Efficiency at full-load and half the full-load at 0.8 p.f. lagging current. Equivalent reactance referred to primary & referred to secondary..........ohm , ..........ohm Equivalent resistance referred to primary & referred to secondary..........ohm , ..........ohm Regulation of transformer at 0.5 p.f. lagging current The magnetizing current and reactance component of no-load are.........amper , .........ohm The working current and resistance component of no-load are.........amper , .........ohm *

Efficiency at full-load and half the full-load at 0.8 p.f. lagging current. Equivalent reactance referred to primary & referred to secondary..........ohm , ..........ohm Equivalent resistance referred to primary & referred to secondary..........ohm , ..........ohm Regulation of transformer at 0.5 p.f. lagging current The magnetizing current and reactance component of no-load are.........amper , .........ohm The working current and resistance component of no-load are.........amper , .........ohm *

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...

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For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
30-kVA, 2200/220-V, 50-Hz distribution transformer is tested for efficiencyand regulation as follows :O.C. test( Low voltage side ) : 220 V 4.2 A, 148 W S.C. test ( Low voltage side ) : 86 V 10.5 A, 360 W 1-The working current and resistance component of no-load are.........amper , .........ohm * 2-Efficiency at full-load and half the full-load at 0.8 p.f. lagging current. * 3-Equivalent resistance referred to primary & referred to secondary..........ohm , ..........ohm * 4-Regulation of transformer at 0.5 p.f. lagging current * 5-Equivalent reactance referred to primary & referred to secondary..........ohm , ..........ohm * 6-The magnetizing current and reactance component of no-load are.........amper , .........ohm *
In the circuit in Figure 2, the capacitor connected to the a-b terminals of the transformer anda circuit consisting of resistance is defined as a load circuit. a)Find the average power spent by the load circuit? b) How much of the average power calculated in a) by the resistance in the load circuit and how muchspent by the capacitor? Comment on the results obtained?
Q/ 30-kVA, 2200/220-V, 50-Hz distribution transformer is tested for efficiency : and regulation as follows O.C. test( Low voltage side ): 220 v 42 A 148 W S.C. test ( Low voltage side) : 86 V 10.5 A, 360 W Equivalent reactance referred to primary & referred to *secondary..ohm,...ohm 7.51, 0.0751 C 8.51, 0.0851 9.51,0.0951 6.71,0.0671 O *„Efficiency at full-load and half the full-load at 0.8 p.f. lagging current 96.95%, 97.52% O 97.40%, 97.30% C 93.52%, 95.64% O 97.95%, 97.89% O Equivalent resistance referred to primary & referred to * secondary..ohm, .ohm 4.26,0.0426 O 2.26, 0.0226 O 5.26,0.0526 O 3.26,0.0326 O The working current and resistance component of no-load are. .amper *. .ohm 0.76, 326.89 O 0.57, 236.89 0.87, 556.89 O 0.67, 436.89 O * Regulation of transformer at 0.5 p.f. lagging current 4.942% O 2.942% O 5.043% 3.043% O The magnetizing current and reactance component of no-load * are .amper. ..ohm 6.14, 74.1 O 4.14, 53.1 O 3.14, 44.1 5.14, 64.1 O o 0 O o 0 o
10 A three-phase transformer is given. The number of turns of the high voltage winding is N1=850 and the number of turns of the low voltage winding is N2=34. The high voltage winding is energized with V1= 10 kV rms line-to-line and V2= 400 V rms line-to-line has been taken from the low voltage winding. What is the connection of the low voltage winding if the high voltage winding is Y-connected? Εισαγάγετε την απάντησή σας
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With base MVA of 150 and base voltage of 33. If the reactance of the transformer is 0.23 pu. The parameter of the reactance of the transformer in the Neplan software is O 1.66 2.30 23 0.23 O Non of them