The DC power feeder for railway electrification usually consists of multiple parallel cables for handling high current as well as for redundancy design. A non-intrusive condition monitoring of the DC feeder is proposed for early detection of defects related to poor electrical contact due to ageing and corrosion, as well as accidental damage. The proposed method adopts an inductive coupling approach without direct electrical contact, which extracts the impedance of the DC feeder when it is still energized under its usual operating condition. By correlating the measured impedance of the feeder to the impedance of the equivalent feeder circuit, the defective cable can be identified and replaced.

中文翻译：

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多条并联电缆大功率直流馈线状态监测

铁路电气化直流馈线通常由多条并联电缆组成，用于处理大电流以及冗余设计。建议对直流馈线进行非侵入式状态监测，以便及早检测与由于老化和腐蚀以及意外损坏导致的电气接触不良相关的缺陷。所提出的方法采用无直接电接触的电感耦合方法，提取直流馈线在其通常工作条件下仍通电时的阻抗。通过将测得的馈线阻抗与等效馈线电路的阻抗相关联，可以识别和更换有缺陷的电缆。