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The maximum size overcurrent device for primary only protection of a three-phase 45 kVA transformer with a 480V primary and a 120/208V secondary is

The maximum size overcurrent device for primary only protection of a three-phase 45 kVA transformer with a 480V primary and a 120/208V secondary is

Introductory Circuit Analysis (13th Edition)
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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Question
The maximum size overcurrent device for primary only protection of a three-phase 45 kVA transformer with a 480V primary and a 120/208V secondary is O a. 50A Ob.60A Oc. 70A Od.90A
Transcribed Image Text:The maximum size overcurrent device for primary only protection of a three-phase 45 kVA transformer with a 480V primary and a 120/208V secondary is O a. 50A Ob.60A Oc. 70A Od.90A
Expert Solution
Step 1 Definition

Transformer is a static device which transfers power from one circuit to another circuit without change in frequency.

As transformer does not change the frequency of the system, it can be treated as constant frequency device.

As transformer transfers almost same amount of power from one circuit to another circuit, it can be treated as constant power device.

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