A 50 Hz three-phase Y-connected 4 pole synchronous generator is rated at 15 kVA, 400 V (line-to-line). The synchronous reactance Xs per phase is 20. The no-load (open circuit, line-to line) teminal...

Extracted text: A 50 Hz three-phase Y-connected 4 pole synchronous generator is rated at 15 kVA, 400 V (line-to-line). The synchronous reactance Xs per phase is 20. The no-load (open circuit, line-to line) teminal voltage follows the magnetisation curve shown in Figure Q2a below. 500 E 450 400 350 300 250 200 150 100 50 0.5 1 1.5 2.5 Field current (A) Figure Q2a: Magnetisation curve for rotor of a synchronous generator. (i) Determine the rated speed. (ii) What is the field current required at full-load operation at 0.8 lagging pf. (iii) Draw the phasor diagram for the mode of operation described in (ii) above. (iv) If the field current is set to 1.5 A, calculate the total active power that is delivered by the machine when it is operating as a generator connected to a 400 V (line-to- line) infinite bus and making a torque angle of 5°. Open-circuit terminal voltage (V)