ELECTRIC LOCOMOTIVE SHED

1. TECHNICAL TRAINING REPORT ON
ELECTRIC LOCOMOTIVE SHED AT
SOUTH EASTERN RAILWAYS,
SANTRAGACHI
PRESENTED BY
AARTI OJHA
(122604001002)
BCETW, EE 4th YEAR

2. •The ISO-9001-2008 certified
South Eastern Railways Electric
Loco Shed situated in
SANTRAGACHI.
•It is a solo loco shed in Kharagpur
Division that maintains the WAP-4
locomotives .
•The main objective of this loco
shed is to inspect and maintain the
locos that operate throughout the
year.

4. An Electric Locomotive is a
locomotive powered by
electricity
from overhead lines or on-board
energy storage such as battery
or
fuel cell.
WAP-4 stands for :-
•W = Wide gauge
(1.66m)
•A = AC Supply(25 KV)
•P = Passenger

5. TYPE AND ORIGIN
POWER TYPE : ELECTRIC
BUILDER : CHITTARANJAN
LOCOMOTIVES WORK, W.B.,
INDIA
BUILD DATA : 1990 TILL DATE
TOTAL PRODUCED : 698

6.  AAR WHEEL AAR : C-C
 UIC CLASSIFICATION : Co-Co
 GUAGE : 1.676 mm
 BOGIES : Co-Co flexible mark/ cast bogies; primary and
secondary wheel springs
WHEEL DIAMETER : New = 1,092 mm ( 3 ft 7”)
Half worn = 1,055 mm ( 3 ft 5.5 “)
Full worn = 1,016 mm ( 3 ft 4”)

7.  LENGTH : 18.794 m
 WIDTH : 3.179 m
 HEIGHT : 4.323 m
 LOCOMOTIVE WEIGHT : 1,12,800 kgs
 ELECTRIC SYSTEM : 25 kv / 50 hz AC overhead
 CURRENT COLLECTION METHOD : Pantograph
 TRACTION MOTORS : Hitachi HST 5250

8.  MAXIMUM SPEED : Service 140 km/hr
Test Run 180 km/hr
 PERFORMANCE OUTPUT : Maximum- 5350 hp
Continuous – 5050 hp
 LOCOMOTIVES BRAKES : Air/ Hand brakes
 TRAIN BRAKES : Air

9. 1. E-3 SECTION
2. E-4 SECTION
3. E-5 SECTION

11. E-3 SECTION
This section is
responsible for the
inspection and the
overhauling of the
traction motors that
drives the
locomotives

12. LET US
SEE WHAT
ARE
TRACTION
MOTORS...

13.  It is one of the most important equipment of electric
motor.
 A 6 pole DC series wound motor with commutating
poles
 They are used for the propulsion of the
vehicles.
 Locomotives have 6 axis. Each axis carry a single
traction motor which is connected to wheel by direct
spur gear meshing , these motor drive locomotives by
taking current from the overhead lines through
PANTOGRAPH.
 Ventilation system for these motors are forced and air
is supplied from separate motor blower to cool these
traction motors.

14. RATINGS CONTINUOUS ONE
HOUR
MAX
VALUE
VOLTAGE 750 V 750 V 900 V
CURRENT 900 A 960A 1300 A
SPEED
(RPM)
895 RPM 877
RPM
2150
RPM
POWER 630 KW 670
KW
____

15.  Motor is mounted in the
bogie frame supported
partially by the axle
which it drive and
partially by the bogie
frame.
 The motor case is
provided with a "nose"
which is rested on a
bracket fixed to the
frame of the bogie.

16. WHEEL:
 Wheels are manufactured of
cast steel.
 Railway wheels sit on the rails
without guidance.
 The flanges should not touch
the rails.
 The wheel tire is coned .
 Rail head slightly curved as
shown in the diagram.

18. This section is in
charge of relays,
speedometers,
microprocessors,
battery chargers
etc.

19. SPEEDOMETERSpeedometer combines the
technology of the field proven
indicators. It gives statistics of the
speed of the locomotive along with
the ability to store journey data in a
flash memory in a single housing .
Due to small size it can easily be
installed and retrofitted in public
transports such as locomotives,
tramways, metro trains etc.
This unit is very much suitable to
work under severe environment
conditions typically encountered in
real road vehicles where accurate
high speed indication is a very crucial
factor.
Inside SPM, data is recorded in a
compact FLASH MEMORY CARD. This
compact memory card can store long
term data of the last 60 days of halt
and run.

20. The purpose of relay in electrical
circuit and fluid circuit is to check
proper flow of current and circulation
of the fluid and
also to safeguard the appliance from
getting damaged in an event of no
flow or improper flow of
current or no or improper circulation
of fluid in the circuit.
In the absence of relay there
would have been no protection of the
appliance in the concerned circuit.
RELAY
ELECTRICAL
VOLTAGE
CURRENT
MECHANICAL
CIRCULATION
SPEED
PRESSURE
TEMPERATURE
Depending upon the nature of
controlling device, relays are classified into
the following groups:

21. 1.Safety Relay – Used for the safety of the entire system.
Examples are QRSI, QLM, QE, QF, etc.
2. Protection/Sequence Relay – Used for the protection of a particular
device of the system.
Examples are Q-45, Q-46, Q-51, Q-53, Q-54, Q-100, QSIT, QFL, Q-50,
QCON, etc.
3. Time Lag Relay – Used to delay the tripping of the locomotive under
certain circumstances. For example QTD 105, QTD 106.
4. Signalling Relay – Used to indicate the proper functioning of particular
devices in the locomotive. For example QV60, QV61, QV62, QV63, etc.

