No new concepts are required for the analysis of three-phase circuits under sinusoidal
steady-state conditions. It requires only an application of all the concepts we developed in
the previous two chapters. But before we take up the analysis of three-phase circuits, let us
see why Electrical Engineers thought up three-phase system in the first place.
9.1 THREE-PHASE SYSTEM VERSUS SINGLE-PHASE SYSTEM
Industrial heaters are used for a variety of heating applications in various material
processing industries. Typically, heater boxes that contain heating elements powered by AC
supply transfer the heat developed to a gaseous (usually air) or liquid medium ...
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