Abstract
This article presents the modeling of overcurrent and differential relays in MATLAB/Simulink. The overcurrent relay has the features of instantaneous, time-definite, and inverse definite minimum time (IDMT) characteristics according to IEC 60255 and IEEE C37.112-1996 standards. The 220 kV km transmission systems are selected as examples for fault simulation and relay testing for each relay model and the coordination protection. The simulation results are given and a description of how this case study can be used to compare protection schemes.
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