Alternating current circuit breaker
An AC circuit breaker, current technology, applied in the direction of circuit devices, emergency protection circuit devices, overcurrent protection, etc., can solve the problem of limited breaking capacity and breaking speed of circuit breakers, and transient stability of large power grids Outstanding problems, to achieve the effect of easy implementation, security protection, and simple topology
Active Publication Date: 2018-09-25
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology
However, due to the limited breaking capacity and breaking speed of conventional circuit breakers, the problem of transient stability of large power grids caused by short circuits is more prominent
Method used
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[0032] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:
[0033] Such as figure 1As shown, the specific embodiment 1 of the present invention is a single-phase AC circuit breaker. The single-phase AC circuit breaker includes double-split reactor L0, fast mechanical switch K01, fast mechanical switch K02, full-control solid-state switch module Q01, full-control solid-state switch module Q02, thyristor module T01, thyristor module T02, arrester MOV01 and Lightning arrester MOV02. The double-split reactor L0 is composed of a winding L01 and a winding L02, the number of turns of the winding L01 and the winding L02 are the same, the opposite ends are connected, and the directions of the magnetic fluxes are opposite. The thyristor module T01 and the thyristor module T02 are both antiparallel combinations of two thyristor valve groups. The fully-controlled solid-state switch module Q01 and the fully-controlled ...
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The invention relates to an alternating current circuit breaker which comprises a double-split reactor and two shut-off devices. After one end of one winding of the double-split reactor and one end ofthe other winding of the double-split reactor are connected in parallel, and the other ends are connected in series with two shut-off devices. The shut-off devices share the same structure and are connected in parallel. Each shut-off device comprises a fast mechanical switch, a fully-controlled solid-state switch module, a thyristor module and a lightning arrester, and the fast mechanical switchis connected in series with the fully-controlled solid-state switch module, and then is connected in parallel with the thyristor module and the lightning arrester. The double-split reactor realizes balanced distribution of alternating current. Through the combination of the fast mechanical switches, the fully-controlled solid-state switches and the thyristors, reliable breaking of fault current isrealized. When a power grid is in steady state operation, the circuit breaker has low impedance and has little impact on the power grid. When the power grid is short-circuited, reliable breaking of the fault current is realized. The circuit breaker has strong breaking capacity, which effectively improves the safety and reliability of the operation of the power grid.
Description
technical field [0001] The invention relates to an AC circuit breaker topology, in particular to a high-voltage AC circuit breaker topology for power grids. Background technique [0002] With the rapid development of the national economy, the society's demand for electricity continues to increase, which drives the continuous development of the power system. The capacity of single machines and power plants, the capacity of substations, and the load of cities and industrial centers continue to increase, which makes the interconnection of power systems , the level of short-circuit current in the power grid at all levels is increasing continuously, and the destructiveness of short-circuit faults to the power system and its connected electrical equipment is also increasing. However, due to the limited breaking capacity and breaking speed of conventional circuit breakers, the problem of transient stability of large power grids caused by short circuits is more prominent. [0003] ...
Claims
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Login to View More IPC IPC(8): H02H7/26H02H3/08H02H3/05
Inventor 肖立业滕尚甫余修勇张志丰邱清泉韦统振张国民
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI