A three-wire 120/240-V system supplies a load of 2.4 kW at 120 V on phase A, 4.8 kW on phase B and 6.4 kW at 240 V. The power factor for each load is 1.0. Draw a diagram of the residential system. Find the currents in each of the three legs.
A three-wire 120/240-V system supplies a load of 2.4 kW at 120 V on phase A,...
10. Two loads connected in parallel draw a total of 2.4 kW at 0.8 pflagging from a 120-V rms, 60- Hz line. One load absorbs 1.5 kW at a 0.707 pf lagging. Determine: (a) the pf of the second load, INV 11. Calculate the line currents for the system shown in figure. Calculate also the total power and reactive power consumed by the load. w 12. For the balanced three-phase circuit in Fig.. Calculate the line currents, the phase voltage...
1. A renewable energy system delivers 120 kW of three-phase power at 400 V (line-line) to a load with a 0.9 lagging power factor. If each power line has a resistance of R = 0.03 Ω and reactance of X = 0.04 Ω, determine the sending end voltage (line-line) of the three-phase power line connected to the renewable energy system for supplying power to the load. 2. A network service operator found that the voltage rise in a network due...
If a 25-kW (rated) wind turbine has a three-phase, 480-V generator, what minimum size wire will be needed for each phase to connect the wind turbine to a load that is 50 m away? Remember, you need to count the length of wire down the 25-m tower. Peak power can be 30 kW. Calculate maximum current and reduce it by a factor of 1.7 because the system is three-phase. Each leg (wire) of the three-phase system carries 1/3 of the...
Two three-phase generators supply a three-phase load through separate three-phase lines. The load absorbs 30 kW at 0.8 power factor lagging. The line impedance is (1.4 +J1.6) Ω per phase between generator G1 and the load, and (0.8 +jl ) Ω per phase between generator G2 and the load. If generator Gl supplies 15 kW at 0.8 power factor lagging, with a terminal voltage of 460 V line- to-line, determine 1. The voltage at the load terminals. 2. The voltage...
A 220 kW load having 0.8 lagging power factor is supplied from a 600 V (line to line) three-phase supply. A bank of power factor capacitors is delta connected Q2. (a) Draw neat schematic diagram showing the connection of the capacitor bank in Delta connection. (b) Determine the kVAR rating of each individual capacitor needed to bring power factor to 0.9 (c) Determine the capacitance of each capacitor in μF.
A three-phase generator connected in a star generates a phase voltage of Vθ = 24 KVrms and supplies a three-phase transformer connected in star. The transformation ratio is 115: 1. Each of the three coils of the secondary transformer feed 3 equal charges each composed of them by R = 18Ω, XC = 2Ω and XL = 20Ω. a) Calculate the phase, line and charge currents after the b) Calculate the phase, line and load voltages c) Calculate the Apparent...
Problem #2 (60 pts). A balanced three-phase 240-V (rms, line-to-line source supplies a balanced three-phase load. If the line current IA is measured to be 15 A and is in phase with the line-to-line voltage, VBc, find the per-phase load impedance if the load is (a) Y-connected (b) A-connected. Calculate the complex ower S for each case.
3. Three single-phase, 10 kVA, 460/120 V, 60 Hz transformers are connected to form a three-phase 460/208 V transformer bank. The equivalent impedance of each transformer referred to HV side is 1.0 + j2.0 Ω. The transformer delivers 25 kW at 0.9 pf lagging at rated voltage. Answer the following questions: (a) Draw a schematic diagram showing the transformer connection. Draw three separate single-phase transformers and complete their primary and secondary connections. (b) Determine the magnitude of transformer primary and...
A three-phase generator connected in star generates a phase voltage of Vθ = 220 Vrms and supplies a three-phase load also connected in star. The three phases of the generator are connected to the three loads shown Remember that the return of the current of each charge is through the Neutral. a) Calculate the phase, line, load and neutral currents b) Calculate the phase, line and load voltages c) Calculate the powers of Apparent (S), Real (P) and Reactive (Q)...
A 240V three phase power system supplies two loads in parallel: Load 1: measured line current 30A, power factor 0.85 lagging, and Load 2: measured power 10kW, reactive power -7.5kVar A. Determine the power factor of load 2. B. Determine the total real power (in kW), reactive power (in kVAR), apparent power (in kVA), power factor and line current (in A) of the two loads.