XLPE:
XLPE is an abbreviation for Cross-linked polyethylene or vulcanized
polyethylene. The basic material is low-density polyethylene.
Polyethylene is a thermoplastic material consisting of long chains of
hydrocarbon molecules. Cross-linking of Polyethylene takes place in
a three-dimensional network. As such, XLPE has strong resistance to
deformation of higher temperature. XLPE is a non polar material which
possesses high insulation resistance and dielectric strength and low
dielectric loss.
Advantages of XLPE:
Due to excellent electric thermal, mechanical and chemical
properties of XLPE; these cables are widely used by the customers
replacing the conventional cables using PVC as insulating material. The
various advantages of XLPE cables are given below.
- Higher current ratings: It is possible to use one lower size of cable as compared to PVC.
- Higher emergence overload withstand capacity. It can withstand
overload temperature up to 130°C because of better ageing properties
and resistance to deformation under load.
- Higher short circuit rating: XLPE can withstand short circuit temperatures up to 250°C whereas PVC cables can only withstand up to 160°C.
- Enhanced life because dielectric losses are very small.
- Jointings and terminations are very easy.
- XLPE cables are not prone to fatigue damage due to vibrations or loading cycles.
- Easy handling during installation because these cables are lighter in weight.
- XLPE cables retain their flexibility down up to 40°C.
- No elevation limit.
- Better resistance to most chemicals such as ordinary acids, bases and oils.
- PVC cables have distinct disadvantages regarding environmental
protection. If they burn, they gives off corrosive gases. Although XLPE
also burns, but the combustion products- carbon dioxide and water, do
not cause a damage. Moreover, it does not melt like Polyethylene.
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