2. Introduction
Transformer is the main reason to transmit and
distribute power in AC. Transformer is a device
which works on the principle of mutual induction.
3. It is based on principle of
MUTUAL INDUCTION.
According to which an e.m.f.
is induced in a coil when
current in the neighboring
coil changes.
4. Principle of transformer is it convert high voltage (low current) into
low voltage (high current). In ideal transformer, input power is
equal to out power. In transformer the relation between EMF and
current is inversely proportional and EMF and number of turns is
directly proportional to each other. The ratio of Es/Ep= Ns/Np is
called turns ratio or transformer ratio. Then there are two types of
transformer, step-up and step-down transformer.
Transformer is the main reason to transmit
and distribute power in AC.
5. The ratio is called as turn ratio or transformer ratio.
In idea transformer
I/P power = O/P Power
7. Applications
There are wide applications of transformers such as,
step up (increases) or Step down (Decreases) the level of voltage in other
words increases or decreases the level of current, while power almost be
same,
Welding Machine
X-ray tube
mobile charging
To transform electric current through metallic cables
8. Applications
It can increases or decreases the value of L, C or R in an AC circuit. This
can act as impedance transferring device
It can isolate two circuit electrically
To prevent DC from passing from one circuit to the other
Step-down level of voltage at single phase 11KV to 220 V, Three phase
11KV to 440 V
9. Applications
The current transformer Np/Ns and Potential transformer Ns/Np are used
in industry and power system
It used for impedance matching
Impedance transformer ratio=(Ns/Np)2
10. Power Losses In Transformer
Iron losses
Copper losses
Eddy current losses
Hysteresis losses
Heat losses I2R
