A balanced Y-Y four-wire system has phase voltages bn Van = 12020° V, Von = 1202-120° V, V = 120/120° V The load impedance per phase is 19+ j13 and the line impedance per phase is 1+j2n, Solve for the line currents and neutral current.
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- VRY = 220 cis 0°, VYB = 220 cis -120° and VBR = 220 cis -240°. IR = 10 cis 0°. The load isbalanced and delta connected. Determine the: (a) Impedance per phase (b) Current perphase (c) Line currents.3. The single-line diagram of a three-phase power system is as shown in Figure Al-3. Impedances are marked in per unit on a 100-MVA, 400-kV base. The load at bus 2 is S2 = 15.93 MW – j 33.4 Mvar, and at bus 3 is S3 = 77 MW +jl4 Mvar. It is required to hold the voltage at bus 3 at 40020° kV. Working in per unit, determine the voltage at buses 2 and 1. V2 V1 V3 j0.5 pu j0.4 pu S2 S3 Figure A1-3In Figure 1, the 3-phase source has a line-to-line voltage of 440 volts. The details of the impedances are the following: Z₁ = 36-j15; Z₂ = 40 + /300; Z₂ = 45+j60 ; Z₂ = 75 + jo ; Z5 = 50+j50; Z6 = 20+ j48 2. Determine the following: (a) Line currents: labi, and I (c) Line currents: lar, Ibr, and ICT; (b) Line currents: Iaz, Ibz, and Iczi (d) PT, QT, ST, and pft for the system; (e) W, and W, readings for 2-wattmeter method at lines a and b. Balanced 3-Phase ab-bc-ca source C Figure 1 →laT -Ibr -KT 1 lal ²3 ↓ Ibi 1 Ici la2 lb2 le2ܝ 150 1²₂ OND
- 2) The one-line diagram of a three-phase power system is as shown in Figure. Impedance are marked in per-unit on a 100-MVA, 400-kV base. The load at bus 2 is S2=15.93 MW - j33.4 Mvar, and at bus 3 is S3-77 MW + j14 Mvar. It is required to hold the voltage at bus 3 at ...L0 kV. Working in per-unit, determine the voltage at buses 2 and 1. (Please determine the voltage magnitude within the specified limits: 410-450 V. By considering the voltage magnitude value you determined yourself, solve the question.) V₁ j0.5 pu V₂ j0.4 pu S₂ Figure V3 S3In a three-phase system the per-unit phase voltages are 100° , Vôn = 0.8Z180° Van 0.920° , Von = 0.92 - а What are the per-unit symmetrical components V0) and V)? Express in polar notation.2. The one-line diagram of a three-phase power system is as shown in the figure below. Impedances are marked in per unit on a 100-MVA, 400-kV base. The load at bus 2 is S2 = 15.93 MW-j33.4 Mvar, and at bus 3 is S3 = 77 MW +j14 Mvar. It is required to hold the voltage at bus 3 at 4006 0 kV. Working in per unit, determine the voltage at buses 2 and 1. V3 j0.5 pu V₂ S₂ j0.4 pu S3
- The one-line diagram of a three-phase power system is as shown in the figure attached. Impedances are marked in per unit on a 100-MVA, 400-kv base. The load at bus 2 is S(sub 2) = 15.93 MW - j33.4 Mvar, and bus 3 is S(sub 3) = 77MW + j14 Mvar. I tis required to hold the voltage at bus 3 at 400 angle 0 degrees kV. Working in per unit, determine the voltage at buses 2 and 1.Question 3. A three-phase impedance load balanced D a connected load in parallel with a balanced ? connected load made of bonding. D each arm for the load ?D = 6 + 6? and ? each arm for the connected load It is given as ?? = 2 + 2?. ? the connected load ?? = 1? is earthed through the neutral impedance. To this impedance load, the symmetrical component voltages ?0 = 10∠60°, ?1 = 100∠0° and ?2 = Unbalanced phase-to-earth voltages ??, ?? and ?? of 15∠200° volts were applied. a) Draw the zero, positive and negative sequence circuits. b) Find the complex powers imparted to each component circuit.The one line diagram of a three phase power system is as shown in Figure 7 Impedances are marked in per unit on a 100 MVA, 400 kV base The load at bus 2 is S2 15.93 MW - j 33.4 MVar, and at bus 3 is S3 77 MW + j 14 MVar It is required to hold the voltage at bus 3 at 400 kV Working in per unit, determine the voltage at buses 2 and 1
- In regards to the Sequence Networks of Impedance Loads, If the the positive sequence V1 = 1.03 angle(-8), the negative sequence voltage V2 = 0.03 angle(-34), and the zero sequence voltage Vo = 0, what is the a - phase voltage Va? a. 1.05 angle(-8.7) b. 1.00 angle(-7.2) c. 1.01 angle (-9.0) c.The one-line diagram of a three-phase power system is shown in the above figure. The line impedances are in per- unit on a 100-MVA base, and the line admittances are neglected. Use Gauss-Seidel method in Matlab to analyze the system the tolerance of error is 10-3. Then anwser the questions as follows. V, = 1.05200 0.01+ j0.025 300 + j200 MVA 0.015 + j0.035 150 MW 200 +j150 MVA 0.01+ j0.03 |V = 1.03 The admittance matrix (Y_bus)? 0.02 + jo.04 0.0125 + jo.03 2.A balanced three phase voltage of 360-V line-to-neutral is applied to a balanced Y-connected load with ungrounded neutral, as shown in figure-1. The three phase load consists of three mutually- coupled reactances. Each phase has a series reactance of Z, = j24 N, and the mutual coupling between phases Zm = j6 N. (i) Evaluate the line currents by mesh analysis without using symmetrical components. Evaluate the line currents using symmetrical components. (ii) j6 j24 j6 V. Figure-1