Methods for Handling Damage to the Outer Sheath of High-Voltage Cables
Dec 26,2022
When a high-voltage cable is damaged, it should be repaired only after confirming that there is no internal damage to the cable. Otherwise, repairing the cable’s outer jacket will not have much practical significance. It is crucial to repair the cable promptly; otherwise, over time, the ingress of external moisture and humidity could compromise the cable’s normal service life.
Methods for Handling Damage to the Outer Sheath of High-Voltage Cables
After the insulation layer of a high-voltage cable is damaged, if the depth of the damage reaches or exceeds 10% of the insulation layer’s thickness, insulation reinforcement treatment should be carried out. When repairing the insulation, first clean away any dirt from the damaged area, and then use self-adhesive insulating tape to perform the repair. During wrapping, be sure to take precautions against dust and water.
When wrapping self-adhesive tape around high-voltage cables, the overlap pressure between adjacent layers of insulating self-adhesive tape should be half the width of the tape. The repair thickness must exceed the depth of the damage in the insulation layer and shall not be less than two layers; for areas with severe damage, the number of repair layers must be at least five. The length of the repair extension at each end of the repaired area should be 20 millimeters. Alternatively, a specialized insulating shielding cover can be used to cover the damaged portion of the wire’s insulation layer, and the open ends should be sealed tightly with insulating adhesive tape.
Within the same span, the number of repair locations on the insulation layer of a single high-voltage cable conductor shall not exceed three. When stripping the insulation and semiconductor layers from the conductor, special tools must be used to avoid damaging the conductor itself. The insulation and core at the cut edges shall be chamfered at a 45° angle. All contact ends, joints, and cut edges of the insulated conductors must be properly insulated and protected; no wires or connections should be exposed to prevent water ingress.
The damaged sections during cable laying are random. To reduce related costs and quickly resolve issues, a key factor is ensuring sufficient staffing during cable installation. Regular cable-laying operations should employ standardized cable-laying equipment to prevent and minimize jacket damage during the cable-laying process. During the operation of high-voltage cables, it is essential to strengthen maintenance and inspection along the cable routes.
All the tools and materials required for on-site cable repair have been fully prepared. Sealing materials—including high-voltage cable insulation tape, waterproof tape, and outer sheaths stripped from plastic insulation and jackets—are also ready. This is because cable insulation and jacket materials are primarily categorized into cross-linked polyethylene, polyethylene, and polyvinyl chloride, among others.
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