it contain transformer basic beginer of electrical being helpful that gets idea about transformer worki

2. I. The electrical energy is
generated and transmitted at
an extremely high voltage.
II. The voltage is to be then
reduced to a lower for its
domestic and industrial use.
III.Thus it is possible to voltage
reduce the voltage level using
transformer.

3. DEFINATION
 What is transformer ?
 The transformer is electrical device that
transfer electrical energy from one electrical
circuit to another electrical circuit through
magnetic field and without change in
frequency
 It is static device.
 Input and output of transformer are both A.C

4. Transformer type
Depending upon core and winding arrangment
1. Shell type 2. Core type

5. CONSTRUCTION
 It consist two highly inductive coil wound on
core
 Winding connected to supply is called primary
winding and other is called secondary

 In between both winding
there is no physical
connection

6. core
Core
 The material used for
transformer core is
generally silicon steel
 Core is in form of stack of
laminated thin steel sheets
 Reluctance of core is should
be low

8. WORKING

9. FARADAY LAW
 Whenever the magnetic lines of force linking with a coil
or conductor an emf get induce in the coil or conductor
 Induced emf is directly proportional to rate of change
of flux
 e α dϕ/dt
e =N dϕ/dt

10. WORKING
 primary winding
connected to the
single phase A.C supply A.C current start flowing through it
 primary current produce an alternating flux in core
that links with secondary coil through core
 Varying flux induce emf in secondary coil according to
faraday law of EMI

11. EMF EQUATION
 As same A.C voltage
apply at primary coil
flux changes sinusoidal
manner
ϕ=ϕm sin(ωt)------(1)
 Induced emf given by
Faraday law
e = -N dϕ/dt
e = -N d/dt ϕmsin(ωt)
 emf induced per turn (N=1)
e = -ϕm.ω.cos(ωt)

12.  For maximum value voltage per turn substitute
cos(ωt)=±1
emax = ωϕm
=2пf.ϕm
 To obtain rms value
=√2 пf.ϕm =4.44 f.ϕm
 Let E1 is induced voltage in primary winding with N1
turns
E1= 4.44 f.ϕm N1
 Let E2 is induced voltage in secondary winding
with N2 turns
E2= 4.44 f.ϕm N2