Transformers

6

Large-Shell-Type Transformers: Aspects of Design

Xose M. López-Fernández

CONTENTS

6.1    Introduction

6.2    Core Form and Shell Form Transformers

6.3    Transformer Basic Construction

6.3.1    Different Magnetic Circuit Construction (Core Structures)

6.3.2    Core

6.3.2.1    Core Construction

6.3.3    Winding

6.4    Shell-Form-Type Transformer Construction

6.4.1    Design Concept and Requirements

6.4.2    Pancake Windings

6.5    Performance Aspects of Shell-Type Transformers

6.5.1    Leakage Magnetic Field

6.5.2    Flux Distribution around a Coil

6.5.3    Flux Distribution across a Coil

6.5.4    Magnetic Shielding

6.5.4.1    T-Beam Shielding

6.5.5    Third Component of Flux

6.5.6    Stray Losses

6.5.6.1    Calculation of Eddy-Current Losses ...