Q.1 A 1000 kW, 3-phase, star-connected, 3.3 kV, 24-pole, 50 Hz synchronous motor has a synchronous reactance of 3.24 W per phase; the resistance being negligible (a) The motor is fed from infinite bus-bars at 3.3 kV. Its field excitation is adjusted to result in unity pf operation at rated load. Compute the maximum power and torque that the motor can deliver with its excitation remaining constant at this value.
Q.1 A 1000 kW, 3-phase, star-connected, 3.3 kV, 24-pole, 50 Hz synchronous motor has a synchronous reactance of 3.24 W per phase; the resistance being negligible (a) The motor is fed from infinite bus-bars at 3.3 kV. Its field excitation is adjusted to result in unity pf operation at rated load. Compute the maximum power and torque that the motor can deliver with its excitation remaining constant at this value.
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Transcribed Image Text:Q.1 A 1000 kW, 3-phase, star-connected, 3.3 kV, 24-pole, 50 Hz synchronous motor has a
synchronous reactance of 3.24 W per phase; the resistance being negligible
(a) The motor is fed from infinite bus-bars at 3.3 kV. Its field excitation is adjusted to
result in unity pf operation at rated load. Compute the maximum power and torque that
the motor can deliver with its excitation remaining constant at this value.
(b) The motor is now fed from a 1200 kVA, 3-phase star-connected, 3.3 kV, 2-pole, 50 Hz
synchronous generator with a synchronous reactance of 4.55 W per phase, the resistance
being negligible. Compute the field excitations of motor and generator when the set is
operating at rated terminal voltage at unity pf and the motor is delivering full-load power.
The field excitations of both the machines remaining constant, the motor load is gradually
raised. Compute the maximum power and torque that the motor can deliver. Also
compute the terminal voltage when the motor is delivering maximum power.
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