Calculate (a) the full load efficiency at unity power factor; (b) the voltage at the secondaryterminals when supplying full load secondary current at power factor (1) unity (2) 0.8lagging (3) 0.8 leading, for the 4kVA, 200/400V, 50Hz, single phase transformer, ofwhich the following are the test figures: Open-circuit with 200V applied to primarywinding: current 0.8A, power 70W. Short-circuit with 17.5V applied to secondary (highvoltage) side: current 9A, power 50W.

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Engineering

Electrical Engineering

(a) the full load efficiency at unity power factor;

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 3.9P

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Concept explainers

Compensation Techniques

The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the system of the components like sensors used in the control system. The basic compensation technique involves lag compensation, lead compensation or the combination of the both.

Question

Calculate (a) the full load efficiency at unity power factor; (b) the voltage at the secondary
terminals when supplying full load secondary current at power factor (1) unity (2) 0.8
lagging (3) 0.8 leading, for the 4kVA, 200/400V, 50Hz, single phase transformer, of
which the following are the test figures: Open-circuit with 200V applied to primary
winding: current 0.8A, power 70W. Short-circuit with 17.5V applied to secondary (high
voltage) side: current 9A, power 50W.

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