Training Reoport

7/25/2019 Training Reoport

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Training Report

on

INTRODUCTION TO DMRC

BY:

Amit Kumar

AM/RS/O&M

2658


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1.WHAT IS METRO

A Metro is a high frequency, urban Rail-based Mass Rapid Transit System

that operates totally independent from other modes of traffic

1.1 METRO NEED AND PLANNING:

20th Century- population increased from 2 to 6 billion.Global urbanisation level

increased from 10% to 50% - half the population living in urban areas & more true for

Asia.Extra-ordinary Urban Growth in Less Developed Countries- close to 3 million

people are added in Asia alone. every month Rapid urbanization results in

environmental degradation, alarming increase in road fatalities, urban congestion and

social inequity.Mass Rapid Transit System holds key to transportation solution.

1.2 ADVANTAGES OF METRO: Has a carrying capacity as high as 60,00080,000

phpdt. Requires 1/5th energy per pass km. compared to road based system.It Occupies no

road space if U/G & only about 2 mtr width of road along central median, if elevated.itCauses

no air pollution in the city and lesser noise level. it Saves journey time and over all system is

Reliable.


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Global Warming: Rail Transport Contributes very little to GHG emission i.e.2.4%

contribution to CO2emission (as per UITP publication).it Carries same amount of traffic as 9

lanes of bus traffic or 33 lanes of private motor cars (either way)

2.INTRODUCTION TO DMRC

Set up in May95 under the Indian Companies Act.

A joint venture between the Government of India and the Government of Delhi State,

with equal equity.

DMRC has the responsibility for construction and operation of Delhi Metro.

A Master Plan had been drawn up for Delhi Metro expansion, consisting of 12 lines,

covering 420 kms. to be completed by 2021 in four Phases.

Works started on Phase I on 1

st

October, 1998 and completed in December, 2005. Phase-II started in 2006 and has also been completed.

Phase-III works are in progress and are to be completed by 2016.

2.1 OPERATIONAL HIGHLIGHT

About 2800 train trips a daywith 208 train sets (1100 Coaches) on 6 lines.

Each train used to consist of 4 coaches. With the increase in commuters, the trains

are progressively being lengthened to 6 coaches and finally to 8 coaches. We have

already near about 100 six car sets.

Average Ridership more than 2.2 million passengers per day (week days),

meaning about 1,00,000 vehicles off the road. Frequency during peak hours2 m 30 sec.

The system is fullyBarrier Free for Physically challenged.

The trains now operate from 6.00 AM to 11 PM.

DMRC has introduced feeder bus short loop services to help the commuters.

2.2 BOARD OF DIRECTOR IN DMRC

ChairmanDr.Sudhir Krishna (Sec/MoUD)

Managing DirectorMr. Mangu Singh

Total No. of Directors in BOD - 17

Nominee of Govt. of India5 (Incldg Chairman) Nominee of Govt. of NCTD - 5 (Including MD)

No. of full-time functional Directors in DMRC

including MD = 8


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3.ENVIRNMENTAL CONTROL SYSTEM(ECS)

Air Conditioning System

Ventilation Supply and Exhaust Systems

Smoke Extraction System

3.1 DIFFERENT TYPES OF SYSTEM

Open System:100% fresh air, No coach air-conditioning required. Higher capacity

of AC plant as tunnel cooling is also required Very high consumption of elect. &

water. large space required for this system Less flexibility in smoke extraction

Closed System: Only 10% fresh air intake, Return air obtained by UPE

OTE system. Less consumption of elect and water. Less space required for this

system as compared to Open system, there is high flexibility for smoke removal

Platform Screen Doors: Only 10% fresh air intake in summer .Stations are air-

conditioned and separated by trackway .Return air by return air fans.tunnels are

ventilated using end shaft. For normal conditions Draught relief Shafts are used to

relieve piston effects

3.2 DIFFERENT COMPONENTS

Chillers: chillers are the unit used to provide chilled water for air

conditioning .water coming from chiller make the air cool inside AHU as per the

requirements

Air Handling Units: it is place where exchange of heat is performed. It consist of coil

duct ,filter and centrifugal fan.

Chilled and Condenser Water pumps: condenser water pump is used for circulating

water between cooling tower and condenser

Cooling Towers:It is used for removal of heat coming from condenser unit and make

it temperature approximate 27

Trackway Exhaust Fans:It is connected to OTE and UTE.so that it take air from

platform area.

