a. i. Why do power systems operate in an interconnected arrangement? ii. How is the frequency controlled in a power system? iii. What is meant by the stiffness of a power system?
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- Which termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerIn a house there is a three-wire system configured as follows: A refrigerator with an impedance of (10 + j 10) Ω is connected to line L1 and to a neutral. And to line L2 and neutral all the lighting in the house consisting of 10 luminaires of 20 W each. In addition, there is a 240 V dryer that consumes 8 kW connected between the two lines. Calculate current in line L1, line L2 and neutral total power consumed Problem was Initially stated in spanish, i will add it in case it works. En una vivienda se tiene un sistema trifilar configurado de la siguientemanera. Se tiene conectada a la línea L1 y a neutro una refrigeradora con impedancia de (10 + j 10)Ω y a la línea L2 y neutro toda la iluminación de la casa consistente en 10 luminarias de 20 W cadauna. Además, se tiene una secadora a 240 V que consume 8 kW. Calcule a) corriente de la línea L1 yde la línea L2 y de neutro b) potencia total consumida.A three-phase system has balanced conditions so that the per-phase circuit representation can be used as shown in Figure 1 Select the turns ratio of the step-up and step-down transformers that the system operates with an efficiency greater than 99 percent. Moreover, find the complex power (received or given) of all components in the circuit and the V1 and V2 voltages. The load voltage is specified as 4 kV rms, and the load impedance is 4/3 ohm. ..
- 3) State the relation between line and phase values of voltage and current for 3-phase STAR connected load .state the equation for active, reactive power consumed by 3-phase load.The VSWR on an 50-Ohm transmission line is 5. The distance between successive voltageminima is 80 cm while the distance from the load to the first minimum is 30 cm. What are thereflection coefficient and load impedanceExplain the concept of microgrids and their role in improving the resilience of local power distribution.
- The electrical power supply system of a particular country is made of the following. Draw asingle line diagram of the electrical power supply system of the country based on the informationbelow using any computer-aided software.Power supply from an infinite bus bar S connected to bus bar A, through a circuit breakerconnected between isolators and a three-phase delta/star solidly earthed transformer T1.Powersupply source from a generator G1 connected to bus bar B through a circuit breaker connectedbetween isolators, and a three- phase delta/star solidly earthed transformer T2. power supplysources from two generators G2 and G3. Each of the generators are connected to a reactor.Furthermore, each of the generators connected to a common bus bar C through a circuit breakerconnected between isolators and a three-phase star/star solidly earthed transformer T3 and T4respectively. bus bar F to bus bar A by means of two isolators, one at each end of transmissionline L6; bus bar A to bus bar E by…The power system insulation problem involves a. Capacitance of earth and subsequent grounding b. Selection of basic insulation level of system equipment c. Determination of single phase line insulation d. Determination of three phase line insulation Clear my choiceDEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC CIRCUITS NOTE: Please solve in this way. 1. Please have a good handwriting, some of the answers are not readable. Thank you! 2. GIVEN.(include symbols and units) 3. REQUIRED/FIND/MISSING (with symbol/s) 4. ILLUSTRATION (Required). 5. STEP-by-STEP SOLUTION with Formulas and Symbols. No Shortcut, No skipping, and detailed as possible 6. FINAL ANSWERS must be rounded up to three decimal places PROBLEM: • A delta-connected load whose phase impedances are ZAB=50 Ω, ZBc=-j50 Ω, and ZcA=j50Ω is fed by a balanced wye-connected three phase source with Vp=100 V. Find the phase currents.
- a)High Voltages are preferred for Transmission of Electricity. Why? b) Why Generation Voltage Levels are low in the range of 11 kV/ 33 kV etc? c) Why ACSR Conductors are preferred over Copper Conductors? d) Overhead Transmission Lines are preferred for Transmission of Power for Long Distances, why? e) Alternating Current is preferred over Direct Current in Power System, Why? f)Write the Installed Generation Capacity of Sultanate of Oman with curent enerqy share of Conventional and Non-Conventional Energy Sources. g) Why the Capacitance effect is neglected in Short Transmission Line. h) Distinguish between Lumped or Distributed elements in a Transmission Line.An electrical lineman is connecting three single-phase transformers in a Y(primary)-Y(secondary) configuration, for power service to a business. Draw the connecting wires necessary between the transformer windings, and between the transformer terminals and the lines: Note: fuses have been omitted from this illustration, for simplicity.Consider the following power system model with the following entities:i. A generator generates a sinusoidal waveform with amplitude of 300 V and angular frequency of 5 radians,ii. The transmission line has a resistance of 1Ω, andiii. A capacitive load with a value of 2F presents at the end of the system. Answer the following questions:(a) Draw the relevant diagram and label all entity values of the power system as described above.(b) Replacing the real source in Figure from part (a) with a complex source, find the response of the steady-state capacitor voltage in time-domain.(d) Repeat the sub-question (a) above, now showing calculations in s-domain.