What is Transformer? | Transformer means transform something one to another. It is a static device. Transfer the alternating current one circuit to another by electromagnetic induction. It is used for voltage step-up or step-down.
PRINCIPLE OF TRANSFORMER:-
The transformer is based on two principles: 1st, that an electric current can produce a
magnetic field (electromagnetism) and 2nd, that a changing magnetic field within a
coil of wire induces a voltage across the ends of the coil(electromagnetic
induction). When the primary coil Charging by the current, changes the magnetic flux that is
developed. The changing magnetic flux induces a voltage in the secondary coil. The two
circuits are electrically isolated but magnetically linked through a low reluctance path. If
one coil is connected to a.c supply, an a.c is setup in both of these circuits. This helps to
transfer the voltage from one side to another.
What Is Transformer Core:-
It may be of various shape i.e. core, shell. It is made of cold-rolled-grain-oriented
Silicon steel of varnish insulation on the lamination. The core is laminated to reduce the
core loss. The lamination are made in steps &try to give circular cross section. Bolts 7
nuts secure the lamination. The core is placed at the bottom of the tank. The tanks are
constructed from sheet steel for small tank & boiler sheet for large tank. There are
thermometer pockets, radiator tubes for increasing cooling surfaces. A 3-phase
transformer has six separate winding, three primary & three secondary wound iron cores.
Enamelled copper with insulation is used for winding. Insulated papers are used for
inter-layer insulation.
What Is Transformer Oil:-
The tank is filled with transformer oil, and sealed. It is just a mineral oil refining
from crude petroleum.
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