A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 Ω. Its full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the I2R losses) a. b. i. ii. iii. c. d. e. can be ignored. The field current has been adjusted such that the no-load terminal voltage is 480 V. What is the speed of rotation of this generator? What is the terminal voltage of the generator if : it is loaded with the rated current at 0.8 PF lagging; it is loaded with the rated current at 1.0 PF; it is loaded with the rated current at 0.8 PF leading. What is the efficiency of this generator (ignoring the unknown electrical losses) when it is operating at the rated current and 0.8 PF lagging? How much shaft torque must be applied by the prime mover at the full load? how large is the induced counter-torque? What is the voltage regulation of this generator at i. 0.8 PF lagging ii. at Unity PF iii. at 0.8 PF leading?
A 480 V, 50 Hz, Y-connected six-pole synchronous generator has a per-phase synchronous reactance of 1.0 Ω. Its full-load armature current is 60 A at 0.8 PF lagging. Its friction and windage losses are 1.5 kW and core losses are 1.0 kW at 60 Hz at full load. Assume that the armature resistance (and, therefore, the I2R
losses) a.
b. i.
ii. iii.
c. d. e.
can be ignored. The field current has been adjusted such that the no-load terminal voltage is 480 V. What is the speed of rotation of this generator?
What is the terminal voltage of the generator if :
it is loaded with the rated current at 0.8 PF lagging;
it is loaded with the rated current at 1.0 PF;
it is loaded with the rated current at 0.8 PF leading.
What is the efficiency of this generator (ignoring the unknown electrical losses) when it is operating at the rated current and 0.8 PF lagging?
How much shaft torque must be applied by the prime mover at the full load? how large is the induced counter-torque?
What is the voltage regulation of this generator at
i. 0.8 PF lagging ii. at Unity PF iii. at 0.8 PF leading?
Trending now
This is a popular solution!
Step by step
Solved in 7 steps with 8 images
