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A motor is receiving 25% of the power that it is capable of receiving from an infinite bus. If load of the motor is doubled, then maximum value of δ during swinging of the rotor ar ound it s new equilibrium position will be
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- 40°
- > 30°
- < 30°
- 25°
Correct Option: B
sin δ0 = 0.25,
⇒ δ0 = 14.48°
sin δc = 0.5,
⇒ δ0 = 30°
or 0.5 (δm – 0.2527) = (cos δ0 – cos δm)
or 0.5 δm = cos δ0 – cos δm + 0.1263
For solution of this we make guess for δm such that δm should be greater than 30° (as δc = 30°).
After some trials, δm is found to be 45°.
