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