Study of ATP (Automatic Train Protection System /ALSTOM) for Delhi MRTS

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Study of ATP (Automatic Train Protection System
/ALSTOM) for Delhi MRTS

• Mahesh C.Yadav
• AESTE/Signal/Railway Board
• Under guidance of
• Sh Praveen Kumar
• Course Director- Sh Amit Jain PS
• IRISET

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Metro Rail
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Delhi Metro Network Phase I

• Line 1 (Rail Corridor), 22 Km in Length
• Elevated/ Surface
• Shahdara Rithala
• R1 Section Shahdara Tis Hazari
• R2 Section Tis Hazari Tri Nagar
• R3 Section Tri Nagar Rithala
• Line 2 (Metro Corridor), 11 Km in Length
• Underground
• Vishava Vidayalaya Central Secretariat
• M1 Section Vishava Vidayalaya Kashmere Gate
• M2 Section Kashmere Gate Central Secretariat

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Delhi Metro Network Phase I (cont..)

• Line 3 (East West Corridor)
• Mostly Elevated
• 23 Km in Length
• Indraprath Dwarka

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Train Control Signaling System for Delhi Metro

• Computer Based Interlocking
• Continuous Automatic Train Control (CATC)
• Automatic Train Protection (ATP)
• Distance to Go with Track to Train communication
  through Coded AFTC with Cab Signalling
• Automatic Train Supervision (ATS)
• Automatic Route Setting Automatic train
  Regulation
• Centralized control from Operational Control
  Centre
• Automatic Train Operation (ATO)
• For Metro corridor only

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Continuous Automatic Train Control System (CATC)

• Consists of
• 1. Automatic Train Protection (ATP)
• 2. Automatic Train Supervision (ATS)
• 3. Automatic Train Operation (ATO)

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Why CATC ?Limitations of Conventional Signaling

• Does not indicate
• speed to go, distance to go, exact location of
  the train, gradient of track in ahead, position
  of door opening/closing of coach.
• Visibility depends on curvature weather.
• No control on drivers mistake.
• Higher margin in speed, distance between two
  trains to be kept.
• No optimum utilisation of system.
• Results in lesser safety headway.

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What CATC Does ?

• Auto Route setting, Auto train separation, (ASMs
  duty).
• Cab signaling, broken rail detection,Indicates
  permitted speed.
• Auto start, Over speed protection, Auto stop,
  Auto coasting, stops train if door opens, over
  speed alarm, (Drivers duty)
• Passenger Safety by door opening / closing,
  Emergency stop(Guards duty)

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What is CATC ?

• Traffic micro-regulation, Time Table
  Generation(Control Office Job)
• Passenger information display (Commercial Job).
• Maintenance monitoring, Crew performance
  Monitoring (Managerial Job)

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CATC

• It is not only a Signaling System
• It is an integrated train control system.

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SUB- Systems of CATC

• Operation Control Center (OCC).
• Communication Channel from OCC to way side ATP
  sub-system.
• Way Side ATP System (at stations).
• On Board ATP equipment (on train).
• Track to Train communication-AFTC(track side)
• Solid State Interlocking (SSI)

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Automatic Train Protection (ATP)

• Cab Signalling
• Track Related Speed Profile generation based on
  line data and train data continuously along the
  track
• Continuous monitoring of braking curve with
  respect to a defined target point
• Monitoring of maximum permitted speed on the line
  and speed restrictions in force
• Detection of over-speed with audio visual warning
  and application of brakes, if necessary
• Maintaining safety distance between trains
• Monitoring of stopping point
• Monitoring of Direction of Travel and Rollback
• Releasing doors on the correct side of the
  platform when train comes to a stop

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ATP Sub-Systems

OCC
T
WS-ATP
WS-ATP
WS-ATP
TC
SSI
SSI
SSI
TC
TC
Track to train communication

On board ATP
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Track to Train Communication

• Coded Audio Frequency Track Circuit
• Detects train occupation on track.
• Transmission of message to give advance
  information about status of track, points, route,
  signals, block, headway regulation, platform
  side, stoppage . . .

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Trainborne ATP-ATO functions

• Ensures train location based on odometer and
  trackside beacons.
• Emergency braking control.
• Receives information from WS-ATP about section
  ahead.
• Door opening authorization.
• Controls train motion, departure order,event
  logging, maintenance monitoring, ..

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SYSTEM OVERVIEW
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Cab Signalling Drivers MMI
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Movement of Trains in ATP
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ATP system initialisation

• To be fully operational ATP system needs
• -1-To receive Information from ATC trackside
  equipment,
• This operation can be performed by two ways
• stationary initialisation
• moving initialisation
• -2-To calibrate the odometer

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Modes of Train Running

• ATO or Auto
• Only on Metro Corridor
• ATP or SM (Supervised Manual) or MCS (Manual Cab
  Signal)
• ROS (Running On Sight)
• On failure of ATP mode
• Max. Speed will be limited to 25 kmph by ATP
• RM (Restricted Manual)
• In Depot
• Max. Speed will be limited to 25 kmph by ATP
• Cut Out Mode
• On complete failure of ATP Equipment
• Max. Speed will be limited to 25 kmph by Rolling
  Stock

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Speed Monitoring Operation in Main
Line Train Movement MonitoringATP insures
that1-In MCS ModeMaximum train speed is 80
KphOr Maximum train speed PSR speed value
(Permanent Speed Restriction)Or Maximum train
speed TSR speed value ( Temporary Speed
Restriaction)As soon as the train speed is
higher than the maximum authorised speed, the EB
is triggered.

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Operation in Main LineTrain Movement Monitoring

• ATP Ensures
• In MCS Mode
• The Total energy of the train can be absorbed by
  the braking force
• In ROS Mode This function is not performed by
  ATP system
• Energy monitoring

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Train Movement Monitoring

• ROS (Running on sight )supervision
• ATP Ensures that
• In ROS Mode
• Maximum train speed is 25 Kph
• Position of mode selector is SM (ATP)
• As soon as the train speed is higher than the
  maximum authorised speed, the EB is triggered

AT
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ROS Driving Mode Management

• Track circuit failed
• This mode is used for passing a zone that has NO
  transmission of
• cab signal information (failure situation)
• Train is stopped in front of a restrictive ATP
  limit
• ROS is activated by an aware action of the
  driver, by
• pressing the ROS push-button after authorisation,
• Note Mode selector has first to be switched
  out of
• ATP and back.
• If the localisation is not lost, as soon as the
  train is on an
• operating track circuit, the MCS driving mode is
  automatically
• activated

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HIGH LIGHTS

• Cab signal Proceed is given by MCS mode
• Target speed is non zero
• Supervision indicator is Green
• Target speed includes speed restrictions
• Stopping positions are given by marker boards
• Note on signals
• Line signal can be Green, Blue , Blank
• will be no cab signal proceed with red signal

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Maintenance Precautions for CATC

• It is a Major Computer Network System with multi
  discipline users.
• Protect from Password - unauthorized person must
  not modify any parameter.
• Needs Sincere maintenance.
• Protect from virus.
• Skilled Maintenance staff.
• Thorough testing before commissioning.

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Signal Equipment ROOM
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OCC Theatre
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• THANK YOU