The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 82,8% for a load with unity power factor at rated power. Relative short circuit voltage% Uk = 30.0 and relative no-load current% I0 = 30. Since the transformer (Star-delta) is connected; Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase valueWhen given, it must be specified separately. Therefore, all current-voltage information given in the question are line values. 1-) Draw the primary reduced equivalent circuit. 2-) What is the power value measured in the short circuit test of this transformer? 3-) What is the iron loss value of this transformer ?
The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 82,8% for a load with unity power factor at rated power. Relative short circuit voltage% Uk = 30.0 and relative no-load current% I0 = 30. Since the transformer (Star-delta) is connected; Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase valueWhen given, it must be specified separately. Therefore, all current-voltage information given in the question are line values. 1-) Draw the primary reduced equivalent circuit. 2-) What is the power value measured in the short circuit test of this transformer? 3-) What is the iron loss value of this transformer ?
Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter25: Electromagnetic Induction
Section: Chapter Questions
Problem 69A
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The efficiency of a 20 kVA 15.4 / 0.4 kV three-phase power transformer is 82,8% for a load with unity power factor at rated power.
Relative short circuit voltage% Uk = 30.0 and relative no-load current% I0 = 30.
Since the transformer (Star-delta) is connected;
Note: In 3-phase electrical machines, the current-voltage information given on the label is always line values. Phase valueWhen given, it must be specified separately. Therefore, all current-voltage information given in the question are line values.
1-) Draw the primary reduced equivalent circuit.
2-) What is the power value measured in the short circuit test of this transformer?
3-) What is the iron loss value of this transformer ?
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