A 4 KVA, 200/400, single phase transformer has equivalent resistance and reactance referred to low voltage side equal to 0.5 and 1.5 ohms respectively. Find the terminal voltage on the HV side when it supplies 3/4 FL at 0.8 pf lagging. The supply voltage is 200 V. Find also the efficiency if coreloss is 100W. Your answer

A 4 KVA, 200/400, single phase transformer has equivalent resistance and reactance referred to low voltage side equal to 0.5 and 1.5 ohms respectively. Find the terminal voltage on the HV side when it supplies 3/4 FL at 0.8 pf lagging. The supply voltage is 200 V. Find also the efficiency if coreloss is 100W. Your answer

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 3.1P: (a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a...

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(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3
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
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