A study on the impact characteristics of resistive-type DC fault current limiter

DC fault current limiters can rapidly restrict the rise of fault currents， but attention needs to be paid to their dynamic current-limiting characteristics during fault impact. To address this， a study on the fault impact characteristics of a resistive-type current limiter is conducted. Firstly， mathematical expressions for the DC voltage and the withstandable fault current before and after the limiter is connected are theoretically analyzed and derived. Subsequently， a high-current DC impact platform is established， and a laboratory prototype of the current limiter is developed. A limiter model is built on the MATLAB/Simulink platform to conduct simulation analysis of the impact characteristics. Finally， high-current impact tests are performed on the resistive-type current limiters with single-coil and multi-coil parallel structures. Simulation and experimental results indicate that with increasing fault impact， the limiters’ resistance rises more rapidly and to a greater extent after reaching the critical limits， resulting in a more effective current-limiting performance. Additionally， at lower impact voltages， the current-limiting resistance exhibits a rapid rise followed by a decrease trend.