Technical Criteria – HMRL – Hyderabad Metro Rail Limited

Tracks

S. NO.	CRITERIA	DIMENSION
1.	Gauge	1435 mm
2.	Design speed Max. operating speed	90 Kmph 80 Kmph
3.	Max. axle load, loaded condition	17 tonne
4.	Maximum Gradient Normal / desirable Limit Exceptional Limit	2.5% 4%
5.	Sharpest vertical curve radius Sharpest horizontal curve radius	1500m 120 m (main line track) 90 m (depot track
6.	Traction power collection	Overhead Catenary system (OCS) at 25kV(AC)
7.	Inclination of Rail	1 in 40
8.	Wheel tread profile	UIC 510-2 (S1002); to be interfaced with Rolling Stock
9.	Rail profile	UIC 60 (861-3)

Depots

Two depots 69.2 km rail network of Hyderabad Metro Rail are located at:

Miyapur for Corridor 1 (Miyapur –LB Nagar)
Uppal for Corridor 3 (Raidurg – Nagole)

The Uppal depot is the main depot cum workshop where the overhaul and corrective maintenance facilities for whole fleet are done. The other two depots have basic facilities for scheduled preventive maintenance and minor corrective maintenance.

Signalling and Train Control System

The advanced signalling & Train Control technology, Communication Based Train Control (CBTC), is adopted for Hyderabad Metro to control the trains. Hyderabad Metro is the first Metro in India to claim train control by CBTC technology. The trains running on three corridors are controlled and monitored from state-of-the-art Operation Control Centre (OCC) at Uppal.
The trains can run with headway of 90 Sec to cater to commuters during office peak hours in morning and in evening. The overview display panels are mimic of all three corridors and indicate current locations of all trains running on these corridors. The OCC is the primary control centre having a back-up control centre at Uppal depot to take over the operation if the OCC to be evacuated due to unforeseen situation.
Local ATS at station and VDU at interlocking station can also control the train when needed. Axle Counter based Fall-Back system is also adopted as secondary train detection system in all three corridors in unlikely event of failure of CBTC operation.
There are two major depots at Uppal and Miyapur. These depots are controlled and monitored from independent control centres at Uppal and Miyapur respectively. The signalling at these depots is based on redundant Computer Based Interlocking (CBI) system.
Test track at the Uppal depot is to facilitate testing of trains before putting them in to the passenger operation to ensure safe and reliable train operation.
The trains run on Automatic Train Operation (ATO) mode which is the normal mode of operation of trains. The Automatic Train Protection (ATP) system continuously monitors safe train operation and initiates necessary action if a train doesn’t perform as desired.
There are other degraded modes of train operation such as ATP mode, RM mode and Cut out mode which are selected as and when needed. All vital train borne equipments are highly safe and redundant to avoid any unwanted interruption of train service.
The station equipments e.g., Computer Based Interlocking (CBI), wayside ATP etc., are vital signalling equipments and redundantly arranged to ensure safe and uninterrupted train operation. Passenger Emergency Stop Plungers are provided on each platform and in Station Control Room (SCR) to stop a train immediately in case of emergency.

MEP

Station Concept: ELECTRCAL LOW VOLTAGE SYSTEM

Low Voltage Power Distribution System	Two Auxiliary transformers (33/0.415kV) are provided for each Elevated station with two separate HT feeder circuit to supply power to all the auxiliary loads.
Lighting System	The major lighting source is fluorescent lamp, energy saving, high efficiency, low loss and high power factor. The lighting system is having three illumination levels such as Emergency level 33%, (off peak hour) 66% and (Peak hour) 100% which shall be controlled automatically through lux level and timer based.
Essential Power Supply (DG Set)	Standby generator is provided at all stations to provide essential low voltage power supply to the essential loads that can maintain the operation in a safe environment in the event of the failure of the normal station power supply. The non-essential loads are shed before the generator takes up the loads
Emergency Power Supply (UPS)	Uninterrupted Power Supply (UPS) is provided with batteries at the stations to provide emergency low voltage power supply to the emergency loads that can maintain the operation in a safe environment in the event of the failure of the normal station power supply until the standby generator can take over.
Earthing System	The earthing system designed in accordance with Indian TN-S system is provided for the purpose of safety from electric shock for personnel, operation safely and to prevent stray current. Main earth Mat system is provided for each station to achieve the earthing resistance of less than 1 ohm for Electrical system equipment and Clean Earth Mat System is provided in for each station to achieve an overall earth resistance not greater than 0.5 ohm for Extra Low Voltage system equipment such as S&T, AFC and BMS system.
Low Voltage Cables	All low voltage cables, wires & control cables are XPLE, Flame Retardant Low smoke (FRLS) PVC insulated cable. Cables for Emergency Services shall be of Fire Survival (FS) type cables All LV cable conductors are of Copper.
Building Management System	Building Management System is for controlling and monitoring functions of Station MEP Equipment such as Lighting, Lifts and Escalators to provide better comfort for the Passengers of each station by effective utilization of Ventilation &Air Conditioning and Electrical installations.
Elevator	Passenger Elevators suitable for physically challenged with SS car body, machine room-less, Electric Traction with Gear less motor having VVVF Control has been provided in all stations from Street level to concourse level and concourse level to platform level.
Escalator	Escalators suitable for semi-outdoor installation have been provided in all stations.

Electrical High Voltage System: For 25 KV Traction

FIRE DETECTION AND SUPPRESION SYSTEM

Fire detection and Suppression System	Fire Detection & Alarm System of Analogue Addressable type has been provided in all stations to detect the presence of fire and initiate the Fire Suppression action through Fire Hydrant system and Automatic Sprinkler System to provide protection from Fire.
Clean Gas flooding fire suppression system	Gas Flooding Systems have been installed in all Stations to protect critical Rail System equipment from fire
Co2 based internal gas suppression system	CO2 Fire trace system is provided to extinguish the fire inside the Critical Power Supply Panels which are located in Sub-Station.

Tracks

Depots

Signalling and Train Control System

MEP

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