Fresh Air Fans:It is used for supplying 10% fresh air in open mode and 100% fresh

air in closed mode.

Ventilation Supply/Exhaust Fans:As per ventilation and exhaust purpose in addition

to TEF.

Smoke Extract Fans: For removing smoke from concourse area and and duct is

connected to damper open outside.


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During Non-Revenue period- To provide ventilation inside tunnel for maintenance

staff

4.1 OPERATION OF TVS SYSTEM:

4.2 SUBWAY ENVIRONMENTAL SIMULATION (SES):

The Subway Environment Simulation (SES) Computer Program is a designer-oriented tool

which provides estimates of airflows, temperatures, and humidity, as well as air conditioning

requirements, for both operating and proposed multiple-track subway systems. Developed by

Parsons Brinckerhoff International in 1975.


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5 SAFTY IN O&M:

5.1 Various types of hazards:

Electrical Hazards: Electric Shock, Electric Burns ,Fires and Explosions.Other

Hazards Like Persons Falling from Height, Dropping of Tools and Object FireHazards .

Fire Hazards

Working at Height : Problems and remedial measures

Safety from Train Operation

5.2 Protection:

Earthing.

Low Voltage Supply for tools/lighting. Isolating Transformers.

Double Insulated cables.

Over Load Protection.

Protection Against Leakages (G.F.C.I.).

Flame- Proof Equipments.

Lightning Protection.

Protection against Static Electricity

5.3 CLEARANCE ABOVE GROUND OF THE LOWEST CONDUCTOR:

No Conductor Of An Overhead Line, Including Service Lines, Erected Across A

Street Shall At Any Part Thereof Be At A Height Less Than:-

1. For Low And Medium Voltage Line - 5.8 mts.

2. For High Voltage Lines - 6.1 mts.

No Conductor Of An Overhead Line, Including Service Lines, Erected Along A Street

Shall At Any Part Thereof Be At A Height Less Than:-

1.

For Low And Medium Voltage Line - 5.8 mts.

2. For High Voltage Lines - 6.1 mts


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6. MAINTANANCE PHILOSOPHY:

6.1 CLASSIFICATION OF ELECTRICAL MAINTENANCE WORK:

Routine Maintenance:Visual Inspection, Minor repairs, Replacement of small parts,

Minor Adjustments ,Cleaning of Electrical Equipments for dust and dirt and Checkingoil levels

Overhauling:Replacement of major defective component, Replacement of Other

adjacent component which might have affected and Replacement of most of the

rubber parts, gaskets

Predictive maintenance : The type of maintenance requirement which can be

anticipated in advance is termed as predictive Maintenance

Condition based maintenance:

Preventive maintenance: preventive maintenance is performed before the happening

of fault in the system.

Systematic maintenance can be carried out only during

planned preventive maintenance.

Breakdown maintenance: performed after the happening of fault. Breakdown

maintenance can be minimised with careful planning but one should be ready for

worst. External factors can also cause break downs. Following points need to be

remembered.

7.Lifts and Escalators:

DMRC has given prominent importance to the passenger comfort, so lifts and escalators are

provided for the vertical movement of the passengers among different levels of the station.

7.1 Lifts: Vertical moving vehicle that moves people or goods between floors at different

heights.

Installed with latest features like

3D LIGHT CURTAIN

PHOTO CELLS / SENSORS HAND RAILS ON SIDE WALLS

MIRROR ON THE REAR WALL

LEVELING ACCURACY+ 5mm

BRAILLE BUTTON OF LARGE

SIZE LIFT ANNOUNCEMENT

SYSTEM.

7.2 Escalators: is a moving staircasea conveyor transport device for carrying people betweenfloors of a building. The device consists of amotor-driven chain of individual, linked steps that move up

or down on tracks, allowing the step treads to remain horizontal.
http://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Electric_motor


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8. ROLLING STOCK:

The trains that are used to carry the passengers are considered to be the rolling stock or

shortly "the stock which rolls",

Composition of Rolling Stock - The basic unit of a train is Driver Trailer car--Motor car,

using this basic unit we can form 4car, 6car and 8car based upon our requirement

The components of Rolling stock and their role in its operation--

Coach shell - This is the passenger accessible area where they stay during their journey, it is

designed best for passenger comfort and safety like harmonized and modernized interior

color scheme and skid free, fire resistant floor.

