1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred toLV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When ratedcurrent is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A.a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging.b. Find the efficiency of this transformer at full load, 0.8 power factor lagging.c. If standard open-circuit and tests were performed on this transformer, what would be the measuredvalues of these tests?2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformertested at 50 Hz:Voltage (V) Current (A) Power (kW)LV winding with HV terminals open-circuited:38109.868.14HV winding with LV terminals short-circuited:92014110.3a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltagewinding.b. Calculate the cantilever equivalent-circuit parameters as referred to the transformer low-voltagewinding.c. With the transformer carrying rated load and rated voltage at its low-voltage terminal, calculate thepower dissipated in the transformer.d. Repeat part a and b in per-unit. Compare and comment on your result.3. A three-phase Y-Y transformer is rated at 25 MVA, 13.8-kV:69-kV and has a single-phaseequivalent series impedance 62 + j388 m2 referred to the low-voltage winding.a. A three-phase short circuit is applied to the low-voltage winding. Calculate the voltage applied to thehigh-voltage winding which will result in rated current into the short circuit.b. The short circuit is removed and a three-phase load is connected to the low-voltage winding. Withrated voltage applied to the high-voltage winding, the input power to the transformer is observed tobe 18 MW at 0.75 power-factor lagging. Calculate the line-line terminal voltage at the load.4. A 45-kVA, 120-V:280-V single-phase transformer is to be connected as a 280-V:400-Vautotransformer. Determine the voltage ratings of the high- and low-voltage windings for thisconnection and the kVA rating of the autotransformer connection.

Dear student as per our guidelines we are supposed to solve only one question.kindly repost other…

1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. If standard open-circuit and tests were performed on this transformer, what would be the measured values of these tests?

1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. If standard open-circuit and tests were performed on this transformer, what would be the measured values of these tests?

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...

See similar textbooks

Similar questions

1) Identify, which component of no load current supplies hysteresis loss, in a practical transformer? a. None of these b. IM c. IC d. I0
The rating of current transformer is given as 200/5A 5P10 20VA. Assume that the secondary resistance of the CT is 0.12 Ω. Calculate the following values when the accuracy limit factor is 24. - New accuracy current limit - New secondary impedance - New burden in VA ...
The cross-sectional area of a transformer limb is 80 cm2 and the volume of the transformer core is 5000 cm3.The maximum value of the core flux is 10 mWb at a frequency of 50 Hz. Taking the Steinmetz constant as 1.7, the hysteresis loss is found to be 100W. Determine the value of the hysteresis loss when the maximum core flux is 8 mWb and the frequency is 50 Hz.
7. The primary and secondary induced e.m.fs. El and E2 in a two-winding transformer are always..... (a) equal in magnitude (b) antiphase with each other (c) in-phase with each other (d) determined by load on transformer secondary 8. A step-up transformer increases... (a) voltage (c) power (b) current (d) frequency. 9. The primary and secondary windings of an ordinary -winding transformer always have........... (a) different number of turns (b) same size of copper wire (c) a common magnetic circuit (d) separate magnetic circuits. 10. The ordinary efficiency of a given transformer is maximum when........... (a) it runs at half full-load (b) it runs at full-load (c) its Cu loss equals iron loss (d) it runs slightly overload. 11. The maximum efficiency of a 100-kVA transformer having iron loss of 900 kW and F.L. Cu loss of 1600 W occurs at ....... kVA. 70 12. The kVA rating of an ordinary 2-winding transformer is increased when connected as an autotransformer because..... (a) 56.3 (b)…
A step down transformer rated 2200:220 having an effective core area of 100sqcm. and has 120 turns on the secondary side. What is the number of turns in the primary side and the flux density having induce emf on the secondary of 100v and operating frequency of 60Hz.
??
Q-Electrical machines A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is.
An ideal transformer circuit is shown in Figure Q4(a). Its primary and secondary turns are 400 and 200 respectively. (1) Calculate the rms primary current. (ii) Calculate the rms flux in the transformer core. (iii) State two losses that contribute to transformer active power loss that have been ignored in this ideal model. N, Ny 30 + j30 2 300 sin50t Figure Q4(a) 00000000
A 150 kVA, 2500/250 V, 50 Hz, single phase transformer has a no-load current of 0.75 A and a core loss of 850 W, when the high voltage side is energized at rated voltage and a frequency. Determine the following : 1) The core loss component of no-load current 2) The magnetizing component of the no-load current 3)The core loss resistance on the high voltage side in ohm 4)The magnetizing resistance on the high voltage side in ohm
Only detailed descriptionand and complete answer is required.
Single phase half wave AC-AC converter has a resistance of R = 50 ohms. Input voltage is given as 230 Vrms. Transformer conversion ratio is 1:1. If T1 thyristor is triggered at 60 degrees; a)Rms output voltage? b)Output power? c)RMS load current and average load current? d)Input power factor? e)Average and RMS thyristor current?
Q5. A 20 kVA, 2000/200-V, 50-Hz transformer has a high voltage winding resistance of 0.2 2 and a leakage reactance of 0.240. The low voltage winding resistance is 0.05 and the leakage reactance is 0.02 2. Find the equivalent winding resistance, reactance and impedance referred to the (i) high voltage side and (ii) the low-voltage side. (Draw the related equivalent circuits)