A 3 phase 10 kVA, 400 V star connected, 4 pole synchronous generator has a synchronous reactance per phase of 2 Ohms. The armature resistance is neglected. Define: a) the rotational speed of the generator to produce an output frequency of 60 Hz b) generator voltage regulation at full load and a load factor of 0.8 lagging.

A three-phase, Y-connected, 220-V synchronous generator has an armature resistance of 0.22 Q/phase and a synchronous reactance of 5.2 Q/phase. At the rated voltage, the generator delivers 9.7-kVA to a load at a power factor of 0.83 lagging. A. Determine the excitation voltage, EA. B. Determine the efficiency of the generator if the friction and windage losses are 0.29 KW and the core losses are 0.45 KW. Ignore stray losses. Insert the efficiency below (numbers only):

Subject:machines topic: synchronous machines

' A three phase, star connected, round rotor synchronous generator is rated 250 MW, 0.85 lagging power factor, 10.8 kV 50 Hz, and 1600 rpm. Each winding has an armature resistance of 1.5 mOHM and a synchronous reactance of 0.5 OHM 1)Determine the induced voltage for the condition of rated load and 0.85 power factor lagging. 2) Draw the phasor diagram with calculated values. 3) Determine the values of theta, gamma, delta, and torque angle