8.1 HIGH TENSION SYSTEM- It collects and supplies power from high tension over head

supply to the Propulsion system. This is mounted on the DT car. The main components of

the system are

Pantograph - it connects the train electrical system to the over head supply.Current is

collected from the overhead wire by the carbons and carried by the structural members of the

unit to the power take off points on the base frame. The pantograph is raised by an air

cylinder mounted between the base frame and lower arm.

Potential Transformer - is used to measure the voltage of the 25kv centenary line. Theoutput of the Potential Transformer is used as a control signal for the C/I Box control circuit

and the SIV box control circuit.

Surge Arrestor- is a device that protects the train mounted equipment from excessive high

voltage transient conditions. Lightning strikes on the 25KV line usually causes these

transient conditions. When a transient condition occurs, the AC Arrestor quickly becomes a

low resistance path to earth and the energy of the transient spike is absorbed. Once the spike

is absorbed the AC Arrestor becomes a high resistance path to earth.


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Vacuum Circuit Breaker - is generally called the VCB. The VCB is a single pole, bi-

directional high speed AC circuit breaker. Its function is to isolate (open contacts) or connect

(close contacts) the 25KV line to the train mounted equipment. Being a circuit breaker, the

VCB also isolates the train mounted equipment when an over current condition occurs due to

a fault on the train or on the 25KV line.

Emergency Ground Switch - is a manually operated high voltage switch, which is used to

connect both sides of the VCB to earth.

Current Transformer - is used to measure the primary current drawn by the main

transformer from 25KV line. The output of the Current Transformer is used as a control

signal for the C/I unit control unit and also for the protection of the high tension equipment.

Main Transformer - is used to step down the high voltage 25KV to the required voltage

used in the propulsion system

8.2 PROPULSION SYSTEM- provides the tractive effort to accelerate the train and alsoprovides the electric braking effort, which assists in the deceleration of the train. This is

located in the under roof of the M-car. The main components of the system are

Converter/Inverter- is located in the middle of the under frame of each motor car. It gives

variable voltage and variable frequency (VVVF) control is applied for the propulsion system.

The converter converts ac obtained in the secondary windings of the main transformer to a

constant DC voltage. The Inverter converts DC power supply into AC power supply at a

desired output voltage and frequency. The inverter controls the voltage applied to the

Traction Motors to modify the attractive effort and controls the frequency to change motor

speed.

AC Reactor- operates in conjunction with the AC Capacitor to provide the main line current

filtering i.e., improves the waveform of the current through the secondary winding of main

transformer, reduces the harmonic current in the supply system, reduce the mutual

interference between the secondary windings of the main transformer

Traction Motors- 3 Phase, Squirrel Cage Induction Motor provides the necessary torque to

move the train, it is bogie frame mounted type, complete with suitable and suspension and

transfers the traction force the electro-dynamic braking force to the driving gear by means of

the gear coupling. It is in parallel with the driving gear and tightly mounted on the transom

with two bolts at upper part and two bolts at lower part.

8.3 AUXILIARY POWER SUPPLY - provides power to the auxiliary systems such as

lighting, air conditioning, signaling and so on. It is located in the under roof of the DT-car.the

main components are

Static inverter - The function of SIV is to provide stable power supply to the train auxiliary

loads of one unit (DT+M). The different SIV outputs and their consumers are

415V A.C. three phase 50 Hz

230V A.C. single phase 50 HZ

110V D.C. used for supplying control circuitry


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Battery - is the emergency power source, which has the capacity to provide the power for the

emergency system for at least one hour. The battery voltage is monitored continuously. If it

drops below a specified level, the batteries are disconnected by the battery isolation

contactor.

8.4 BRAKES AND PNEUMATIC SYSTEM-

Pneumatic system is an integrated system which deals with generation of compressedair to supply it up to the end point. It is an assembly of different piping, Valves,

cocks, actuators and Air compressors along with their accessories.

Brake is a means to control a moving body. Depending on the type of application it

can be of two type 1. Tread brake 2. Disc Brake. Depending on medium used 1.

Vacuum Brake 2. Air brake (More efficient).

