Reactor type short-circuit fault current limiter

Abstract

The invention relates to a reactor type short-circuit fault current limiter, which consists of reactors, a capacitor, a switch and lightning arresters. During the stable state of an electric grid, the current limiter works at a series resonance or series compensation status and is of low impedance; and after the electric grid is subjected to short-circuit fault, windings of the reactors are saturated due to overcurrent, or meanwhile, the change of the reactance of the reactors is controlled through closing the switch, so that the current limiter generates high impedance to realize fault current limiting. According to the current limiter, the automatic fault response is realized through the saturation of the reactors, and the current-limiting capacity is improved through circuit resonance; meanwhile, the manufacture cost of a system can be greatly lowered through the reasonable design of a current limiter structure; and the current limiter is strong in current-limiting capacity and has little influence on the electric grid, and the safety and the reliability of the operation of the electric grid are effectively improved.

Description

technical field [0001] The invention relates to a short-circuit fault current limiter, in particular to a fault current limiter for transmission and distribution networks. 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. Moreover, while the demand for electric energy is increasing day by day, people also put forward higher requirements for power quality, power supply reliability and security. However, the trans...

AI Technical Summary

Problems solved by technology

Because the current limiting capacity of the PTC current limiter is too small, the resonant current limiter is accompanied by high voltage generation during the current limiting process, which has great potential safety hazards, so none of them have application prospects in the actual power grid.

When solid-state current limiters are applied in high-voltage and large-capacity systems...

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