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Chapter 12 Three Phase Circuits

Chapter 12 Three Phase Circuits. Chapter Objectives: Be familiar with different three-phase configurations and how to analyze them. Know the difference between balanced and unbalanced circuits Learn about power in a balanced three-phase system

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Chapter 12 Three Phase Circuits

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  1. Chapter 12Three Phase Circuits • Chapter Objectives: • Be familiar with different three-phase configurations and how to analyze them. • Know the difference between balanced and unbalanced circuits • Learn about power in a balanced three-phase system • Know how to analyze unbalanced three-phase systems • Be able to use PSpice to analyze three-phase circuits • Apply what is learnt to three-phase measurement and residential wiring Huseyin Bilgekul Eeng224 Circuit Theory II Department of Electrical and Electronic Engineering Eastern Mediterranean University

  2. Power in a Balanced System • The total instantaneous power in a balanced three phase system is constant.

  3. Power in a Balanced System • The important consequences of the instantenous power equation of a balanced three phase system are:

  4. Power in a Balanced System • The complex power per phase is Sp. The total complex power for all phases is S.

  5. Power in a Balanced System • The complex power per phase is Sp. The total complex power for all phases is S.

  6. Power in a Balanced System Ip Vp Vp Ip Vp VL VL VL VL Ip Vp Vp Ip Ip Ip VL Vp VL • Notice the values of Vp, VL, Ip, IL for different load connections. Y connected load. Δ connected load.

  7. Power in a Balanced System

  8. Single versus Three phase systems • Three phase systems uses lesser amount of wire than single phase systems for the same line voltage VL and same power delivered. a) Single phase system b) Three phase system • If same power loss is tolerated in both system, three-phase system use only 75% of materials of a single-phase system

  9. VL=840 V (Rms) IL Capacitors for pf Correction

  10. Unbalanced Three Phase Systems • An unbalanced system is due to unbalanced voltage sources or unbalanced load.In a unbalanced system the neutral current is NOT zero. Unbalanced three phase Y connected load. Line currents DO NOT add up to zero. In= -(Ia+ Ib+ Ic) ≠ 0

  11. Three Phase Power Measurement Two-meter method for measuring three-phase power

  12. Residential Wiring Single phase three-wire residential wiring

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