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The difference between cross-linked and non-cross-linked power cables
Release time:
2023-03-23
Different from cross-linked polyethylene insulated cables (XLPE), ordinary power cables have different structures, which can be reflected in the following aspects:
Different from cross-linked polyethylene insulated cables (XLPE), ordinary power cables have different structures, which can be reflected in the following aspects:
In terms of materials, the difference between cross-linked and non-cross-linked cables.
The temperature resistance level of non-cross-linked polyvinyl chloride (PVC) cables is generally 70 ° C,
XLPE insulated cable is a cross-linked polyethylene (XLPE) insulating dielectric material with a temperature resistance of 90°C.
In addition, non-crosslinked PVC will release toxic HCL fumes during combustion, and PVC cables cannot be used for low toxicity fire protection requirements.
The ampacity of cross-linked polyethylene insulated cables is greater than that of polyvinyl chloride cables under the same conductor cross-sectional area.
There are three types of XLPE cables.
Warm water cross-linking (the general voltage level is 0.6/1kV), which is characterized by simple equipment, but the warm water time is generally 7-8h, the production cycle is long, and the material price is low.
The second is natural cross-linking, which has the characteristics of one-time extrusion molding, but the cross-linking process needs to be placed in the environment for 4-8 days, and it is naturally cross-linked in the air.
The third is radiation cross-linking, which is characterized in that cross-linking needs to be carried out on specific equipment, but the cross-linking period is short, and the radiation dose required for large cross-section cables is relatively large.
Cross-linked polyethylene has the following advantages:
1. Heat resistance: XLPE has a network three-dimensional structure and has excellent heat resistance. The long-term working temperature can reach 90°C, the thermal life can reach 40 years, and there is no decomposition and carbonization.
2. Insulation performance: XLPE maintains the original good insulation performance of PE, and further increases the insulation resistance. The dielectric loss tangent is very small and is not greatly affected by temperature.
3. Mechanical properties: The hardness, stiffness, wear resistance and impact resistance of XLPE are all improved, because new chemical bonds are established between macromolecules, thus making up for the shortcomings of PE that are susceptible to environmental stress.
4. Chemical resistance: XLPE has strong acid and alkali resistance and oil resistance, and its combustion products are mainly water and carbon dioxide, which is less harmful to the environment and meets modern fire safety requirements.
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