Three-Phase GeneratorRegulation

Problem:For the 220 volt three-phase generator, having a Zsynch = 0.135+j1.22 Ohms

Determine the voltage regulation for a rated current of 82 amps and 0.8 lagging

power factor

Calculations

= Cos-1(0.8) = -36.8 o

VOC = I / (Zsynch) + 127

VOC = 82 / -36.8 o (0.135 + j1.22) + 127

VOC =208 volts

Final Calculations

• VNL = 208.8)(√3) = 361 volts

• VFL = 220 volts

• Reg = (VNL-VFL)/VFL = 64 %