Braking in the trains is the prominent operation, which ensures the safety and the proper

operation of trains. The brakes used in the trains are of two kinds -- Electric i.e., Regenerative

braking and the other mechanical i.e., disc or thread braking operated by the pneumatic

pressure, that is why brakes and pneumatic system are inseparable. The different types of

braking used here are like Service braking during the operation of the train, Emergency

braking to provide fail safe operation of the train during incidents, Holding brake and parking

brake are similar kinds of braking with different purpose of operation. The braking effort

produced by the brakes become insufficient some times and to ensure proper braking

"Blending" of the brakes is done i.e., combination of electric and mechanical braking

according to the requirement.

AIRCON: The environmental conditions in Delhi are of wide variant, the temperatures mayreach 50 degree Celsius in peak summer and 2 degree Celsius and below during peak winter,

in order to provide comfortable environment air conditioning is arranged in the trains and the

considerable fact is that a huge chunk of the power consumption is from aircon units of the

train.

TIMS: Train Integrated Management System is both eyes and ears of the train operator, it

provides the latest and continuous updating of the train vitals so that the operator will be

aware and take precautionary steps according to the vitals shown.

PA/PIS: is the two way communication system between the train operator and thepassengers, operator will direct the passengers during normal and emergency conditions and

the passengers can communicate with the operator during emergency conditions.

8.5 SIGNALLING AND TELECOMMUNICATION:

The whereabouts of the train during operation and its further safe operation is taken care by

the signalling and telecommunication department.

The major activities done with the help of S&T are Computer based interlocking


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Automatic train protection (ATP)

Automatic train operation (ATO)

Automatic train supervision(ATS)

Fiber optic transmission based on SDH technology

Train radio communication on TETRA

Use of CCTV Train activated PAS and PIS

9. TUNNEL BORING MACHINE:

Tunnel boring machine is used for developing tunnel for metro track.

As the TBM moves

forward, the round cutter heads cut into the tunnel face and splits off large chunks of rock.

The cutter head carves a smooth round hole through the rock/soil mass the exact shape of a

tunnel. Conveyor belts carry the rock shavings through the TBM and out the back of the

machine to a dumpster .

10. E&M

1-ELECTRICAL

2-MECHANICAL

a)

Fire (detection and suppression)

b) Hydraulics (sewage and seepage)


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10.1 ELECTRICAL:

LV SYSTEM:

Electrical supply to whole of the station is from MDB located in ASS rooms nomenclature as

DB 100 for ASS I so on.MDB receives power from 33KV/415V transformer located in both

ASS rooms.LV power distributed to whole of the station at 415V, 3phase & neutral/240V,

1phase & neutral as per utility. there are Sub Main Distribution Boards (SMDB) / Motor

Control Centre (MCC) / Distribution Boards (DB) / Power Distribution Boards (PDB) etc.

DG SYSTEM:

2 sets of 415V,3 phase,50Hz, DG Set is provided at ancillary building to fetch power as

backup support for emergency condition .DG System consists of DG set, its power panel,

exhaust system, Day tank, Bulk storage tank ,Fuel system. DG sets start automatically

whenever power supply fails. DG set is suitable for continuous run for 8 hours in even cold

condition and is able to take full load within 30 seconds at all conditions fulfilled.

UPS & BATTERY SYSTEM:

2 sets of 2 x 60 KVA UPS is provided at adjacent to the ASS room.UPS is sized to power

emergency loads for 30 minutes of autonomous operation.10 KVA UPS is also installed in

ASS-3 to cater the Emergency loads of Ancillary Building.

LIGHTING & SMALL POWER SYSTEM:

To supply small power to different equipments like PC, FANS, Split AC, DRIERS etc ,we

have power sockets available at required location for which separate DBs are available

known as power socket DB which in turn is connected to MDB via SMDB. LIGHTING

system is installed throughout the station areas, tunnels, ancillary building etc. Separate DB is

available to fetch power to these lighting system which in turn is connected to MDBS.

