Description

Raychem Heat Shrink Straight Through Joints are cable jointing kits used to connect two power cables end-to-end while maintaining electrical continuity, insulation, mechanical strength, and environmental sealing. These joints are widely used in low-voltage (LV), medium-voltage (MV), and high-voltage (HV) power distribution systems for XLPE, PVC, rubber, and PILC cables.

Main Features :

• Heat-shrinkable insulating tubes and sleeves
• Excellent electrical insulation and stress control
• Moisture-proof and corrosion-resistant sealing
• Suitable for copper or aluminium conductors
• Fast and reliable installation
• High mechanical and thermal performance
• Suitable for armoured and unarmoured cables

Construction and Working :

The joint consists of several heat-shrinkable components that shrink tightly over the cable when heated. The system typically includes:

1. Mechanical or compression connector
2. Stress control tubing
3. Insulation tubing
4. Metallic shielding (copper mesh/springs)
5. Outer sealing sleeve with adhesive coating

When heat is applied, the tubing shrinks and the adhesive melts, forming a tight environmental seal around the cable joint. This prevents ingress of moisture, dust, and chemicals while restoring insulation and shielding properties.

Electrical Stress Control :

Raychem joints use specially designed stress-control tubing and patches to distribute the electric field uniformly across the connector and insulation screen ends. This minimizes partial discharge and improves long-term reliability, especially in medium-voltage applications.

Triple Extruded Elastomeric Technology :

A key feature of Raychem MV joints is the triple-layer joint body:

• Outer conductive layer
• Insulating layer
• Inner elastomeric layer

This design provides strong insulation, flexibility, and excellent thermal performance, allowing the joint to withstand thermal expansion and contraction during operation.

Applications :

Raychem Heat Shrink Straight Through Joints are used in:

• Underground cable networks
• Industrial power systems
• Utilities and substations
• Renewable energy projects
• Infrastructure and commercial installations
• Repair and extension of power cables

Advantages :

• Easy installation with standard tools
• Immediate energization after installation
• Long service life
• Excellent sealing against water and contaminants
• High short-circuit withstand capability
• Reduced maintenance requirements

Typical Voltage Ranges :

• LV joints: up to 1.1 kV
• MV joints: 11 kV, 22 kV, 33 kV
• Some designs available up to 42 kV

A Raychem Heat Shrink Straight Through Joint is a cable jointing system used to connect two power cables in a straight line while maintaining electrical continuity, insulation, moisture sealing, and mechanical protection. These joints are commonly used in low-, medium-, and high-voltage power distribution systems for XLPE, PVC, rubber, and polymeric insulated cables.