Given that a 400-kVA, 3-phase transformer has a 480-V primary and a 208/120-V secondary. a) Calculate primary full-load amps b) Calculate required feeder breaker and conductor ampacity c) Calculate secondary full-load amps d) Calculate required secondary breaker size and conductor ampacity

Given that a 400-kVA, 3-phase transformer has a 480-V primary and a 208/120-V secondary. a) Calculate primary full-load amps b) Calculate required feeder breaker and conductor ampacity c) Calculate secondary full-load amps d) Calculate required secondary breaker size and conductor ampacity

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.13P: A single-phase 50-kVA,2400/240-volt,60-Hz distribution transformer has a 1-ohm equivalent leakage...

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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.

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Question 1
Given that a 400-kVA, 3-phase transformer has a 480-V primary and a 208/120-V secondary.
a) Calculate primary full-load amps
b) Calculate required feeder breaker and conductor ampacity
c) Calculate secondary full-load amps
d) Calculate required secondary breaker size and conductor ampacity

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Step 2: b) Calculate required feeder breaker and conductor ampacity

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Step 3: c) Calculate secondary full-load amps

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Step 4: d) Calculate required secondary breaker size and conductor ampacity

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