a research hotspot in the industry. With the further development of the DC power supply and distribution system, in the new DC power supply and distribution system, most loads have the characteristics of dual attributes of load and power. This feature causes the current and energy flow in the DC grid to have uncertain characteristics. At the same time, in order to overhaul the circuit within a certain period of time, it is necessary to switch on and off the power grid under normal working conditions. This puts forward the requirements of bidirectional breaking and fast break...

Claims

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Application Information

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IPC IPC(8): H02H3/087H02H9/02H02H9/04
CPCH02H3/087H02H9/02H02H9/04
Inventor 纽春萍魏源吴翊杨騉荣命哲吴益飞
Owner XI AN JIAOTONG UNIV
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