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| Type | Commercial Circular |
|---|---|
| Topic | reservation |
| Currency | Currency not verified |
assemblies Importance of Loco TCAS modes and their transitions Learning about Loco Pilot actions under different scenarios The Loco TCAS unit shall switch to the System Failure mode in case of
Train Collision Avoidance System (TCAS) Loco TCAS Basics Overview Objectives To understand the basic working principle of Automatic Train Protection acheived through TCAS system Knowing major components of TCAS system Knowing Loco TCAS sub-assemblies Importance of Loco TCAS modes and their transitions Learning about Loco Pilot actions under different scenarios Background Disregard of Railway Signal by Loco Pilot can lead to potential hazards Signal Passing At Danger (SPAD) is safety concern for Indian Railways Train Collision Avoidance System (TCAS), an indigenous Automatic Train Protection (ATP) system to prevent accidents caused due to SPAD, Loss of Speed Supervision, and Train Collisions by automatic application of brakes in case of Loco Pilot fails to do so Inherent feature of Cab Signalling is useful during normal running as well as in foggy weather TCAS system is designed to meet the safe operation of trains. TCAS System BRAKE INTERFACE UNIT ONBOARD COMPUTER LP OCIP SIGNAL ASPECT RELAYS STATION TCS CONTROL UNIT SIM OCP Track occupancy status Point/Switch status STATION RF ANTENNA RFID TAG READER RFID TAGS GPS & GSM ANTENNA RF, GPS & GSM ANTENNA TCAS System SIGNAL ASPECT RELAYS STATION TCS CONTROL UNIT SIM OCP Track occupancy status Point/Switch status STATION RF ANTENNA RFID TAGS GPS & GSM ANTENNA BRAKE INTERFACE UNIT ONBOARD COMPUTER LP OCIP RF, GPS & GSM ANTENNA Stationary TCAS in listening mode Location Track Identification No Direction - undefined TCAS System SIGNAL ASPECT RELAYS STATION TCS CONTROL UNIT SIM OCP Track occupancy status Point/Switch status STATION RF ANTENNA RFID TAG READER RFID TAGS GPS & GSM ANTENNA BRAKE INTERFACE UNIT ONBOARD COMPUTER LP OCIP RF, GPS & GSM ANTENNA Location Track Identification No Direction - Normal/ reverse Speed Train Length Stationary TCAS registers the loco TCAS Secured communication establishes between Loco and Stationary TCAS TCAS System SIGNAL ASPECT RELAYS STATION TCS CONTROL UNIT SIM OCP Track occupancy status Point/Switch status STATION RF ANTENNA RFID TAGS GPS & GSM ANTENNA BRAKE INTERFACE UNIT ONBOARD COMPUTER LP OCIP RF, GPS & GSM ANTENNA Stationary TCAS sends: Static Section Profile Movement Authority Signal informattion wrt to Loco TCAS location (every 2 sec) Location Track Identification No Direction - Normal/ reverse Speed Train Length (every 2 sec) TCAS System SIGNAL ASPECT RELAYS STATION TCS CONTROL UNIT SIM OCP Track occupancy status Point/Switch status STATION RF ANTENNA RFID TAGS GPS & GSM ANTENNA BRAKE INTERFACE UNIT ONBOARD COMPUTER LP OCIP Loco TCAS tries to attain zero speed before the stop signal (danger) to prevent SPAD TCAS – General Functionality TCAS Features – Speed Supervision Static speed profile The Static Speed Profile (SSP) is a description of the fixed speed restrictions for a part of track sent from track side to train Speed Supervision Loop Line Speed Section/ Line Speed Max Train Speed Permanent Speed Restrictions (PSR) Speed related to loco modes Remote Introduction of Temporary Speed Restrictions (TSR) TCAS Features - MA Movement Authority The distance upto which the train is permitted to travel safely End of Authority (EOA) Location up to which the train is permitted to proceed and where target speed should be zero TCAS Safety Features Prevention of signal passing at danger (SPAD) Cab Singnaling, loop line speed control Prevention of over-speed: section speed, train speed, PSR Protection of roll back and reverse movements Prevention of side-collision in block section Prevention of head-on and rear end collisions LC gate automatic warning SoS messages Computation of train length Shunt limits validation Centralized live monitoring of train movements in NMS Radio Unit Station Antenna SOIP Relay Rack STCAS Station TCAS Equipment • RFID Tags provided in block section at ~1 km and in stati
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