Question

Problem 1: Synchronous Machine Generator and Motor Operation A 10 MVA, 2300 Volt (Line to line xms) uniform airgap synchronous machine has a synchronous reactance of 0.9 pu at 60 Hz and resistance may be neglected. The machine is connected to a 2300 Volt constant voltage, constant frequency source and operated as described below (a) Generator Operation - Find the power, reactive power, current, and the required internal voltage E for generator operation at rated volt-amperes and power factors of unity, 0.707 lagging, and zero lagging in per unit. For the current, Ia, and internal voltage, EA, provide botlh the magnitude and the phase angle Draw three phasor diagrams (to scale in per unit) showing the three operating points. The diagram should include the terminal voltage, the internal voltage, the reactance drop, the current, the field flux linkage/flux density, the armature reactance flux/flux density, and the resulting airgap/net flux linkage/flux density. The flux linkage of the rotor created field has the same per unit magnitude as the internal voltage when expressed in per unit. PF 1.0 [pul [pul [pul [pul IA PF = 0.707 Lagging