The difference between XLPE insulation and PE insulation of Aerial Bundled Cable (ABC Cable)

Aerial Bundled Cables (ABC) are widely used in overhead power distribution systems. The insulation material plays a crucial role in their performance. The two common insulation materials used are Cross-Linked Polyethylene (XLPE) and Polyethylene (PE). Here, we would like to explain the important difference between them.

1.Thermal Properties

XLPE (Cross-Linked Polyethylene):

-Can withstand higher temperatures (typically up to 90°C continuously, and 250°C short-circuit conditions).

-Cross-linking improves thermal stability, making it suitable for higher load applications.

PE (Polyethylene)

- Lower thermal resistance, typically rated up to 70°C continuously.
- Can soften or deform at higher temperatures.

2.Mechanical Strength

XLPE:

- Higher tensile strength and resistance to cracking.
- Better resistance to environmental stress and mechanical wear.

- PE:

- Softer and less resistant to mechanical stress.
- More prone to deformation under load.

3.Chemical & Environmental Resistance

XLPE:

- Excellent resistance to moisture, chemicals, and UV radiation.
- More resistant to treeing (electrical degradation).

PE:
- Good moisture resistance but less resistant to chemical and UV degradation.
- More susceptible to electrical treeing over time.

4.Electrical Properties

XLPE:
- Lower dielectric losses, better insulation properties.
- Higher dielectric strength, suitable for medium-voltage applications.

PE:
- Adequate for low-voltage applications but has higher dielectric losses compared to XLPE.

5.Longevity & Durability

XLPE:

- Longer lifespan due to superior resistance to heat, oxidation, and environmental factors.

PE:

- Shorter lifespan, especially in harsh conditions.

6.Cost & Application

XLPE:

- More expensive but offers better performance for demanding applications.
- Preferred for medium-voltage ABC and harsh environments.

PE:
- Cheaper but used mainly in low-voltage ABC where thermal and mechanical stresses are lower.

Conclusion

- XLPE is superior in terms of thermal stability, mechanical strength, and long-term reliability.
- PE is cost-effective but suitable only for less demanding applications.

For most modern ABC systems, XLPE is the preferred choice due to its enhanced durability and performance. However, PE may still be used in low-cost or low-stress installations.


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