Transformers

10

Functional and Component-Related Diagnostics for Power Transformers, a Basis for Successful “Transformer Life Management”

Adolf J. Kachler and Ivanka Höhlein

CONTENTS

10.1  Introduction

10.2  Objectives of Condition Assessment and TLM

10.3  Main Aging Factors

10.3.1  General Aging Aspects

10.3.2  Impact of Air/Oxygen

10.3.2.1  Aging of the Oil due to Air/Oxygen

10.3.2.2  Aging of the Solid Insulation due to Air/Oxygen

10.3.3  Impact of Moisture

10.3.3.1  Reduction of the Dielectric Strength in Oil by Moisture

10.3.3.2  Reduction of Mechanical and Dielectric Strength of Paper and Pressboard with Moisture

10.3.3.3  Accelerated Aging of Paper with Moisture

10.3.3.4  Impact of Temperature

10.3.3.5  Interaction between the Main Aging Factors ...