EMERGENCY:

Fire Detection, protection system and alarms Telecommunication, Signalling and Station Control Room

CCTV & Public Address System

Security System

SCADA System

Automatic Fare Collection (AFC)

Emergency illuminated signs, exits etc

Emergency lighting at station and tunnel

ESSENTAIAL SERVICES

Fire fighting and sprinkler pumps Station Ventilation Plant & Smoke Extract Fans


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Air conditioning for equipment rooms

Tunnel Ventilation Fans

Tunnel Booster Fans & Dampers

Lifts

Emergency exhaust fans at station

SEMI ESSENTAIL SERVICES:

Water Treatment Plant

Station and tunnel drainage plant

10.2 FIRE SYSTEM

1. Fire DetectorsLocated at various places of station as per layout

2 Gas Suppression Inergen Gas Cylinder located in ASS rooms which operates

automatically in case of fire.Best featureit doesnt hamper life .

3. Hydrant PumpsIts electrical supply is from MDB via MCC, it is of different

types as

Main Hydrant Pump

Standby Hydrant Pump

Sprinkler Pump

Jockey Pump

11. OVER HEAD EQUIPMENT (OHE)

The Electrified Railway System utilizes electric power to run the Train i.e. The Rolling

Stock. This power is termed as the Traction power. There are various means by which the

electric power reaches the motor in the rolling stock which finally pulls the load i.e. the

coaches and keep its passengers commuting. And one of the novel ways is the electrical

traction

11.1 Overhead equipment

Messenger wire :The Messenger wire shall be of Cadmium copper, diameter 10.5 mm,

consisting of 19 strands, each of 2.1 mm diameter.

Contact wire: The contact wire shall be of 107/150 sq. mm hard drawn grooved copper

conductor, diameter 12.24 mm. The contact wire should be drawn out of continuous cast rods

of minimum diameter of 21mm

Return conductor: All aluminum conductor (SPIDER) consisting of 19 strands each of 3.99

mm diameter, with a nominal cross section of 233 sq.mm and a copper equivalent of 140sq.mm is used as Return Conductors. The overall diameter of conductor is 19.9 mm.


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1) Mast fitting for St insulator 2) Stay tube insulator 3) Tublar stay arm 4) Standard /

large bracket 5) Register arm 6) Steady arm 7) Bracket insulator 8) Mast fitting for

BT insulator 9) Catenary suspension bracket 10) Register arm hook 11) Drop bracket

12) Anti wind clamp 13) Inclined dropper 14) Suspension clamp 15) Contact wireswivel clip 16) Tublar stay sleeve 17) Tublar stay adjuster 18) tube cap

OVERHEAD PROTECTION CABLE (OPC):

It is an ACSR conductor run on traction masts or structures or supports and clamped to their

metallic parts/supports and connected to earth through ITL.

BURIED EARTH CABLE (BEC):

It is run along the viaduct with which all the metallic reinforcement steel bars of via duct,

piers parapet and equipments at viaduct are connected to maintain proper earthing.

12. SP,SSP,SS AND NS

Sectioning and Paralleling Post (SP)These posts are situated approximately midway between feeding posts marking the

demarcating point of two zones fed from different phases from adjacent substations. At these

posts, a neutral section is provided to make it impossible for the pantograph of an electric

locomotive of EMU train to bridge the different phases of 25 kV supply while passing from

the zone fed from one substation to the next one.


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Sub-Sectioning and Paralleling Post (SSP)One or more SSPs are provided between each FP and adjacent SP depending upon the

distance between them. In a double track section. Normally three interruptors are provided at

each SSP i.e. two connecting the adjacent subsectors of up and down tracks and one for

paralling the up and down tracks

Sub-Sectioning Post (SS)

These are provided only occasionally. These are similar to SSPs with provision for sectioning

of the OHE but not paralleling

.

Neutral Section (NS)To separate OHE of two adjoining feed posts. A short neutral section (PTFE) type is

provided opposite to the Traction Sub Station to avoid the need of lowering the pantograph

during extended feed conditions.

13. RIGID OVERHEAD CATENARY SYSTEM: (ROCS)

ROCS: Basic Terminology

Conductor Rail (CR): The rigid aluminum rails

Interlocking Joints: Joins two CRs

Contact Wire: Inserted inside the CR Cantilevers/Brackets: Holds the rigid CR


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Insulators: Provide insulation from the live conductor

Pieces of CR (1012m) connected by interlocking joints Suspended from the ceiling using

hinged or gliding typesupport brackets / cantilevers Transition between flexible OHE and

ROCS is equipped with transition bar and end-anchorarrangement.

