8. A 10 power transformer supplies a load 8 kW of power at a power factor of 0.77 lagging at full load. The voltage at the load is 115V. The transformer has 1200 turns on its primary and 450 windings on its secondary. The iron loss is 325 Watts and the primary copper loss is 150 Watts and the secondary copper loss is 260 Watts. Find a) The full load apparent power and the secondary and primary currents at full load. b) The resistance of the primary and secondary windings. c) The transformer's full load operating efficiency as a percent.

8. A 10 power transformer supplies a load 8 kW of power at a power factor of 0.77 lagging at full load. The voltage at the load is 115V. The transformer has 1200 turns on its primary and 450 windings on its secondary. The iron loss is 325 Watts and the primary copper loss is 150 Watts and the secondary copper loss is 260 Watts. Find a) The full load apparent power and the secondary and primary currents at full load. b) The resistance of the primary and secondary windings. c) The transformer's full load operating efficiency as a percent.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Single Phase Transformer

A single-phase transformer is a type of power transformer. It is an electrical device that accepts converts the single phase alternating power into single phase alternating power. In this power conversion the voltage is stepped up or down. If the voltage is stepped up, the current will be stepped down and if the voltage is stepped down, the current will be stepped up.

Question

8. A 10 power transformer supplies a load 8 kW of power at a power factor of 0.77 lagging at
full load. The voltage at the load is 115V. The transformer has 1200 turns on its primary and
450 windings on its secondary. The iron loss is 325 Watts and the primary copper loss is 150
Watts and the secondary copper loss is 260 Watts. Find
a) The full load apparent power and the secondary and primary currents at full load.
b) The resistance of the primary and secondary windings.
c) The transformer's full load operating efficiency as a percent.

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Step 2: Calculations to find the value of Apparent power (sub part-a).

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Step 3: Calculations to find the value of Secondary current (sub part-a).

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Step 4: Calculations to find the value of Primary current (sub part-a).

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Step 5: Calculations to find the value of the primary winding resistance (sub part-b).

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Step 6: Calculations to find the value of the secondary winding resistance (sub part-b).

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Step 7: Calculations to find the value of the Transformer full load operating efficiency (sub part-c).

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