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Electrical Applications 2 by David W. Tyler

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1
Transmission and
distribution of
electrical energy
Aims:
At the end of this chapter you should be able to:
Explain why transmission is
carried
out at very high voltages.
Understand
the factors
which
affect the
design
and
arrangement
of
the transmission and distribution system.
Compare overhead lines with underground
cables.
Explain the purpose of switchgear.
Describe the equipment and layout of a small distribution sub-
station.
Describe
typical
three-phase
industrial installations.
Calculate the current distribution in, and the efficiency of radial
feeders and
ring
mains.
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