Installation of ROCS in tunnels allows the possibility of smaller tunnel diameter as the

clearances required are less. Dispensing with tensioning equipment such as balance weight

assemblies or hydraulic tensioning devices in ROCS. Maintenance is made significantly

easier than with conventional Flexible OHE system, because the installation is fit and forget

in nature. The initial cost of ROCS is high, but lifespan cost is much lower due to

substantially lesser maintenance costs


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14. EARTHING & RETURN CURRENT CONTINUITY:The 25kV ROCS has an induction effect on the other services that are running inside the

tunnel. As a result, voltage is induced in the non-current carrying metallic parts inside thetunnel such as walkway, water pipe, hydrant pipe, reinforcement steel, cable armours etc. As

per the international standards, the induced voltage shall be limited to 60V. This requires

connection of all services / equipments TEW, at frequent and regular intervals.

15. NEUTRAL SECTION:

Feed from one substation on single phase 25 kV, depending on number of trains and voltage

drop, gets limited to 16 to 20 kMs .Further, feed is taken from another substation.To keep

system balanced within permissible limits , single phase traction supply is taken fromdifferent phase at adjacent substations. If OHE is continuous between 2 RSSs, two phases

will get short circuited

ROCS : IOL Type (F&F design)

Elevated (Rail Corridor):

AF type short Neutral section:

Systra Type Neutral Section

AF type Neutral section with ASNS

ASHS


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16. RRV/RESCUE VEHICLE IN DMRC, SP DEPOT

RRV means rail cum road vehicle, which can move on road as well as on rails .The vehicle is

used to carry re-railing & rescue equipment. In case of derailment or any accident, we can

approach the site with all equipment and manpower at the earliest to reduce downtime .In

case of an accident we use the rescue equipment (such as hydraulic cutter, spreader and air

bags) for rescue operations. Whenever axle bearing seizes, the coach cannot move. We usethe auxiliary trolley provided in RRV. The axle wheels are placed on the auxiliary trolley,

which moves on the rails. Thus we can bring the coach with defective axle to the nearest

workshop.

17. AUXILIRY (33KV) & TRACTION (25 KV) POWER SUPPLY SCHEME

TRACTION (25Kv, 1-phase) :To run the trains.25 kv supply fed to the train through OHE

or ROCS.

AUXILIARIES (33KV, 3-phase stepped down to 415V, 3-phase) :To power all the facility

of station load , lighting ventilation,AC ,lifts,escalators etc .

POWER SUPPLY DISTRIBUTION IN DMRC

Rail Corridor

(220, 132, 66 kV) / 33 kV

AMS

(220/132/66 kV) Receiving

RSS

(220, 132, 66 kV) / 25 kV

TSS

ASS ASS

Traction Power

Supply

Auxiliary Power

Supply ASS

Stations

ASS

SSP/SS SSP/SS

TSS


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17.1 Receiving substation(RSS):

The 3-PHASE Electric Power from the Grid at 220kV , or 132 kV, or 66 kV as available at

that location is received in DMRC Substation.

17.2Traction Substation (TSS):

The above received 3-phase Power at 220kV or 132 kV or 66 kV in RSS is then stepped

down to 25kV 1-phase for powering the trains through OHE.

17.3Auxiliary Main Substation (AMS):

The above received 3-phase Power at 220kV or 132 kV or 66 kV in RSS is then stepped

down to 33kV 3 phase to supply power to 33kV power supply Cable network to feed


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Auxiliary Substations (ASS) in each of the Metro stations.

18. TYPES OF SUBSTATION:

Air insulated substation: These substation require more space for installing circuit

breaker,arresters etc.


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Gas insulated substation:

It require very less space but more cost involved. this is a totally compact system of

arrangement of CB,bus coupler,isolator etc.

19.EARTHING AND GROUNDING:

Earthing :

Earthing implies connection of non current carrying parts to ground like metallic

enclosures.Earthing is for human safety .Under balanced operating condition of power

systems, earthing system does not play any role. But under any ground fault condition, it

enables the ground fault current to return back to the source without endangering humansafety.

Grounding:

Grounding implies connection of current carrying parts to ground. It is mostly either

generator or transformer neutral. Hence it is popularly called neutral grounding .In case ofresistance grounding system, it limits the core damage in stator of rotating machines. In case

of solidly gounded system, substantial ground fault current flows enabling sensitive fault

detection and fast clearance .means it is used for equipment safety.

