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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