Question

What is the allowable operating temperature of XLPE cable?
1. 90°C
2. 60°C
3. 70°C
4. 50°C

Answer 1

Correct Answer - Option 1 : 90°C

Cross-Linked Polyethylene (XLPE) Cable:

• Cross-linked polyethylene is actually a thermoset insulation material.
• The process changes the molecular structure of the polymer chains so that they are more tightly bound together is called crosslinking of polymers.
• And this cross-linking is done either by chemical means or physical means.
• In the chemical crosslinking process the addition of chemicals or initiators such as silane or peroxide generates free radicals that form the crosslinking.
• The cross-linked polyethylene (XLPE) material itself has excellent dielectric strength, high insulation resistance, and a low dissipation factor at all frequencies making it an ideal insulator.
• Cross-linking the PE to become XLPE increases the temperature range of the insulation whilst maintaining the electrical properties.
• XLPE is suitable for voltage ranges from low to extra-high voltage.
• Cross-linking the polyethylene also enhances the chemical and oil resistance at elevated temperatures.
• The mechanical properties of the XLPE are superior to many other insulations, offering greater tensile strength, elongation, and impact resistance.
• Improved water-tree resistance is another benefit of XLPE insulation.
• It is also having high thermal dissipation property compared to other cables.
• The allowable operating temperature of XLPE cable 90°C