Commuter Rail AC Electrification Load-Flow Simulation Report - RTD

Commuter Rail AC Electrification Load-Flow Simulation Report Revision 1
Load Factor
• The load factor is defined as the ratio of average to peak power demand or current
occurring in the same time interval. Because the traction load is highly fluctuating, the
load factor of individual substations may be low where the train density is low.
Messenger Wire
• Upper wire in a catenary system from which the contact wire is suspended by means of
hangers.
Milepost
• An identifier for a given location along a railroad line. Mileposts may or may not be
located exactly one mile apart and may not be sequentially numbered.
Multiple-Unit
• A railroad car equipped with own propulsion system, braking system, and auxiliary
devices.
Non-Coincident Power Demand
• Non-coincident power demand is a sum of the maximum power demands at system
substations metered regardless of time of occurrence.
Non-Conjunctive Billing
• Non-conjunctive billing takes place when the maximum demand at each system substation
is chosen for demand billing regardless of time of occurrence.
Pantograph
• Locomotive or EMU collector of traction power from overhead catenary system.
Pantograph Head
• Uppermost part of the pantograph fitted with the current collector which slides on the
bottom of contact wire.
Paralleling Station
• Stations containing circuit breakers or switchgear line ups used for paralleling of traction
power distribution system circuits. Catenary paralleling achieves better current sharing
between the conductors, lowers the effective impedance between substations and trains,
and results in lower voltage drop. In an autotransformer system the paralleling stations
also parallel the feeders and contain autotransformer to transform the feeder/catenary
voltage to catenary/rail voltage.
02/27/2009 FRSC Page 42 of 250