Commuter Rail AC Electrification Load-Flow Simulation Report - RTD

Commuter Rail AC Electrification Load-Flow Simulation Report Revision 1
Traction Electrification System
• Traction power supply, traction power distribution, and traction power return systems.
Traction Power Distribution System
• Overhead catenary system, overhead trolley system or contact rail system. Each may
be accompanied by along track overhead or underground feeders.
Traction Power Return System
• Rails, impedance bonds, cross-bonds, earth, and in the case of AC electrification, also
static wire.
Traction Power Supply System
• Traction power substations located at predetermined spacing along the route
Train Performance Simulator (TPS)
• A computer program representing operation of trains based upon tractive effort of the
propulsion system, resistance of the train to motion, and railroad alignment
characteristics. TPS can calculate time, distance, speed, acceleration, power demand,
energy consumption and losses of train for all station to station runs and for the whole
route.
Transmission
• Delivery of power at a voltage of 69 kV or higher from generating plants across interconnected
high voltage facilities to points where the power enters distribution system.
Unbalance
• Voltage and current unbalance occurs when a three-phase system supplies a phase-tophase
load. The utility system voltage and current unbalance can be limited by
alternating substation transformer primary connections to different phases of the utility
power system, e.g., A-B, B-C, C-A, A-B, and so on.
Voltage Flicker
• Mathematically, the voltage flicker is defined as a change in voltage divided by the
voltage, and is usually expressed in percent.
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