2-6. Why does the power factor of a load affect the voltage regulation of a transformer?
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Fundamentals of Energy Systems HW5 Q7
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- What is the purpose of a transformer? Draw the symbols for a transformer.For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) NoWhy is it important to reduce the moisture within a transformer to acceptable levels during transformer installation?
- How does a transformer work in a power system, and what are its applications in voltage conversion?The turns ratio of a particular transformer is less than 1. Where would you expect to see this type of transformer? OI. A 0 0 0 0 0 Power Plant K Generation II. A and B III. B IV. B and C V. C VI. C and A A Station High-Voltage Power Lines Transmission B Substation C Distribution Power Lines ( .00 Industrial Consumer Commercial Consumer Residential Consumer DistributionThe first picture is the question the second pic i did not understand that step of %75 of the load means what ?
- 1. In a transformer, which options are correct:A. Works on Faraday’ law and Ampere’s lawB. DC current in the primary winding will produce voltage output in the secondary windingC. Copper losses are caused by reluctance in magnetic circuitD. Frequency of input power source will not govern the voltage induced in secondary circuit.2. Voltage ratio of input voltage and output voltage in IDEAL transformer depends on:A. Leakage fluxB. Magnetization currentC. Copper loss currentD. Turns ratio3. The core of transformer must have:A 23-kVA, 2300/230-V, 60-Hz, step down transformer has the following resistance and leakage- reactance values: R1=40, R2=0.040, X1=120, and X2-0.120. The transformer is operating at 75% of its rated load. If the power factor of the load is 0.866 leading. Determine the efficiency of the transformer.4. In a transformer, which options are correct: A. Works on Faraday’ law and Ampere's law B. DC current in the primary winding will produce voltage output in the secondary winding C. Copper losses are caused by reluctance in magnetic circuit D. Frequency of input power source will not govern the voltage induced in secondary circuit. 5. Voltage ratio of input voltage and output voltage in IDEAL transformer depends on: A. Leakage flux B. Magnetization current C. Copper loss current D. Turns ratio 6. The core of transformer must have A. Low reluctance C. High reluctance B. High resistance D. Low resistance 7. An overexcited synchronous motor behaves like: B. Resistive load D. DC generator A. Inductive load C. Capacitive load 8. The amount of real power delivered by a synchronous generator connected to an infinite bus can be controlled by adjusting A. System frequency C. Full load frequency B. No load frequency D. Terminal voltage
- P2-Draw the equivalent circuit of a single-phase transformer and explain how the core losses are almost invariant to the load (current). How do they depend on the terminal voltages of the transformer? Also, using the equivalent circuit explain how the copper losses depend on the load current.How does change in frequency affect the operation of a given transformer? Ans. 1. Iron loss........ increases with a decrease in frequency. A 60-Hz transformer will have nearly 11% higher losses when worked on 50Hz instead of 60 Hz. However, when a 25-Hz trans- former is worked on 60 Hz, iron losses are reduced by 25%. 2. Cu loss..........in distribution transformers, it is independent of frequecy. 3. Efficiency...........since Cu loss is unaffected by change in frequency, a given transformer effi- ciency is less at a lower frequency than at a higher one. 4. Regulation........regulation at unity power factor is not affected because IR drop is independent of frequency. Since reactive drop is affected, regulation at low power factors decreases with a decrease in frequency and vice-versa. For example, the regulation of a 25-Hz transformer when operated at 50-Hz and low power factor is much poorer. 5. Heating..........since total loss is greater at a lower frequency, the temperature is…If we increase the load than core loss and copper loss will... Decrease Increase Remain same
