2-16. Can a 60-Hz transformer be operated on a 50-Hz system? What actions are neces- sary to enable this operation?
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Fundamentals of Energy Systems HW5 Q4
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- 3. An 100-KVA, 2500/125-V, 50-Hz, step-down transformer has the following parameters: R₁ = 1.50, X₁ = 2.8 2. : R₂ = 15 m , : X₂ = 20m2,: Re - 3k, and: Xm 5 KQ. The transformer delivers 85% of the rated load at a terminal voltage of 110 V and a power factor of 0.866 lagging. Use the approximate circuit referred to as the primary. a. Determine the efficiency of the transformer. b. And the voltage regulation TA three-winding transformer is connected to an AC voltage source as shown in the figure. The number of turns is as follows: N₁ = 100, N₂ = 50, N3 = 50. If the magnetizing current is neglected, and the currents in two windings on secondary side are 2230° and 22150°, then what is the value of the primary current in Ampere? I 0000000000- N₁ № ₂ Z 00000 00000 Z N3 H I₁₂ I₁₂₁ ¹3A 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.
- If P1 and P2 be the iron and copper losses of a transformer at full load, and the maximum efficiency of the transformer is at 75% of the full load, then what is the ratio of P1 and P2 ?What is an electrical transformer? Discuss basic principles of operation and applications of electrical transformers. Can you relate electromagnetic induction to the operation a 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
- Problem 2 A 23-kVA, 2300/230-V, 60-Hz, step down transformer has the following resistance and leakage- reactance values: R1=40, R2=0.04N, X1=12N, 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.Solv1) What happens to the waveform of the magnetizing current of a power transformer as the transformer primary voltage is increased and the transformer becomes more and more saturated? What is the effect on the harmonic content of the transformer magnetizing current? 2) What are the effects of saturation on the magnetizing current, no-load power losses, and efficiency of a power transformer? 3) What are the advantages and disadvantages of operating a power transformer with little or no saturation?