Format Parte bed WORDL Fort Paragraph Draw the equivalent circuit for a 3000/400-V, I- phase transformer on which the following test results were obtained. Input to high voltage winding when L.v. winding is open-circuited: 3000 V, 0.5 A, 500W. Input to L.v. winding when H.v. winding is short-circuited: 11 V, 100 A, 500 W. Insert the appropriate values of resistance and reactance. I 26-1-27

Format Parte bed WORDL Fort Paragraph Draw the equivalent circuit for a 3000/400-V, I- phase transformer on which the following test results were obtained. Input to high voltage winding when L.v. winding is open-circuited: 3000 V, 0.5 A, 500W. Input to L.v. winding when H.v. winding is short-circuited: 11 V, 100 A, 500 W. Insert the appropriate values of resistance and reactance. I 26-1-27

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 3.11MCQ: For a short-circuit test on a 2-winding transformer, with one winding shorted, can you apply the...

See similar textbooks

Similar questions

Please explain each step
dc tansformd
If the secondary side of a dual-voltage single phase transformer, as per figure 1, were to be connected in series, the rated output current would be equal to the -A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". If secondary side of the a dual-voltage single phase transformer, as per figure 1, were to be connected in paralle, the rated output current would be equal to the A- current rating of the individual coils, B- sum of the current rating of the individual coils, C- either "a" or "b", D- neither "a" nor "b". The poles of a magnet tend to be____________. A - at the ends of the magnet, B- in the middle of the magnet, C -all around the magnet, D- none of the above.
The circuit diagram of a wye wye transformer is shown below. It has a neutral to ground resistor in the right side winding. Again, the transformer turns ratio is 1 in this problem. Calculate the currents IA, IB and IC for the zero sequence currents Ia=Ib=Ic=1/0o Calculate the current in neutral resistor Rn, and the voltage across this resistor. Calculate the neutral to ground current in the right side winding. What is the value of the neutral to ground current in the right side winding when Rn is replaced by an open circuit? Draw the zero sequence circuit of this transformer, and show the zero sequence current flow in this diagram when Rn is finite.
11- The output current corresponding to maximum efficiency for a transformer having core loss of 100 W and equivalent resistance referred to sccondary of 0.25 2 is .. ampere. a- 20 b-25 c- 5 d- 400
A transformer has primary and secondary turns of 1250 and 125 respectively. It has core cross-sectionof 36 cm2 and its rms flux density is to be limited to 1.4 T (to prevent core saturation). Whatmaximum 50 Hz voltage can be applied on the primary side and the corresponding open-circuitsecondary voltage?The core has a mean length of 150 cm and its relative permeability can be assumed to be 8000. Whatwould be the rms exciting current when the transformer’s primary winding is excited at a voltage ascalculated above? Also calculate the magnetizing susceptance as seen from primary and secondarysides.If the transformer were to be excited at 60 Hz, 1. What should be the maximum primary voltage for thecore flux density limit not to be exceeded? 2. What would be the magnetizing susceptance as seen oneach side in this case?
A voltage transformer in Figure 8 has 1,500 turns of wire on its primary winding and 500 turns of wire for its secondary winding. What will be the turns ratio, a of the transformer. If 240 volts is applied to the primary winding, what will be the resulting secondary voltage. And if a 400 n resistor is connected to the secondary winding, what are the values of current Is and Ip. primary Vp Transformer Core NF Ns Figure 8 secondary Vs
9. A single-phase transformer has a turn ratio of 6, the resistances of the primary and secondary windings are 0.9 £2 and 0.025 2 respectively and the leakage reactances of these windings are 5.4 92 and 0.15 2 respectively. Determine the voltage to be applied to the low- voltage winding to obtain a current of 100 A in the short-circuited high voltage winding. Ignore the magnetising current.
Can you solve D and E
The first picture is the question the second pic i did not understand that step of %75 of the load means what ?
A 22.5-kVA single-phase transformer is tested with a true-RMS ammeter and an ammeter that indicates the peak value. The true-RMS reading is 94 A. The peak reading is 204 A. Should this transformer be derated? If so, by how much?
3.6. A 60-kVA, 4800/2400-V single-phase transformer gave the following test results: 1. Rated voltage is applied to the low voltage winding and the high volt- age winding is open-circuited. Under this condition, the current into the low voltage winding is 2.4 A and the power taken from the 2400 V source is 3456 W. 2. A reduced voltage of 1250 V is applied to the high voltage winding and the low voltage winding is short-circuited. Under this condition, the current flowing into the high voltage winding is 12.5 A and the power taken from the 1250 V source is 4375 W. (a) Determine parameters of the equivalent circuit referred to the high volt- age side. (b) Determine voltage regulation and efficiency when transformer is operat- ing at full-load, 0.8 power factor lagging, and a terminal voltage of 2400 V. (c) What is the load kVA for maximum efficiency and the maximum effi- ciency at 0.8 power factor? (d) Determine the efficiency when transformer is operating at 3/4 full-load, 0.8 power…