3.4 A single-phase 100-kVA, 2400/240-volt, 60-Hz distribution transformeris used as a step-down transformer. The load, which is connected to the240-volt secondary winding, absorbs 60 kVA at 0.8 power factor laggingand is at 230 volts. Assuming an ideal transformer, calculate the follow-ing: (a) primary voltage, (b) load impedance, (c) load impedance referredto the primary, and (d) the real and reactive power supplied to the pri-mary winding.

Answered: Image /qna-images/answer/79256697-7403-4d25-9e23-efe68d3d2603.jpg

Answered: 3.4 A single-phase 100-kVA,…

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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The figure below shows the equivalent circuit of a nominal 240V-120V, 1000 VA, single-phase transformer, having an actual (no-load) voltage ratio of 240V - 125V. Predict the results of the open circuit test (Voc, Ioc and Poc) and the short circuit test (Vsc, Isc, and Psc) given that: (i) the open circuit test will be done on the low voltage side at rated nominal conditions, and (ii) the short circuit test will be done on the high voltage side at rated nominal conditions. Show all work. Present your final answers in the table below as magnitudes only. 1.902 0.750 1000VA E, 240V-125V E Ep 2.1kn 1kn Short Circuit Test Open Circuit Test Voc Vsc Isc Ioc Psc Рос
Solve for the efficiency at three-eight load at 0.85 power factor of a 10-kVA single phase transformer with the full load copper loss and core losses are 152 and 128 watts, respectively. Determine the secondary terminal voltage when transformer is delivering full load secondary current at 0.95 power factor of a 20-kVA transformer steps down from 6,600 V to 480 v. The resistances of the primary and secondary windings are 12 ohms and 0.08 ohm, respectively.
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A single - phase transformer has 0.9 power factor and takes a no - load current of 0.8A . Determine the values of the magnetising and core loss components of the no - load current
Find the elements of the equivalent circuit relative to the secondary of a single-phase transformer. The no-load voltages in the primary and secondarypement are 200 and 400 volts, respectively, with a trend of 50 Hz. The no-load current at 2, 50. Voltage 200 volts is equal to 0.7 amperes, and the cores are equal to 70 watts, 1.25 ohms, respectively, the resistance and reactance of the secondary 0.6, 7... Ohms, respectively. Draw the assigned circle Explaining the values of its elements.
(a) A 5 MVA 230/11.5-kV single-phase power transformer has a per-unit resistance of 1.5% and a per-unit reactance of 6% (data taken from the transformer's nameplate). The transformer approximate equivalent circuit is given in the figure below. The open-circuit test performed on the low-voltage side of the transformer yielded the following data: Voc = 120 kV loc = 12 A Poc = 40 kW Refer to the low-voltage side of the transformer and calculate: (i) The value of Req and Xeq. (ii) The value of Rc and Xm. (ii) The voltage regulation when secondary voltage Vs = 11 kV and the secondary current Is = 350 A. kIp Reg jXcq 1, Vp Re V.
Vr 3. For a 1.2 accuracy class potential transformer used at a lagging phase angle y of 10', the RCF value is A. 0.991. B. 0.988. C. 0.977. D. 0.999. primary connection scheme that must be used with
A transformer on no-load has a core-loss of 70 W, draws a current of 2.5 A (rms) and has an induced emf of 230 V (rms). Determine the no-load power factor, core-loss current and magnetizing current. Also calculate the no-load circuit parameters of the transformer. Neglect winding resistance and leakage flux.
(b) A 40-kVA, 2600/1300-V, single-phase transformer has a core loss of 620 W. The transformer has a high voltage winding resistance of 0.15 Q and a low voltage winding resistance of 0.0125 Q. Neglect the effect of primary and secondary inductances and calculate the transformer efficiency at the rated load and unity power factor.
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