Chennai Metro Rail Fitted With EVRs

Chennai Metro Rail Fitted With EVRs

Event Recorder and Energy Regeneration in CMRL Metro Trains.

Event Recorder (EVR):

A special feature of CMRL Rolling Stock is an Event Recorder (EVR). All CMRL metro trains are fitted with EVRs. Each train has one EVR connected to the train control and management system (TCMS) network.

The functions of the EVR are

• To record train data to act as a judicial recording unit

• Receive train data from the vehicle network. 

• Fault monitoring and reporting in Driver’s Display Unit (DDU)

The EVR is synonymous to a flight data recorder in aircraft (Black box). In addition, aircrafts have Cockpit voice recorder which records communication made by pilots. The footages of CCTV surveillance cameras in train are recorded by a separate system through network video recorder (NVR).

An EVR can provide vital train data even after major unusual events. The digital output from EVR is protected against surges and transients in order to comply with the specifications of EN50155 and EN50121-3-2. All the digital signals are sampled periodically by the Event Recorder.

Regeneration of Energy:

CMRL Rolling Stock is capable of regeneration of energy during braking mode. The train is equipped with Induction motor per axle in the Driver Motor coaches. These motors are controlled through VVVF drive. During braking mode of the train, the induction motors are utilized as generators and the same will feed back power to the overhead line.

This re -generated power is instantaneously utilized for all auxiliary equipment inside the train and also the energy is used for other trains running in the same network.

All coaches have emergency buttons to alert the driver. A state of the art design, air-conditioned, light weight, made of stainless steel, with 3 phase AC drive and regenerative braking system.

The cars will have Automatic Train Protection (ATP) and Automatic Train Operation (ATO). All the cars are provided with electrically operated bi-parting automatic sliding doors to ensure the safety of passengers. Besides, these cars will have electronic route map, Public Address system, Passenger Emergency Intercoms, Video surveillance and CCTV.

Each rake shall have two wheel chair parking location for the benefit of physically challenged persons. The cars will be equipped with gang ways to facilitate easy movement of passengers from one car to another. The cars will operate on 25 KV through an Overhead Catenary System.

Source:CMRL