近年来，高速铁路各项技术不断发展，列车运行速度从300 km•h–1 提高到400 km•h⁻¹。本文介绍了由韩国研究者开发和论证的技术，即400 km•h⁻¹ 级集电性能评估方法。此外，本文还详细解释了基于视频图像的监测技术，其不需要直接接触供电系统的任何部件，这项技术被应用于检测以时速400 km 运行的高铁上架空接触网组件的稳定性。与常规使用激光传感器或者线相机(line camera)来监控架空接触网的系统不同，开发的新型系统通过视频数据来测量其处于活动状态的参数。根据在商业线路上实地测量的结果，这种系统能有效地测量架空接触网的各项参数。

Various technologies have recently been developed for high-speed railways, in order to boost commercial speeds from 300 km·h⁻¹to 400 km·h⁻¹. Among these technologies, this paper introduces the 400 km·h⁻¹ class current collection performance evaluation methods that have been developed and demonstrated by Korea. Specifically, this paper reports details of the video-based monitoring techniques that have been adopted to inspect the stability of overhead contact line (OCL) components at 400 km·h⁻¹ without direct contact with any components of the power supply system. Unlike conventional OCL monitoring systems, which detect contact wire positions using either laser sensors or line cameras, the developed system measures parameters in the active state by video data. According to experimental results that were obtained at a field-test site established at a commercial line, it is claimed that the proposed measurement system is capable of effectively measuring OCL parameters.