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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. The voltage generated are equal in magnitude but, out of phase by 120.

Introduction to 3-phase systems Single-phase two-wire system: • Single source connected to a load using two-wire system ... Three separate windings or coils with terminals a-a’, b-b’, and c-c’ are physically placed 120 apart around the stator. As the rotor rotates, its magnetic field cuts the flux from the three ...

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