Method and device for detecting damage of semi-conductive shielding layers of medium- and high-voltage cables

The invention relates to a technology for detecting the quality of cables, in particular to a method and a device for detecting the damage of semi-conductive shielding layers of medium- and high-voltage cables. The method comprises the following steps that: photoelectric sensors are used for emitting detection rays to sweep a dark semi-conductive shielding layer of a cable; when part of a light-colored cable core covered by the semi-conductive shielding layer of the cable is exposed due to the damage of the semi-conductive shielding layer of the cable, the detection rays are reflected into the photoelectric sensors; and the photoelectric sensors send detection signals. The structural characteristics of the cables are ingeniously utilized; an ideal detection effect can be achieved by using the simple photoelectric sensors; the technical gap that the damage of the semi-conductive shielding layers of the medium- and high-voltage cables is detected by using automatic detection equipment in the field is filled; and the device is simple in structural composition and relatively low in cost, has a good effect, is convenient to use, and can be popularized.