![b) the r.m.s.value of the supply current c) the r.m.s.value of the current, and d) the resultant power factor of the circuit 17 ELE2601/101/3/2018 4.2 A balanced three-phase load is connected to a three- phase, 380-V supply. The load takes 7,5 kW at a power factor of 0,8 lagging. Calculate the resistance and reactance of each phase if the load is star-connected. 4.3 A three-phase cable supplies power to a balanced three- phase load. Each conductor carries a current of 120 A per phase and each conductor has a resistance of 0.4 ? per phase. The power factor of the load is improved so that the line current is reduced to 90 A. Calculate the percentage change in power loss in the cable. 44 Refer to figure 4. The phasor diagram and connection diagram is applicable on a three-phase system. Calculate the reading on the wattmeter 15 A VAR 24 A VL-440Vv 30 A VCA c Figure 4 121] QUESTION 5 5.1 What is a summetrical th ree-phase supply? 5.2 Define the term power factor 5.3 Explain why a load will have a lagging power factor 5.4 Mention five detrimental effects of harmonics in electrical TOTAL: [109] 18](http://img.homeworklib.com/questions/b9e273a0-b738-11eb-9e97-617feb4b7e5b.png?x-oss-process=image/resize,w_560)
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b) the r.m.s.value of the supply current c) the r.m.s.value of the current, and d) the...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
A building takes a three-phase supply at 400 V with a declared prospective short circuit current of 30 kA at the intake switchboard. The cable installed between the intake switchboard and a remot...
A building takes a three-phase supply at 400 V with a declared prospective short circuit current of 30 kA at the intake switchboard. The cable installed between the intake switchboard and a remote distribution board has a circuit length of 100 m. The cable is PVC-insulated and has the following characteristics at 20 °C: 12.4 Phase conductor resistance 0.095 ma/m Phase conductor reactance 0.075 mO/m Conductor temperature coefficient of resistance 0.004 per c Connected to the remote distribution board is...
a) define complex power in terms of the supply current i and v b) draw separately...
a) define complex power in terms of the supply current i and v b) draw separately the current and power phasor relations for the case of a load consisting of a series connection of a resistor and an inductor across the voltage supply c) A single phase load connected to a 230V, 50Hz source draws is rated 1.84kVA at a phase angle of 40,lagging, determine the current drawn from the supply and load power factor, calculate the active and reactive...
A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms....
A balanced positive-sequence wye-connected 60-Hz three-phase source has line-to-line voltages of VL = 440 V rms. This source is connected to a balanced wye-connected load. Each phase of the load consists of a 0.5-H inductance in series with a 50-Ω resistance. Assume that the phase of Van is zero. home / study / engineering / electrical engineering / electrical engineering questions and answers / A Balanced Positive-sequence Wye-connected 60-Hz Three-phase Source Has Line-to-line Voltages ... Question: A balanced positive-sequence wye-connected...
please take note the question is extend a) A single phase 240V 50Hz supply is supplying...
please take note the question is extend
a) A single phase 240V 50Hz supply is supplying a power to a load which consist of 500 resistance and 0.3H inductance through a cable which has an effective impedance of 1+j2 0. The equivalent circuit of the single-phase system is shown in Figure Q1(a). Zcable=1+j2 I Load 5092 240V 50Hz Supply V Load 0.3H Figure Q1(a): A single phase system. i. ii. Determine the load current, low and the load voltage Vood...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current,...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current, excitation voltage and load angle. [10] (ii) What is the maximum theoretical power at this excitation? Draw a phasor diagram (to scale) and from this estimate the phase current and power factor when operating at this point. 151
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator...
A three-phase delta-connected synchronous induction motor is connected to a 415 volt, 50 Hz supply. The...
A three-phase delta-connected synchronous induction motor is connected to a 415 volt, 50 Hz supply. The winding resistance is negligible and the synchronous reactance per phase is 5 ohms. The input power is 20 kW and the motor has a leading power factor of 0.8. Draw the phasor diagram for this machine: ii) use the IXs phasor and the V phasor to construct the phasor for E. iii) measure or calculate the magnitude of E iv) By construction and/or by...
QUESTION 3 31A cable is required to supply a welding set taking a current of 225 A at 110 V alter...
QUESTION 3 31A cable is required to supply a welding set taking a current of 225 A at 110 V alternating current, the average power factor being 0 5 lagging An available cable has a rating of 175 A and it is decided to use this cable by installing a capacitor across the terminals of the welding set Fınd 311 the required capacitor current and reactive power to limit the cable current to 175 A the overall power factor with...
Experiment # 8-Prelab Measurement of Single Phase AC Power by Wattmeter 8.1.The measured current in Figure...
Experiment # 8-Prelab Measurement of Single Phase AC Power by Wattmeter 8.1.The measured current in Figure 8.3 is 10 A and the measured power is 900 W. Consider that the wattmeter is ideal (doesn't change the voltage and current through the load) and determine: a) The resistance of the motor coil (R); b) The inductance of the motor coil (L); c) The power factor of the motor coil (cosp) d) The complex power (S); e) The reactive power (Q): f...
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...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
A building takes a three-phase supply at 400 V with a declared prospective short circuit current of 30 kA at the intake switchboard. The cable installed between the intake switchboard and a remote distribution board has a circuit length of 100 m. The cable is PVC-insulated and has the following characteristics at 20 °C: 12.4 Phase conductor resistance 0.095 ma/m Phase conductor reactance 0.075 mO/m Conductor temperature coefficient of resistance 0.004 per c Connected to the remote distribution board is...
please take note the question is extend
a) A single phase 240V 50Hz supply is supplying a power to a load which consist of 500 resistance and 0.3H inductance through a cable which has an effective impedance of 1+j2 0. The equivalent circuit of the single-phase system is shown in Figure Q1(a). Zcable=1+j2 I Load 5092 240V 50Hz Supply V Load 0.3H Figure Q1(a): A single phase system. i. ii. Determine the load current, low and the load voltage Vood...
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator operating at 7MW and a 0.88 lagging power factor is connected to the Grid. The synchronous reactance is 1.5Ω (i) Calculate the phase current, excitation voltage and load angle. [10] (ii) What is the maximum theoretical power at this excitation? Draw a phasor diagram (to scale) and from this estimate the phase current and power factor when operating at this point. 151
Q2 (a) A star connected 6.6kV, 8MVA synchronous generator...
QUESTION 3 31A cable is required to supply a welding set taking a current of 225 A at 110 V alternating current, the average power factor being 0 5 lagging An available cable has a rating of 175 A and it is decided to use this cable by installing a capacitor across the terminals of the welding set Fınd 311 the required capacitor current and reactive power to limit the cable current to 175 A the overall power factor with...
Experiment # 8-Prelab Measurement of Single Phase AC Power by Wattmeter 8.1.The measured current in Figure 8.3 is 10 A and the measured power is 900 W. Consider that the wattmeter is ideal (doesn't change the voltage and current through the load) and determine: a) The resistance of the motor coil (R); b) The inductance of the motor coil (L); c) The power factor of the motor coil (cosp) d) The complex power (S); e) The reactive power (Q): f...
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...
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