6 The circuit in Figure P7.56 shows the use of idealtransformers for impedance matching. You have alimited choice of turns ratios among availabletransformers. Suppose you can find transformers withturns ratios of 2:1, 7:2, 120:1, 3:2, and 6:1. If Z, is475Z – 25°2 and Z, must be 2672 – 25°, find thecombination of transformers that will provide thisimpedance. (You may assume that polarities are easilyreversed on these transformers.) n3in4'abZzell

Given values are = Available turns ratio are =

Answered: 6 The circuit in Figure P7.56 shows the…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A A-A transformer bank consists of three individual transformers each with its rating given in the figure. Y 32.3 - j223 HO Z = 0.0143 + j0.0181 2 %3D %3D 2400 240 V 50 kVA a) Give the bank rating. b) Draw and completely label with numerical values, the per-phase equivalent circuits referred to the high-side and the low-side. c) If the transformer bank is delivering half-rated kVA at rated voltage, 0.8 pf leading, what is the input line.voltage.? d) What is the load impedance? e) What is the bank efficiency and voltage regulation at this load?
Given the following Resistances and Inductors in Series and Voltage Source: R1 = 84 ohms R2 = 13 ohms %3D L1 = 0.55 Henry L2 = 0.98 Henry Vs = 30 Volts %3D Frequency = 63 Hz What is the Total Reactance?
For all questions in this page, assume that the transformer is ideal. One side of a transformer has 280 turns while the other side has 140 turns. The high voltage side is connected to a 120 Vrms source. The low voltage side (secondary) is connected to an impedance Z₁ = 11.7 + j6.8 0. provide at least 2 digits after the What is the value of the load impedance when referred to the primary? Referred impedance = Q
7.18 A single-phase motor draws 220 W at a power factor of 80 percent (lagging) when connected across a 200-V, 60-Hz source. A capacitor is connected in parallel with the load to give a unity power factor, as shown in Figure P7.18. Find the required capacitance. ell ww
What is the purpose of transformers in power distribution, and how do they work?
A 500 MVA synchronous machine has H, = 5.6 MJ/MVA and a 1200 MVA machine has H₂ = 2.0 MJ/MVA. The two machines operate in parallel in a power station. What is the equivalent. H constant for the two, relative to a 100 MVA base?
5.7. In Figure P5.7, the voltages at a, b, and c are balanced 30. Transformers are ideal and have the same turns ratio. Find the voltages Va, Vic, and Vea in terms of Vab, Vher and V ca (a) Are they balanced 30? (b) If not, how would you reconnect the transformers to obtain balanced 36? a rele b 6 b' 000 ( Figure P5.7
4. Would you parallel a delta-delta (A - A) 3-phase transformer bank with a delta-wye (A - Y) bank, assuming their output and input terminal voltages are equal? Justify your answer by superimposing their separate vector diagrams. (Hint solve the short circuit current at the secondary for %Z = 5%) Ans. Isc=518% of secondary current
3. A non-ideal 1-phase transformer has turns ratio 5:1 with 120Vac primary. The primary impedance is 1 + j1 Ohms, and the secondary impedance is 0.2 + j0.2 Ohms. Assume the core impedance (R0 and X0) can be neglected. A resistive load of 12 Ohms is connected to the secondary. What is the primary current magnitude? What is the secondary voltage magnitude? What is the efficiency of this transformer with this load?
What do the connection angles and groups show in transformers? For example, where are the Yy0 , Dy5 ,Yd5, Yz5 group transformers used?
Draw the per-phase equivalent circuit of a three-phase squirrel-cage induction machine. List all of the elements in the equivalent circuit and briefly state their function
A center-tapped transformer has the schematicrepresentation shown in Figure. Theprimary-side voltage is stepped down to twosecondary-side voltages. Assume that each secondarysupplies a 5-kW resistive load and that the primary isconnected to 120 V rms. Finda. The primary power.b. The primary current.

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