Transformers

5

Challenges and Strategies in Transformer Design

S.V. Kulkarni

CONTENTS

5.1    Introduction

5.2    Magnetic Circuit

5.2.1    Building Factor

5.2.2    Types of Core Construction

5.2.3    Overexcitation Conditions

5.2.4    Core Temperature Rise

5.3    Windings

5.3.1    Choice of Winding Conductor

5.3.2    Eddy Loss Evaluation and Optimization

5.3.3    Winding Temperature Rise

5.3.4    Types of Windings

5.4    Insulation

5.4.1    Design Insulation Level

5.4.2    Design of Oil Ducts

5.4.3    Design of End Insulation

5.4.4    Design of Internal Insulation

5.4.5    Design of Lead Clearances

5.5    Stray Loss Control

5.5.1    Factors Affecting Stray Losses

5.5.1.1    Type of Surface Excitation

5.5.1.2    Material Properties

5.5.2    Stray Loss Components ...