Research on Traction Load Characteristics of Sichuan-Tibet Railway Under Different Weather

Abstract

The Sichuan-Tibet Railway faces severe challenges such as changeable weather and long ramps. In order to reduce the ramp stop accidents of locomotive, the traction characteristic curve and braking characteristic curve of the locomotive are revised considering the wheel-rail adhesion limit under different weather conditions. Then the traction quality of dry rail, wet rail and ice rail is given. The modified characteristic curves and traction quality are used to simulate the traction load of Sichuan-Tibet Railway under different rail surface conditions. The results show that under dry rail conditions, the traction quality is 2500 tons and the driving power and regenerative braking power are extremely large, respectively 20MW and 16MW. Under wet rail and ice rail conditions, traction quality and regenerative braking power are significantly limited by adhesion. When ice rail, the traction quality is only 1200 tons; the driving power and the regenerative braking power are only respectively 14MW and 9 MW. At the same time, the running interval when growing uphill is 7 minutes longer than that under dry rail conditions. It provides a reference for the layout of the train operation diagrams and the design of the traction power supply system.