IEEE 1791-2019 pdf free download

IEEE 1791-2019 pdf free download.IEEE Recommended Practice for Terminology Used for Direct Current Electric Transit Overhead Contact Systems.
pantograph security analysis: The analysis of the lateral relationship of the pantograph with the contact wii at a support/registration and at midspan. under prescribed operating conditions, including allowances for crosswind, track tolerances, vehicle sway, pantograph sway, temperature range, and installation tolerances.
NOTE—Based on these analyses, maximum stagger, maximum span length on tangent, and span lengths on curves are determined.
pantograph static force: The vertical force exerted upward by the collector head on the overhead contact system (OCS) contact wire. This force is caused by the action of the pantograph-raising device and the primary suspension, with the pantograph raised and with the vehicle at standstill. Svn: pantograph pressure:
pantograph up-thrust.
NOTE -Typically 8.16 kg (IS Ib) to 9.98 kg (22 Ib).
pantograph sway: Maximum lateral displacement of the pantograph induced by vehicle roll and lateral shock
loads.
NOTE A value in the range 38.1 mm (1.5 in.) io 50.8 mm (2 in.) each way (for overhead contact system LOCSI design independent of pantograph heighu. unless specified othetise.
pantograph up-lift: The distance the contact wire is lulled as a pantograph passes.
pantograph up-thrust: See: pantograph static force.
NOTE- This term is a NON-PREFERRED term. Its synonym is more commonly used, as listed in the term above.
parallel feeder: An along-track aerial bare or insulated cable mounted on the overhead contact system (OCS) poles—or an insulated cable installed in a trough or duct—that provides electrical power reinforcement to the OCS by means of feeder jumpers at regular intervals.
parallel grove clamp: A piece of hardware used to clamp two or more parallel wires together.
parallel running (length): The design length where the two parallel contact wires in an overlap are suspended at the same height.
passing-dynamic electrical clearance: The dimensional mechanical clearance bctwcen the live part of either the vehicle (such as current collector) or overhead contact system (OCS) and grounded parts of the fixed structures, or during the passage of the vehicle.
NOTE—See American Railway Engineering and Maintenance-of-Way Association’s Manual for Railway Engineering, Chapter 33 [B U.
pendulum hanger: A type of suspension where the contact wire is supported from spans, bracket arm pipes, or flat surfaces by a hanger wire or wires depending on the style of pendulum hanger employed. The contact wire is staggered in opposite directions and the hanger wire becomes inclined so that it rises as the current collector passes. creating an elastic suspension. Single hanger wire pendulums are generally used for pantograph operation. Double wire pendulum hangers are trapezoidal and allow the contact wire to liii in such a way that the vertical axis of the contact wire always stays perpendicular to the track or road plane.
NOTE— This tcnn is used only in overhead contact systems (OCSs) for trolley pole operations.
piled foundations: Steel pile foundations using a steel casing or I-beams for anchor-base poLes. pipe clamp: A piece of hardware used to attach various types of components to a pipe.IEEE 1791-2019 pdf free download.