The insulating material of the cross-linked cable is XLPE, the base material is PE+DCP (cross-linking agent) and other components, and the cross-linking process is to form a polyethylene (PE) material with a linear molecular structure through a specific processing method. Body-shaped cross-linked polyethylene with a net-like split line structure. The long-term allowable operating temperature is increased from 70°C to 90°C (or higher), and the short-circuit allowable temperature is increased from 140°C to 250°C (or higher). While maintaining its original excellent electrical performance, it has greatly improved Actual performance.
The cross-linking methods of cross-linked cables are divided into two categories: chemical cross-linking and physical cross-linking. The chemical crosslinking is divided into dry crosslinking and warm water crosslinking. Dry cross-linking is the cross-linking of polyethylene molecular chains in a high-pressure gas at a temperature of 300 to 400°C. In this state, the hydroxide decomposes into metal oxides and water, causing cracks and blisters on the cable surface. Therefore, the dry crosslinking method cannot be used for low-smoke halogen-free materials. The method of warm water crosslinking is to put the cable (generally voltage level 0.6/1kV) into 90° warm water and soak for 7-8h. Under this condition, the hydroxide will absorb a large amount of water, resulting in a decrease in insulation resistance. Will directly affect the overall performance of the cable. Physical cross-linking is radiation cross-linking. It uses an electron accelerator to disrupt the chain-like molecular structure and recombine it into a three-dimensional network molecular structure to form cross-links. This type of cross-linking is neither high temperature nor water, and will not affect Flame retardant and electrical properties, suitable for LSZH cable.
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 of the national standard. In addition, the radiation dose applied in the production process of radiation crosslinking leaves a great safety hazard from the destruction dose. In terms of product performance, the price of ordinary cross-linked cables is lower than that of irradiation crosslinking cables, while the latter is more expensive.
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