Abstract
This chapter shows that the genesis of three-phase lines and systems and provides information on how to make computations with these systems in the particularly important (and easy) case of balanced three-phase systems. Important advantage of three-phase systems is the fact that, differently from single-phase transmission, the instantaneous power delivered by three-phase generators and transferred to three-phase loads is constant. The three load impedances discussed were connected between the line wires, forming a triangle. The chapter describes the single-phase equivalent of the three-phase circuit and power in three-phase systems. It discusses the single-phase feeding from three-phase systems. Finally, the chapter ends with short biography of Tesla.
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