6.9 A3 ϕ, 11 kV, 60 Hz, 25 MVA, Y-connectedcylindrical-rotor synchronous machine generator hasRa = 0.45 Ω per phase andXs = 4.5 Ω per phase. The generator deliversthe rated load at 11 kV and 0.85 lagging power factor. Determinethe excitation voltage, Ef, for this operatingcondition.
6.11 The synchronous machine in Problem 6.9 isoperated as a synchronous motor and it is drawing rated MVA at 0.85lagging power factor. Determine the excitation voltage,Ef, for this operating condition.
