QUESTION 5 ✓ A 100 kVA, 7200 -480 V 50 Hz single phase transformer has the following parameters all given in ohms: RLS = 0.00800 RHS = 1.96 RfеHS = 53.2 XLS = 0.01510 XHS=4.55 XMHS=7800 This transformer is operated in step-down mode and delivers 75% of its rated power to a load that has a power factor of 0.93 lagging. a) Draw the equivalent circuit model of the transformer with the equivalent series Z's referred to the high voltage side (3 Marks) b) Find the total Zin of the transformer at the high side (3 Marks) c) Find input Z of the transformer with the load disconnected (3 Marks) d) Find input voltage at 75% of the load required to maintain the rated load voltage (3 Marks) e) Find an exciting current with the load disconnected (3 Marks). 60 Marks

QUESTION 5 ✓ A 100 kVA, 7200 -480 V 50 Hz single phase transformer has the following parameters all given in ohms: RLS = 0.00800 RHS = 1.96 RfеHS = 53.2 XLS = 0.01510 XHS=4.55 XMHS=7800 This transformer is operated in step-down mode and delivers 75% of its rated power to a load that has a power factor of 0.93 lagging. a) Draw the equivalent circuit model of the transformer with the equivalent series Z's referred to the high voltage side (3 Marks) b) Find the total Zin of the transformer at the high side (3 Marks) c) Find input Z of the transformer with the load disconnected (3 Marks) d) Find input voltage at 75% of the load required to maintain the rated load voltage (3 Marks) e) Find an exciting current with the load disconnected (3 Marks). 60 Marks

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 3.5MCQ: For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is...

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