Power Transformers 1

COURSE DESCRIPTION

This course describes how power transformers work and introduces some of the more common types of power transformers found in substations and switchyards. This course also demonstrates how to recognize and identify specific classes of power transformers by their cooling systems and discusses how cooling systems work.

COURSE GOALS

• Describe how transformers work.

• Identify common types of transformers found in substations.

• Recognize and identify specific classes of power transformers by their cooling systems.

• Describe how different types of cooling systems work.

SUBJECTS AND OBJECTIVES

Transformer Principles

• List the main components of a transformer, and discuss the function of each part.

• Explain how a transformer fulfills the three requirements for electromagnetic induction.

• Describe how a transformer’s turns ratio determines the difference between its primary and secondary voltage.

Types of Transformers

• Identify power transformers, current transformers, and potential transformers.

Cooling Systems – Part 1

• Describe the purpose of power transformer cooling systems.

• Recognize and identify a self-cooled power transformer, and describe how its cooling system works.

• Recognize and identify a self-cooled/forced-air-cooled power transformer, and describe how its cooling system works.

Cooling Systems – Part 2

• Recognize and identify a forced-oil/forced-air-cooled power transformer, and describe how the cooling system works.

• Identify and describe the functions of temperature gauges and level gauges on a power transformer.