Simplicity in 3-phase system circuit conventions and concepts

IN THE ANALYSIS of electric circuits, certain conventions are necessary, or at least desirable, to facilitate understanding and checking. Actually, also, the formulation of basic laws depends upon the conventions used, so that in any review of the subject, both conventions and basic concepts can well be treated together. Obviously, understanding is increased and chances for error and misunderstanding are reduced if the conventions used in all areas of circuit analysis are the simplest, most logical, and most consistent. This analysis is particularly concerned with 3-phase systems.