Three-phase systems differ from single-phase systems in that they use a set of three voltages instead of one. Three-phase systems are used for the generation and transmission of bulk electric power. To get single-phase ac from a three-phase system, we simply tap off one of its phases. Three-phase systems may be balanced or unbalanced. If a system is balanced, it can be analyzed by considering just one of its phases. Since most systems operate close to balance, many practical problems can be dealt with by assuming balance. Three-phase systems posses economic and operating advantages over single-phase systems.

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