A 750 KW , 11 KV, 3 phase star connected synchronous motor has a synchronous reactance of 35 ohm per phase and negligible resistance. What is the excitation emf per phase when the motor is operating on full load at 0.8 pf leading.Its efficiency under this condition is 93%.
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A 1000 kVA, 6.6 kV
Explanation:
A 1000 kVA, 6.6 kV, 3-phase star-connected synchronous generator has a syn chronous reactance of 25 Ω per phase. It supplies full load current at 0.8 lagging pf and a rated terminal voltage. Compute the terminal voltage for the same excitation when the generator supplies full-load current at 0.8 leading pf.
2. A 750 kW, 11 kV, 3-phase, star-connected synchronous motor has a synchronous reactance of 35 W/phase and negligible resistance. Determine the excitation emf per phase when the motor is operating on full-load at 0.8 pf leading. Its efficiency under this condition is 93%.
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