The shaft of a three-phase synchronous generator is rotating at 3000 RPM synchronous speed. This generator is supplying a load of 40 KW, 0.8 PF lagging, with an efficiency of 75 %. The copper losses are neglected. Calculate the sum PF&W + Pcore + P stray Answer: The sum PF&W + Pcore + Pstray is: KW.

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The shaft of a three-phase synchronous generator is rotating at 3000 RPM synchronous speed.
This generator is supplying a load of 40 KW, 0.8 PF lagging, with an efficiency of 75 %.
The copper losses are neglected.
Calculate the sum PF&W + Pcore + Pstray
Answer:
The sum PF&W + Pcore + Pstray is:
A 2300 V, 400 HP, 50 Hz, eight-pole, 0.85 Leading PF, Y-connected synchronous motor is having
a negligible armature resistance, and a synchronous reactance of 15 2.
This motor is operating at EA = 1841 Volts, and 8 = -25°.
If the flux is increased by 10 % while the power is kept constant,
find the new armature current and the new power factor of the motor.
Answers:
Magnitude of IA =
PF =
KW.
Amp.
EN
Transcribed Image Text:The shaft of a three-phase synchronous generator is rotating at 3000 RPM synchronous speed. This generator is supplying a load of 40 KW, 0.8 PF lagging, with an efficiency of 75 %. The copper losses are neglected. Calculate the sum PF&W + Pcore + Pstray Answer: The sum PF&W + Pcore + Pstray is: A 2300 V, 400 HP, 50 Hz, eight-pole, 0.85 Leading PF, Y-connected synchronous motor is having a negligible armature resistance, and a synchronous reactance of 15 2. This motor is operating at EA = 1841 Volts, and 8 = -25°. If the flux is increased by 10 % while the power is kept constant, find the new armature current and the new power factor of the motor. Answers: Magnitude of IA = PF = KW. Amp. EN
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