American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 156

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-151 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
of the conductors. Tension in the conductors shall remain constant up to
the conductor temperature of 130
o
F, after which a resulting increase in
temperature is to be accompanied by a decrease in tension. Tapered
tubular galvanized steel poles shall be used.
c. At Grade – Dedicated Right-of-Way
On portions of alignment other than subway or downtown areas, a
Simple Catenary Auto-Tensioned (SCAT) system shall be used. The
Catenary system shall consist of a messenger wire with a single contact
wire supported by vertical hangers. The system shall be designed to
meet capacity and power requirements without the use of supplementary
along-track feeders. The system shall be auto-tensioned by means of
weight-tensioning devices located at the termination points of the
conductors. Tension in the conductors shall remain constant up to the
conductor temperature of 130
o
F, after which a resulting increase in
temperature is to be accompanied by a decrease in tension.
d. Main Yard and Shops and Maintenance-of-Way Satellite Yards
In the yards and shops, a Single Wire Fixed Termination (SWFT) system
shall be used. This consists of a single contact wire located over the
track. The terminations of the contact wire shall be made directly to the
poles with the result that conductor tension will vary with temperature.
The poles shall be tapered tubular steel, consistent with the rest of the
system. Wherever practicable, eyebolt attachments to the exterior walls
of the shops shall be used. Cross-span wires and backbone systems
shall be used to minimize the number of poles where applicable.
4. Operations
The OCS shall be designed for vehicle operations with a design margin of 10
mph over the specified maximum vehicle operating speeds.
The OCS shall be designed for multiple pantograph operation with
pantographs spaced in accordance with the specified train consists. The
OCS shall be designed for operation of any type of Metro vehicle and take
into consideration the use of pantographs both at one of the ends (trucks) of
a vehicle or close to the midpoint of a vehicle, depending on their specific
designs.
5. Sectionalization
a. In all systems, the Catenary shall be sectionalized by means of insulated
overlaps wherever possible. In the event that an insulated overlap is not
possible, mechanical section insulators shall be used. Mechanical
section insulators shall be used at crossovers.
b. In subways, where low-profile SCFT Catenary is used, the OCS shall be
sectionalized by means of insulated overlaps. Mechanical section
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