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

Abstract

The invention discloses a defect detection method, device, equipment and medium of a cable wrinkled metal sheath. The method includes: obtaining the specification parameters of the cable wrinkled metal sheath; measuring the total DC resistance value of the wrinkled metal sheath, and collecting environmental Temperature: According to the total DC resistance value, ambient temperature, preset reference temperature, temperature coefficient of resistance, total length and wrinkle pitch, calculate the DC resistance value of the corrugated metal sheath within a single wrinkle pitch at the preset reference temperature; Obtain the inner surface arc equation of the corrugated metal sheath in the cylindrical coordinate system; calculate the corrugated metal sheath according to the inner surface arc equation, the DC resistance value within a single wrinkle pitch, the inner minimum radius, the wrinkle pitch and the radial thickness Set the conductivity at the preset reference temperature; compare the conductivity with the preset conductivity threshold to obtain the defect detection result. The embodiment of the invention can accurately detect the defects of the cable corrugated metal sheath.

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 a cable corrugated metal sheath. Background technique [0002] The corrugated metal sheath is an important part of the high-voltage power cable, which undertakes many key tasks such as improving the mechanical strength of the cable, realizing the radial water resistance of the cable, and ensuring the good grounding of the cable shielding layer. The size and electrical conductivity of the corrugated metal sheath are the keys to ensure electrical performance. At present, due to the lack of an effective method for detecting the electrical conductivity of the corrugated metal sheath, the performance testing of the corrugated aluminum sheath in the material inspection stage of the power grid company mainly stays in the aspect of thickness. Therefore, how to accurately detect the defects of the corrugated metal sheath is ...

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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