I need to calculate the slip of an induction generator during a fault at the terminal of the machine, without the knowledge of the rotational speed of the machine. It can be assumed the mechanical torque is known and stays constant during the fault. Also, the steady-state generated power at the pre-fault instant is known. Any help on this regard would be great.
Dear Mr. Soudipan, Just as you do in fault analysis, based on an equivalent circuit using pu values, you can find the acceleration of the rotor and the consequent speed, after the required time gap. This should give you an idea or a rough computation of the slip. Unfortunately, the machine reactance values also change due to all the dynamism set up at fault on the terminals of the induction generator
In fault conditio, it work as induction motor in unstable region of it slip-torque ch. and rotor would be at stand still with S=1...
You can calculate the rotor current frequency (fr) at healthy or faulty machines. the stator frequency is already known (fs), therefore the machine slip equal (s=fs/fr).
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