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 />
<strong>Electrification</strong> System<br />
• Facilities and structures required to provide electrical power to the trains.<br />
Electrical Network Simulator (ENS)<br />
• Computer program to perform power demand analysis and load-flow study to deter-mine<br />
the combined performance of the traction power supply, distribution, and return systems<br />
with operating trains. The study results include train pantograph voltages, distribution<br />
system currents, substation power demand requirements and substation energy<br />
consumptions.<br />
Final Design<br />
• A design stage during which final specifications, contract drawings, schedules, and cost<br />
estimates are prepared for a specific construction project.<br />
Fluctuation of Power Demand<br />
• Because of frequent train acceleration and deceleration, and due to sudden changes in<br />
track geometry, train power demand has a highly fluctuating pattern.<br />
Fundamental Frequency Component<br />
• The fundamental frequency is the first harmonic.<br />
Grounded Equipment<br />
• Equipment connected to the conducting mass of the earth via ground rods, grounding<br />
grid, or both, to ensure an immediate discharge of electrical potential without danger.<br />
Harmonics<br />
• Voltages and currents at frequencies other than the fundamental system frequency.<br />
Harmonics are caused by non-linear circuit components such as diodes and thyristors.<br />
Harmonic Distortion<br />
• Voltage and current waveform distortion due to the harmonic currents generated by nonlinear<br />
equipment, such as thyristor-controlled equipment on board the rolling stock or in<br />
substations.<br />
Impedance Bond<br />
• An iron-core coil of low resistance and relatively high reactance used to confine signaling<br />
current to its own track circuit and to provide a continuous path for the traction return<br />
current around insulated joints to substation.<br />
Insulated Gate Bi-polar Transistor (IGBT)<br />
• A semiconductor device acting as an electronic switch capable of switching current on<br />
and off with greater efficiency and lower harmonics than thyristor.<br />
02/27/2009 FRSC Page 41 of 250
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