Summer training at DLW Varanasi

1. IAMR COLLEGE
OF
ENGINEERING
Submitted To-
Mr. Ashish Kumar
Coordinator
EEE - IV Year
Submitted By-
Brijesh Kumar Yadav
EEE- IV Year
Roll No. 1136921004
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2. Summer training AT
Diesel Locomotive Works Varanasi
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3. INTRODUCTION
DLW, was founded by Late Railway Minister Mr. Lal Bahadur Shastri on 23
April 1956. It is spread in 300 acres area at Varanasi.
It is a production unit owned by Indian railways , for which it manufactures
diesel–electric locomotives and its spares parts.
 DLW rolled out its first locomotive 8 years later, on January 3, 1964. It
manufactures locomotives.
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4. CONTINUE…..
 Got its first ISO certification in 1997 and ISO-9001 and ISO-14001 in December
2002.
 At present the latest locomotive produced by DLW; i.e. WDG 5 has capacity upto
5000 HP & trying to make it 5500 HP.
 It has supplied locomotives to other countries such as Sri Lanka, Bangladesh,
Malaysia, Tanzania and Vietnam etc.
 DLW is supplying locos to PSU’s & Industries Like NTPC, COAL, INDOGULF etc.
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5. Some Facts About Diesel Electric Locomotive
 DLW’s annual production - 250 Locomotives
 Cost of one loco - 12 to 14 crore (EMD)
8 crore (Alco)
 Weight of one Loco - 121 Ton
 Fuel Consumption; At Full Load - 540 lt/hr.
Idle Load - 40 lt/hr.
 Max. Speed - 160 Km/hr.
 Dia of Wheel - 1092 mm
 Wheel to Wheel Distance - 1596.5 mm
 Length of Under Frame - 19962 mm 5

6. DIESEL ELECTRIC LOCOMOTIVE
In a diesel-electric locomotive, the diesel engine drives an electrical generator or
alternator whose output provides power to the traction motors. There is no
mechanical connection between the engine and the wheels.
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7. LOCOMOTIVE PARTS
Main Alternator
Auxiliary Alternator
Motor Blower
Rectifiers/Inverters
Electronic controls
Cab
Truck Frame
Traction Motor
Fuel Tank
Air Reservoirs
Air Compressor
Gear Box
Radiator and Radiator Fan
Turbo Charging
Sand Box
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8. CLASSIFICATION OF LOCOMOTIVES
Locos, except the older steam ones, have classification codes that identify them. This
code is of the form:
WDG5A which means “ [ gauge ][ power ][load ][ series ][ sub type ]”
THE FIRST LETTER (GAUGE)
W- Indian broad gauge
Y- meter gauge
Z- narrow gauge(2.5 ft)
N- narrow gauge (2 ft)
THE SECOND LETTER (MOTIVE POWER)
D- Diesel
C- DC electric (can run under DC traction only)
A- AC electric (can run under AC traction only)
CA- Both DC and AC (can run under both AC and DC tractions)
B- Battery electric locomotive (rare) 8

9. Continue……
THE THIRD LETTER (LOAD TYPE)
G- Goods
P- Passenger
M- Mixed traffic ; both goods and passenger
S- Used for shunting
U- Electric multiple units (E.M.U.)
R- Railcars
THE FOURTH LETTER (SERIES)
The series digit identifies the horsepower range of the locomotive.
e.g. Series letter ‘3’ means that the locomotive has power over 3000 hp but less than
4000 hp.
THE FIFTH LETTER (SUBTYPE)
an optional letter or number that indicates some smaller variations in the basic model.
e.g.: ‘A’ for 100 hp; ‘B’ for 200 hp and so on……..
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10. PRIME FEATURES OF
LOCOMOTIVES
BHP THP MODEL
1400 HP 1250 HP YDM4
2600 HP 2400 HP WDM2
3100 HP 2750 HP WDG3A
4000 HP 3939 HP WDG4
5500 HP 5300 HP WDG5
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11. TRACTION MOTOR
• Electric motor providing the primary rotational
torque of a machine, usually for conversion into
linear motion.
•DC series-wound motors, running on
approximately 600 volts.
•The availability of high-powered
semiconductors such as thyristors has now made
practical the use of much simpler, higher-
reliability AC induction motors. 11

