A 500KVA, 6 pole, 500v, 3 phase, wye-connected synchronous generator has a synchronous impedance of 0.1 + j1.5 ohms per phase. If the generator is driven at 1000 r.p.m., what is the frequency of the generated voltage? Determine the excitation voltage and the power angle on full load and 0.8 lagging power factor.