Commuter Rail AC Electrification Load-Flow Simulation Report - RTD

Commuter Rail AC Electrification Load-Flow Simulation Report Revision 1
• Provision of hand-operated or motor-operated outdoor or indoor type bypass disconnect
switch
• Provision of a transfer bus and an additional circuit breaker which can substitute for any
circuit breaker via the transfer bus
The distribution system should be sectionalized into electrical sections to limit the length of the
track to be de-energized following a fault or for system maintenance. The sectioning can be
performed at substations, paralleling stations, and switching stations, as well as at interlockings
where crossovers and turnouts are installed.
3.5.2 Normal Operation
During normal operation of the power system, i.e., when all major components of the system,
such as substation transformers, feeders, and autotransformers, are in service, the system will
maintain rated train operating performance during peak-hour traffic conditions. This includes
providing full performance train voltage levels to allow simultaneous starting of trains.
3.5.3 Contingency Operation
Normally, each traction power transformer feeds its own section of system. During a substation
transformer outage, continuity of supply to that section is achieved by closing of the substation
feeder and catenary system bus-tie circuit breakers. The remaining substation transformer then
feeds both sections of the system.
Each traction power transformer in a substation is recommended to be supplied by an
independent, dedicated transmission line. In this event, an outage of entire substation is
unlikely. Nevertheless, provision for such a contingency should be made in the system design.
Following an outage of an entire substation, the neighboring substations should maintain
continuity of supply. Therefore, each substation must be capable of supplying its own section of
the system as well as the adjacent sections previously supplied by the now outaged substation.
This is facilitated at switching stations. During a substation outage, the normally open switching
station feeder and catenary bus-tie circuit breakers are closed, thus extending the supply areas
of the healthy substations in operation.
When a substation at the end of the system is out-of-service, the end-of-the-line is supplied from
the closest operating substation by closing bus-tie circuit breakers in the switching station and
the outaged substation.
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