A balanced abc-sequence Y-connected source with Van = A-connected balanced load (10+j2)Q per phase. Calculate the phase and line currents. 100430°V is connected to a
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- Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) FalseOne advantage of balanced three-phase systems over separate singlephase systems is reduced capital and operating costs of transmission and distribution. (a) True (b) FalseFigure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G:90MVA22kVx=0.18perunitT1:50MVA22/220kVx=0.10perunitT2:40MVA220/11kVx=0.06perunitT3:40MVA22/110kVx=0.064perunitT4:40MVA110/11kVx=0.08perunitM:66.5MVA10.45kVx=0.185perunit Lines I and 2 have series reactances of 48.4 and 65.43, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.
- 1. A balanced three-phase Y-source with Vph "E" V rms drives a Y-connected three-phase load with phase impedance ZA = " F" Q, ZB = "G" N, and Zc= "H" N. Calculate the line currents and total complex power delivered to the load. Assume that the neutrals are connected. E=230 F= 90 G= 9+j5 H= j903 phase balanced Wye connected inductive loads have PLOAD When connected to VGEN three phase generator as shown in figure below. In this figure Van is reference voltage. (Generator internal resistance and line impedance are neglected. PLOAD and Van values are given in Table1.) a. Calculate the line currents (laA,IbB,and IcC) b. Calculate the line voltages (Vab,Vbc,and Vca) A N IbB bA balanced Y-connected generator with terminal voltage Vbc 5 200/08 volts is connected to a balanced-D load whose impedance is 10/408 ohms per phase. The line impedance between the source and load is 0.5/808 ohm for each phase. The generator neutral is grounded through an impedance of j5 ohms. The generator sequence impedances are given by Zg0 5 j7, Zg1 5 j15, and Zg2 5 j10 ohms. Draw the sequence networks for this system and determine the sequence components of the line currents.
- A delta connected load with Zab=3 + j2 Ohm, Zbc=3 + j4 Ohm and Zca=2 + j3 Ohm are connected the end of a three-phase line as shown in the figure. The line impedance is 1+j2 Ohm per phase. The line is supplied from a three-phase source with line-to-line voltage of Vab=200.0/0° V rms. Taking the phase current vector lab as the reference vector, determine; (a) Line current Ia. (b) Total complex power supplied from the source. (c) Magnitude of the line-to-line voltage at the load terminal. ao- bo- Co- 1+j2 b aIn a star connected three-phase balanced system, the angle between line voltage and phase voltage is a. 30 degree O b. 90 degree c. 120 degree O d. 180 degreeCalculate the line currents in the following 3-phase balanced system (at load). The voltage source connected to the load is in the form va (t) = 100.coswt and phases b and c are offset by 120 degrees. Does a current flow through the delta connection? Prove it and show it with calculation. LA ICA A IAB 20/45° Ω VCA VAB 20/45° B - 20145° N VBC Ic
- a balanced three phase voltage of 100v line to neutral is applied to a balanced y connected load with undergrounded neutral . the three phase load consists of three mutually coupled reactances. each phase has a series reactance of Zs=j12 ohm and the mutual coupling between the phases is Zm=j4. determin the current using symmetrical components2. One phase voltage of a three-phase wye-connected load is Vbn=340VZ+20° . Ib la vab 340V@+20 Vbc Vca a. Calculate the line-to-line voltages Vab, Vbc, and Vca (including the phase) on the transmission lines. b. Show that KVL is true for the loop around this 3-phase load, a to b to c and back to a (or any other closed path).The following three-phase circuit is symmetrical, with line voltage 220 V, 60 Hz, direct phase sequence, isolated neutral and the value of the impedances of the loads in the three phases are: Zan = 10 ohms Zbn = -10j ohm Zcn = -10j Ohm Find:a) Phase voltages on the load;b) Line and phase currents;c) The power supplied to the load. Consider the phase voltage in the reference(Va voltage angle equal to 0)