LOCO SHED GOMOH

ACKNOWLEDGEMENT

I would like to express my sincere grateful and

profound gratitude to LOCO SHED ,GOMOH for

providing an opportunity to undergo Vocational

Training of 04 weeks in “ELECTRIC LOCO

SHED, Gomoh, Jharkhand’’.

I bear immense pleasure in expressing my

gratitude and thanks to all the Employees of

respective shops for their honest teaching,

practical demonstration, guidance and

suggestion in respective sections.

Furthermore, I would like to acknowledge with

much appreciation the crucial role of staffs,

who gave us the permission to use all required

equipment and the necessary materials during

our training period. CONTENTS

1. Introduction

2. Locomotives

3. Syntaxs used in Loco

4. Components of Loco

5. Different Sections of Loco

6. Brake Rigging

7. Pantograph

8. Traction Converter

9. Working of Loco

10. Conclusion

INTRODUCTION

 The ISO-9001-2008 certified Electric Loco Shed,

East Central Railway, Gomoh situated in Gomoh.

ELECTRIC LOCOMOTIVES

An Electric Locomotive is a locomotive powered by

electricity from overhead lines or on -board energy

storage such as battery or fuel cell.

Locomotives were classified by track gauge, motive

power, function and power (or model number) in a

four- or five-letter code. The first letter denotes the

track gauge. The second letter denotes motive power

(diesel or electric), and the third letter denotes use

(goods, passenger, mixed or shunting). The fourth

letter denotes a locomotive's chronological model

number

 Netaji SC Bose Gomoh has an electric loco shed

with capacity to hold 125+ locos. Locos housed

at the shed include WAP-7-29,WAG-7, WAG-9-

198.

 The main objective of this loco shed is to

inspect and maintain the locos that operate

throughout the year.

SYNTAXS USED IN LOCOMOTIVES:

 First letter (gauge):

o W – Broad gauge (wide) – 5 ft 6 in (1,676 mm)

o Y – Metre gauge (yard) – 1,000 mm (3 ft 3 3¼8 in)

o Z – 2 ft 6 in (762 mm) narrow gauge

o N – 2 ft (610 mm) narrow (toy) gauge

 Second letter (motive power):

o D – Diesel

o C – DC electric (DC overhead line)

o A – AC electric (AC overhead line)

o CA – DC and AC (AC or DC overhead line); CA is

considered one letter

o B – Battery (rare)

 Third letter (job type):

o G – Goods

o P – Passenger

o M – Mixed (goods and passenger)

o S – Shunting (switching)

o U – Multiple unit (electric or diesel)

o R – Railcar

In WDM 3A, W denotes broad gauge; D denotes diesel

power; M denotes mixed use (goods and passenger service),

and 3A denotes 3,100 hp (2,300 kW) (3,000 + 100). In WAP

5, W is broad gauge; A is AC electric; P is passenger

service, and 5 indicates that the locomotive is the fifth

model used.

COMPONENTS OF LOCOMOTIVE:

1.Transformer (including Tap-Changer)

2.Rectifier

3.Smoothing Reactor

4.Traction Motors

5.Main Starting Resistances (in DC Traction on

Dual Power Locos only)

6. Dynamic Braking Resistance Cooling Blower

7.Auxilliaries

THE VARIOUS SECTIONS THAT WERE EXPLORED

DURING THE TRAINING AT LOCO SHED ARE AS

FOLLOWS:

E-3 SECTION

E-4 SECTION

E-5 SECTION

Let’s explore the sections one by one

E-3 SECTION

This section is responsible for the inspection and the

overhauling of the traction motors that drives the

TRACTION MOTORS-

It is one of the most important equipment of electric

A 6 pole DC series wound motor with commutating

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

Ventilation system for these motors are forced and air

is supplied from separate motor blower to cool these

traction motors.

E-4 SECTION

This section is in charge of relays, speedometers,

microprocessors, battery chargers etc.

SPEEDOMETER:-

Speedometer 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.

RELAYS:-

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.

RELAYS PROVIDED IN ELECTRICAL

LOCOMOTIVES:

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.

MICROPROCESSORS:-

The main objective is to primarily locate the

faults for the loco’s correct maintainance.

It acts as the heart of the system.

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.

E-5 SECTION

This section inspects and maintains the Transformer,

Graduator(GR) and SMGR.

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.

AUTOTRANSFORMER is used because the part of winding

does double duty along with it being smaller, lighter and

cheaper. It also includes lower leakage reactance, lower

BRAKE RIGGING

The means of distributing the

a brake cylinder to the various wheels on the vehicle. It consists

of rods and levers suspended from the underframe and bogies

and linked with pins and

PANTOGRAPHS

A pantograph (or "pan", or "panto") is an apparatus mounted on

the roof of an electric train, tram or electric bus to collect power

through contact with an overhead line.

TRACTION COVERTER

Traction Converter could be a combination of one or more

inverters each controlling one or more

Electric locomotive propulsion system architectures typically provide

secondary winding of

the Traction Converter.

BRAKE RIGGING

The means of distributing the braking forces from

cylinder to the various wheels on the vehicle. It consists

of rods and levers suspended from the underframe and bogies

and linked with pins and bushes.

PANTOGRAPHS

(or "pan", or "panto") is an apparatus mounted on

roof of an electric train, tram or electric bus to collect power

through contact with an overhead line.

TRACTION COVERTER

could be a combination of one or more

inverters each controlling one or more traction motors. EMU and

motive propulsion system architectures typically provide

secondary winding of trac

loss, lower excitation current and increased KVA rating for

given size and mass.

OTHER AUXILLIARIES OF E-5 SECTION ARE:

• Motor for silicon rectifier

cooling

• Motor used for cooling

traction cooling

• Motor used for the dynamic

braking of the loco

The training at LOCO SHED GOMOH was very

helpful.

Diploma students gain theoretical knowledge

through books. It is volatile and not of much use

without knowing its practical implementation.

Training is one of the important aspects for an

diploma student’s carrier to strengthen the

practical concepts. It was an awesome

experience in training as the things we all learnt

in our previous semester was seen

implemented practically

I had a chance to see the different components

of loco as well as different sections of loco

shed, which was very interesting. So the

training was more than hope to me and helped

me to understand about loco and more.