Short-circuit fault current limiter

Abstract

The invention discloses a short-circuit fault current limiter and relates to a short-circuit fault current limiter for a transmission and distribution power grid. The short-circuit fault current limiter is composed of a first electric reactor, a second electric reactor, a double-splitting electric reactor, a capacitor and a switch, wherein a first winding of the double-splitting electric reactor is connected with a second winding in parallel after being connected with the switch in series and then is connected with the capacitor in parallel, a parallel circuit is connected with the second electric reactor in series, and the whole series-parallel circuit and the first electric reactor are connected in parallel to form the short-circuit fault current limiter. According to the short-circuit fault current limiter, through the cooperation between the double-splitting electric reactor and the switch, impedance change and rapid short circuit of the capacitor are achieved during current limiting, the electric reactors are put into use fast, overcurrent impact and overvoltage impact when the double-splitting electric reactor cooperates with the switch are relieved through the parallel connection of the first electric reactor, and the operating reliability and the current limiting capacity of the limiter are improved.

Description

technical field [0001] The invention relates to a short-circuit fault current limiter, in particular to a short-circuit fault current limiter for a transmission and distribution network. 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. How...

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Problems solved by technology

The resonant current limiter is accompanied by high voltage during the current limiting process, which poses a great safety hazard

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