Difference between irradiated cross-linked cables and ordinary cables

The insulating material of cross-linked cable is XLPE, the base material of which is PE + DCP (cross-linking agent) and other components, while the cross-linking process is through the linear molecular structure of the polyethylene (PE) material through a specific processing method, so that the formation of a body-shaped mesh divided line structure of cross-linked polyethylene. So that the long-term allowable working temperature from 70 ℃ to 90 ℃ (or higher), short-circuit allowable temperature from 140 ℃ to 250 ℃ (or higher), in keeping with its original excellent electrical properties under the premise of greatly improving the actual performance. Cross-linked cable cross-linking is divided into three types, one is warm water cross-linking (general voltage level at 0.6/1kV), characterized by simple equipment, but the warm water boiling time is generally in the 7-8h, the production cycle is long, and the material price is cheap. The second is natural cross-linking, characterized by a single extrusion molding, but the cross-linking process needs to be placed in the environment for 4-8 days, natural cross-linking in the air. The third is irradiation cross-linking, characterized by cross-linking needs to be carried out in specific equipment, but the cross-linking process cycle is short, large cross-section cables need to irradiation dose is relatively large. But regardless of which crosslinking method, the result of crosslinking is the crosslinked cable thermal extension in line with the standard performance requirements. In addition, the irradiation crosslinking production process applied in the irradiation dose from its destructive dose to leave a large margin of safety. Polyethylene radiation damage dose of 1000KGY, while the processing dose of about 200KGY, coupled with a special formula to improve, in a fairly wide range is still subject to radiation crosslinking state, so in the longer pre-use of the process of radiation and its performance will be improved. In terms of product performance, ordinary crosslinked cable and irradiated crosslinked cable compared to the former price is low, the latter price is high (mainly processing equipment is not the same as the price of raw materials there are differences), product performance of the two can be said to be on a par.

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