9Three-Phase Systems

OBJECTIVES: After studying this chapter, you will be able to

  • Explain the difference and the similarity between single-phase and three-phase systems
  • Explain the advantages of three-phase systems
  • Understand why three-phase systems are more common in industry
  • Extend the relationships in single-phase AC electricity to three-phase systems
  • Understand delta and wye connections in three-phase electricity
  • Describe the relationships and differences between wye and delta connections
  • Make a distinction between balanced and unbalanced loads
  • Calculate power and power factor in three-phase electricity
  • Apply power factor correction for three-phase electricity

New terms: Balanced load, delta connection, Δ connection, inrush current, ...

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