JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-requisites

Electrical Machines-I and Electrical Machines-II

Course Objectives

Objectives of this course are

• To understand the fundamentals of illumination and good lighting practices
• To understand the methods of electric heating and welding.
• To understand the concepts of electric drives and their application to electrical traction systems.

Course Outcomes

At the end of the course the student will be able to:

• Understand basic principles of electric heating and welding.
• Determine the lighting requirements for flood lighting, household and industrial needs.
• Calculate heat developed in induction furnace.
• Evaluate speed time curves for traction

UNIT - I

Electrical Heating: Advantages and methods of electric heating, resistance heating, induction heating and dielectric heating.

UNIT - II

Electric Welding: Electric welding equipment, resistance welding and arc welding, comparison between AC and DC welding. Electrolysis process: principle of electrolysis, electroplating, metal extraction and metal processing, electromagnetic stirs.

UNIT - III

Illumination: Terminology, Laws of illumination, coefficient of Utilization and depreciation, Polar curves, Photometry, integrating sphere, sources of light, fluorescent lamps, compact fluorescent lamps, LED lamps discharge lamps, mercury vapor lamps, sodium vapor lamps and neon lamps, comparison between tungsten filament lamps and fluorescent tubes. Basic principles of light control, Types and design of lighting scheme, lighting calculations, factory lighting, street lighting and flood lighting.

UNIT - IV

Electric Traction: Systems of electric traction and track electrification- DC system, single phase and 3-phase low frequency and high frequency system, composite system, kando system, comparison between AC and DC systems, problems of single-phase traction with current unbalance and voltage unbalance. Mechanics of traction movement, speed – time curves for different services, trapezoidal and quadrilateral speed – time curves, tractive effort, power, specific energy consumption, effect of varying acceleration and braking, retardation, adhesive weight and braking retardation, coefficient of adhesion.

UNIT - V

Systems of Train Lighting: special requirements of train lighting, methods of obtaining unidirectional polarity constant output- single battery system, Double battery parallel block system, coach wiring, lighting by making use of 25KV AC supply.

TEXT BOOKS:

• 1. H. Partab: Modern Electric Traction, Dhanpat Rai & Co, 2007.
• 2. E. Openshaw Taylor: Utilization of Electric Energy, Orient Longman, 2010.

REFERENCE BOOKS:

• 1. H. Partab: Art & Science of Utilization of Electric Energy, Dhanpat Rai & Sons, 1998.
• 2. N.V. Suryanarayana: Utilisation of Electrical power including Electric drives and Electric Traction, New Age Publishers, 1997.