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Name: 23. A 3-phase, 5000 hp, 6000 v,60 Hz, 12-pole wound-rotor induction motor has the 1, resistance between stator terminals-o12 Ω 2. resistance between rotor slip-rings-0.0073 Ω 3. windage and...
Name: 23. A 3-phase, 5000 hp, 6000 v,60 Hz, 12-pole wound-rotor induction motor has the 1, resistance between stator terminals-o12 Ω 2. resistance between rotor slip-rings-0.0073 Ω 3. windage and friction losses-51 kW following characteristics 4. iron losses in the stator-39 kW 5. locked rotor current at 6000 V-1800 A 6. active power to the stator with rotor locked 2207 kw Calculate under full-load voltage locked-rotor conditions a. Reactive power absorbed by the motor b. FR losses in the stator...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r,...
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r, 0.55 Ω Rotor resistance referred to a stator winding phase: r:-0.51 Ω Stator leakage inductance, L,-4.4 mH Rotor leakage inductance referred to a stator winding phase,1'-4.4 mH Magnetising inductance L-65 mH How many pole pairs has the motor? 12] a. Calculate the nominal power factor of the...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At st...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At start-up, the motor develops 1.9 times the full load developed torque but draws 7.5 times the rated current at the rated voltage. This motor is to be started with an auto- transformer reduced-voltage starter. Assume the stator resistance and the stator core loss to be negligible. Calculate...
Example 20-4. A 200 hp (150 kW), 460 V, 3-phase, 3520 r/min, 60 Hz induction motor has a locked-rotor torque of 600 Nom and a locked-rotor current of 1400 A (same motor as in Example 20- 2). Two auto...
Example 20-4. A 200 hp (150 kW), 460 V, 3-phase, 3520 r/min, 60 Hz induction motor has a locked-rotor torque of 600 Nom and a locked-rotor current of 1400 A (same motor as in Example 20- 2). Two autotransformers, connected in open delta, and having a 65 percent tap, are employed to provide reduced-voltage starting. Calculate a. The apparent power absorbed by the motor b. The apparent power supplied by the 460 V line c. The current supplied by the...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
A 120-V (line-neutral) wye-connected 4-pole 60-Hz three-phase induction motor is operating at 100% of its 10-kW...
A 120-V (line-neutral) wye-connected 4-pole 60-Hz three-phase induction motor is operating at 100% of its 10-kW rated output shaft power at 5% slip. What is the frequency of the rotor electrical currents in Hz?
4. A 50-kW, 460-V, 50-Hz, two-pole induction motor has a slip of 5 percent when operating...
4. A 50-kW, 460-V, 50-Hz, two-pole induction motor has a slip of 5 percent when operating a full-load conditions. At full-load conditions, the friction and windage losses are 700 W, and the core losses are 600 W. Find the following values for full-load conditions: (10 pts.) (a) The shaft speed in rpm (b) The output power in horse power (c) The load torque in lb-ft (d) The induced torque in lb-ft (e) The rotor frequency in hertz
Can you please answer both (d) and Question - 5. (d) The equivalent circuit parameters of...
Can you please answer both (d) and Question - 5.
(d) The equivalent circuit parameters of the motor in (a), at 50Hz, are: R; = 1.50; X;= X, = 40; R = 20; and Xx = 1000 If the motor is to develop its maximum torque at standstill, calculate the output frequency and voltage (RMS) from the inverter, if the air-gap flux remains constant. [6 marks) Question 5 A 4-pole 3-phase, 50 Hz, Y-connected, non-salient pole synchronous motor has the...
Name: 23. A 3-phase, 5000 hp, 6000 v,60 Hz, 12-pole wound-rotor induction motor has the 1, resistance between stator terminals-o12 Ω 2. resistance between rotor slip-rings-0.0073 Ω 3. windage and friction losses-51 kW following characteristics 4. iron losses in the stator-39 kW 5. locked rotor current at 6000 V-1800 A 6. active power to the stator with rotor locked 2207 kw Calculate under full-load voltage locked-rotor conditions a. Reactive power absorbed by the motor b. FR losses in the stator...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
4. A three-phase induction motor has the following data: Nominal power, P 7.5 kW Nominal voltage, = 400 V Connection: Y Nominal frequency, f-50 Hz Nominal speed, nn 960 rpm Stator resistance, r, 0.55 Ω Rotor resistance referred to a stator winding phase: r:-0.51 Ω Stator leakage inductance, L,-4.4 mH Rotor leakage inductance referred to a stator winding phase,1'-4.4 mH Magnetising inductance L-65 mH How many pole pairs has the motor? 12] a. Calculate the nominal power factor of the...
Question 2 (10 marks) (a) A large 3-phase, 4000 V, 60 Hz, slip of 0.01, squirrel cage induction motor draws a current of 375 A and a total active power of 2300 kW when operating at full-load. The stator is connected in wye and the resistance per phase is 0.05 12. The total iron losses are 23 kW and the windage and friction losses are 10 kW. Calculate the following: i) The power factor at full-load ii) The active power...
4.6. A 460-V, 75 kW, 4-pole, delta-connected, 60-Hz, three- phase induction motor has a full-load slip of 5 percent, an efficiency of 92 percent and a power-factor of 0.87 lagging at full-load. At start-up, the motor develops 1.9 times the full load developed torque but draws 7.5 times the rated current at the rated voltage. This motor is to be started with an auto- transformer reduced-voltage starter. Assume the stator resistance and the stator core loss to be negligible. Calculate...
Example 20-4. A 200 hp (150 kW), 460 V, 3-phase, 3520 r/min, 60 Hz induction motor has a locked-rotor torque of 600 Nom and a locked-rotor current of 1400 A (same motor as in Example 20- 2). Two autotransformers, connected in open delta, and having a 65 percent tap, are employed to provide reduced-voltage starting. Calculate a. The apparent power absorbed by the motor b. The apparent power supplied by the 460 V line c. The current supplied by the...
5. A 208-V four-pole 60-Hz Y-connected wound-rotor induction motor is rated at 30 hp. Its equivalent circuit components are R=0.100 Ry=0.070. X - 10.00 R = 250 X; -0.2100 X=0.21002 Praw=500 W P =0.5% of input at full load For a slip of 0.05, find (a) The line current (b) The induced voltage in the rotor (c) The stator power factor (d) The rotor power factor (e) The rotor frequency (f) The stator copper losses (g) The core loss (h)...
4. A 50-kW, 460-V, 50-Hz, two-pole induction motor has a slip of 5 percent when operating a full-load conditions. At full-load conditions, the friction and windage losses are 700 W, and the core losses are 600 W. Find the following values for full-load conditions: (10 pts.) (a) The shaft speed in rpm (b) The output power in horse power (c) The load torque in lb-ft (d) The induced torque in lb-ft (e) The rotor frequency in hertz
Can you please answer both (d) and Question - 5.
(d) The equivalent circuit parameters of the motor in (a), at 50Hz, are: R; = 1.50; X;= X, = 40; R = 20; and Xx = 1000 If the motor is to develop its maximum torque at standstill, calculate the output frequency and voltage (RMS) from the inverter, if the air-gap flux remains constant. [6 marks) Question 5 A 4-pole 3-phase, 50 Hz, Y-connected, non-salient pole synchronous motor has the...
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