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Talking about the difference between irradiation and silane crosslinked cable

by:AAA     2020-04-02
Customer orders sometimes encounter model WDZ-YJ (F) E Cable, the name of this type of cable should be interpreted as copper core irradiated XLPE insulated low smoke halogen-free flame retardant polyolefin sheathed power cable, power cable product standard GB/T 12706. 1 ~ 3-2008 'rated voltage 1kV (Um = 1. 2kV)To 35kV (Um = 40. 5kV) Extruded insulated power cables and accessories, Part I Appendix D 'supplementary terms of cable products', regarding the expression method of insulation code, the code for XLPE insulation is YJ, there is no distinction between what type of crosslinking (Physics or chemistry) Radiation Crosslinking belongs to physical crosslinking type, and adding 'F' to the model is a commonly used radiation crosslinking insulation representation method in the industry. The implementation standard should still be GB/T 12706-2008. Customers choose this model, intended to use irradiation cross-linked insulation core to meet the requirements of its special use occasions. So what are the advantages of irradiation crosslinking and ordinary silane insulation? Irradiation crosslinking is the crosslinking of the cable by using the high-energy electron beam current generated by the electron accelerator, which makes the polyethylene insulation layer of the cable change from a linear molecular structure to a three-dimensional network structure, forming a three-dimensional lattice smaller than water molecules, A dense layer is formed on the surface and inside of polyethylene, thus effectively preventing the combination of hydroxide and water molecules. This crosslinking method not only improves the temperature resistance, wear resistance and flame retardant properties of wires and cables, more importantly, it plays a role in blocking water. This crosslinking method has no high temperature and no water, can not only make polyethylene crosslinking, but also improve the flame retardant and electrical properties of the cable. The cable has the characteristics of low smoke, halogen-free, flame retardant and high temperature resistance. The specific performance is as follows: high temperature resistance grade; The long-term allowable working temperature of the conductor can reach 135 ℃ ( The materials for filling, wrapping and sheathing need to be selected with the same temperature resistance grade as the insulation, while the temperature resistance of ordinary silane crosslinked polyethylene insulated cable is 90 degrees); Good halogen-free flame retardant performance: Smokeless gas, light transmittance ≥90%, Ph ≥6. 0 ( The light transmittance of ordinary low smoke halogen-free cables is ≥60%, and the pH value is ≥4. 3); Excellent mechanical properties. Wear-resistant times up to 160,000 times, the service life of more than 50 years. However, due to the large investment in irradiation equipment, the general cable production enterprises do not have the irradiation capacity. If the irradiation is processed outside, the transportation cost, irradiation cost, etc. increase the cable cost and the production cycle is extended, which affects the product delivery. Therefore, some cable material manufacturers have developed 'silane cross-linked halogen-free low smoke flame retardant polyolefin insulation' according to the characteristics of irradiated cross-linked cables as their substitutes. Its characteristic is that it can be boiled and crosslinked with traditional warm water, and has the characteristics of halogen-free, wear resistance and the like, and the temperature resistance grade is also improved. However, because it is boiled in warm water, hydroxide absorbs water and leads to a decrease in insulation resistance, so the electrical performance cannot reach the level of irradiated crosslinked cable. When processing customer orders, if the required model is WDZ-YJ (F) E, it can be understood that there is no special requirement for the temperature resistance grade of the cable, which is still 90 degrees, but it has high requirements for its wear resistance and service life. Density of silane crosslinked halogen-free low smoke flame retardant polyolefin insulation 1. 45 g/cm Lu, the density of irradiated crosslinked insulating material is equivalent to it, which is greater than the density of water. If ordinary silane Crosslinked Insulation is used instead of irradiated crosslinked insulating material, as long as a small piece is put in the water to see the ups and downs, it can be identified. Therefore, it is not feasible to replace the irradiated crosslinking material with ordinary silane insulating material, and the difference in performance between the two is too great. However, whether it can be replaced by silane crosslinked halogen-free low-smoke flame retardant polyolefin insulation should be fully communicated with the customer first to understand the customer's use situation and then decide whether it can be used instead.
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