American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 150

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METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS
DE304.09 9-145 Revision 4 : 05/09/12
Metro Baseline Re-Baseline: 04/29/10
7. Under normal operation, each one of these two power sources shall provide
power to approximately half of the station loads as determined by the
stations low voltage design.
8. In the event of loss of power provided by one of the two auxiliary
transformers connected to the same loads, the system shall transfer the
respective loads to the remaining transformer, through the closing of
normally open tie breakers.
9. The operation of the tie breaker described in the previous paragraph shall be
either manual or automatic, as chosen through a manual-automatic switch.
The tie breakers shall be interlocked in such a way as to prevent the
connection in parallel of two different auxiliary transformers at any time. The
automatic-manual switches shall be included in the interlocking and their
operation at any time shall not allow the connection in parallel of the two
transformers. This interlocking shall be hardwired and fail safe. Fail-safe
means that upon the occurrence of any relay malfunction and/or open circuit
in the interlocking circuitry, no change in the configuration of the breakers
shall be allowed either in automatic or manual operation. The use of dual
redundant PLCs for controls and interlocking of the system may be
considered upon submission and approval by the Authority.
B. Emergency Back-up Power Supply - EBPS
1. The purpose of the Emergency Back-up Power System – EBPS, shall be to
provide power to the ventilation fans required to maintain a minimum air flow
throughout the underground facilities, as established on Section 8-
Mechanical of these Criteria. The EBPS shall also provide power to all
Facilities and Communications UPSs at each station. The EBPS shall be
operated in case of complete loss of utility power on all TPSSs at each
section of the line powered by one of the trainway feeders.
2. The EBPS shall supply power to the trainway feeder trough a 480 VAC
Diesel Generator and a step-up transformer to the trainway feeder voltage
level.
3. The EBPS shall include the means of shedding all the loads that are not
intended to remain in operation during its operation as above described.
4. The EBPS shall be activated through a sequence of operations performed
remotely at the Rail Operation Control – ROC. A complete procedure
describing all the controls sequence for implementation of the EBPS shall be
provided, as well as the procedures to re-establish the system to its normal
configuration.
9.18.8 Wayside Distribution
A. DC Power Cables, Supports, and Ductwork
1. The traction power cables connecting the DC feeder breakers or wayside dc
disconnect switches to the wayside distribution, and from the running rails to
the negative bus shall be sized to accept maximum overload currents and a
temperature rise not to exceed safe insulation design limits of the cables,
based on a minimum insulation life of 40 years.
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