2. A Y-connected balanced three-phase generator with an impedance of 0.4 + j0.32 per phase is connected to a Y-connected balanced load with an impedance of 24 + j19 per phase. The line joining the generator and the load has an impedance of 0.6 + j0.7.2 per phase. Assuming a positive sequence for the source voltages and that Van = 120230 V find: (a) the line voltages, (b) the line currents
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- Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.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.AC Power and Power Factor 1. Two loads are connected in parallel across a 13,200-volt line. Load A draws 200kW at 0.6 p.f. (lagging), load B takes 200kVA at 0.8 p.f. (lagging). Find the reactive, apparent and true power and the line current.
- Suppose you have a three-phase generator that provides 120 Vac per phase and works at a frequency of 60 Hz, this generator can be connected in both delta and star. Also consider the following 6 load impedances, which will be connected at the same time to the generator as follows: ZA, ZB and Zc are connected in star, while Zp, Zg and Zp are connected in delta. j20 j3n Za j20 ZA j30 j3n -j20 j 30 -j20 Zo -j20 ZE j30 -j2n j 3n. ZF Assume the generator is star-connected with neutral, calculate total system power, total power factor, and current in neutral.Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Zload = 500 236.87° ohm, and the transmission line's impedance is Zline = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.A 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.
- 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. ' qu V = 1.05200 0.01+ j0.025 300 + j200 MVA 3 0.015 + j0.035 150 MW 200 + j150 MVA 0.01 + j0.03 |V = 1.03 The admittance matrix (Y_bus)? The bus power in per-unit?a. Y-Connected b. В 100kW Source 0.9 LAG 80KVA 0.8 LAG Figure 1 80kW 0.85 LAGA 3-phase generator possesses a synchronous reactance of 62 (line reactance between the source and the load) and the excitation voltage Eo = 3KV (source) per phase. Calculate the line-to-neutral voltage ELoad for a balanced resistive load of 8. Also, draw a phasor diagram between three-phase source and load voltages.
- 4) A balanced delta connected load of ...+j18 ohm per phase is connected at the end of a three phase line as shown in figure. The line impedance is 1+j2 ohm per phase. The line is supplied from a three-phase source with a lie- to-line voltage of 207.85 V rms. Taking Van as reference, determine the following: a) Current in phase a. b) Total complex power supplied from the source. c) Magnitude of the line-to-line voltage at the load terminal. (Please determine the impedance value within the specified limits: 16-26 V. By considering the impedance value you determined yourself, solve the question.) ao- |V₂| bo Co- 1 +j2 Ω = 207.85 V www Figure a Jum ...+j18 n bSuppose you have a three-phase generator that provides 120 Vạc per phase and works at a frequency of 60 Hz, this generator can be connected in both delta and star. Also consider the following 6 load impedances, which will be connected at the same time to the generator as follows: ZA, ZB and Zc are connected in star, while Zp, Zg and Zp are connected in delta. j20 Za -j20 ZA j 30 j 30 -j20 j3a -j20 Zo -j20 ZE j30 -j20 j 30. Assume the generator is star connected with no neutral, calculate the total power of the system and the total power factor. mm mCan you explain the given questions in an original way? Single Phase and Three Phase Principles • Single Phase Generators • Two Phase Generators