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# Chapter 12 Three Phase Circuits - PowerPoint PPT Presentation

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 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

• The total instantaneous power in a balanced three phase system is constant.

• The important consequences of the instantenous power equation of a balanced three phase system are:

• The complex power per phase is Sp. The total complex power for all phases is S.

• The complex power per phase is Sp. The total complex power for all phases is S.

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.

• 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

VL=840 V (Rms)

IL

Capacitors for pf Correction

• 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

Two-meter method for measuring three-phase power

Single phase three-wire residential wiring