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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.

• Three phase is the most economical polyphase system. AC Generation • Three things must be present in order to produce electrical current: a) Magnetic field b) Conductor c) Relative motion • Conductor cuts lines of magnetic flux, a voltage is induced in the conductor

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