Lecture on Transformer By D. M. Parshuramkar 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.
Principle of operation
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.
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.
The ratio is called as turn ratio or transformer ratio. In idea transformer I/P power = O/P Power Put this values in equation III, we get
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
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
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
Power Losses In Transformer
Iron losses
Copper losses
Eddy current losses
Hysteresis losses
Heat losses I2R
Transformer Efficiency Transformer efficiency is given as:
Thank You
