11.24 In a balanced three-phase wye-wye system, the source is an abe-sequence set of voltages. Zine = 1 + jln. Zload 14+ j120, and the load voltage on the a phase is VAN = 440/30° V rms. Find the line voltage Vai
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- Draw a 3-phase wye-connected generator with transmission lines connected to a 3-phase delta-connected load. Assume the lines connecting them have an inductance of j5 per phase. The generated voltages are 120 Vrms with phase 'a' having a phase angle of 0°. The loads are 10 Ohm resistors per phase. When drawing, make sure to label all 3 phases with voltage phasors, line inductances, and load resistances.5. The figure below shows two star connected loads with three phase power. The voltage source is 120Z0°. The loads are Z₁ = 10 + j4 № and Z₂ = 2 +j3 №. The cables are negligible. Calculate: a) the line and phase current. b) the real power from the source. c) the reactive power of the circuit. Is V N Z₁ Z₁ Z₁ Z₂ Z₂ N N Z₂If a A-connected load has a balanced impedance ZA 94 - 17° 2 and a voltage = = / VBC = 265 82° V rms, what is the magnitude of the current Ia (in A rms)? C V cn Van a Answer: n Von b Ia Ib 20 B IAB IBC ZA ZA ICA C
- A balanced load is connected in star across a 3 phasec415V 50Hz supply. The load consists of a coil of resistance 25 ohms and inducrance 0.5 henry in paeallel with a purw resistance of 28 ohms and a pure capaciror of 60microfarads capacitance ,in each branch. Calculate a. The line currents? Need full working and answer has to be 9.3A Formola for inductance XL= 2×3.142FL FORMOLA FOR CAPACITOR XC= 1/2×3.142×FCThe following loads are served by a balanced three-phase source: Load 1: 18 kVA at 0.8 pf lagging Load 2: 8 kVA at 0.8 pf leading Load 3: 12 kVA at 0.75 pf lagging. Give the complex power expression for Load 3. Select one: O a. 29.80 +j13.94 O b. O c. 9.00+ j7.94 kVA 6.40 -j4.80 KVA O d. 32.90225.07° KVA O e. 14.40 +j10.80 kVAIn the circuit in the figure; L1 load draws 15 kVA with lagging power factor 0.6. The L2 load draws 6 kVA with a leading power factor of 0.8. According to this; What is the value of the complex power for the L2 load?
- 2. For the following system shown in the figure, calculate: a. The current through each phase of the load. b. The total real and reactive power of the three-phase load. c. The power factor at the load side. A 220 V 20° 220VL-120° U8 vol 152 I 220 VI20° 9. M.Two delta connected loads are connected in parallel and powered by a balanced Y-connectedsource. The smaller of two loads draws 10 kVA at a lagging power factor of 0.75 and the largerdraws 25 kVA at a leading power factor of 0.8. The line voltage is 400 V. Calculate a) The powerfactor at which the source is operating. b) The total power drawn by the two loads. c) The phasecurrent of each load.)Two complex loads Z1 and Z2 are connected in parallel and powered by a value voltage effective 7.2 kV and frequency 60 Hz. The first load has a power of 50 kVA and a factor of rear power of 0.9. The second charge has a power of 45 kW and a rear power factorof 0.91. Determine in steady state the kVAR power and the capacity required to correct the Total power factor to a value of 0.97 rear.
- Calculate "terminal" phase voltage of phases "a" and "c" of generator. Calculate Vab and Vca across the load. Calculate three phase power supplied by the source. ]Calculate three phase power losses.2. A voltage applied to a load is V=208420°V and current through load is I=10 &-10° A. Find the following [SO 1] o complex power consumed by load • Is the load inductive or capacitive? o the power factor of the load o the reactive power consumed or generated by the load. o Does the load consume or supply reactive power? 3. A single phase motor draws 20 kVA at 0.70 lagging power factor from a 120 V source. The PUD desires to improve the power factor to 0.9 lagging by connecting a shunt capacitor bank across the terminals of the motor. Determine the size of the capacitor bank in VARS. Calculate the following: [SO 1] a) What are the initial load current, real and reactive powers of the load? b) What are the real and reactive power after adding the capacitor bank? c) What is the kVAr rating of the capacitor bank? (3) d) What is the load current? di) How is the load current affected by the load reactive power?8. The total power supplied to a balance delta load is found in the same way as for a balance wye load. True False Either Neither 12. A load of 20 + j35 ohms is connected across a 220 V, 60 Hz supply. Find the reactive power of the load in var. 595 2420 1042 1382 13. A type of DC source where the characteristic output voltage has perfect unidirectional waveform and is based on electrochemical principle. Generator Inverter Converter Battery 14. Calculate the Rf of a circuit whose impedance is 20+j35 and current of 2A. 0.86 0.91 0.50 0.71 15. What capacitor shall be installed in parallel with a circuit to achieve a unity power factor if the reactive power of a circuit is 200VARS and the voltage is 100V. 80.45 microfarad 53.05 microfarad It's already in unity 62.45 microfarad