At the end of this chapter you should be able to:
Explain why transmission is
out at very high voltages.
the transmission and distribution system.
Compare overhead lines with underground
Explain the purpose of switchgear.
Describe the equipment and layout of a small distribution sub-
Calculate the current distribution in, and the efficiency of radial
SYNCHRONOUS Virtually all the generation of electrical energy throughout the
GENERATORS world is done using three-phase synchronous generators. Almost
invariably the synchronous generator has its magnetic field pro-
duced electrically by passing direct current through a winding on