Abstract
This paper reveals a novel saturated iron-core fault current limiter (SICFCL). The novel SICFCL use tightly coupled structure of AC and DC windings to overcome the shortcomings of the traditional loosely coupled structure and to increase the flux transfer efficiency and improve the ratio of current limiting impedance to steady state impedance; Use the cross-parallel structure of four AC windings to eliminate the AC magnetic flux in the DC winding and prevents the AC induction voltage on the DC winding from damaging the DC components. This paper analyzes the working principle and impedance characteristic curve of novel SICFCL and establishes a simulation model of the novel SICFCL based on ANSYS finite element simulation software. The influence of novel SICFCL connected to power grid is analyzed in a typical 10kV application scenario, including the current changes in all kinds of short-circuit fault and the requirement of grid reclosing. The simulation results verify the correctness of the novel SICFCL and provide guidance for the development of the device and connected to actual power grid.
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