Electric railways are subjected to preventive maintenance to maintain a stable supply of electric energy to railway vehicles. The feeder cable is the main equipment of an electric railway that supplies stable electric energy to the Overhead Contact Line. The airport railway in Korea has many bridge sections and a feeder cable is used to secure the insulation distance from the messenger wire. A bridge section is a complex structure consisting of two stories, and the railway section on the lower story consists of a structure similar to the tunnel on the upper story. However, the insulation equipment on the lower story is decontaminate from natural environment such as rain, snow, tunnel and see. The lower story is closer to exposed locations such as the sea, and the degradation rate is high due to salt damage. In this paper, we propose a method for increasing the life expectancy of insulation equipment installed in a section subject to salt damage. Therefore, the insulation performance of the feeder cable installed on a sea bridge was measured. The life-cycle assessment was shown in a health index by applying a weighted average. In addition, the life expectancy was predicted by considering the health index and the remaining life.

电气铁路要进行预防性维护，以保持向铁路车辆稳定的电能供应。馈线电缆是电力铁路的主要设备，可为架空接触线提供稳定的电能。韩国的机场铁路有许多桥段，并且使用支线电缆来确保与斜线的绝缘距离。桥段是由两个楼层组成的复杂结构，下层的铁路段由与上层的隧道相似的结构组成。但是，底层的隔热设备已被雨，雪，隧道和自然景观等自然环境污染。较低的楼层更靠近诸如海洋之类的裸露位置，并且由于盐害而导致的降解率很高。在本文中，我们提出了一种方法来增加安装在盐分受损区域中的绝缘设备的预期寿命。因此，测量了安装在海桥上的馈电线的绝缘性能。通过应用加权平均值，可以在健康指数中显示生命周期评估。另外，通过考虑健康指数和剩余寿命来预测预期寿命。