文档介绍：First Edition, 2012
ISBN 978-81-323-4395-0
© All rights reserved.
Published by:
White Word Publications
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Ansari Road, Darya Ganj,
Delhi - 110002
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Table of Contents
Chapter 1 - Railway Electrification System
Chapter 2 - Traction work
Chapter 3 - Railway Electric Traction
Chapter 4 - Electric otive
Chapter 5 - Pantograph (Rail)
Chapter 6 - Electric Multiple Unit
Chapter 7 - Trolley Pole
Chapter 8 - Third Rail
Chapter 9 - Overhead Lines
Chapter 10 - Ground-Level Power Supply
Chapter 1
Railway Electrification System
Electric otives under the wires in Sweden
Overhead wire and catenary in Bridgeport, Connecticut, United States
A railway electrification system supplies electrical energy to railway otives and
multiple units so that they can operate without having an on-board prime mover. There
are several different electrification systems in use throughout the world. Railway
electrification has many advantages but requires significant capital expenditure for
installation.
Characteristics of electric traction
The main advantage of electric traction is a higher power-to-weight ratio than forms of
traction such as diesel or steam that generate power on board. Electricity enables faster
acceleration and higher tractive effort on steep gradients. On otives equipped with
regenerative brakes, descending gradients require very little use of air brakes as the
otive's traction motors e generators sending current back into the supply
system and/or on-board resistors, which convert the excess energy to heat.
Other advantages include the lack of exhaust fumes at point of use, less noise and lower
maintenance requirements of the traction units. Given sufficient traffic density, electric
trains produce fewer c