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Heat-Shrinkable Cable Accessories
Heat-shrinkable cable accessories, including medium voltage cable terminations and medium voltage cable joints, are essential components for sealing, insulating, and protecting cable connections in electrical systems. Designed for cross-linked polyethylene (XLPE) and oil-immersed cables with voltage ratings spanning 0.6/1 kV to 35 kV, these accessories utilize advanced polymer materials that contract radially when heated, forming a secure, waterproof, and corrosion-resistant seal. Widely adopted in power distribution, industrial installations, and renewable energy systems, they offer superior performance over traditional methods like tape-wrapping or cold-shrink systems, with advantages such as compact size, lightweight design, rapid installation, and long-term reliability.
Heat-shrinkable cable accessories comply with stringent international and regional standards to ensure safety and performance across voltage levels:
IEC 60502: Power cables with extruded insulation for rated voltages from 1 kV to 30 kV
IEEE 404: Standard for Extruded and Laminated Dielectric Shielded Cable Joints
IEC 60840: Power cables with extruded insulation for rated voltages above 30 kV up to 150 kV (for 25/36 kV systems)
ASTM D2671: Test Methods for Heat-Shrinkable Tubing for Electrical Insulation
BS EN 50393: Test requirements for accessories for power cables
GB/T 12706: Chinese standard for extruded insulated power cables
These certifications ensure compatibility with global electrical infrastructure and adherence to mechanical, thermal, and electrical requirements.
Medium voltage cable terminations and joints are engineered with precision to handle varying voltage levels (0.6/1 kV to 35 kV). Key components include:
Stress Control Layer:
Manages electrical stress at termination points, critical for 6/10 kV, 8.7/15 kV, and 18/30 kV systems.
Made from semi-conductive heat-shrink tubes or stress cones.
Insulation Layer:
Primary dielectric barrier using polyolefin or EVA (ethylene-vinyl acetate).
Thickness varies based on voltage (e.g., thicker for 25/36 kV applications).
Sealing System:
Inner adhesive liner (hot-melt glue) activated during heating for moisture and contaminant exclusion.
Shielding Restoration (for shielded cables):
Conductive tapes or braids to maintain cable shielding continuity in joints.
Outer Protection:
UV-resistant, flame-retardant sleeves for mechanical durability.
Key specifications for heat-shrinkable accessories across voltage classes:
| Voltage Class | Rated Voltage (U/U) | Application |
|---|---|---|
| Low Voltage | 0.6/1 kV | Building wiring, small motors |
| Medium Voltage | 6/10 kV, 8.7/15 kV | Industrial plants, distribution |
| 12/20 kV, 18/20 kV | Wind farms, substations | |
| 18/30 kV, 25/36 kV | High-demand networks, rail systems |
General Performance Data:
Operating Temperature: -40°C to +105°C
Shrink Ratio: 2:1 to 3:1 (radial contraction)
Dielectric Strength: ≥25 kV/mm
Tensile Strength: ≥12 MPa
Flame Resistance: UL94 V-0, IEC 60332-1
Waterproof Rating: IP68
A standard kit for medium voltage cable terminations or joints includes:
Heat-shrink tubes (pre-cut for specific voltage classes)
Stress control components (tubes, cones)
Mastic sealing tapes and adhesive-lined sleeves
Shielding restoration kits (for 12/20 kV and above)
Cleaning supplies (abrasive paper, alcohol wipes)
Installation manual with voltage-specific guidelines
Voltage-Specific Design:
Tailored layers for 0.6/1 kV to 25/36 kV systems.
Enhanced Safety:
Uniform insulation and stress control prevent partial discharges in 8.7/15 kV and 18/30 kV systems.
Adaptability:
Compatible with round, flat, or irregular cable surfaces.
Environmental Resistance:
UV, chemical, and oil resistance for outdoor/industrial use.
Quick Installation:
Shrinks within minutes using a heat gun or torch.
Medium voltage cable terminations and joints are critical in:
Power Distribution:
Terminating 6/10 kV and 12/20 kV cables in substations.
Renewable Energy:
Connecting 18/30 kV wind turbine cables.
Industrial Facilities:
Jointing 8.7/15 kV motor feeder cables.
Transportation:
Rail electrification (25/36 kV systems).
Oil & Gas:
Hazardous area installations (ATEX-certified).
Packaging:
Components vacuum-sealed in anti-static, moisture-proof bags.
Kits labeled with voltage ratings (e.g., 18/20 kV or 25/36 kV).
Storage:
Shelf life: 5 years in dry, cool (<30°C) conditions.
Shipping:
Non-hazardous; bulk orders shipped in wooden crates.
Medium voltage cable terminations and joints using heat-shrink technology provide a reliable, cost-effective solution for modern electrical networks. Their ability to accommodate voltages from 0.6/1 kV to 25/36 kV, combined with compliance to global standards, makes them indispensable for utilities, industries, and infrastructure projects. For engineers prioritizing safety, efficiency, and durability, heat-shrinkable accessories deliver unmatched performance across diverse applications.
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