The Basics

This chapter addresses the basic theories and conventions associated with three-phase alternating current (AC) electrical power systems. Some of the theories contained in the chapter and throughout the book are not commonly presented and the content should enhance the reader’s understanding of three-phase power. Although the main focus of this book is generation, theory is theory, and much of the material presented can be directly applied to the transmission and distribution of electrical power as well.

1.1  Three-Phase History

In 1888, Nikola Tesla (Serbian) delivered a lecture on the advantages of polyphase AC power. The first transmission of three-phase power occurred in Germany during 1891 at 25,000 volts or 25 kilovolts ...

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