Defect detection method, device and equipment for cable corrugated metal sheath and medium

Abstract

The invention discloses a defect detection method, device and equipment for a cable corrugated metal sheath and a medium. The method comprises the following steps: acquiring specification parameters of the cable corrugated metal sheath; measuring the total direct current resistance value of the corrugated metal sheath, and collecting the environment temperature; according to the total direct current resistance value, the environment temperature, the preset reference temperature, the resistance temperature coefficient, the total length and the wrinkled pitch, the direct current resistance value of the wrinkled metal sheath in a single wrinkled pitch at the preset reference temperature is calculated; acquiring an inner side surface arc equation of the corrugated metal sheath under a cylindrical coordinate system; calculating the conductivity of the corrugated metal sheath at the preset reference temperature according to the inner side surface arc equation, the direct current resistance value in a single corrugated pitch, the inner side minimum radius, the corrugated pitch and the radial thickness; and comparing the conductivity with a preset conductivity qualified threshold value to obtain a defect detection result. According to the embodiment of the invention, the defect condition of the corrugated metal sheath of the cable can be accurately detected.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a defect detection method, device, equipment and medium for cable corrugated metal sheaths. Background technique [0002] Corrugated metal sheath is an important part of high-voltage power cables, and it undertakes many key tasks such as improving the mechanical strength of cables, realizing radial water resistance of cables, and ensuring good grounding of cable shielding layers. The size and electrical conductivity of the corrugated metal sheath are the key to ensuring electrical performance. At present, due to the lack of effective detection methods for the conductivity of the corrugated metal sheath, the performance detection of the corrugated aluminum sheath in the material inspection stage of the power grid company mainly stays in the thickness. Therefore, how to accurately detect the defects of the corrugated metal sheath is of great significance to the safe and reliab...

AI Technical Summary

Problems solved by technology

The size and electrical conductivity of the corrugated metal sheath are the key to ensuring electrical performance. At present, due to the lack of effective detection methods for the conductivity of the corrugated metal sheath, the performance detection of the corrugated aluminum sheath in the material inspection stage of the power grid company mainly stays in the thickness. The detection of the corrugated metal sheath, but the detection of the conductivity performance of the corrugated metal sheath is rarely carried out. Therefore, how to accurately detect the defects of the corrugated metal sheath is of great significance to the safe and reliable operation of the power system.

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