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Discussion on difference between irradiation and silane cross-linked cable
Mar 26, 2018

  A cable of type WDZ-YJ (F) e is sometimes encountered in a customer order, the name of which should be interpreted as copper core irradiated xlpe insulated low smoke halogen-free flame retardant polyolefin sheathed 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 provisions of cable products", on the expression of insulation code, for Xlpe insulation code-named YJ, and does not distinguish between the types of cross-linking (physical or chemical), Irradiation cross-linking is a physical crosslinking type, and in the model, "f" is used in the industry, which is one of the usual methods of irradiation crosslinking insulation. The implementation standard should still be GB/t 12706-2008. The customer chooses this type, is intended to use the irradiation crosslinking insulation core to satisfy its special use occasion the request.


So what are the advantages of radiation crosslinking and ordinary silane insulation? Irradiation cross-linking is the cross-linking of cables by high-energy electron beam currents produced by electron accelerators, the insulation of the cable from the linear structure of polyethylene into three-dimensional network structure, forming a smaller than the water molecule of the three-dimensional lattice, in the polyethylene surface and the formation of dense layer, thereby effectively preventing the combination of hydroxide and water molecules, This kind of crosslinking method not only improves the temperature resistance, wear resistance and flame-retardant performance of wire and cable, but also plays a role of water resistance. This crosslinking method has no high temperature, no water, can make polyethylene crosslinking, and can improve the flame retardant and electrical properties of cable. The cable has low smoke, halogen-free, flame-retardant and high temperature characteristics. Specific properties are as follows: High temperature resistance, conductor long-term allowable operating temperature up to 135 ℃ (fill, around the bag, sheathing materials need to choose a temperature-resistant grade and insulation consistent material, while the general silane XLPE Insulated cable temperature is 90 degrees; halogen-free flame retardant performance: No smoke gas, light transmittance ≥90%, ph value of ≥6.0 (ordinary low smoke halogen free cable transmittance ≥60%,ph value ≥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 manufacturers do not have irradiation capacity, irradiation, transport costs, irradiation costs and other increases in cable costs and production cycle extension, affecting product delivery. So some cable material manufacturers according to the characteristics of irradiated xlpe cable developed ' silane crosslinking halogen-free flame retardant polyolefin insulating material ', as its substitute. Its characteristic is can use the traditional warm water cooking cross-linking, and has halogen-free, wear-resistant characteristics, temperature-resistant grade also improved.


However, because it is warm water cooking, hydroxide absorption of water leads to the loss of insulation resistance, so electrical properties can not reach the level of irradiated cross-linked cable. When processing customer orders, if the required model is WDZ-YJ (F) e, it can be understood that the temperature of the cable has no special requirements, is still 90 degrees, but to its wear-resistant, the life of the high requirements. Density of silane crosslinked halogen-free flame retardant polyolefin insulating material 1.45 g/cm Lu, the density of the irradiated crosslinked insulating material is equal to the density of the water, if the common silane cross-linked insulation instead of the irradiated crosslinked insulating material, only take a small piece of water to see the ups and downs can be identified, Therefore, it is not feasible to replace irradiated crosslinking material with ordinary silane insulating material, and the difference in performance is too great. But whether can use silane crosslinking halogen-free flame retardant polyolefin insulating material to replace, should be fully with the customer communication, understand the customer's use situation and then decide whether can substitute.


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