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II-A 480 V-50 Hz three-phase synchronous alternator, stator connected in star, number of poles P=3. The Synchronous reactance Xs = 1 22. The stator resistance is neglected. The number of wires of the stator winding is 250 wires. At full load the alternator delivers a nominal current of 60 A at cosq=0.8 (ind). At no-load the output voltage is 480 V with a constant excitation current. The mechanical losses are 1.5 KW and the magnetic losses 1KW. Find: 1-The magnetic field in the magnetic circuit of the machine 2-The speed of rotation of the alternator. 3- The output voltage, if the alternator delivers its nominal current in a three-phase inductive load of cosp=0.8. Draw the vector diagram. Deduce the angle A 4- What are the connection conditions of two generators in parallel? (10pts)
II-A 480 V-50 Hz three-phase synchronous alternator, stator connected in star, number of poles P=3. The Synchronous reactance Xs = 1 22. The stator resistance is neglected. The number of wires of the stator winding is 250 wires. At full load the alternator delivers a nominal current of 60 A at cosq=0.8 (ind). At no-load the output voltage is 480 V with a constant excitation current. The mechanical losses are 1.5 KW and the magnetic losses 1KW. Find: 1-The magnetic field in the magnetic circuit of the machine 2-The speed of rotation of the alternator. 3- The output voltage, if the alternator delivers its nominal current in a three-phase inductive load of cosp=0.8. Draw the vector diagram. Deduce the angle A 4- What are the connection conditions of two generators in parallel? (10pts)