In a factory. the following are the loads: Induction motors: 90 hp. 0.7 power factor. 0.82 efficiency Lighting and heating: 10 kW Synchronous motor: 20 kVA unity power factor a) Determine the overal power factor of the factory loads b) To improve the the factory power factor. the synchronous motor is overexcited without any change in its load. Determine the VAr that must be injected by the synchronous motor to raise the overall power factor of the factory to 0.9. 1 hp =746 W
In a factory. the following are the loads: Induction motors: 90 hp. 0.7 power factor. 0.82 efficiency Lighting and heating: 10 kW Synchronous motor: 20 kVA unity power factor a) Determine the overal power factor of the factory loads b) To improve the the factory power factor. the synchronous motor is overexcited without any change in its load. Determine the VAr that must be injected by the synchronous motor to raise the overall power factor of the factory to 0.9. 1 hp =746 W
Chapter39: Synchronous Motor Operation
Section: Chapter Questions
Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...
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Transcribed Image Text:In a factory, the following are the loads:
Induction motors: 90 hp. 0.7 power factor. 0.82 efficiency
Lighting and heating: 10 kW
Synchronous motor: 20 kVA unity power factor
a) Determine the overal power factor of the factory loads
b) To improve the the factory power factor. the synchronous motor is overexcited without any change in its load. Determine the VAr
that must be injected by the synchronous motor to raise the overall power factor of the factory to 0.9.
1 hp =746 W
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