Fundamentals of Energy Systems HW5 Q7 2-6. Why does the power factor of a load affect the voltage regulation of a transformer?

Answered: 2-6. Why does the power factor of a…

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter11: Thermostats, Pressure Switches, And Other Electric Control Devices

Section: Chapter Questions

Problem 24RQ

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Q2- Describe various losses in transformer. Explain how each loss varies with load current, supply voltage
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The 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.
Q2-A)- Enumerate the various losses in transformer. Explain how each loss varies with (Load current, supply voltage). B)- Draw the pharos diagram at load on primary side.

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