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- 2. A three-phase transmission line has parameters Xc-6 k 2, R-3.25 2 and X₁-25 92, and delivers 300 MW to a load with both ends of the line at 230 kV. Draw a pi equivalent per-phase circuit of the line. On a per-phase basis, calculate the active power delivered to the load, the reactive power of the line and the active power delivered by the source. Based on these calculations can the equivalent circuit be simplified further?2. A single-phase are distributor AB is fed from end A and has a total impedance of (0.3-0.3) ohm. At the far end, the voltage V-240V and the current is 100A at a p.f. of 0, 8 lagging. At the mid-point M. a current of 100 A is tapped at a p... of 0.6 lagging with reference to the voltage V_{M} at the midi-point. Calculate the supply voltage V Lambda j sending current I_{N} and the phase angle between V_{A} and V_{E}l. A single-phase distributor AB has a total impedance 0f (0.1+j0.2) ohms. At the far end B, a current of 80A at 0.8 pf lagging and at mid-point C a current of 100A at 0.6 pf lagging are tapped. If the voltage at B is maintained at 200V, determine the sending end voltage.
- New Microsoft Word... Soarch References Mailings Review View Help 1. A balanced three-phase Y-source with Vph = "E" V ms drives a Y-connected three-phase load with phase impedance ZA = "F" , Z = "G" 2, and Zc= "H" S2. Calculate the line currents and total complex power delivered to the load. Assume that the neutrals are connected. I E=214 Vrms F=76 G=3+6j H=70jQ12. The voltages at the terminal of a three-phase balance load consisting of three 10-0 resistors connected in Y are: Vab > 78.99425. 87°, Ve = 69. 394-83.5°, and Vca = 86.1254156.4° V. If there is no connection to the neutral of the load. a. Find the line currents from the symmetrical components of the given line-voltages. b. Find power expended in the three 10-0 resistors by using the symmetrical components of currents and voltages.A single-phase distributor AB has a total impedance 0f (0.1+j0.2) ohms. At the far end B, a current of 80A at 0.8 pf lagging and at mid-point C a current of 100A at 0.6 pf lagging are tapped. If the voltage at B is maintained at 200V, determine the sending end voltage
- Figure Q2(a) shows a positive sequence three phase circuits. Given a line-to-line voltage at generator, ERY = 415230°V. With assumption that all load impedance are balanced, Zn=Zyb=Zbr= 15 + jl8 2, determine all phase currents at each load and line currents. Include the phasor diagram for all currents in your analysis. R Zry Zyt Figure Q2(a) If the transmission line in three phase circuit at Figure Q2(a) has a impedance of 1+j20 for each phase, determine the phase voltages for each load with using an appropriate analysis. Use phase voltage at generator, ERN as a reference. Then determine the total apparent power, active power and reactive power supplied by the generator.A single phase line has an impedance of 0.4+j2.7 ohms. The line feeds two -single phase loads that are connected in parallel. The first load is absorbing 264.1 kVA at 0.707 power factor lagging. The second load absorbs 44kW at unity power factor. The voltage at the load end of the line is 2200 V. Assuming at the load end of the line as the reference axis. Determine the magnitude of the voltage at the source end of the line.1 PROBLEM 20020° V rms, Vbn 1. A balanced three-phase Y-Y system has the phase voltages of Van 200/120° V rms, and Ven = 2002(-120°) Vrms. The load impedance per phase is Z₁ = 50 - j100 n. a Van Vcn n Vbn Ia Ib Ic B Zu (b) Determine the line currents Īa, Ip and Īc. (c) Determine the total average power delivered to the three loads. N C = ZL (a) The balanced three-phase circuit has a negative phase sequence. Circle your choice. (1) True (ii) False
- P 12.7-5 A three-phase Y-connected source simultaneously supplies power to two separate balanced three-phase loads. The first total load is A connected and requires 39 KVA at 0.7 lagging. The second total load is Y connected and requires 15 kW at 0.21 leading. Each line has an impedance 0.038 +0.072 f/phase. Calculate the line-to-line source volt- age magnitude required so that the loads are supplied with 208-V rms line-to-line.The three-phase source line-to-neutral voltages are given by Ean=100,Ebh=10+240, and Ecn=10240volts. Is the source balanced? (a) Yes (b) NoA balanced three-phase load is connected to a 4.16-kV, three-phase, fourwire, grounded-wye dedicated distribution feeder. The load can be mode led by an impedance of ZL=(4.7+j9)/phase, wye-connected. The impedance of the phase conductors is (0.3+j1). Determine the following by using the phase A to neutral voltage as a reference and assume positive phase sequence: (a) Line currents for phases A, B, and C. (b) Line-to-neutral voltages for all three phases at the load. (c) Apparent. active, and reactive power dissipated per phase, and for all three phases in the load. (d) Active power losses per phase and for all three phases in the phase conductors.