在电气化铁道供电系统中,电力机车通过受电弓从接触网导线获得电能。接触网是一个重量分布不均匀的弹性系统,在受电弓作用下,接触导线变形、震动并由此引起交替的应力变化。机车运行方式,取流状态等多种因素使接触导线既有机械磨耗又有电气磨耗。磨耗达到一定程度就有断线的危险。因此在不影响行车的情况下检测接触导线磨耗是铁路急需解决的重要课题,也是接触网检测项目中的难点。 In electrified railway power supply systems, electric locomotives receive electrical energy from the catenary wires through pantographs. Catenary is a non-uniform weight distribution of elastic system, under the pantograph contact wire deformation, vibration and thus cause alternating stress changes. Locomotive running mode, take the flow state and other factors make the contact wire both mechanical wear and electrical wear. Wear to a certain extent there is a danger of disconnection. Therefore, testing the contact wire wear without affecting the traffic is an urgent issue to be solved by the railway, and it is also a difficult point in the testing project of the catenary.