j0.1 2.0+j0.5 j0.4 j0.2 1.01 3.
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a) Find the Y-bus power system in rectangular and polar coordinates.
b) Specify the type of each bus, and the known/unknown values.
c) What is the real and reactive power injections at buses 2 and 3?
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- Consider the system in the figure to the right. The Zbus for the system is given as follows: [j0.411 j0.310 j0.3541 Zbusj0.310 j0.446 j0.333 Lj0.354 j0.333 j0.450] j0.8 1.28/0 ele j0.2 vor j2.0 j0.5 m j0.4 m 2 a) Find the voltage at each bus. b) Find the current drawn by a capacitor having a reactance of 5.0 PU connected from bus 3 to the reference. c) Find the change in voltage at each bus when the capacitor is connected at bus 3. d) Find the voltage at each bus after connecting the capacitor. j1.0 1.20/30°Two relays each with 20-ohm resistance and 0.16-henry inductance are connected in series. What is the equivalent impedance?a. 20 + j102.2 ohms c. 20 + j95.32 ohmsb. 20 + j120.63 ohms d. 10 + j25.32 ohmsA Load of 250 kW is operating at 0.95 lagging power factor.Reactive power consumed by it is ____________ a. 82.17 b. 128.07 c. 130.00 d. 129.06
- A surge of 100 kV travels along an overhead line towards its junction with a cable. The surge impedance for the overhead line and cable are 400 ohms and 50 ohms respectively. The magnitude of the surge transmitted through the cable is ?a) Find the average power dissipated in the line shown.b) Find the capacitive reactance that when connected in parallelwith the load will make the load look purely resistive.c) What is the equivalent impedance of the load in (b)?d) Find the average power dissipated in the line when the capacitivereactance is connected across the load.Which of the following descriptions IS NOT correct for loads in power systems? A. The purely resistive load absorbs the real power from the power grid B. The purely inductive load absorbs the positive reactive power from the power grid C. The purely capacitive load absorbs the positive reactive power from the power grid. D. The average value of the instantaneous power through loads is equal to its real power. In an ac circuit, power factor correction or improvement is achieved by A. Connecting a resistor in parallel with the inductive load B. Connecting an inductor in parallel with the inductive load C. Connecting a capacitor in parallel with the inductive load A balanced delta-load can be converted to an cquivalent balanced wye- load by dividing the delta-load impedance by A. square root of 3 В.3 C. 1/3
- 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.For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ZLand ZLFind the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)d)Find the average power delivered to the circuit and Find the power factor of the circuit, and indicate whether it is leading or lagging, then Write the sinusoidal expressions for the currents and voltage.
- Two balanced loads are connected to the a 240kVrms60Hz line as shown in the figure below. Load 1 draws30kW at a power factor of 0.6 lagging and load 2 draws 45 kVAR at power factor of 0.8 lagging. The real power, reactive power, and magnitude of the line current absorbed by the combined load is close to kW, kVAR, and A. Two balanced loads are connected to the a 240kVrms 60Hz line as shown in the figure below. Load 1 draws 30kW at a power factor of 0.6 lagging kW. and load 2 draws 45KVAR at power factor of 0.8 lagging. The real power absorbed by the combined load is close to Balanced load 1 Balanced load 2Electrical load that draws current whose impedance varies throughout the cycle of the input ac voltage waveform is known as nonlinear load. True FalseThe total power drawn by the two-impedance load in parallel is 26kW at 0.98 power factor lagging, it is being supplied by a 230-volts AC source. One of the loads (Load 1) takes 16kVA at 0.77 power factor lagging. What is the reactive power of the unknown impedance (Load 2)?