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BALANCED THREE-PHASE CIRCUITS

BALANCED THREE-PHASE CIRCUITSThe voltages in the THREE-PHASE power system are produced by asynchronous generator (Chapter 4). In a BALANCED system, each of the threeinstantaneous voltages have equal amplitudes but are separated from theother voltages by a phase angle of 120. The three voltages (or phases ) areotypically labeled a, b and c. The common reference point for the threephase voltages is designated as the neutral connection and is labeled as n. We may define either a positive phase sequence (abc) or a negative phaseanbncnsequence (acb) as shown below. The three sources V, V and V aredesignated as the line-to-neutral voltages in the THREE-PHASE VOLTAGESAn alternative way of defining the voltages in a BALANCED three-phasesystem is to define the voltage differences between the phases . Thesevoltages are designated as line-to-line voltages.

Delta Source - Source Current and Line Current Relationship The delta source line currents (IaA, IbB, IcC) are related to the corresponding source currents (I ba, Icb, Iac) according to Kirchoff’s current law. Assuming a balanced three-phase system with source currents defined by the resulting phasor diagram relating the source and line ...

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