![]() The generator instability is one of reason for massive blackout in case of major fault occurs in transmission line.įor the case of synchronous motor, the angle is called torque angle and the rotating field lags the stator field in this case. This may happen when sudden change of large load occurs or fault sustains longer time. If the angle goes beyond 90º, the generator becomes unstable. ![]() This angle plays an important role for the stability of the generator. The power developed by the generator is directly proportional to sine of this angle. This lagging expressed in angle is called load angle. The stator field lags the rotating field. Load angle (or Torque angle): For a synchronous generator, the magnetic field rotates at synchronous speed and the rotating magnetic field is created in the stator. Power angle is also same in context of synchronous machines but it is more generic – also used in power transmission line. The load angle primarily used for synchronous generator and torque angle is the same thing for synchronous motor. There are three terms used in this context: Load angle, Power angle and Torque angle.
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