4
Three-phase System
TOPICS DISCUSSED
Advantages of a three-phase system
Three-phase windings and their connections
Active and reactive power
Measurement of power in three-phase circuits
4.1 Introduction
Generation, transmission, and distribution of electricity is done by three-phase electrical networks consisting of generators, transformers, and transmission and distribution lines forming the power system. In a three-phase system we have three independent voltages induced in the three windings of the generator. To understand the difference between a single-phase voltage and a three-phase voltage, let us consider how these voltages are generated in ac generators. We have known that EMF is induced in a coil if it cuts lines of force. In ...
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