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solution

Assume in Problem 11.59 that when the load drops to 180 kW and 480 magnetizing kVAR the capacitor bank at the substation is disconnected. Also assume that the line-to-line voltage at the substation is maintained at 13.8 kV.

 a) What is the magnitude of the line-to-line voltage at the generating plant?

 b) Is the voltage level found in (a) within the acceptable range of variation?

 c) What is the total line loss in kW when the capacitors stay on line after the load drops to 180 + j480 kVA?

 d) What is the total line loss in kW when the capacitors are removed after the load drops to 180 + j480 kVA?

 e) Based on your calculations, would you recommend disconnecting the capacitors after the load drops to 180 + j480 kVA? Explain.

Problem 11.59

Assume the load on the substation bus in the Practical Perspective example drops to 180 kW and 480 magnetizing kVAR. Also assume the capacitors remain connected to the substation.

 a) What is the magnitude of the line-to-line voltage at the generating plant that is required to maintain a line-to-line voltage of 13.8 kV at the substation?

 b) Will this power plant voltage level cause problems for other customers?

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