12. DC-DC TRACTION
Earlier DC-DC transmission was used in the traction process which can be
explained with the following block diagram:
D.E.
DC
GENERATOR
4 2356 1
DC SERIES TRACTION MOTORS
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13. FAILURE OF DC-DC TRACTION
The voltage must be generated at the level (amplitude or value)
required by the load.
But in case of DC generator used in DC traction produce a
constant voltage level which can not be employed for all loads.
The machine for the DC Traction is bulky and heavy in size.
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14. AC-DC TRACTION
Then to overcome the drawbacks of DC-DC transmission, AC-DC was used
in the traction process which can be explained with the following block
diagram:
D.E.
ALTERNATO
R
RECTI
FIER
4 2356 1
DC SERIES TRACTION MOTORS
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15. FAILURE OF AC-DC TRACTION
The AC-DC Traction system failed mainly due to the disadvantages of DC
Series Motor, which are:
1. Chances of flashover.
2. Thick cable size.
3. Bulky nature.
4. Costly.
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16. MODERN TRACTION(AC-AC) SYSTEM
D.E.
ALTERNATO
R
RECTI
FIER
4 2356 1
THREE PHASE AC INDUCTION
MOTORS
TCC-1TCC-2
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17. WHY AC-AC TRACTION??
• In case of AC-DC Traction out of the BRAKING HORSE POWER
(BHP) e.g. 1400 HP only 1250 HP is used as the TRACTION POWER
(THP).
•But in case of AC-AC Traction out of 4000 BHP, 3939 HP is used as the
TRACTION POWER.
•So there is more power loss in AC-DC Traction System, which results in
its replacement with the AC-AC Traction System.
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18. WHY AC MOTORS ARE REPLACING DC
MOTORS?
 They are simpler to construct, require no mechanical contacts to work
(such as brushes) and are lighter than DC
motors for equivalent power.
They are more robust and easier to
maintain than DC motors.
 AC motors can be microprocessor controlled to a
fine degree and can regenerate current down to almost a stop whereas DC
regeneration fades quickly at low speeds.
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19. ELECTRIC TRANSMISSION
The diesel-electric locomotive uses electric transmission, where traction
motors are provided on the axles to give the final drive.
These motors were traditionally DC but the development of modern power
and control electronics has led to the introduction of 3-phase AC motors.
Generally there are six motors on most diesel-electric locomotives. A
modern AC motor with air blowing can provide up to 1,000 hp.
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20. DIESEL ENGINE
This is the main power source for the locomotive.
The engines mostly used are V Type.
As the transmission is electric, the engine is used as the power source for
the electricity generator or alternator, as it is called nowadays.
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21. VIGILANCE DEVICES
• These are the devices which are used to give an alarm to the loco-
pilots on duty in case they fall asleep on duty.
• These VCDs give alarm when the loco-pilot does not perform any of
the following within 60 seconds:
1.Throttle
2.Horn
3.Dynamic Break
4.Air Break
5.Foot Break
If the pilot fails to do any of the above within 60 seconds then after
an additional 17 seconds i.e. After 77 seconds emergency break would
apply. 21

22. TEMPERATURE SENSORS
These are the sensors used to detect the temperature of the lovomotive.
Different types of sensors are:
1.R- Type (0-1800)C
2.J- Type (0-1200)C
3.K- Type (0-1000)C
4.RTD 100 (0-400)C
5.RTD 50 (0-100)C
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23. THANK YOU !!!!
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24. QUERIES???
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