3 phase, 37.3 Kw, 440 V, 50 Hz induction motor operates at full load with efficiency...
3 phase, 37.3 Kw, 440 V, 50 Hz induction motor operates at full load with efficiency 89% and power factor 0.85 lagging. Calculate:
A) The total KVA rating of capacitor required to rise full load power factor to 0.95 lagging.
B) What is capacitance per phase if capacitor:
1) Delta connected.
2) Star connected.
Homework Answers
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3 phase, 37.3 Kw, 440 V, 50 Hz induction motor operates at full
load with efficiency...
QUESTION 3 3.1 A single-phase 39 kW, 380 V, 50Hz induction motor operates on full load...
QUESTION 3 3.1 A single-phase 39 kW, 380 V, 50Hz induction motor operates on full load with an efficiency of 89% and at a power factor of 0.809 lagging. Three identical parallel- connected capacitors are used to raise the power factor to 0.96. 3.1.1 Calculate the kVAr rating of the capacitor bank. (9) 3.1.2 Calculate the capacitance of each capacitor. (6) [15]
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of...
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω Calculate the capacitance of delta-connected capacitors required to improve the overalil power factor to 0 95 lagging [14] TOTAL 1001
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system...
Question 11: (3 marks) A 6 pole, 60 Hz, star connected three-phase induction motor has a...
Question 11: (3 marks) A 6 pole, 60 Hz, star connected three-phase induction motor has a rating of Pm = 55 kW and line voltage = 420 V. The slip of the motor is 2% at 0.9 power factor lagging. If the full load efficiency is 95%, calculate the torque developed in the motor.
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...
7. A 3-phase, 300 kW, 2300 V, 60 Hz, 1800 r/min induction motor is used to...
7. A 3-phase, 300 kW, 2300 V, 60 Hz, 1800 r/min induction motor is used to drive a compressor. The motor has a full- load efficiency and power factor of 93 percent and 87 percent, respectively. If the terminal voltage rises to 2750 V while the motor operates at full-load, determine the effect (increase or decrease) upon a. Mechanical power delivered by the motor b. Motor torque c. Rotational speed d. Full-load current e. Power factor and efficiency f. Starting...
A 1.6-hp, 8-pole, 60-Hz, three-phase induction motor is rated for 820 rpm, 220 V rms (line-to-line),...
A 1.6-hp, 8-pole, 60-Hz, three-phase induction motor is rated for 820 rpm, 220 V rms (line-to-line), and 4.32 A (line current) at 77.0 percent lagging power factor. Find the full-load efficiency if the motor is delta-connected and if it is wye-connected.
A two-pole, 75kW, 440 V, 50 Hz, Y-connected, three-phase squirrel cage induction motor has the fo...
Please solve this question. Thank you.
A two-pole, 75kW, 440 V, 50 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters, in Ω/phase referred to the stator: R1-0.075, XI 0.17, xm-72, R2-0.065 and X-0.17. Its rated slip is 4%. Assume that the mechanical losses are 1 kW and the core losses are 1.1 kW. Compute: a. The rated input current b. The rated power factor. c. The pullout torque d. The induced and load torques at rated conditions....
A three-phase induction motor delivers 500 hp at an efficiency of 0.91, the operating power factor...
A three-phase induction motor delivers 500 hp at an efficiency of 0.91, the operating power factor being 0.76 lagging. A loaded synchronous motor with a power consumption of 100 kW is connected in parallel with the induction motor. Calculate the necessary kVA and the operating power factor of the synchronous motor if the overall power factor is to be unity. Answer should be 365 kVA, 0.274
Q6 A 50 hp 440 V three phase induction motor is used to determine the power...
Q6 A 50 hp 440 V three phase induction motor is used to determine the power rating of a load. With the load connected to the motor shaft, the input power is 30.5 KW and the stator current is 34.5 A at rated voltage. The blocked rotor test on the motor yields a current of 44.3 A at 52.5 V and a power input of 2.1 kW. When running with no load at rated voltage, the motor takes 16.3 A...
The equivalent circuit of a 440 V, 3-phase, 8 pole, and 50 Hz star-connected induction motor (HELP)
Question: The equivalent circuit of a 440 V, 3-phase, 8 pole, and 50 Hz star-connected induction motor is shown in figure 1. The short-circuit test is conducted with a locked rotor and a line current of 80 A. The open-circuit test is conducted by supplying the stator winding at rated voltage and at the rotor is rotating freely without any mechanical load. Fig. 1 The per-phase equivalent circuit of a 3-phase induction motora) Determine the line voltage and power factor on the...
QUESTION 3 3.1 A single-phase 39 kW, 380 V, 50Hz induction motor operates on full load with an efficiency of 89% and at a power factor of 0.809 lagging. Three identical parallel- connected capacitors are used to raise the power factor to 0.96. 3.1.1 Calculate the kVAr rating of the capacitor bank. (9) 3.1.2 Calculate the capacitance of each capacitor. (6) [15]
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω Calculate the capacitance of delta-connected capacitors required to improve the overalil power factor to 0 95 lagging [14] TOTAL 1001
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system...
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...
Please solve this question. Thank you.
A two-pole, 75kW, 440 V, 50 Hz, Y-connected, three-phase squirrel cage induction motor has the following parameters, in Ω/phase referred to the stator: R1-0.075, XI 0.17, xm-72, R2-0.065 and X-0.17. Its rated slip is 4%. Assume that the mechanical losses are 1 kW and the core losses are 1.1 kW. Compute: a. The rated input current b. The rated power factor. c. The pullout torque d. The induced and load torques at rated conditions....
Q6 A 50 hp 440 V three phase induction motor is used to determine the power rating of a load. With the load connected to the motor shaft, the input power is 30.5 KW and the stator current is 34.5 A at rated voltage. The blocked rotor test on the motor yields a current of 44.3 A at 52.5 V and a power input of 2.1 kW. When running with no load at rated voltage, the motor takes 16.3 A...
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