Booster transformer:

These are power transformers, with a ratio of 1/1 usually, spaced a few kilometers from each

other along the track. They permit to force the return current to flow through a cable specially

installed for this purpose.

Impedance bond:

It is a bond installed by signal and telecom department, which provides a low impedance path

for the traction return current and relatively high impedance path for track circuit current.


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Structure bond:

Bond connecting the non-current carrying metallic parts of traction mast or structure or

support to the traction rail.

Connection of OPC ,BEC and RC with impedance bond:

19.SCADA (SUPERVISORY CONTROL AND DATA ACQUISITION SYSTEM)

Supervision:

Supervision of the power system (RSS, TSS, AMS, ASS, 25KV posts) interactively with

schematic pictures which illustrate the real time status of CB, Isolators, PT etc. and direct

the operator to make correct decisions.

Control:

The operator performs control operations like open or close the CB, isolators, interrupters etc.

Supervision and control is done by TPC at OCC


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Data acquisition:

Process information is stored on a process database and a report database in the form of

event list,energy reports and graphs.

20.DEPOT DESIGN:

.

1)Stabling lines:

Stabling shed is for stabling of trains. 40% covered facility is planned for the stabling of

rolling stock during off-peak period during daylight hours. The arrangement of stabling

sidings shall provide for flexibility of train marshalling within the space constraints. The

space between sidings shall be sufficient to include pathway to be constructed between each

track to provide access for internal train cleaning. Pathway is extended to full length of

stabling. Stabling line should be preferably located in such a manner that all the incoming

lrakes from the main line can be directly sent to the stabling line via AWP without anyrequirement of shunting.

2)Inspection lines:

It is used for light maintenance purposes.here under roof and over roof maintenance can be

performed.

3)Work shop lines:

It is used for heavy maintenance purpose.here electrical cranes and pressure lines areavailable for carrying out maintenance.


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4)Automatic wash plant:

Provision shall be made for rolling stock exterior surfaces to be washed using a fully

automated train washing system, with a throughput capacity of not less than five trains per

hour. The front and rear faces shall be washed manually. The type of washing system shall

depend upon the rolling stock manufacturer's specifications for exterior cleaning. The

washing system shall be capable of a high degree of cleaning agent recycling. The

maintenance cycle for washing and cleaning shall be as under:

5).Pit wheel lathe:

The wheel re-profiling of complete train car length of 8 coaches will be done on pit wheel

turning lathe. The frequency of wheel re-profiling can be known only after actual service.

However, it is expected to be between 12 to 15 months though during initial running it may

be more frequent.

6) Main entry and exit of Depot:

Depot Main entry road shall have sufficient radius of curvature (not less than 18meter) for

easy maneuvering of trailer carrying Rolling stock coach.

7) Test track:

A test track of suitable length say 1000m long may be provided for testing of 8-car train at

full speed of 80kmph. This line may be suitably isolated from other stabling lines for safety

requirements. Test is for testing of trains after over-hauling of rolling stock to issue fitness

certificate of train for revenue service.

8) Depot control centre:

A depot control center will be provided for controlling the Train movement to and from the

main line and within the depot. The Centre will be housing Signalling and train control

equipment including power supply arrangements and a control panel for carrying out

operation within the yard as well as movement of empty rake from and to mainline.

9)ETU building:

For maintenance of over head centenary maintenance vehicle.

10) DCOS:

The DCOS Store will provide facilities, to account for all DMRC Metro Corridor

maintenance and operational requirements for materials and supplies, spare parts and

overhauled components waiting to be put back in service.
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TABLE OF CONTENT

S .NO TOPIC PAGE NO.

1. What is metro...1

2. Introduction to DMRC............2

3. Environmental control system..............................................3

4. ventilation control system.....................................................4

5. safety in O&M......................................................................5

6. Maintanance philosophy........................................................

7 Lift & Escalator.....................................................................

8 Rolling stock ........................................................................

9 TBM.......................................................................................

10 E&M......................................................................................

11 Overhead equipment................................................................

12 SP.SSP,SS AND NS.............................................................

13 ROCS...................................................................................

14 Earthing and return current continuity..................................

15 Neutral section.........................................................................

16 RRV..................................................................................

17 Auxillary and traction power supply scheme.....................

18 Types of substation..............................................................

19 Earthing and grounding......................................................

20 SCADA................................................................................

21 Depot design..........................................................................

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