Q1.A 480V, 50HZ,A-connected, 6-pole synchronous generator has a per-phase synchronous reactance of 2 Q Its full-load armature current is 60A at 0.8PF lagging. This generator has friction and windage losses of 1.5kW and core losses of 1 kW at 60HZ at full load. Since the armature resistance is being ignored, assume that the l'R losses are negligible. The field current has been adjusted so that the terminal voltage is 480V at no load. (a) What is the speed of rotation of this generator? (b) What is the terminal voltage of this generator if the following are true? 1. It is loaded with the rated current at 0.8 PF lagging. 2. It is loaded with the rated current at 1.0 PF. 3. It is loaded with the rated current at 0.8 PF leading.

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Q1.A 480V, 50HZ,A-connected, 6-pole synchronous
generator has a per-phase synchronous reactance
of 2 Q Its full-load armature current is 60A at 0.8PF
lagging. This generator has friction and windage
losses of 1.5kW and core losses of 1 kW at 60HZ at
full load. Since the armature resistance is being
ignored, assume that the I'R losses are negligible.
The field current has been adjusted so that the
terminal voltage is 480V at no load.
(a) What is the speed of rotation of this generator?
(b) What is the terminal voltage of this generator if
the following are true?
1. It is loaded with the rated current at 0.8 PF
lagging.
2. It is loaded with the rated current at 1.0 PF.
3. It is loaded with the rated current at 0.8 PF
leading.
(c) What is the efficieny of this generator (ignoring
the unknown electrical losses) when it is operating
at the rated current and 0.8 PF lagging? (d) How
much shaft torque must applied by the prime mover
at full load? How large is the induced
countertorque?
(e) What is the voltage regulation of this generator
at 0.8 PF lagging? At 1.0 PF? At 0.8 PF leading?
Transcribed Image Text:Q1.A 480V, 50HZ,A-connected, 6-pole synchronous generator has a per-phase synchronous reactance of 2 Q Its full-load armature current is 60A at 0.8PF lagging. This generator has friction and windage losses of 1.5kW and core losses of 1 kW at 60HZ at full load. Since the armature resistance is being ignored, assume that the I'R losses are negligible. The field current has been adjusted so that the terminal voltage is 480V at no load. (a) What is the speed of rotation of this generator? (b) What is the terminal voltage of this generator if the following are true? 1. It is loaded with the rated current at 0.8 PF lagging. 2. It is loaded with the rated current at 1.0 PF. 3. It is loaded with the rated current at 0.8 PF leading. (c) What is the efficieny of this generator (ignoring the unknown electrical losses) when it is operating at the rated current and 0.8 PF lagging? (d) How much shaft torque must applied by the prime mover at full load? How large is the induced countertorque? (e) What is the voltage regulation of this generator at 0.8 PF lagging? At 1.0 PF? At 0.8 PF leading?
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