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b) A 1MW, 3300 V, 50 Hz, wye-connected, 3-ф, twenty four-pole, synchronous motor has a synchronous reactance of 3.24 2 per phase. Assume armature resistance is negligible. This machine is connected to an infinite bus-bars at 3300 V. Its field excitation is adjusted to provide P.F-1 at rated load Calculate: 0 the internal generated voltage EA and armature current la at rated conditions (S marks) ii) the maximum power and torqu e that the motor can deliver with its Ir remaining constant
iii) The power supply to the motor (from infinite bus) is removed and connected a 1.2 MVA, 3300V, 34, wye-connected, two-pole, 50 Hz synchronous generator with a synchronous reactance of 4.55 Ω per phase. Assume the generator armature resistance is zero. Calculate the internal generated voltage of the generator and the motor when the generator motor set is operating at rated terminal voltage with P.F 1 and the motor is providing full-load power.
iii) The power supply to the motor (from infinite bus) is removed and connected a 1.2 MVA, 3300V, 3-<p, wye-connected, two-pole, 50 Hz synchronous generator with a synchronous reactance of 4.55 Ω per phase. Assume the generator armature resistance is zero. Calculate the internal generated voltage of the generator and the motor when the generator motor set is operating at rated terminal voltage with P.F-1 and the motor is providing full-load power. (8 marks) iv) draw the phasor diagram for the loading condition stated in part (i) and indicates the magnitudes of various vectors and their angles. (4 marks)
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