The insulation material of the cross-linked cable is XLPE, and its base material is PE+DCP (cross-linking agent) and other components, and the cross-linking process is to pass the linear molecular structure polyethylene (PE) material through a specific processing method. Make it into a cross-linked polyethylene with a body-shaped network of sub-line structure. The long-term allowable operating temperature is increased from 70℃ to 90℃ (or higher), and the short-circuit allowable temperature is increased from 140℃ to 250℃ (or higher), which greatly improves on the premise of maintaining its original excellent electrical performance. Actual performance.

The cross-linking methods of cross-linked cables are divided into three types. One is warm water cross-linking (generally the voltage level is 0.6/1kV), which is characterized by simple equipment, but the boiling time of warm water is generally 7-8h, and the production cycle Long, cheap material. The second is natural cross-linking, which is characterized by one-time extrusion molding, but the cross-linking process needs to be placed in the environment for 4-8 days and naturally cross-linked in the air. The third type is irradiation cross-linking, which is characterized in that cross-linking needs to be carried out on specific equipment, but the cross-linking process cycle is short, and the radiation dose of large-section cables needs to be relatively large. But no matter which cross-linking method is adopted, the result of cross-linking is that the thermal extension of the cross-linked cable meets the performance requirements in the national standard. In addition, the radiation dose applied during the irradiation cross-linking production process has a great safety margin from its destruction dose. The radiation damage dose of polyethylene is 1000KGY, and the processing dose is about 200KGY, plus the improvement of special formula, it is still crosslinked by radiation in a relatively wide range, so its performance will be affected by radiation during a long period of early use. improve.

In terms of product performance, ordinary cross-linked cables have lower prices than irradiated cross-linked cables, while the latter have higher prices (mainly due to different processing equipment and different raw material prices). Product performance can be both Say nothing.