After studying this unit, you should be able to:
Discuss the differences between three-phase and
Discuss the characteristics of delta and wye connections.
Compute voltage and current values for delta
and wye circuits.
Connect delta and wye circuits and make measurements
with measuring instruments.
Most of the electrical power generated in the world today
is three-phase. Three-phase power was first conceived by
Nikola Tesla. In the early days of electric power generation,
Tesla not only led the battle concerning whether the nation
should be powered with low-voltage direct current or
high-voltage alternating current, but he also proved that
three-phase power was the most efficient way that electricity
could be produced, transmitted, and consumed.