Commuter Rail AC Electrification Load-Flow Simulation Report - RTD

Commuter Rail AC Electrification Load-Flow Simulation Report Revision 1
9.6 NORMAL AND EMERGENCY OPERATION
9.6.1 Normal Operation
During normal operation of the power system, i.e., when all equipment, including substations, is
in service, each traction power transformer feeds its own section of track. A section of track in
this context is defined as follows:
• A section extending from the traction power substation transformer to the end of the
system
• A section extending from the traction power substation transformer to the switching
station
Using the above definitions, the RTD system has four sections:
• Section 1 – The Gold Line end of the system to Argo substation TPS-2 - transformer T1
• Section 2 – Argo substation TPS-2 - transformer T2 (or T1 if only one transformer is
installed) to switching station SW-1, DUS, and the end of North Metro Corridor
• Section 3 – Switching station SW-1 to Sandown substation TPS-1 - transformer T1
• Section 4 – Sandown substation TPS-1 - transformer T2 to the DIA
9.6.2 Transformer Outage
When two transformers are installed in Sandown and Argo, following a transformer outage at
either substation, continuity of power supply to the section is achieved by closing of the feeder
and catenary bus-tie circuit breakers at that substation. The substation transformer remaining
in-service then feeds both sections of the system.
In the event that only one transformer is installed in Argo, the transformer outage renders the
whole substation out of service, and operation continues as described below.
9.6.3 Substation Outage
In the event of an entire substation failure, continuity of power supply would be provided by the
remaining in-service substation. For example, should Argo substation fail, Sandown substation
transformer T1 must be capable of supplying its own section of the system up to SW-1, as well
as Sections 1 and 2 fed by Argo substation, as described above. Similarly, should Sandown
substation fail, the Argo substation traction power transformer T2 (or T1 if only one transformer
is provided in Argo) must be capable of supplying its own section of the system up to SW-1 and
to the end of North Metro Line, as well as the Sections 3 and 4 fed by Sandown substation, as
described above.
This is facilitated by the switching station and the out-of-service substation. The normally open
switching station feeder and catenary bus-tie circuit breakers and the normally open bus-tie
circuit breakers in the out-of-service substation would be closed to extend feeding of the
in-service substation transformer to the required sections of the system.
In order to prevent accidental closing of the bus-tie circuit breakers and connecting two out-ofphase
buses, the bus- tie circuit breaker operation is interlocked. The interlocking circuit allows
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