Self-charging on-off direct-current circuit breaker and control method thereof
A DC circuit breaker, self-charging technology, applied in the direction of automatic disconnection of emergency protection devices, circuit devices, emergency protection circuit devices, etc. The effect of shortening the removal time, reducing the volume and improving the stability
Pending Publication Date: 2022-07-15
POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD +1
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- Application Information
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Problems solved by technology
However, when the small current is broken, the injected current may reversely break down the contacts of the high-speed mechanical switch, making it difficult to extinguish the arc between the contacts of the high-speed mechanical switch when breaking, prolonging the breaking time, and adversely affecting the system
Method used
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[0025] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.
[0026] like figure 1 As shown, a self-charging and breaking DC circuit breaker includes a main current loop, a current transfer branch and an energy absorption branch; the main current loop includes a first switch S1 and a second switch S2 connected in series, and the current The transfer branch includes a first capacitor C1 and a second capacitor C2, an inductor L and a thyristor Tr, wherein the capacitance value of the first capacitor C1 is smaller than that of the second capacitor C2, and the withstand voltage values of the first capacitor C1 and the second capacitor C2 are both Greater than the turn-on voltage of the arrester in the energy absorption branch. The energy absorption branch includes a lightning arrester connected in parallel to the two ends of the second switch S2; the main current loop is drawn out through the outlet terminals A1 ...
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The invention discloses a self-charging on-off direct-current circuit breaker and a control method thereof. The self-charging on-off direct-current circuit breaker comprises a main current loop, a current transfer branch and an energy absorption branch, the main current loop comprises a first switch S1 and a second switch S2 which are connected in series, the current transfer branch comprises a first capacitor C1, a second capacitor C2, an inductor L and a thyristor Tr, and the energy absorption branch comprises a lightning arrester connected to the two ends of the second switch S2 in parallel; the novel circuit topology is designed, the capacitors are charged through arc voltage, current transfer is achieved after the thyristors are triggered, the capacitors with the two capacitance values are used for switching on and off the large current and the small current, the function of adapting to the complex working conditions of various circuit breakers is achieved, the structure is simple, on-state loss is small, and reliability is high. And the total current breaking speed is high.
Description
technical field [0001] The invention belongs to the technical field of DC circuit breakers, and in particular relates to a self-charging and breaking DC circuit breaker and a control method thereof. Background technique [0002] With the continuous advancement of urban construction, the development of high power supply density, large capacity, and high reliability DC power distribution system has become an urgent need for the development of large and medium-sized cities. The operating conditions of some special power systems are complex. The traditional DC circuit breaker, due to its long breaking time and limited current limiting capacity, cannot take into account the limitations of different working conditions and other characteristics at the same time, and it is difficult to adapt to the development needs of high voltage and high current of the DC system. [0003] Compared with the traditional AC system, the short-circuit fault of the DC system has the characteristics of...
Claims
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Login to View More IPC IPC(8): H02H7/26H02H3/087H02H3/02
CPCH02H7/268H02H3/087H02H3/021
Inventor 牛博成林杨鼎革郭子豪韩彦华蒲路吴经锋齐卫东王鸿王森谷永刚陈维刘子瑞薛军李鹏程袁福祥李良书杨博万康鸿左坤李旭王辰曦吴子豪唐露甜李毅张晓兰李文慧高健徐丹唐子卓师愉航边赫卢一晗
Owner POWER RES INST OF STATE GRID SHAANXI ELECTRIC POWER CO LTD