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 />
arrangement will result in the feeder-to-rail and a catenary to rail systems that operate at a 25<br />
kV nominal voltage with the feeder-to-catenary system that operates at 50 kV nominal voltage.<br />
9.2.2 Electrical Power Utility Interface<br />
The local power utility company Xcel Energy, is able to provide two 115 kV feeders to the two<br />
traction power transformers at Sandown substation. At Argo substation, only one 115 kV feeder<br />
is available. The traction power transformer primary winding phase connections should be<br />
rotated among the available phases. Considering the loadings of the substation transformers,<br />
when two transformers are located in Sandown and Argo substations, the following connections<br />
are proposed to aid in balancing the load within the Xcel system:<br />
• Sandown Substation, Transformer 1 – Phases A, B<br />
• Sandown Substation, Transformer 2 – Phases B, C<br />
• Argo Substation, Transformer 1 – Phases A, B<br />
• Argo Substation, Transformer 2 – Phases C, A<br />
The lowest loaded transformers, Sandown Transformer 1 and Argo Transformer 1, are<br />
connected to the same phases (A & B), while the highest loaded transformers, Transformer 2<br />
and Argo Transformer 2, are connected to different phases (B & C and C & A).<br />
In the event that only one transformer is installed in Argo, the three transformers in Argo and<br />
Sandown substations should be connected to the Xcel system as shown below:<br />
• Sandown Substation, Transformer 1 – Phases A, B<br />
• Sandown Substation, Transformer 2 – Phases B, C<br />
• Argo Substation, Transformer 1 – Phases C, A<br />
9.2.3 Power Supply System Design and Protection<br />
The traction power transformers are liquid-immersed, constructed and tested in accordance with<br />
IEEE 57 series of standards.<br />
Each transformer typically includes its own complement of accessories and protective devices,<br />
including phase and ground fault time overcurrent relays, as well as sudden pressure and<br />
differential relays operating with no intentional delay. It is recommended that the system<br />
protection is fully coordinated with the power utility.<br />
02/27/2009 FRSC Page 29 of 250