# 3000Chapter13 - phase system based on each phase having a...

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1 Chapter 13 Three-Phase Circuits

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2 Objectives Demonstrate the phase relationship among the three voltages or currents in a three-phase system. State the difference between line voltage and phase voltage and convert between them. Show how to reverse the phase sequence in a three-phase system. Show why the neutral current in a four-wire balanced three-phase system is zero.
3 Objectives Explain the differences between a three-phase wye and a three-phase delta system. Calculate power in both wye and delta three- phase systems. Discuss some of the advantages of three-phase systems over single-phase systems.

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4 13-1 Introduction to Three-Phase Theory Wye Configuration Instantaneous Waveforms Phasor Forms
5 Three-phase system using three separate voltage sources with different phase angles, connected to a common neutral.

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6 The three-phase system rearranged to show that it is a wye configuration.
7 The three instantaneous voltage waveforms for a three-

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Unformatted text preview: phase system based on each phase having a voltage of 120 V rms (peak value of about 170 V). 8 13-2 Phase Voltages and Line Voltages Phase Voltages Line Voltages Several Important Conventions 9 Phasor representation of the three phase voltages. 10 Phasor forms of the three line voltages formed from the phase voltages. 11 13-3 Three-Phase Sequencing 12 13-4 Three-Phase Wye and Delta Connections Wye Connection Delta Connection Summary of Important Relationships 13 Three-phase source connections: (a) wye and (b) delta. 14 13-5 Three-Phase Wye and Delta Load Connections 15 Three-phase balanced load configurations: (a) wye and (b) delta. 16 13-6 Three-Phase Power Calculations 17 13-7 Comparison of Power Flow in Single- and Three-Phase Systems Single-Phase Instantaneous Power Three-Phase Instantaneous Power...
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