Transformer Construction:
The simple element of a transformer consists of two coils having mutual inductance and a
laminated steel core. The two coils are insulated from each other with steel core. Other
necessary parts are : some suitable container for assembled core windings from its container:
Suitable bushings (either of porcelain, oil- filled or capacitor type) for insulating and bringing
out the terminals from the tank. Core is constructed of transformer sheet steel laminations,
assembled to provide a continuous magnetic path with a minimum of air gap included. Steel
used is of high silicon content, sometimes heat treated to produce a high permeability and low
hysterisis loss at the usual operating flux-densities. Lamination is of varnish or an oxide
layer, which reduces eddy current loss. Thickness of lamination varies with frequency
inversely.
Transformers are of 2 general types distinguished by the manner in which primary and
secondary coils are placed around the laminated core :
1. Core Type – winding surrounded a considerable portion of the core.
2. Shell Type – core surrounds a considerable portion of windings.
Working principle :
A transformer is a static piece of apparatus by means of which electric power in one circuit is
transformed into electric power of the same frequency in other circuit. It can raise or lower
the voltage in a circuit but with a corresponding decrease or increase in current. The physical
basis of transformer is mutual induction between two circuits linked by a common magnetic
flux. It consists of two inductive coils which are electrically and magnetically linked through
a path of low reluctance. The 2 coils possess high mutual inductance. If one coil is connected
to a source of alternating voltage , an alternating flux is set-up in laminated core, most of
which is linked with other coil in which it produces mutually induced emf (according to
Faraday’s law of EMI e = MdI/dt). If the second coil circuit is closed, a current flows in it
and so electric energy is transferred (entirely magnetically) from the first coil to the second
coil. The first coil in which electric energy is fed from A.C. supply mains is called primary
winding and other from which energy is drawn out, is called secondary winding
gregorymasila answered the question on February 22, 2018 at 16:44
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