Novel bridge type solid-state fault current limiter and using method thereof

Abstract

The invention relates to a novel bridge type solid-state fault current limiter and a using method thereof. The novel bridge type solid-state fault current limiter comprises a single-phase rectifier bridge unit, a current limiting unit and a circuit break unit. The single-phase rectifier bridge unit comprises thyristor valves T and diodes D. The two ends of the current limiting unit are connected to the single-phase rectifier bridge unit. One end of the current limiting unit is positioned between a cathode of the thyristor valve T1 of the single-phase rectifier bridge unit and a cathode of the diode D1, and the other end of the current limiting unit is positioned between an anode of the thyristor valve T4 of the single-phase rectifier bridge unit and an anode of the diode D2. The single-phase rectifier bridge unit and the current limiting unit together form a single-phase fault current limiter. The circuit break unit is in parallel connection with the single-phase fault current limiter. The novel bridge type solid-state fault current limiter can be automatically and quickly accessed to an electric system if the system has a short circuit fault, so the first peak value of a short circuit current is effectively limited, a current limiting effect is achieved and the requirement of fault identification is reduced. Moreover, the novel bridge type solid-state fault current limiter is simple in overall structure and low in cost.

Description

technical field [0001] The invention relates to a fault current limiter, in particular to a novel bridge-type solid-state fault current limiter. Background technique [0002] Due to the rapid development of the power system, the single unit capacity of generators, power plant capacity, substation capacity, and the load density of cities and industrial centers continue to increase, and the degree of interconnection between systems has deepened, resulting in the increase of short-circuit current levels in power grids at all levels. new question. The investment of large power sources in the load center has further accelerated the growth of the short-circuit level of the power system. The short-circuit current in some areas of the system has reached or even exceeded the breaking capacity of the circuit breaker, and the upward trend is getting faster and faster, which has seriously threatened the safe operation of the power system. . [0003] At present, the limitation of short...

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Problems solved by technology

Although the patent application significantly reduces the structure, volume and weight of the current limiter, and shortens the investment time of the current limiting reactor, it still cannot be automatically and quickly connected to the system to limit the current when the power system fails.

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