An electric locomotive is powered by electricity from overhead lines, third rails, or onboard energy storage. There are two main types of traction systems - non-electric and electric. Electric traction systems use electric motors powered by drawing electricity from utilities, diesel generators, or batteries to produce movement. The main parts of an AC electric locomotive include the pantograph, circuit breaker, transformer, rectifier, main inverter, and battery.

1. Electric locomotive
PREPARED BY
SAIFUL ISLAM
ID: 1812EEE00146

2. INTRODUCTION
 An electric
locomotive is a
locomotive
powered by
electricity from
overhead lines,1
a third rail or on-
board energy
storage such as a
battery or fuel
cell.

3. TRACTION SYSTEMS
 A system which causes the propulsion of vehicle in which tractive or
driving force is obtained from various devices such as diesel engine
drives, steam engine drives, electric motors, etc. is called as traction
system.

4. Cont..
The traction system can be classified as
non-electric and electric traction systems.
Non-electric traction system .
Electric traction system.

5. Non-Electric Traction System
 A traction system that doesn't
use electrical energy for the
movement of vehicle at any
stage is referred as non-
electric traction system.
 Example NETS The steam
locomotive system uses the
superheated steam to produce
mechanical energy for the
movement of vehicle.

6. Electric traction system
 In this, electrical
motors are used for
producing the vehicle
movement and are
powered by drawing
electricity from utilities
or diesel generators or
batteries

7. Supply Systems of Electric Traction
 DC traction system
 Single phase AC traction system
 Three phase AC traction system
 Composite traction system

8. . DC Traction System
 1In this traction system, electrical motors are operates on DC
supply to produce necessary movement of the vehicle.
 Mostly DC series motors are used in this system.
 DC compound motors are used where regenerative braking is
required.
 Only one conductor or rail is required to šupply power to
locomotive while track rails are used as return conductors in
majority of cases.
 Cont.... This single phase low voltage is then converted
into DC voltage using suitable converters or rectifier such
as power electronic converter, rotary converters, mercury
arc converters, etc. The DC supply is then applied to the
DC motor via suitable contact system.


9. Main Parts of AC Electric Locomotive
 Pantograph
 Circuit Breaker
 Transformer
 Rectifier
 Main Inverter
 Battery

10. Advantage of electric locomotives
 High starting torque.
 Less maintenance.
required.
 Pollution free.
 Economical operating
cost.
 Easy supply of power .
 Regenerative braking.

11. Disadvantage
 High capital cost
 Less flexibility of routes.
 Interference of
communication lines.

12. Future Scope
 In the next five years, Indian railway market will be the 3rd
largest, accounting to 10% of the global market and Metro rail
is going to be 70% of the railway market in Bangladesh.
 In Bangladesh, due to increasing population and economic
expansion, the electricity demand and supply balance is skewed.
To tackle the situation we need to develop eco- friendly cities
with more public transports. This need leads to the expansion of
Metro rail network.