On-site Repair Method for Deformation Defects of Metal Sheath of High Voltage and Ultra High Voltage XLPE Cables

Abstract

The invention provides an on-site repair method for deformation defect of a metal sleeve of a high-pressure / ultrahigh-pressure crosslinking cable. The on-site repair method comprises the steps of 1, measuring minimum diameter B of an external sheath of the high-pressure / ultrahigh-pressure crosslinking cable; 2, shooting X light transmission image of a cross section with the minimum diameter B, and judging whether the gap size between the metal sleeve and an insulation layer is larger than a set gap value or not according to the X light transmission image, if yes, considering that the metal sleeve has the defect, and repairing the metal sleeve according to the step 3; and 3, extruding the external sheath along a direction of maximum diameter A of the high-pressure / ultrahigh-pressure crosslinking cable so that the maximum diameter A and the minimum diameter B of the high-pressure / ultrahigh-pressure crosslinking cable are within a set diameter range.

Description

technical field [0001] The invention belongs to the technical field of condition maintenance of power cables, and relates to an on-site repair method for deformation defects of metal sheaths of high-voltage and ultra-high-voltage cross-linked cables. Background technique [0002] The high-voltage and ultra-high-voltage cross-linked cable lines running in the urban power grid are damaged by third-party external forces due to external factors such as urban construction exploration and infrastructure construction, which often lead to damage to the cable body, resulting in concentrated defects of outer sheath concave deformation, which makes the outer sheath of the cable The gap between the internal insulation shield and the corrugated aluminum sleeve at the deformed position is smaller than the corresponding internal gap of the normal, undeformed cable. Considering that the cable will run under load after it is put into operation, the insulation layer and conductor core will ex...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above problems, the present invention provides an on-site repair method for deformation defects of the metal sheath of high-voltage and ultra-high-voltage cross-linked cables, which can quickly and effectively address the sudden situation of the deformation defect of the metal sheath caused by the damage of the third-party external force of the cable line in operation. The deformation defect of the metal sheath can be repaired accurately, and the external force correction only acts on the outer sheath and the metal sheath. After the repair, the main insulation and insulation shielding of the cable still maintain the normal shape, which effectively avoids the sudden insulation during operation due to the deformation defect of the cable outer sheath. Breakdown power outage accidents save the cost of emergency repairs where the defective cable can only be replaced as a whole because the deformation defect of the outer sheath cannot be eliminated

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