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Contingency analysis of any network involves finding out the behavior of the capability system once it is applied to a fault or any abnormality. This project includes a study of ways to find the Power Swing on a line and verification of ways to find the Power Swing supported rate of change in electrical resistance. Here, a package is needed for such an analysis as a result of the fact that in reasonable cases the mesh unit area is terribly difficult, and for the equivalent system, modeling the complete element in accordance with the real system makes it easier to access the control of the equivalent mesh while not putting it in a reasonable state. therefore, to maintain the stability of the system, this contingency analysis plays a very important role. A 3-space grid model is considered in the SIMULINK package and the simulated information is used for the analysis in this paper. the electrical resistance seen by the Distance Relay will enter a zone that is usually about one-ninetieth of the electrical resistance of the line within one cycle and will be practically stable at an electrical resistance that matches the electrical resistance seen by the relay. Whereas in the case of the Power Swing, the electrical resistance changes slowly and insists on entering the zone setting. So using this technique we are able to find the fault within one cycle. If the electrical resistance is constantly changing, we are able to block the relay.
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