American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 156)

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

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

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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