Introduction of Transformer

INTRODUCTION

A transformer is a static electrical device, which does not having any moving parts. It transfers electric power from one circuit to another circuit without changing the frequency. It can raise or lower the voltage in a circuit with corresponding decrease or increase in current. It works on the principle of mutual induction, between two circuits linked by a common magnetic flux. In other words, it consist of two inductive coils which are electrically separated but magnetically linked (i.e.,) two windings are insulated from each other and wound on a common core made up of magnetic material, with less reluctance, which is shown in Figure 1.1.

If one coil is connected to a source of alternating voltage, an alternating flux is setup in the laminated that winding is called primary winding. The flux created in the core will cuts the secondary winding and primary as well. It produces mutually induced emf (according to Faraday's law).

In brief, transformer is a device that:

i. Transfer electric power from one circuit to another.

ii. It does so without a change of frequency.

iii. It accomplishes this by electromagnetic induction and

iv. The two circuits are in mutual inductive influence of each other.