Insulation Barriers For High-voltage Power Systems: Cold-shrink Cable Accessory Technology

Power cable systems are subject to environmental stresses during long-term operation. Silicone rubber is the mainstream choice due to its high elasticity and weather resistance.

Silicone Rubber Material and Electric Field Stress Control

High-modulus liquid silicone rubber is injection molded during the factory prefabrication stage. The material's internal molecular structure is dense, providing excellent resistance to electrical breakdown. The continuous radial pressure generated by cold-shrink cable accessories after installation ensures a tight interface. This pressure originates from the physical elastic memory of the rubber and does not significantly decrease over time. Air between interfaces is completely expelled, creating a vacuum-like sealed environment.

Long-term stability of insulation interface performance

Cold Shrink Cable Accessories has excellent electrical insulation properties. Its design element lies in the geometric fit between the stress cone and the insulation layer. This fit optimizes the electric field distribution at the cable end, reducing the probability of partial discharge.

• Hydrophobicity: Water droplets on the silicone rubber surface are discontinuous, blocking the formation of conductive channels.

• Creepfastness: A special formula enhances the resistivity of the insulation surface in humid environments.

• Temperature Adaptability: Maintains stable physical properties within a temperature range of -50°C to 150°C.

Industrial-grade cold-shrink cable accessories undergo rigorous high-voltage cycling tests. Their sealed structure prevents atmospheric moisture infiltration, maintaining internal electrical strength. This physical structure supports the cable termination under extreme loads. Cold-shrink cable accessories utilize pre-stressed expansion technology, allowing for on-site shrinkage without a heat source. The material itself has extremely low dielectric loss, resulting in minimal heat accumulation over extended operation. Through molecular modification technology, the insulation layer exhibits exceptional anti-aging capabilities, meeting the long-term lifespan requirements of the power grid.