Cable partial discharge detection method and device

Abstract

The invention relates to a cable partial discharge detection method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring the grounding end current of a metal sheath and the surface temperature of the metal sheath; when the state of the surface temperature of the metal sheath is an abnormal state, determining whether partial discharge occurs in the cable according to the state of the current of the grounding end, wherein the state of the current at the grounding end comprises an abnormal state or a normal state; and if the partial discharge occurs in the cable, determining the occurrence position or the discharge stage of the partial discharge of the cable according to the input current of the cable. By adopting the method, the detection flexibility and accuracy can be improved, and after the occurrence position / discharge stage of partial discharge is determined, a worker can take corresponding remedial measures conveniently so that emergency losses caused by cable partial discharge are reduced, and potential safety hazards caused by cable partial discharge are eliminated.

Description

technical field [0001] The present application relates to the field of electric power technology, in particular to a detection method and device for cable partial discharge. Background technique [0002] During the use of the cable, due to the inhomogeneity of the electric field distribution inside the insulating material wrapping the core or the presence of defects or impurities, the local electric field is concentrated, and where the electric field is concentrated, the insulating material breaks down or discharges along the surface of the insulating material. This kind of discharge only exists in the local position of the insulating material, and does not immediately form the breakdown or flashover of the entire insulation penetration, which is called partial discharge. [0003] The defect area in the early stage of partial discharge is small, which usually does not cause the overall insulation capacity of the cable external insulation material to decline, but as the parti...

AI Technical Summary

Problems solved by technology

[0004] In the traditional technology, the detection method of cable partial discharge is to use the phase information and amplitude information of different positions on the cable to determine whether there is partial discharge. The detection accuracy of this method is low and the effect is poor.

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