Q3. Each phase of a delta-connected load comprises a resistance of 300 and an 80µF capacitor in series. The load is connected to a 400V(rms), 50HZ, 3-phase supply. a. Draw the circuit diagram b. Calculate the phase current, line current, the total power dissipated and the kVA rating of the load.
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- Two impedances consist of resistance of (15 ohms and series connectedinductance of 0.04 henry) and (resistance of 10 ohms, inductance of 0.1 henryand a capacitance of 100 microfarad, all in series) are connected in series andare connected to 230 volts, 50 – Hz AC source. Find: (a) current drawn, (b) voltageacross each impedance, (c) individual and total power factor. Draw the phasordiagram.An alternating voltage of 110 volts is applied to a circuit with resistance of 8.66 Ohms, inductance of 0.106 Henries, and capacitance of 75.8 microFarads. The frequency of the voltage is 50 Hz. Determine: a. The current in the circuit and its phase angle relative to the applied voltage. b. The voltage drop across each component of the circuit. c. The active and reactive power inputs to the circuit. d. Draw (Not hand-sketch) the equivalent power triangle. e. Is the RLC load of the circuit inductive or capacitive? Why?1. A load of 50 ohms resistance and 0.4 H inductance are connected in series to 100 volts, 60 hz a-c source. What must be the value of the capacitance to be connected in parallel to the circuit to raise the power factor to 0.96 lagging. Draw the circuit diagram.
- A series circuit consisting of 20 ohm resistance and 20 mH inductance is connected across a 220 volts (RMS) 60 hz supply. Determine the magnitude of the total current in the circuit.(b) Differentiate between single phase and three phase alternating current (A.C) supply for the following aspects with adequate comparisons and sketches: (i) Generation of single phase and three phase e.m.f.s (ii) Sine waveforms(iii) Advantages or disadvantages of both phasesUse 3 decimal places and box the final answer. A 4-ohm resistor is in series with a 7.96-mH inductor connected across a 110-V 60-Hz source. Determine : a) the impedance b) the input current c) the voltage across the resistor and the inductor d) Draw the phasor diagram showing the current and the voltages. e) The power factor and the power input to the circuit.
- Task 3 A three phase, four wire star connected load consisting of: ZR: a resistor of 9500 in series with a 3H inductor ZB: a resistor of 1950 ZY: a resistor of 1950 in series with a 4µF capacitor Using the equipment available in the power lab (Room T017), connect the given load to a three-phase supply available in the lab and: 3.1. Determine the current of each line and the neutral current and measure the total power supplied by the source. 3.2. Analytically, calculate all currents and the total power and compare with those obtained in measurements. 3.3. Device a method and measure the waveform of the neutral current. Discuss the obtained waveform and the reason for any distortion in the waveform 3.4. Validate your calculations using computer simulationa. Using Ohm’s Law, compute the voltage and current for eachcomponent. Use the formula Z = Vt / It. b. Compute and record the magnitude and phase angle of the impedanceusing the equation Z= R + RL + jXL – JXC. Use 3uF for the value of C,1.006H for the value of L and for the resistance is computed based onthe specification of the lamp. c. Compute and record for the total power using the formula: Pcomputed = Scosθ d. Compute and record the reactive power and apparent power using theformula Scomputed = V2/ZQcomputed = √S2 − P2 e. Compute for the reactive power (measure) and apparent power(measured) using the formula.Q = PtanθS = P/ cos θ f. Compute the percent difference between the measure and the computedvalue of the impedance.60. An RLC series circuit connected to a 110-volt and 50-cycle AC source, contains the following series resistances and reactances: R1=10 ohm, R2= 15, XL1=20 ohms, XL2=25 ohms, XC= 40 ohms. Find the real power. a. 65.3899 b. 392.4372 c. 397.848 d. 588.6559
- For the circuit given in Figure 1, a) Find the Thevenin equivalent circuit with respect to terminals a-b b) When a 5000 resistor is connected to terminal a-b, find the voltage on the resistor wwwwwwmm c) It will be connected to a-b terminals and its voltage on 5000 load will be 132 kV rms. What should be the capacitive reactance value that will increase it? wwwwwwwww d) What happens to the short-circuit current when the a-b terminals are short-circuited? 2+1202 000 m da 127/6 kV rms ob 1.5 +/902 000 w 12725 kV msA utility company plans to connect a total of 20uF of capacitance to a 7200 volt line. To make this connection four capacitors will be connected in series. What is the capacitance of each capacitor? Answer is 80uF. What is the minimum AC voltage rating of each capacitor? Answer is 1200 volts. What is the current flow through the circuit? And what is the minimum kVAR rating of each capacitor?A parallel connection of a RL branch with a C branch is connected across a 100V AC mains. At first R = 10 ohms, L = 20mH and frequency of 1000rad / s, the current measured is 2.2361A at 89.44 leading power factor. A) Determine the initial capacitance. B) However, a fault occurs on the capacitor branch making its capacitance 20% lower and a resistance of 5 ohms is detected. If this faulty circuit is rerun but at a frequency of 500 rad / s, determine the new current that will flow through the circuit