Bidirectional Hybrid DC Circuit Breaker and Breaking Method Based on Capacitor Precharge Transfer
A DC circuit breaker and pre-charging technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of shortening the service life of high-speed mechanical switches and reducing the success of breaking rate, the circuit breaker cannot realize the rapid recovery of the insulation of the main circuit mechanical switch fracture, the quick disconnection and so on.
Active Publication Date: 2020-08-25
XI AN JIAOTONG UNIV +2
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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
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[0042] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for 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 terms are used in the specification 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. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the spe...
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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] The hybrid DC circuit breaker has the advantages of strong current capacity, fast turn-off speed, low on-state loss, and high reliability. It has been a research hotspot in the industry in recent years. With the further development of the DC power supply and distribution system, most of the loads in the new DC power supply and distribution system have the characteristics of dual properties of load and power supply. This feature causes the flow direction of current and energy in the DC grid to be uncertain. At the same time, in order to overhaul the circuit in a certain period of time, it is necessary to switch the power grid under normal working conditions. This puts forward requirements for bidirectional breaking and quick breaking of smal...
Claims
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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