American Audio VELOCITY - REV 4-05 Operations Instructions download pdf (Page 148)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-143 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

equipment shall permit doors to be opened, panels to be removed, and

switchgear and transformers to be withdrawn easily and conveniently.

2. In underground installations, ceiling heights and openings shall permit entry

and removal of the largest components which will be installed in the room or

housing.

3. Ventilation of substation rooms or housings shall maintain the interior

temperature within limits suitable for full operation of all substations power

equipment. Air conditioning may be used if demonstrated to be cost

effective.

4. Sites for at-grade Substations shall be chosen taking in consideration the

proximity to Utility points of supply and environmental factors in relation to

the area on installation.

9.18.6 Sectionalization, and Emergency Trip System-ETS

A. Sectionalization

1. The Traction Power System shall provide means of isolating individual

sections of the Third Rail and/or Overhead Contact System-OCS for

maintenance purposes and/or for attendance to track incidents.

2. The line will be sectionalized, as a minimum, at each TPSS. The TPSSs will

have four feeders, two feeders per line, each one providing power to one

side of the TPSS, so that a track section between two TPSS will be dual

All underground stations shall be sectionalized such that sectionalization occurs at

the normal exit end of the station. For stations that don’t have a TPSS, the normal

end of the stations shall be sectionalized by Load Break Switches-LBSs.

4. As a minimum, sectionalization shall be provided at the departure end of all

underground passenger stations through load-break switches or dc circuit

breakers.

B. Emergency Trip System-ETS

An Emergency Trip System shall be provided for de-energization of specific

sections of tracks under emergency situations, with the following requirements:

1. An ETS Blue Light Station-BLS shall be located at each tunnel at the ends of

the platforms of underground stations; at the ends of platforms of elevated

stations, as well as the ends of bridges along the alignment. A BLS per track

shall also be located at each tunnel Portal.

2. The BLS locations shall not be accessible to patrons under normal

conditions.

3. The ETS Blue Light Stations’-BLSs for underground stations and tunnel

Portals shall remove power individually from the specific tunnel where they

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American Audio VELOCITY - REV 4-05 Operations Instructions Page 148