Hybrid short-circuit fault current limiter and current limiting method

Abstract

The invention relates to a hybrid short-circuit fault current limiter and a current limiting method. The hybrid short-circuit fault current limiter comprises a current transfer branch and a fault current limiting branch, wherein the current transfer branch comprises a rapid mechanical switch and a power electronic switch in series. In a steady state, a current passes through the current transfer branch, and the loss during normal running is reduced; when a fault occurs, a switch on the transfer branch acts, and the current is transferred to the fault current limiting branch; the fault currentlimiting branch comprises a dual-split reactor and a switch, and a first winding of the dual-split reactor is connected in series with the switch and is connected in parallel with a second winding; the switch is switched on in the steady state, and the fault current limiting branch shows low impedance; and the switch is switched off when the fault occurs, and the fault current limiting branch shows high impedance. By matching of the current transfer branch and the fault current limiting branch, the loss of the current limiter during normal running is reduced, meanwhile, fault current limitingis achieved by the dual-split reactor, and running economy and reliability of the current limiter are improved.

Description

technical field [0001] The invention relates to a hybrid short-circuit fault current limiter and a current limiting method, belonging to the technical field of fault current limiting of transmission and distribution networks. Background technique [0002] The rapid development of the national economy has led to the continuous growth of the society's demand for electricity, and the traditional transmission and distribution network is difficult to meet the system capacity requirements. At the same time, the requirements for power quality in large cities, industrial centers and residential buildings are also more stringent. In order to solve the above problems, the power system needs to be continuously upgraded. The voltage level of the power system is getting higher and higher, the power capacity is getting bigger and bigger, and the interconnection between the power systems in various regions is getting stronger and stronger, which makes the level of short-circuits in the po...

AI Technical Summary

Problems solved by technology

Although this method can quickly and reliably limit the fault current, due to the fact that more reactors are connected in series in the steady state, the loss in the on-state is too high

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