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Electrical Applications 2 by David W. Tyler

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5 Transformers
Aims:
At the end of this chapter you should be able to:
Sketch the types of cores and windings found in transformers.
State an area of use for each of the following types of transformer:
(i)
single-phase double-wound, (ii) three-phase,
(Hi)
auto, (iv) cur-
rent, (v) potential.
Explain how instrument transformers are
used.
Faraday discovered that whenever a change in magnetic flux is
associated with a coil of wire a voltage is induced in that coil. The
value of the induced
e.m.f.
is proportional to the number of turns
and to the rate of change of magnetic flux in webers per second.
άΦ
Λ
e = N
—r-
volts
at
Alternating voltages of any desired value may be obtained by using