Water-blocking swellable tape is a specialized type of tape used in high-voltage power cable systems to prevent the ingress of water into the cable. It is designed to swell when exposed to water, creating a barrier that prevents water from penetrating the cable and causing damage to the insulation.
The tape typically consists of a non-woven fabric or plastic film coated with a water-swelling material, such as a superabsorbent polymer. When the tape comes into contact with water, the water-swelling material absorbs the water and swells, creating a barrier that prevents further water from entering the cable.
Water-blocking swellable tape is commonly used in high-voltage power cable systems, including underground and submarine power cables, as well as in overhead transmission lines. It is typically applied in multiple layers and is used in conjunction with other types of cable accessories, such as joints and terminations, to ensure the safe and reliable operation of the cable system in wet or humid environments.
It’s worth noting that water-blocking swellable tape is not designed to provide electrical insulation or conductivity, and it is typically used in conjunction with other types of tape, such as semi-conductive cushion tape, to provide a complete cable protection system.