Fault detection during power swing by phase difference technique

Any disturbance in power system should be recognized by the relay placed in the network efficiently. Generally the fault detection is the major issue in the power network, and if this fault occurs during the power swing then the detection of this fault is difficult. Phase comparison of line current technique is a special form of current differential protection. Here the phase angle of each phase current takes a vital role to decide the significant change in the power network like fault, weather it is internal or external faults. This technique is also used to obtain the stable and unstable power swings by using PSCAD software in a 2-bus system. Here by taking the different percentage of transmission line length at the fault point, the fault during power swing is analyzed. This technique is faster and accurate. This method is also tested in 9-bus 3-machine WSCC power system model.