You have been hired as an engineering consultant to diagnose an overheating and low output voltage problem with a three-phase transformer. The service technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and a single phase of the transformer is rated at 50 kVA, 6900/400 V, 60 Hz. The transformer cannot be disconnected for open and short circuit testing and only the input lines and output outlets are accessible for current and voltage measurements. (a) The following measurements were taken after and during working hours when all the electrical devices were off and on,respectively. No load condition: Input Phase Current = 32-60°A, Output Voltage = 400<0°V Load condition: Input Phase Current = 8.452-37.35°A, Output Voltage = 370Z-0.64°V Assuming the input voltage is maintained at its rated value, calculate the modelled internal parameters Ro, Xm, Reqand Xeq of the transformer referred to the high voltage side.

You have been hired as an engineering consultant to diagnose an overheating and low output voltage problem with a three-phase transformer. The service technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and a single phase of the transformer is rated at 50 kVA, 6900/400 V, 60 Hz. The transformer cannot be disconnected for open and short circuit testing and only the input lines and output outlets are accessible for current and voltage measurements. (a) The following measurements were taken after and during working hours when all the electrical devices were off and on,respectively. No load condition: Input Phase Current = 32-60°A, Output Voltage = 400<0°V Load condition: Input Phase Current = 8.452-37.35°A, Output Voltage = 370Z-0.64°V Assuming the input voltage is maintained at its rated value, calculate the modelled internal parameters Ro, Xm, Reqand Xeq of the transformer referred to the high voltage side.

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

The full-load copper losses and iron losses. of a transformer are 6400 W and 5000 W respectively. The copper loss and iron loss at half full-load will be respectively (i) 3200 W and 2500 W (ii) 1600 W and 5000 W (iii) 3200 W and 5200 W (iv) 1600 W and 1250 W
The major drawback of an auto transformer is
I ONLY NEED B PART III ANSWERED. NO OTHER PART OF THE QUESTION. You have been hired as an engineering consultant to diagnose an overheating and low output voltage problem with a three-phase transformer. The service technicians informed you that the transformer has a solid nickel core, insulated aluminum windings and a single phase of the transformer is rated at 50 kVA, 6900/400 V, 60 Hz. The transformer cannot be disconnected for open and short circuit testing and only the input lines and output outlets are accessible for current and voltage measurements. (a) The following measurements were taken after and during working hours when all the electrical devices were off and on,respectively. No load condition: Input Phase Current = 3∠−60°A, Output Voltage = 400∠0°V Load condition: Input Phase Current = 8.45∠−37.35°A, Output Voltage = 370∠−0.64°V Assuming the input voltage is maintained at its rated value, calculate the modelled internal parameters Ro, Xm, Reqand Xeq of the transformer…
Select the correct statement for step down transformer. a. Primary number turns = Secondary number turns b. Primary number turns Secondary number turns d. Secondary number turns = 0
Which of the following is the range of excitating current (in percent) of its rated current for a small distribution transformer? 25 Equal to rated current 6 None of option OO0O
What are the objectives of conducting an open circuit test on single phase transformer?
Experimental Values: 200 800 100 1002 Table - Measured Values Input voltage Input Current Output Voltage Output current Vp [V] Ip [A] Vs [V] Is [A] 5.1 0.916 15 0.166
Find the elements of the equivalent circuit attributed to the secondary of a single-phase transformer. The no-load voltages in the primary and secondary circuit are 200 volts and 400 volts, respectively, with a frequency of 50 Hz. The primary no-load current at the voltage of 200 volts is 0.7 amperes and the loss of the core is equal to 70 watts. The resistance and reactance of the primary are 3.2 ohms and 1.25 ohms, respectively. The resistance and reactance of the secondary are 0.6 ohm and 0.07 ohm, respectively. Draw the equivalent circle, showing the values of its elements.
I need the expert's solution with an explanation of the reason.
4. Why the efficiency of the transformer is high at half load compared to full load?
b) The parameters of the transformer equivalent circuit are given bellow, Primary =1290. Secondary winding turns =130. The resistance of the primary winding =0.2 O. The resistance of the secondary winding =0.06 N. The leakage reactance of the primary winding =1.47 Q. The leakage reactance of the secondary winding =0.07 Q. using the above parameter values, referred to the primary winding, determine (a) Equivalent resistance, (b) Equivalent reactance, (c) Equivalent impedance and (d) The phase angle of the impedance.