International Journal of Engineering and Information Systems (IJEAIS)   Year: 2020 | Volume: 4 | Issue: 12 | Page No.: 45-53 Study the Stability of Khartoum Ring under Different Fault Clearing Times Using NEPLAN Software Mohammed Altom, Mohammed Elmubarak Adam, Bahaaldeen Mohammed Abstract: study of the stability of any electrical system is very important to maintain the continuity of the supply to the loads, especially when symmetrical faults occur. In this scientific paper, the stability of Khartoum ring has been studied under the influence of different times in order to know the critical clearing time to eliminate the faults. The study was based on NEPLAN simulation program by selecting 0.2 seconds as fault clearing time and the faults elimination at different times. The effect was confirmed by displaying the curves of the active power, reactive power, voltages and currents.