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由电气化铁路工程局电化勘测设计研究院完成的科研“磨耗量变化对确定导线载流量影响的研究”1991年10月31日通过了铁道部的部级评审。由于接触网导线与受电弓的直接接触,使其长期处于磨擦状态,导线磨耗量的不断增大,造成其机械强度和允许载流量都在不断下降,甚至有拉断和烧坏的可能,这将直接影响铁路运输的安全,这是电气化铁路接触网设计和运营中急需解决的课题之一,为此1989年铁道部科技司下达了“电气化铁道牵引网悬挂导
Research by the Electrification Survey and Design Institute of Electrification Engineering, Institute of Electrification, Railway Engineering, “Research on the Influence of Wear Change on Determining the Current Carrying Capacity of Conductors” passed ministry-level review of Ministry of Railways on October 31, 1991. Due to the direct contact between the contact wire and the pantograph, the wire is in a state of friction for a long time, the amount of wire worn continuously increases, causing the mechanical strength and the allowable current carrying capacity to decline constantly, This will have a direct impact on the safety of railway transportation. This is one of the urgent problems to be solved in the design and operation of the electrified railway OCS. In 1989, the Ministry of Science and Technology of the People’s Republic of China promulgated the "Electric Railway Traction Network Suspension Guide