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- The instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsTwo 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.Three Impedances each of (8 - j18) are connected in mesh across a three-phase 410V ac supply. Determine the phase current, line current, active power, reactive power drawn from supply. Also draw the Phasor diagram for the mesh connection and marks the Line current ,phase current line voltage and phase angle between phase current and pahse voltage. I phase current (Ip) Line current real power reactive power
- A three-phase A-connected generator has an inter- nal impedance of 0.6 + j4.8 N/4. When the load is removed from the generator, the magnitude of the terminal voltage is 34,500 V. The generator feeds a A-connected load through a transmission line with an impedance of 0.8 + j6.4 N/þ. The per-phase impedance of the load is 2877 – j864 N. a) Construct a single-phase equivalent circuit. b) Calculate the magnitude of the line current. c) Calculate the magnitude of the line voltage at the terminals of the load. d) Calculate the magnitude of the line voltage at the terminals of the source. e) Calculate the magnitude of the phase current in the load. f) Calculate the magnitude of the phase current in the source.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.Answer the question the below Image. A single phase transmission line is delivering 500 kVA load at 2 kv. Its resistance is 0-20 and inductive reactance is 0-40. Determine the voltage regulation if the load power factor is 0-707 lagging. O 8.5 % O 7.2 % O 6.4 % O 5.3 % Continue
- 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?Three symmetrical three-phase loads are connected in parallel. Load 1 is connected in Y with an impedance of 400 + j300Ω / φ, load 2 is connected in with with an impedance of 2400 - j1800Ω / φ and load 3 is evaluated at 172.8 + j2203.2 kVA. Loads are supplied from a distribution line with an impedance of 2 + j16Ω / φ. Size of the voltage between the line and the neutral conductor at the end of the charge the line is 24√3 kV. The operating frequency is 50 Hz.(a) Calculate the line currents and the phase currents of the loads.(b) Calculate the total complex power at the receiving end of the system.(c) Calculate the total complex power at the transmitting end of the line.(d) Calculate the values of the compensation capacitors which are connected from the line to the neuron at the load end of the system so that the power factor at the load end reaches pf ≥ 0.98.(e) What if the capacitors are connected from one line to another? What would be the best choice for compensation, the…There is an installation with two equal three-phase loads of 150 kW each and a power factor of 0.9 in lagging. By connecting a pure reactive element in parallel, the reactive power at the input of the installation is 160 kVARS, with a lagging power factor. It can be said that:A)Capacitors were connected and the fp improved. B) Capacitors were connected and the fp improved. C) Reactors were connected and the fp improved. D)Reactors were connected and fp improved. E) None of the above
- A short transmission line is represented by an impedance of 0.01 + jo.04. What is the voltage regulation for a unity source and full-load current of 1.934-8° per-unit? O a. 0.8% O b. 1.2% c. 2.8% d. 0.3% O OConsider the following three phase balanced circuit. 21020° Vrms j0.5 N rell 24- j21 N 210Z-120° Vrms j0.5 N 24- j21 2 12 rell 24- j21 2 210/120° Vrms j0.5 N rell Find average power dissipated by the delta connected load. (a) 8587.18 W (b) -8587.18 W (c) 7514.41 W (d) -7514.41 w2. Three-Phase SystemThree loads are connected in parallel to a 12.47 kV, 60 Hz three-phase supply.Load 1: Inductive load, 60 kW and 660 KVARLoad 2: Capacitive load, 240 kW at 0.8 . power factorLoad 3: Resistive load 60 kWDefine:a. Active power, reactive power and total apparent power?b. Total power factor ?c. What is the total supply current?A Y-connected capacitor bank, connected in parallel withload, to improve the overall power factor to 0.95 lagging.Define:d. Total capacitor capacity (KVAR)?e. Capacitance of a phased capacitor (UF)?f. How big is the line current after the capacitor bank is installed?