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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...
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.
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and...
A 400 v, 50 Hz, three phase alternator, rated at 75 kVA, is star connected and driven at 1000 r/min. The windings of the alternator have a resistance, per phase, of 0.03 Ω and synchronous reactance, at 50 Hz per phase, of j0.325 Ω. The stator of the alternator has 108 slots, with 8 conductors, per slots, in a double layer. The maximum pole flux is 8.772 x 10-3 Wb. To improve the wave form only 80% of the pole...
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...
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.
Two electrical loads are connected in parallel to a 380 V, 50 Hz, three phase supply....
Two electrical loads are connected in parallel to a 380 V, 50 Hz, three phase supply. The first load consists of three identical impedance each 7 Ω resistance and 5Ω inductive resistance, connected in star. The second load consists of three identical impedances, each 12 Ω resistance and 8 Ω capacitive reactance connected in delta. Sketch the arrangement described above Calculate Zph1 and Zph2[Zph1= 8.6Ω 35.54°; Zph2= 14.42 Ω -33.69°] Determine Iph1 and Iph2[Iph1= 25.51A -35.54°; Iph2= 26.35A +33.69°] IL1...
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...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at 0.95 pf lagging through a short transmission line with negligible resistance and a series inductive reactance of 13 12. The load is operated at 25 kV. Compute: (a) the line current magnitude (b) the line voltage magnitude at the source (c) the line-to-neutral source voltage (d) the power factor of the source
A three-phase positive sequence Y-connected source supplies 14 kVA with a power factor of 0.75 lagging...
A three-phase positive sequence Y-connected source supplies 14 kVA with a power factor of 0.75 lagging to a parallel combination of a Y-connected load and a A-connected load. The Y-connected load uses 9 kVA at a power factor of 0.6 lagging and has an a-phase current of 102-30° A. a) Find the complex power per phase of the A-connected load. b) Find the magnitude of the line voltage.
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of eq...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
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 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...
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...
A 60 Hz, balanced three-phase source is connected to a balanced load of 2815 kVA at 0.95 pf lagging through a short transmission line with negligible resistance and a series inductive reactance of 13 12. The load is operated at 25 kV. Compute: (a) the line current magnitude (b) the line voltage magnitude at the source (c) the line-to-neutral source voltage (d) the power factor of the source
A three-phase positive sequence Y-connected source supplies 14 kVA with a power factor of 0.75 lagging to a parallel combination of a Y-connected load and a A-connected load. The Y-connected load uses 9 kVA at a power factor of 0.6 lagging and has an a-phase current of 102-30° A. a) Find the complex power per phase of the A-connected load. b) Find the magnitude of the line voltage.
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
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