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1: PO2C Q39 A 300-KVA, 440-V, 50-Hz, 3-phase synchronous generator is Y-connected with Ra = 0.22...
Question 1 (Synchronous Generator Voltage Regulation Calculations) The synchronous impedance of a 13.2 kVA, 440 V,...
Question 1 (Synchronous Generator Voltage Regulation Calculations) The synchronous impedance of a 13.2 kVA, 440 V, A-connected, three-phase, synchronous generator s itj 10 Ω/phase. Calculate the voltage regulation when the generator supplies the full load at a power factor of (a) 0.866 lagging, (b) unity, and (c) 0.866 leading. 10 Mark:s
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.5Q/phase and a...
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor (HELP)
1. A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase. For unity power factor :(i) Determine the mechanical torque neglecting all machine losses (ii) If this torque can be assumed constant, what would be the motor back emf and load angle for (a) 0.9 power factor lag and (b) 0.9 power factor lead? (iii) How will the maximum torque be affected in both cases?
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole, Y-connected synchronous generator has a...
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole,
Y-connected synchronous generator has a synchronous reactance of
XS=0.016 Ω and an armature resistance of RA=0.016 Ω. At rated
conditions the core losses are 7 kW. Friction losses and field
winding losses are 8 kW. Suppose the machine is connected to an
infinite bus (hence the terminal voltage is fixed) and it is
running at the rated conditions.
a) What is the rotor speed in rpm?
b) Calculate the...
A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase.
1. A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase. For unity power factor :(i) Determine the mechanical torque neglecting all machine losses (ii) If this torque can be assumed constant, what would be the motor back emf and load angle for (a) 0.9 power factor lag and (b) 0.9 power factor lead? (iii) How will the maximum torque be...
3. A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole, Y-connected synchronous generator has...
3. A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole, Y-connected synchronous generator has a synchronous reactance of Xs=0.0162 and an armature resistance of RA=0.0.1622. At rated conditions the core losses are 7 kW. Friction losses and field winding losses are 8 kW. Suppose the machine is connected to an infinite bus (hence the terminal voltage is fixed) and it is running at the rated conditions. a) What is the rotor speed in rpm? b) Calculate the phase...
5. [Synchronous Generator - 15 points) A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated...
5. [Synchronous Generator - 15 points) A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: a. Voc at rated Ip was measured to be 500 V b. ll.sc at the rated Ip was found to be 250 A. c. When a de voltage of 20 V was applied to two of the terminals, a current of 45 A was measured. Draw per phase equivalent circuit of...
5. [Synchronous Generator - 15 points] A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated...
5. [Synchronous Generator - 15 points] A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: a. Vocat rated I was measured to be 500 V b. IL,se at the rated IF was found to be 250 A. c. When a de voltage of 20 V was applied to two of the terminals, a current of 45 A was measured. Draw per phase equivalent circuit of the...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
A 200 - kVA, 480 V, 50 Hz, Y connected synchronous generator with a rated field...
A 200 - kVA, 480 V, 50 Hz, Y connected synchronous
generator with a rated field current of 5 A was tested. The
following data were taken
VT,oc at rated IF was measured to be 500 V
IL,sc at the rated IF was found to be 250 A
When a rated DC voltage of 20 V was applied to 2 of
the terminals, a current of 45 A was measured.
Draw the per phase equivalent circuit of the generator
at...
Question 1 (Synchronous Generator Voltage Regulation Calculations) The synchronous impedance of a 13.2 kVA, 440 V, A-connected, three-phase, synchronous generator s itj 10 Ω/phase. Calculate the voltage regulation when the generator supplies the full load at a power factor of (a) 0.866 lagging, (b) unity, and (c) 0.866 leading. 10 Mark:s
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected
synchronous generator has a resistance 0.5Q/phase and a synchronous
reactance of 5Q/phase. The generator is supplying its rated power
at its rated voltage and at a power factor lagging. The rotational
loss is 2 kW. Calculate:
(a) the power developed,
(b) the power angle,
(c) the voltage regulation, and
(d) the shaft torque.
A 1500-kVA, 6.6 kV, 50 Hz, 6-pole, three-phase, star-connected synchronous generator has a resistance 0.50/phase and a synchronous...
A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole,
Y-connected synchronous generator has a synchronous reactance of
XS=0.016 Ω and an armature resistance of RA=0.016 Ω. At rated
conditions the core losses are 7 kW. Friction losses and field
winding losses are 8 kW. Suppose the machine is connected to an
infinite bus (hence the terminal voltage is fixed) and it is
running at the rated conditions.
a) What is the rotor speed in rpm?
b) Calculate the...
3. A 480 V, 60 Hz, 470 kVA, 0.85 PF lagging, 2-pole, Y-connected synchronous generator has a synchronous reactance of Xs=0.0162 and an armature resistance of RA=0.0.1622. At rated conditions the core losses are 7 kW. Friction losses and field winding losses are 8 kW. Suppose the machine is connected to an infinite bus (hence the terminal voltage is fixed) and it is running at the rated conditions. a) What is the rotor speed in rpm? b) Calculate the phase...
5. [Synchronous Generator - 15 points) A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: a. Voc at rated Ip was measured to be 500 V b. ll.sc at the rated Ip was found to be 250 A. c. When a de voltage of 20 V was applied to two of the terminals, a current of 45 A was measured. Draw per phase equivalent circuit of...
5. [Synchronous Generator - 15 points] A 200-kVA, 480-V 50-Hz, Y-connected synchronous generator with a rated field current of 5 A was tested, and the following data were taken: a. Vocat rated I was measured to be 500 V b. IL,se at the rated IF was found to be 250 A. c. When a de voltage of 20 V was applied to two of the terminals, a current of 45 A was measured. Draw per phase equivalent circuit of the...
Question 4 (10 marks) A) A 10-kVA, 415-V, three phase, Y -connected synchronous generator has a winding resistance of 0.3 Q and a synchronous reactance of 0.6 on a per phase basis. Determine its voltage regulation at full load when the power factor is (a) 75% lagging and (b) 75% leading. B) (10 marks) A 220-V, Y-connected, three-phase, synchronous motor has a synchronous reactance of 4 O/phase and negligible armature winding resistance. At a certain load the motor takes 7.5...
A 200 - kVA, 480 V, 50 Hz, Y connected synchronous
generator with a rated field current of 5 A was tested. The
following data were taken
VT,oc at rated IF was measured to be 500 V
IL,sc at the rated IF was found to be 250 A
When a rated DC voltage of 20 V was applied to 2 of
the terminals, a current of 45 A was measured.
Draw the per phase equivalent circuit of the generator
at...
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