UIC 799:2001-04

This leaflet contains requirements and recommendations to ensure reliable interaction between pantograph and a.c. overhead equipment at speeds of over 200 km/h. The recommendations contained in the leaflet are in line with the state of the art and reflect the experience gained by the railways in high-speed Rail transport whilst ensuring reliability and cost-effectiveness. Account has been taken of the stipulations laid down for international traffic in the Technical Specifications for Interoperability (TSI). Pantographs with a bow profile corresponding to that defined in UIC Leaflet 794 can be used in conjunction with the overhead contact systems defined in this leaflet. Definitions Speed ranges, voltage and frequency levels, rolling stock profile, assessment criteria for pantograph/OHL interaction. Key characteristics of overhead lines Static characteristics Standard height of contact wire, maximum difference in contact wire height, minimum contact wire height for design speed 230 km/h, maximum contact wire height for design speed 230 km/h, permissible contact line gradient and change of gradient, maximum distance between OHL sections supplied at different phases. Dynamic characteristics Maximum permissible uplift of contact wire as pantograph passes at the support (without climatic influences), maximum aerodynamic contact force at maximum speed, maximum permissible dynamic contact force of the pantograph, minimum permissible dynamic contact force of the pantograph. Electrical characteristics Constant current capacity, short time rating, short-circuit current, thermal time constant, permissible current when stationary. C limatic influences Ambient temperature range, maximum wind speed, ice load. Design parameters Maximum span lengths, maximum difference in length between two successive spans, length of shortest dropper for standard system, standard system height (encumbrance), design of support, minimum uplift at the support, design of registration arm for supports, dropper spacing, sag, maximum lateral deflection of contact wire at support (stagger), minimum lateral variation in horizontal profile of contact wire per 100 m length, permissible lateral deflection of contact wire within one span with maximum side wind, number of spans per changeover of tension length, run-in of contact wire at switches, type of tensioning of contact wire and messenger wire. Parameters for the conductor material Contact wire, number of contact wires, nominal cross-section of contact wire, specific tensile stress of contact wire, maximum permissible tensile stress in contact wire with worn cross-section, maximum permissible wear of contact wear, number of messenger wires, auxiliary messenger wire, stitch wire, length of stitch wire, tensile stress of stitch wire, reinforcing wire, return conductor, protective conductor. Physical parameters Compliance, degree of variability, wave propagation speed, Doppler effect, reflection factor, amplification factor. Simulation programs and measuring procedure Simulation programs, provisions relating to measurement of contact forces, provisions relating to arc measurement. Relationships between the various structural parameters governing dynamic performance and the wear of overhead equipment on high-speed lines Static criteria Compliance, variability of overhead lines. Dynamic criteria Wave propagation speed/Doppler effect, reflection factor/amplification factor. Relationships and effects Static and dynamic criteria, their inter-relationships and effects.