A Series Resonant Fault Current Limiter

Abstract

The invention provides a series resonant-type fault current limiter, which comprises an electric reactor L and a capacitor bank C, wherein two ends of the capacitor bank C are sequentially connected with a metal oxide arrester MOV, a vacuum trigger switch TVS and a quick by-pass switch K in parallel and then are connected with the electric reactor L in series; the vacuum trigger switch TVS is connected with a first trigger circuit; the quick by-pass switch K is connected with a second trigger circuit; the first trigger circuit and the second trigger circuit are connected with a trigger controller; and the first trigger circuit and the second trigger circuit respectively trigger the vacuum trigger switch TVS and the quick by-pass switch K to be switched on or off under the control of the trigger controller. According to the series resonant-type fault current limiter, the structure, the volume and the weight of the current limiter can be significantly reduced under the premise of reserving the advantages of a traditional series resonant-type fault current limiter; the cost of the whole equipment and the technical difficulty of fault current limitation are reduced; and the invest time of a current limiting reactor is shortened.

Description

technical field [0001] The invention relates to a fault current limiter, in particular to a series resonance type fault current limiter based on a vacuum trigger switch TVS and a fast bypass switch K. Background technique [0002] The rapid development of the power system, the increase in the capacity of single machines and power plants, the capacity of substations, the load and load density of cities and industrial centers, and the interconnection between power systems have led to the continuous increase of short-circuit current levels in all levels of power grids in modern large power systems . With the rapid economic development, the load density increases rapidly. The investment of large power sources around the load center has exacerbated the increase in the level of short-circuit current. 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 becoming more and more obviou...

AI Technical Summary

Problems solved by technology

However, the high product cost and large footprint of the fault current limiter itself have always been the bottleneck restricting its further promotion and application.

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