Page 528 - Basic Electrical Engineering

6

Transformers

TOPICS DISCUSSED

Applications of transformers
Basic principle of transformers
Constructional details
EMF equation
Transformer on no load and on load
Phasor diagrams
Circuit parameters
Equivalent circuit
Losses and efficiency
Regulation
All-day efficiency
Basic tests on transformers

6.1 INTRODUCTION

Electricity is generated in power houses. Power houses are situated at distant

places wherefrom the generated power is to be taken to industries,
commercial centres, residential colonies, and villages. The generators used in

power houses generate electricity at a particular voltage. Normally the
generation voltage is 11,000 V or 11 kV. Electricity is transmitted from the

place of generation to the place of its use through electrical transmission lines
which are taken overhead using transmission towers. The voltage level of the
power to be transmitted is raised to higher values, say from 11 kV to 220 kV