研究目的: 接触网锚段关节作为接触网系统的核心部位,其整体设计理念对弓网受流性能起关键性作用。接触网五跨关节设计时一般在两支过渡处预留一定高度的屋脊,以减少弓网压力,但是等高点的抬高量目前无明确要求,其大小将影响弓网受流性能,情况严重时可能影响列车运营安全。因此研究五跨锚段关节等高点位置对接触线抬升量及弓网接触压力的影响,对于提升接触网弓网受流质量、确保高铁运营安全具有重要的意义。本文利用理论分析、弓网仿真等手段,对时速350 km等级接触网五跨锚段关节等高点高度对接触网整体弓网性能的影响开展研究。
研究结论: (1)后弓通过时接触线的抬升量远大于前弓通过时接触线抬升量,后弓的弓网接触力远大于前弓弓网接触力,同时后弓的接触力标准偏差明显大于前弓接触力标准偏差;(2)接触线最大抬升量和弓网接触力最小值一般均发生在锚段关节等高点附近,主要原因是等高点处两支导线有抬升的屋脊,由于受电弓的惯性原因通过屋脊后接触线会有短暂的大幅度抬升且接触力瞬间变小;(3)时速350 km等级高速铁路接触网五跨锚段关节等高点抬升量可以选择在30 mm至60 mm范围,但是弓网受流最优时为锚段关节等高点抬升量一般在30 mm到40 mm之间;(4)本文研究成果适用于电气化铁路接触网专业领域。

Research purposes: As the core part of overhead contact system, the design concept of the overlap plays a crucial role in the pantograph-catenary current collection. When designing the five span overlap of the overhead contact system, a certain height of the roof ridge is usually reserved at the transition point between the two supports to reduce the pressure on the pantograph and catenary, however, there is currently no clear requirement for the lifting amount of the contour point, and its size also affects the current collection performance of the pantograph and catenary.In severe cases, it may affect the safety of train operation. Therefore, studying the influence of the contour point position of the five span overlap joint on the lifting amount of the contact line and the contact pressure between the pantograph and the catenary is of great significance for improving the current collection quality of the catenary and ensuring the safety of high-speed railway operation. In this paper, theoretical analysis, the simulation of pantograph-catenary and other means are used to study the impact of the height of the five span overlap contour point of the overhead contact system with a speed of 350 km/h on the overall pantograph and catenary performance.
Research conclusions: (1)The lifting amount of contact wire, pantograph catenary contact force and standard deviation of contact force when the rear pantograph passes are far greater than the lifting amount of contact wire, pantograph catenary contact force and standard deviation of contact force when the front pantograph passes.(2)The maximum lift of the contact wire and the minimum contact force between the pantograph and the catenary generally occur near the contour points of the overlap. The main reason is that the two conductors at the contour point are lifted. Due to inertia, the contact line of the pantograph will be lifted significantly for a short time after passing through the roof ridge, and the contact force will be reduced instantaneously.(3)The elevation of the five span overlap of the high-speed railway overhead contact system with a speed of 350 km/h can be selected in the range of 30 mm to 60 mm, but the elevation of the contour point is between 30 mm and 40 mm when the current collection of the pantograph and catenary is optimal.(4)The research results of this paper are applicable to the professional field of electrified railway overhead contact system.