XLPE cable uses chemical or physical methods to convert thermoplastic polyethylene into thermosetting XLPE, so as to improve its heat resistance and mechanical properties. When the cable is damp or flooded, the moisture on the surface of the insulation layer or conductor will move along the direction of the electric field under the action of a strong electric field, causing a "water tree". The water tree ages the insulation and eventually leads to the aging and breakdown of the insulation.

The main reason for the damp of the cable is that the cable end caps and accessories (especially the intermediate joints when directly buried) are not tightly sealed or the cable sheath is damaged by external forces during the cable transportation or laying process. In addition, during the cable test or operation, the insulation of the cable sheath is broken down.

Protective measures:

1. Manufacturers are required to strictly control cable materials and manufacturing processes to minimize the presence of micropores and impurities.

2. Strictly check the cable end caps and interfaces during the process of laying and transporting the cables to prevent the cable interfaces from becoming loose and falling off. For high-voltage cables, use metal caps to seal them.

3. The cable trench cannot be stringed together with the heating trench. Before laying the cable, clean the cable trench and pipeline to remove the accumulated water, and take protective measures when laying.

From the selection of raw materials to the production of KUKA cable, they have gone through layers of checks. The technicians control every process and carry out repeated inspections in accordance with industry standards in every link to ensure that every meter of cable is of high quality.