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Introduction to Three-phase Circuits

1 Introduction to Three-phase CircuitsBalanced 3-phase systemsUnbalanced 3-phase systems2 Introduction to 3-phase systemsSingle-phase two-wire system : Single source connected to a load using two-wire systemSingle-phase three-wire system : Two sources connected to two loads using three-wire system Sources have EQUAL magnitude and are IN PHASE3 Balanced Two-phase three-wire system : Two sources connected to two loads using three-wire system Sources have EQUAL frequency but DIFFFERENT phasesCircuit or system in which AC sources operate at the same frequency but different phases are known as Phase system : A generator consists of two coilsplaced perpendicular to each other The voltage generated by one lags the other by 90 .4 Balanced Three-phase four-wire system : Three sources connected to 3 loads using four-wire system Sources have EQUAL frequency but DIFFFERENT phasesThree Phase system : A generator consists of three coilsplaced 120 apart.

four-wire system • Sources have EQUAL frequency but DIFFFERENT phases Three Phase System: • A generator consists of three coils placed 120 apart. • The voltage generated are equal in magnitude but, out of phase by 120 . • Three phase is the most economical polyphase system.

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