A 10 MVA, 115 kV/25 kV, 60 Hz, Y-A connected, three-phase power transformer has an equivalent series impedance of 0.03+j0.15 pu. The core loss resistance of the transformer is 100 pu and the magnetizing reactance is 30 pu. a) What is the transformer series impedance in N/phase referred to the HV side? b) The above transformer is used to deliver 7.5 MW at a voltage of 24 kV to a three-phase load with 0.866 lagging power factor. Determine the magnitude of the line-to-line voltage (in kV) applied at the primary side of the transformer (use per unit basis for the calculation). c) Determine the primary side line current (in A) and the efficiency of the transformer bank under the conditions in Part (b) (use per unit basis for the calculation).

A 10 MVA, 115 kV/25 kV, 60 Hz, Y-A connected, three-phase power transformer has an equivalent series impedance of 0.03+j0.15 pu. The core loss resistance of the transformer is 100 pu and the magnetizing reactance is 30 pu. a) What is the transformer series impedance in N/phase referred to the HV side? b) The above transformer is used to deliver 7.5 MW at a voltage of 24 kV to a three-phase load with 0.866 lagging power factor. Determine the magnitude of the line-to-line voltage (in kV) applied at the primary side of the transformer (use per unit basis for the calculation). c) Determine the primary side line current (in A) and the efficiency of the transformer bank under the conditions in Part (b) (use per unit basis for the calculation).

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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