This document provides an overview of electric locomotives, including their main components and systems. It discusses how electric locomotives are classified and divided based on their power source. The key systems of an electric locomotive are then described, including the transmission system consisting of the pantograph and circuit breaker, the transformer, rectifier, DC link, and Arno converter. It also outlines the main traction components like the traction motors. In conclusion, it notes the advantages of electric locomotives in terms of efficiency and potential for renewable power sources.

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2. CONTENTS
• Introduction
• Electric Locomotive Divisions
• Transmission System
• Traction System
• Parts of Locomotive
• Advantages
• Conclusion
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3. •An electric locomotive is a locomotive powered
by electricity from overhead lines, a third rail or
on-board energy storage such as a battery or fuel
cell.
•Electric locomotive is classified into two
categories. The first type of vehicle receives
power from a distribution network while the
second type of vehicle generates own power. In
the second category comes a diesel engine electric
drive.
INTRODUCTION
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4. DIVISION OF ELECTRIC LOCOMOTIVE
Electric Locomotive
Transmission Traction System Internal Working
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5. TRANSMISSION SYSTEM
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6. PANTOGRAPH
Pantograph is a current
collecting device which
is mounted on both ends
of locomotive roof on
insulator and collect the
current from Over Head
Extension and supply it
to power system of
locomotive at various
speed and different
climate/wind condition
smoothly.
TRACTION
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7. CIRCUIT BREAKER
The high voltage
circuit breaker is
special type of electro
pneumatic contactor
mounted on the roof of
the loco. The electrical
equipment of the loco
is connected to or
disconnected from the
OHE by means of the
circuit breaker.
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8. BLOCK DIAGRAM OF LOCOMOTIVE
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9. TRANSFORMER
• An essential
requirement for
locomotives and trains
using AC power, where
the line voltage has to
be stepped down before
use on the train.
• Normally transformers
used are of rating 5600
kva to 7200 kva
PARTS OF ELECTRIC LOCOMOTIVE
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10. RECTIFIER
•A rectifier consist of thyristors and
diodes which is used to convert AC to
DC.
•Instead of conventional bridge
rectifiers thyristors are used for smooth
operation at power level.
•A modern locomotive usually have at
least two, a "Main Rectifier" for the
power circuits and one or more for the
auxiliary circuits.
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11. DC LINK
•Used on modern electronic
power systems between the
single phase rectifier and the
3-phase inverter.
• It is easier to convert the
single phase AC from the
overhead line to the 3-phase
required for the motors by
rectifying it to DC and then
inverting the DC to 3-phase
AC.
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12. ARNO CONVERTOR
• Arno converter is a device
which convert single phase
AC in to three phase AC.
• The three phase supply is
needed for the three phase
induction motors which are
used in blowers, exhausters
an oil pumps.
• Arno converter is rotating
device.
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13. TRACTION MOTORS
•Direct-current motors with series field
windings were the oldest type of traction
motors.
•These provided a speed-torque characteristic
useful for propulsion, providing high torque at
lower speeds for acceleration of the vehicle, and
declining torque as speed increased.
•By arranging the field winding with multiple
taps, the speed characteristic could be varied,
allowing relatively smooth operator control of
acceleration. A further measure of control was
provided by using pairs of motors on a vehicle;
for slow operation or heavy loads, two motors
could be run in series off the direct current
supply.
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14. • A variant of the DC system was the AC operated series
motor, which is essentially the same device but operated
on alternating current.
• Since both the armature and field current reverse at the
same time, the behavior of the motor is similar to that
when energized with direct current.
• To achieve better operating conditions, AC railways were
often supplied with current at a lower frequency than the
commercial supply used for general lighting and power;
special traction current power stations were used,
or rotary converters used to convert 50 or 60 Hz
commercial power to the 16 2/3 Hz frequency used for
AC traction motors.
Continued…
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15. ADVANTAGES
 Electricity is used to eliminate smoke and take advantage of the high
efficiency of electric motors; however, the cost of railway electrification
means that usually only heavily-used lines can be electrified.
 The power for electric locomotives can come from clean and/or renewable
sources, including geothermal power, hydroelectric power, nuclear
power, solar power and wind turbines.
 Electric locomotives benefit from the high efficiency of electric motors,
often above 90%. Additional efficiency can be gained from regenerative
braking, which allows kinetic energy to be recovered during braking to put
some power back on the line. Newer electric locomotives use AC motor-
inverter drive systems that provide for regenerative braking.
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16. CONCLUSION
 Finally, I can conclude that electric locomotives are playing a
vital role in railway system till now.
 The use of electric locomotives primarily came in order to
reduce problems of smoke pollution.
 Though electric locomotives are more efficient than steam and
diesel locomotives, electrification of railway lines is
expensive. For this reason, electric locomotives are used
mainly for busy passenger lines.
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17. • http://www2.hesston.edu/Physics/electricloco/eleclocop.html
(12/4/15)
• http://24coaches.com/locomotive-working-india/(12/4/15)
• http://www.ehow.com/how-does_4898637_electric-train-
work.html(10/4/15)
• http://science.howstuffworks.com/transport/engines-
equipment/electric locomotive.htm(08/4/15)
• http://physics.stackexchange.com/questions/150033/how-
does-this-simple-electric-train-work(10/4/15)
REFERENCES
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