城市轨道交通弓网动态检测技术及其参考标准

Urban Rail Transit Pantograph-Catenary Dynamic Detection Technology and Reference Standards

目的:我国城市轨道交通(以下简称“城轨”)弓网动态检测的评价主要参考铁路领域相关标准,但考虑到城轨普遍采用低净空的刚性接触网悬挂方式,以柔性接触网为主的评价标准并不完全适用于城轨弓网动态检测。为了完善城轨弓网动态检测的技术规范,需要探讨现有的弓网动态检测技术及其标准。方法:结合我国城轨弓网关系检测现状,依次对弓网接触压力、燃弧、弓网硬点、弓网动态几何参数等动态检测指标相关的国内外标准进行了梳理,探讨了现有标准中检测手段、检测指标在我国城轨领域应用中的不足,并提出相关优化建议。结果及结论:依据现有标准开展城轨弓网动态检测,存在适用性不强、实施性差等问题。国内标准与国外标准存在诸多差异,如对燃弧率的限值规定不一;城轨采用的刚性接触网与铁路采用的柔性接触网差距较大,现有弓网动态检测标准并不太适用于城轨领域的弓网动态检测;部分弓网动态检测指标的计算较为模糊,如弓网接触压力与燃弧率等。弓网燃弧检测、动态几何参数检测等已经实现非接触式检测。非接触式检测技术有望取代接触式检测技术,成为未来弓网动态检测的主要手段。

Objective:The evaluation of PC(pantograph-catenary)dynamic detection for URT(urban rail transit)in China primarily refers to relevant standards from the railway sector.However,considering the rigid overhead catenary suspension method with low clearance commonly employed in URT,the assessment standards primarily based on flexible catenary are not entirely suitable for PC dynamic detection in URT.To enhance these technical specifications,it is necessary to explore existing PC dynamic detection technologies and their standards.Method:Taking into account the current status of PC relationship dynamic detection in URT in China,both domestic and international standards related to dynamic detection indicators such as PC contact pressure,arcing,PC hard points,and PC dynamic geometric parameters are systematically reviewed.The investigation examines the shortcomings of the detection methods and indicators in existing standards concerning their application in China URT industry,and relevant optimization suggestions are proposed.Result and Conclusion:Carrying out URT PC dynamic detection based on existing standards reveals issues such as limited applicability and poor feasibility.Numerous differences exist in domestic and international standards,such as varying limits for arcing rates.There is substantial difference between the rigid overhead catenary used in URT and the flexible catenary used in railway,rendering that existing PC dynamic detection standards can be less suitable for URT PC dynamic detection.Some calculations for PC dynamic detection indicators are rather vague,including contact pressure and arcing rate.Non-contact detection methods are implemented for PC arcing detection and dynamic geometric parameter detection.Non-contact detection technologies are poised to replace contact-based ones and become the primary means of future PC dynamic detection.