4) Power Transformer.20KVA, 8000/240V Measurements: Open ckt: VOC-8000V; IOC-0.214A POC-400 W.Short ckt test: VSC-489, Isc-2.5A, PSC-240W. Both tests measured on Primary.Determine Open circuit power factor.b) Determine excitational admittance.Determine Rc and XM.d) Determine Short circuit power factor.Determine series equivalent impedance, referred to the primary.Determine the series resistance and reactance, referred to the primary.Sketch the approximate equivalent circuit referred to the primary.

Answered: 4) Power Transformer. 20KVA, 8000/240V…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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Question

4) Power Transformer.
20KVA, 8000/240V Measurements: Open ckt: VOC-8000V; IOC-0.214A POC-400 W.
Short ckt test: VSC-489, Isc-2.5A, PSC-240W. Both tests measured on Primary.
Determine Open circuit power factor.
b) Determine excitational admittance.
Determine Rc and XM.
d) Determine Short circuit power factor.
Determine series equivalent impedance, referred to the primary.
Determine the series resistance and reactance, referred to the primary.
Sketch the approximate equivalent circuit referred to the primary.

Expert Solution

Step 1

Given data

Power transformer rating;

$20 KVA$ , $8000/240 V$

Open circuit test;

$V_{O C} = 8000 V I_{O C} = 0.214 A P_{O C} = 400 W$

Short circuit test;

$V_{S C} = 489 V I_{S C} = 2.5 A P_{S C} = 240 W$

To find out

a. Open circuit power factor, b. excitation admittance, c. $R_{C}$ and $X_{M}$ , d. Short circuit power factor, e. Series equivalent impedance referred to primary side, f. Series resistance and reactance referred to primary side, g. Approximate circuit referred to primary side.

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