– Inverter-based distributed energy sources (DERs) are inverter-based distributed instruments for power, with a low current defect, negligible negative, and null series currents. In the analysis and protection of relays, an understanding of the fault properties of DER is necessary. Despite considerable work on DER modeling, no study was performed on the fault behavior of DER during actual fault events. This text addresses instances of faults of Dominion Energy. Stopper flaws are examined to show that the true response to DER errors could be different than before. A sophisticated simulation platform was used to simulate any contribution with the MATLAB setting to this analysis. Verification shall be given where the simulation findings can be checked with other results published. However, more research is needed to prototype and validates rigorously the theories built using real-world networks so that the efficiency of the contributions made to this thesis can be thoroughly evaluated