What are the Benefits of Using XLPE Insulated Cables?

1. Enhanced Thermal Properties:

XLPE, or Cross-Linked Polyethylene, is a thermoset insulation material known for its superior thermal capabilities. The process of crosslinking alters the molecular structure of polyethylene, making the polymer chains more tightly bound. This can be achieved through chemical methods, such as adding silane or peroxide to create free radicals that form crosslinks, or through physical methods, such as exposing the polymer to high-energy electron beams or microwave radiation. While polyethylene itself has excellent dielectric strength, high insulation resistance, and a low dissipation factor across frequencies, its temperature range is limited. Crosslinking transforms PE into XLPE, expanding its temperature tolerance while maintaining its electrical properties.

2. Electrical Performance:

XLPE is suitable for a wide range of voltage applications, from low to extra high voltage, outperforming other insulation materials like PVC, Ethylene Propylene Rubber (EPR), and silicone rubbers. This crosslinking process also enhances the material’s resistance to chemicals and oils, even at elevated temperatures, making XLPE an excellent Low Smoke Zero Halogen (LSZH) material.

3. Mechanical Strength:

The mechanical properties of XLPE are superior to many other insulation materials. It offers greater tensile strength, elongation, and impact resistance. Adding carbon black to XLPE can further enhance its resistance to hot deformation and cutting. Unlike some other insulations, XLPE will not melt or drip at high temperatures, such as those encountered with soldering irons. It also has increased flow resistance and improved aging characteristics.

4. Water-Tree Resistance:

One of the significant advantages of XLPE over regular polyethylene (PE) insulation is its improved resistance to water treeing. Water treeing is a defect that results from imperfections in the insulation, where fracture lines develop and grow in the direction of the electric field, exacerbated by electrical stress. XLPE's enhanced structure significantly reduces the occurrence of water treeing, making it a reliable choice for low voltage (LV) and medium voltage (MV) cables.

Comparison with PVC Insulation

• Thermal Range: XLPE handles a broader range of temperatures compared to PVC.

• Voltage Suitability: XLPE is ideal for applications ranging from low to extra high voltage, whereas PVC is generally used for lower voltage applications.

• Chemical Resistance: XLPE provides better resistance to chemicals and oils, especially at higher temperatures.

• Mechanical Durability: XLPE exhibits superior tensile strength, elongation, and impact resistance.

• Fire Safety: XLPE, especially when used as LSZH material, offers better fire resistance without producing harmful smoke and gases.

Conclusion

XLPE insulated cables provide numerous benefits, including excellent thermal and electrical properties, superior mechanical strength, and enhanced resistance to water treeing and chemical exposure. These attributes make XLPE a versatile and reliable choice for various industrial and commercial applications, ensuring long-lasting performance and safety.