TABLE OF CONTENTS A. White
The tremendous development and progress in the transmission and distribution of electrical energy during the past 100 years may not have been possible but for the capability of linking the generator, the transmission line, the secondary distribution system and a great variety of loads, each part operating at its most suitable voltage [1]. This linking of systems at different voltages has relied on a simple, convenient and reliable device - the power transformer. This unique ability of the transformer to adapt the voltage to the individual requirements of the different parts of the system is derived from the simple fact that it is possible to couple the primary and secondary windings of the transformer in such a way that their turns ratio will determine very closely their voltage ratio as well as the inverse of their current ratio, resulting in the output and input voltamperes and the output and input energies being approximately equal.
A transformer essentially comprises at least two conducting coils having mutual inductance. The primary is the winding which receives electric power and the secondary is the one which may deliver that power as shown in Figure 13.1. The coils are usually wound on a core of laminated magnetic material and the transformer is then known as an iron-cored transformer. The modern iron-cored transformer has so nearly approached perfection that for many calculations it may be considered a perfect transforming device. In the simplest form of the theory of the...
