Description

Raychem Heat Shrink Medium Voltage (MV) Terminations are advanced cable accessories used to safely terminate medium-voltage power cables (typically 3.6 kV to 36 kV) to electrical equipment such as switchgear, transformers, and overhead lines.

Medium Voltage Heat Shrink Terminations-Conventional and next generation.

🔹 Description :

Raychem MV heat shrink terminations are pre-engineered kits made from specially formulated heat-shrinkable polymeric materials. When heat is applied, these materials shrink tightly over the cable, providing insulation, sealing, and electrical stress control at the cable end.

They are designed for both indoor and outdoor applications and suitable for single-core and multi-core cables with XLPE, EPR, or paper insulation.

🔹 Construction / Components :

A typical Raychem MV termination kit includes:

• Heat shrinkable insulating tubes
• Stress control tubes (resistive / ZnO-based)
• Anti-tracking outer tubes
• Breakout boots (for multi-core cables)
• Sealing mastic & adhesive components
• Cable lugs and connectors (optional)

These components are supplied as a complete kit for easy installation.

🔹 Working Principle :

The key function is electric field (stress) control at the cable end:

• When insulation is cut, electrical stress concentrates at the screen edge
• Raychem uses stress control technology (resistive or zinc oxide-based) to distribute the electric field uniformly
• Heat shrink tubes provide tight insulation and environmental sealing
• Result: prevents partial discharge, insulation failure, and flashover

🔹 Key Features :

1. Electrical Performance

• Suitable up to 36 kV systems
• Excellent dielectric strength (~10 kV/mm)
• Low partial discharge (<10 pC)
• Withstands impulse, AC, and DC voltage tests

2. Stress Control Technology

• Conventional: Resistive (impedance-based)
• Advanced: ZnO (zinc oxide) co-extruded stress control

3. Material Properties

• Non-tracking and UV-resistant outer layer
• Resistant to moisture, chemicals, and pollution
• Long-term reliability in harsh environments

4. Installation Advantages

• Heat shrink technology – simple and quick installation
• No special tools required
• Immediate energization after installation
• Pre-engineered kits reduce installation errors

5. Shelf Life & Maintenance

• Practically unlimited shelf life under normal storage
• Maintenance-free once installed

🔹 Standards & Testing :

Raychem MV terminations comply with major international standards:

• IEC 60502-4
• IEEE 48
• CENELEC HD 629
• IS 13573-2

They undergo tests such as:

• AC/DC withstand
• Impulse voltage
• Partial discharge
• Humidity & salt fog tests
• Load cycle testing

🔹 Applications :

• Power distribution networks
• Industrial plants
• Substations
• Renewable energy systems
• Underground cable terminations

🔹 Advantages Summary :

• Reliable long-term performance
• Excellent electrical stress control
• Easy and fast installation
• Suitable for wide cable ranges
• Compact and lightweight design

Conclusion

Raychem heat shrink MV terminations are highly reliable, field-proven cable accessories that ensure safe and efficient termination of medium-voltage cables. Their combination of advanced stress control technology, durable materials, and installation simplicity makes them one of the most widely used solutions in power distribution systems.