Umudike Journal of Engineering and Technology

Rotor angle analysis of multi-machine transient stability has been one of the major concerns of power system engineers due to its importance in planning and operation.  A power system is said to be stable or remain in its synchronism when it is subjected to abnormal deviation or disturbance and it returns to its normal operating condition. This paper focused on rotor angle stability of three phase fault as it records the most severity of all the faults. The three phase fault conditions analyzed were pre-fault, during fault and post fault running conditions. These were simulated at the sending end, receiving end and midpoint of the line using MATLAB/Simulink model. It was observed that the rotor angle of the three generators were stable and maintained synchronism at the fault clearing time (FCT) of 0.2 secs. The rotor angle stability for generator1, 2 and 3 were 60.363˚, 23.075˚, and 23.654˚ respectively.