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 />
Traction <strong>Electrification</strong> System<br />
• Traction power supply, traction power distribution, and traction power return systems.<br />
Traction Power Distribution System<br />
• Overhead catenary system, overhead trolley system or contact rail system. Each may<br />
be accompanied by along track overhead or underground feeders.<br />
Traction Power Return System<br />
• <strong>Rail</strong>s, impedance bonds, cross-bonds, earth, and in the case of <strong>AC</strong> electrification, also<br />
static wire.<br />
Traction Power Supply System<br />
• Traction power substations located at predetermined spacing along the route<br />
Train Performance Simulator (TPS)<br />
• A computer program representing operation of trains based upon tractive effort of the<br />
propulsion system, resistance of the train to motion, and railroad alignment<br />
characteristics. TPS can calculate time, distance, speed, acceleration, power demand,<br />
energy consumption and losses of train for all station to station runs and for the whole<br />
route.<br />
Transmission<br />
• Delivery of power at a voltage of 69 kV or higher from generating plants across interconnected<br />
high voltage facilities to points where the power enters distribution system.<br />
Unbalance<br />
• Voltage and current unbalance occurs when a three-phase system supplies a phase-tophase<br />
load. The utility system voltage and current unbalance can be limited by<br />
alternating substation transformer primary connections to different phases of the utility<br />
power system, e.g., A-B, B-C, C-A, A-B, and so on.<br />
Voltage Flicker<br />
• Mathematically, the voltage flicker is defined as a change in voltage divided by the<br />
voltage, and is usually expressed in percent.<br />
02/27/2009 FRSC Page 45 of 250