22. 1.RELAYS USED IN LOCOS 2.RELAY TEST BENCH IN LOCO SHED
3. RELAY TEST UNIT IN THE LOCO SHED

23. MICROPROCESSORS....
BUT WAIT!
YOU PEOPLE MUST BE THINKING
WHAT IS THE USE OF
MICROPROCESSOR
IN AN ELECTRIC LOCO?
LET US HAVE A LOOK AT IT...

24. ANOTHER MAJOR OBJECTIVE IS TO
REPLACE SOME EXISTING RELAYS AND
IT’S CORRESPONDING INTERLOCKING
LOGIC WITH THE SOFTWARE TO
REDUCE THE COST AND COMPLEXITY
OF THE WIRING AND TO ADD
CERTAIN DIAGNOSTIC FEATURE FOR
BETTER MAINTAINANCE OF THE LOCO
IT ACTS AS THE HEART OF THE
SYSTEM
THE MAIN OBJECTIVE IS TO PRIMARILY
LOCATE THE FAULTS FOR THE LOCO’S
CORRECT MAINTAINANCE

25. THAT
WAS
ALL WE
HAD IN
E-4
SECTIO
N!
LET’S MOVE AHEAD AND HAVE A LOOK AT
E-5 SECTION...

26. This section
inspects and
maintains the
Transformer,
Graduator(GR)
and SMGR.

27. FRONT VIEW OF
AN ELECTRIC LOCO
LOWER FRONT VIEW
OF AN ELECTRIC LOCO

28. FURTHER WE MOVED AHEAD TO THE DRIVER’S
CABIN WHERE WE EXPLORED THE FOLLOWING
SPEEDOMETER
VOLTMETER AND AMMETER
SIGNAL LAMP BOX
TRACTION
AND BRAKING
MPJ
AIR RESEVOIR/
PENTO RESERVOIR
BRAKE PIPE
AIR FLOW INDICATOR
BRAKE CYLINDER

29. The TRANSFORMER used in loco
is an autotransformer which is an
electrical transformer with only
one winding
“AUTO” prefix refers to the
coil acting on itself and not on
any kind of automatic
mechanism.
In autotransformer, portions
of same windings act as both the
primary and secondary sides of
transformer.

30. NOW ONE QUESTION
MIGHT ARISE IN YOUR
MIND THAT WHY DO WE
USE AUTOTRANSFORMER IN
ELECTRIC LOCOMOTIVE
INSTEAD
OF USING ANY OTHER
TRANSFORMER?

32. • Motor for silicon
rectifier coolingMVSI
• Motor for silicon
rectifierMVSL
• Motor for
cooling
transformer oil
MVRH
FURTHER IN E-5 SECTION WE EVEN SAW
MANY AUXILLARY MOTORS. LET US LEARN
ABOUT IT ONE BY ONE:--
• Motor used for cooling
the traction motors
MVMT
• Motors in the loco that takes
single phase and supplies 3
phase to the loco
ARNO
• Motor used for the
dynamic braking of the
loco
MVRL

33. 1. ARNO 2. MOTOR ALTERNATOR 3. AIR COMPRESSOR
4. MVSL 5. MVMT

34. THE ARRANGMENT
WITH THE HELP OF
WHICH THE DRIVER
OF THE LOCO
REVERSES
THE LOCO ON
TRACKS.

35. IT IS AN
ARRANGEMENT
OF RESISTENCE
AND
CAPACITENCE TO
PREVENT
DAMPING IN AN
ELECTRIC LOCO.

36. SMGR is a motor that drives the loco. It contains 4 cylinders that contains pistons driving
a common crank shaft. Depending upon the sequence under which the compressed air
enters the cylinder and the motor runs in every direction required. The SMGR is driven by air
operated pistons and it has high inertia. This ensures that the rotation is highly accurate and
does not overshoot.

37. For collecting power from 25 KV
AC contact wire pantograph are
mounted on the roof of the traction
vehicles. They are provided with steel
stripes for current collection.
The raising and lowering of pantograph
is by means of pneumatically operated
servomotor. Used for suitable operation
up to 140 km/hr.

39. Through the roof bars
via pantograph
AC supply is fed
to the transformer
which in turn steps
down the voltage and
feds it to
Rectifier changes AC to DC
and is fed to SL
pulsating DC to smooth DC
(DC-DC)and feds it to

40. PANTOGRAPH
TRANSFORMER
RECTIFIER
SOOTHING REACTORSTRACTION MOTORSLOCO MOVES