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Engineering · Electrical Engineering
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2. (a) A 13.8 kV, 60 MVA, 50 Hz, three-phase, 2-pole, star connected[10 marks] synchronous generator has a synchronous reactance (X) of 2.6 Ω/phase It is connected to constant voltage, constant frequency busbars and supplies half-load current at a power factor of 0.8 lagging (0) Sketch a phasor diagram showing all relevant voltages and currents for this machine, and draw an equivalent circuit model of the synchronous generator. (i) For these conditions, determine the machine excitation voltage per phase (E) and the load angle (δ). (iii) If the generator excitation is increased by 20% of its value calculated in part (ii), determine the new load angle (δ) at which the machine operates, assuming the real power (P) is unchanged (b) A balanced three-phase overhead line is represented by constants [10 marks A0.95410 and B 110265 2. The receiving end and sending end phase voltages are maintained at 325 kV and 385 kV respectively and deliver a three-phase load of 1500 MW at 0.9 power factor leading (i) Draw to scale a line chart to represent this condition. (ii) Given that the real power is now reduced to 750 MW and that the terminal voltages remain unchanged, determine the reactive power now received at the receiving end of the line (ii) If the total power (VA) at the receiving end were to be reduced to zero and the receiving end voltage were maintained at 325 kV, what would the sending end voltage need to be?

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