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Cross-linked cables usually refer to the use of cross-linked materials for the insulation of the cable. The most commonly used material is cross-linked polyethylene (XLPE). The cross-linking process is a linear molecular structure of polyethylene (PE) material through a specific processing method to form a cross-linked polyethylene body-shaped network structure. The long-term allowable working charge 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), greatly improving the premise of maintaining its excellent electrical performance. Actual use performance.
Cross-linked cable characteristics The aging life of cable insulation material mainly depends on its heat aging life, which is determined by the speed of chemical reactions such as thermal oxidation, thermal cracking, thermal oxidative cracking, polycondensation, etc. occurring in the insulation material under hot working. Therefore, the heat aging life of the insulation material directly affects the service life of the cable. The long-term allowable working temperature of the irradiated cross-linked cable (20-30 years) measured by chemical reaction kinetic derivation and artificial accelerated thermal aging test is:
1. Power cable YJV0.6/1KV116°C
According to the rated working temperature of 105 °C derived, the heat aging life of more than 60 years.
Deduced at a rated operating temperature of 90°C, its heat aging life exceeds 100 years.
2. Overhead insulated cable JKLYJ10KV122°C
Overhead aerial cables are laid in the open air, and the environment resistance and radiation resistance of the insulating materials are more important. Irradiation cross-linked insulation materials are subjected to irradiation processing, which itself has a good ability to withstand radiation. The irradiation dose applied in the cross-linked production process leaves a large safety margin from its destruction dose. The radiation damage dose of polyethylene is 1000KGY, and the processing dose is about 200KGY. Combined with the special formula improvement, it is still radiation-crosslinked within a fairly wide range. Therefore, the radiation performance of a long-term pre-use process will be somewhat reduced. improve. 
What is the process performance of the crosslinked cable?
Currently, the technical methods for producing cross-linked cables in the cable industry are divided into three categories: The first type of peroxide chemical cross-linking includes saturated vapor cross-linking, inert gas cross-linking, molten salt cross-linking, and cross-linking of silicone oil. Two kinds of dry chemical cross-linking; the second type of silane chemical cross-linking; the third type of radiation cross-linking.