delhi metro underground station system

1. DELHI METRO REPORT
An underground metro station is divided into:-
1. North
2. South
North side has following:-
1. North electrical system (say ASS-1)
2. ECS north plant room
3. Sewage north
4. Seepage north
5. TVS north
South side has following:-
1. South electrical system (say ASS-2)
2. ECS south plant room
3. Sewage south
4. Seepage south
5. TVS south

2. Ansalary building has following:-
1. Water cooling system
2. Air cooling system
3. DG set
4. Fire fighting system
Some legends (symbols):-

3. 1. Electrical system (includes both north and south)
1. Here ASS-1 and ASS-2 gets electricity separately from power
stations, if either of them fails then the breaker between closes.
2. When power source to both ASS-1 and ASS-2 fails, then, the breaker
closes and provides power to ASS-1 and thereby also to ASS-2.
3. UPS-100 and UPS-200 are both online, thus, when power goes a
slight fluctuation does not occur.

4. 2. Sewage system
Since sewer pumps are above the underground stations, so these motors
forces the sewage above the underground level towards the municipal sewer

5. 3. Seepage system

6. 4. TVS
TVS mode:-
1. Maintenance
2. Normal
3. Congestion
4. Tunnel energy
5. Station energy
This system is useful at the time of any disaster (like fire)occur in tunnels or
at the station.

7. Tunnel energy mode is used when fire occurs inside the tunnels
Station energy mode is useful when fire occurs inside the platform
5. ECS (Environmental Control System)
This system is helpful in creating a friendly environment for the passengers
traveling in the underground stations.
90% of the air inside is colled downed and reused again and rest 10% is the
fresh air taken from outside environment.

8. This air is mixed and then passed through AHU(air handling unit) where it
gets cools down. After treatment through AHU then passes to platform and
concourse.