Transformers
TRANSFORMER THEORY
TRANSFORMER THEORY
Transformers are used extensively for AC power transmissions and for various
control and indication circuits. Knowledge of the basic theory of how these
components operate is necessary to understand the role transformers play in
today’s nuclear facilities.
EO 1.1
DEFINE the following terms as they pertain to
transformers:
a.
Mutual induction
b.
Turns ratio
c.
Impedance ratio
d.
Efficiency
EO 1.2
DESCRIBE the differences between a wye-connected
and delta-connected transformer.
EO 1.3
Given the type of connection and turns ratios for the
primary and secondary of a transformer, CALCULATE
voltage, current, and power for each of the following
types:
a.
D - D
b.
D - Y
c.
Y - D
d.
Y - Y
Mutual Induction
If flux lines from the expanding and contracting magnetic field of one coil cut the windings of
another nearby coil, a voltage will be induced in that coil. The inducing of an EMF in a coil by
magnetic flux lines generated in another coil is called mutual induction. The amount of
electromotive force (EMF) that is induced depends on the relative positions of the two coils.
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