24kV Heat Shrinkable 3 Cores Straight Through Joint Kits: Driving Innovation in Medium-Voltage Cable Connection Technology

Technological advancements in power distribution are continuously improving the reliability and efficiency of power grids, with cable connection technology playing a crucial role.

In the medium-voltage distribution network sector, 24kV Heat Shrinkable 3 Cores Straight Through Joint Kits have become an important choice for grid operators and cable installers. These products are specifically designed for connecting 24kV three-core polymer-insulated cables, providing reliable insulation protection, stress control, and environmental sealing performance through heat-shrink technology. They are suitable for various installation environments, including direct burial and cable trenches.

01 Product Technical Features The heat-shrinkable 3 Cores Straight Through Joint Kits are manufactured using advanced polymer materials that radially shrink upon heating, tightly wrapping the cable connection to form a multi-layered protective system.

The product can operate stably within a temperature range of -50°C to 105°C, with an aging life of up to 20 years, ensuring long-term operational reliability.

Key components include stress control tubing, double-wall heat shrink tubing, sealant, copper mesh screen, and integrated protective tubing, collectively forming a complete cable connection solution.

This design effectively controls the electric field distribution, improves electrical stress, and provides excellent insulation performance and waterproof protection, enabling cable joints to operate normally in humid environments and even under complete immersion conditions.

02 Electrical Performance Standards

The electrical performance of the 24kV heat shrinkable three-core straight-through junction box has undergone rigorous testing and meets international standards.

Typical test parameters include dry-type power frequency withstand voltage test 54kV (81kV)/5 minutes, impulse voltage test 125kV 1.2/50μ+10 times, and partial discharge test ≤10pc (1.73Uo).

These products meet the requirements of international standards such as CENELEC HD 629.2 and IEC 60502-4, ensuring compatibility and applicability in different regions.

Products from brands such as Nexans, 3M, and Ensto undergo factory AC withstand voltage testing before being released to the market.

03 Applications and Advantages

These junction boxes are suitable for XLPE insulated three-core power cables with voltage ratings of 12/20kV, 12.7/22kV, and 18/30kV.

The products cover a wide range of conductor cross-sectional areas (e.g., 25-400mm²), meeting the needs of most medium-voltage cable networks.

Ease of installation is one of the significant advantages of heat-shrinkable junction boxes. Their compact design allows for flexible installation even in space-constrained environments.

Compared to traditional connection methods, heat-shrink technology requires no special tools; installation is completed simply by heating, and the system can be powered on immediately after installation, significantly reducing construction time and downtime.

04 Market Development and Prospects

With increasing global investment in power infrastructure, the medium-voltage cable accessories market continues to grow. Heat-shrinkable junction boxes have gained widespread market acceptance due to their high reliability, ease of installation, and low maintenance costs.

Major manufacturers are continuously investing in research and development to improve product performance.

For example, some manufacturers have launched triple-structure heat shrink tubing, integrating multiple functions into a single component, simplifying the installation process and reducing the number of parts.

The use of environmentally friendly halogen-free materials is also becoming increasingly widespread, meeting the higher requirements of the modern power industry for safety and environmental friendliness.

In the future, with the increasing demand for smart grid construction and renewable energy integration, 24kV heat shrinkable three-core straight-through junction boxes will continue to evolve, providing more efficient and reliable connection solutions for distribution networks.

The power industry's ever-increasing demands for reliability and safety are driving continuous innovation in cable connection technology.

As a key component of medium-voltage distribution networks, the technological advancement of 24kV heat shrinkable three-core straight-through junction boxes will directly impact the grid's operational efficiency and power supply reliability.

In the future, with the development of materials science and the optimization of installation processes, these products will continue to develop towards greater efficiency and environmental friendliness, providing solid support for the upgrading and transformation of global power infrastructure.