
CHAPTER OBJECTIVES
• To define and explain balanced and unbal-
anced three-phase systems and to extend the
concepts of active power, reactive power and
complex power to such systems.
• To develop and employ relations between line
and phase quantities in Y-connected and
Δ-connected three-phase circuits.
• To emphasise constraints on line quantities
in three-phase three-wire and four-wire
systems.
• To develop a systematic procedure to analyse
sinusoidal steady-state in three-phase
balanced circuits using Y-equivalent and
single-phase equivalent circuits.
• To show how to use phasors, phasor
equivalent circuits and phasor diagrams for
solving three-phase ...