A 15 kVA, 6000/415 V transformer is to be tested to determine its excitation branch components, its series impedances and its voltage regulation. The following test data have been taken from the transformer Open-circuit test (low voltage side) Voc = 480V Ioc = 2.1 A Pos = 120 W Short-circuit test (high voltage side) Ve = 150 V %3D Ise = 6.0 A Pe = 180 W a) Illustrate the equivalent circuit of this transformer referred to primary side. b) Illustrate the equivalent circuit of this transformer referred to secondary side. c) Calculate the full-load voltage regulation at 0.85 lagging power factor using exact equation for Vp. Sketch the phasor diagram

A 15 kVA, 6000/415 V transformer is to be tested to determine its excitation branch components, its series impedances and its voltage regulation. The following test data have been taken from the transformer Open-circuit test (low voltage side) Voc = 480V Ioc = 2.1 A Pos = 120 W Short-circuit test (high voltage side) Ve = 150 V %3D Ise = 6.0 A Pe = 180 W a) Illustrate the equivalent circuit of this transformer referred to primary side. b) Illustrate the equivalent circuit of this transformer referred to secondary side. c) Calculate the full-load voltage regulation at 0.85 lagging power factor using exact equation for Vp. Sketch the phasor diagram

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.10P: A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding...

See similar textbooks

Similar questions

For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the rated voltage on the other winding? (a) Yes (b) No
The ratings of a single-phase three-winding transformer are as follows:*primary winding: 300 MVA, 14kV*secondary winding: 300MVA, 200kV*tertiary winding: 40MVA, 20kV. The leakage reactances are:*Xps = 0.1 at 300MVA, 14kV*Xpt = 0.16 at 40MVA, 14kV*Xst = 0.14 at 50MVA, 200kV Neglecting the winding resistance and exciting current, calculate Xp, Xs and Xt using 300 MVA and 14kV as the base for the primary winding.
What is the relationship between primary induced emf( E1) and applied voltage (V1) of a Transformer? O a. Both are unequal and in phase O b. Both are unequal and 180 degree out of phase O c. Both are equal and 180 degree out of phase O d. Both are equal and inphase
A single-phase transformer has a voltage ratio on open circuit of 7900/660 V. The primary and secondary resistances are 0.55 ohm and 0.035 ohm respectively. The corresponding leakage reactances being 4.22 ohm and 0.18 ohm. The load is equivalent to a coil of resistance 3.85 ohm and inductive reactance of 4.2 ohm. Determine the terminal voltage of the transformer and the output in kW when supplying a given load using approximate equivalent circuit when the applied voltage is 7912 V. Your answer
Draw a block diagram of a power supply from transformer up to regulator with corresponding waveform.
A 400/200 volts transformer has pu impedance of 0.05. The HV side voltage required to circulate full load current during short circuit test is
6. 150 kVA, 2800-240 V, 50 Hz transformer. Regis = 0.0082N , Xeq.Ls = 0.0223N RfcHs=2200N Step down transformer delivers 135 kW to a load at 0.9 lagging power factor at rated voltage. Determine the Following: a) Terminal voltage (LV side). b) Terminal voltage (HV side). c) High side current. d) Input impedance. e) Voltage regulation. f) Efficiency. g) Voltage regulation for 0.9 leading pf. h) Draw the phasor diagram of secondary circuit at 0.9 lagging pf. i) Draw the phasor diagram of secondary circuit at 0.9 leading pf. XmHs=12002
Q7/ Complete the blank The copper loss of a transformer at 4/5 of the full load is 4000 W, full load copper loss will be..........................................?
In a buck converter, what are the benefits and disadvantages if the changes of duty cycle is drastic i.e, fast system response? How about when duty cycle changes slowly i.e, slow system response?
4. 100 kVA, 6800-240 V, 50 Hz single phase step down transformer has the following parameters: RLs=0.0082 RHs=2.62 Rfe-HS=50002 XLs=0.015N XHs=5.2N Xm.Hs=88002 Transformer is delivering 80% of rated load at rated voltage and 0.95 lagging power factor. Determine the following: a) The equivalent impedance of the transformer referred to primary. b) Input impedance of the combined transformer and load. c) Actual input voltage at HV side. d) Input impedance if load is disconnected. e) Exciting current at no load.
A three-phase uncontrolled bridge rectifier delivers power to a resistive load of 10N. The output voltage of the rectifier is 400 V DC. The rating of source side of three phase delta – star transformer is, (a) 14.875 kVA (b) 16.765 kVA (c) 15.475 kVA (d) 16.025 kVA
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?