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21.Define critical clearing angle22. Define critical clearing time.23. What are the assumptions that are made inorder to simplify the computational task in stability studies?24.What is Multimachine stability?25. What is meant by an infinite bus?26.List the assumptions made in multimachine stability studies.27. Explain the concept synchronous speed.
35The mechanical torque Tm and the electrical torque Te are considered positive for synchronous generator. Tm is the resultant shaft torque which tends to accelerate the rotor in the positive θm direction of rotation . Under steady-state operation of the generator Tm and Te are equal and the accelerating torque Ta is zero. Hence there is noacceleration of deceleration of the rotor, masses and the resultant constant speed is the synchronous speed.Possible16marks