①金属屏蔽层包裹在绝缘屏蔽层外，金属屏蔽层一般采用铜带或铜丝，它是将电场限制在电缆内部，保护人身安全的关键结构。也是保护电缆免受外界电气干扰的接地屏蔽层。JF JXF JEF电机引接线 规格 型号 价格 生产厂
(1) the metal shielding layer is wrapped outside the insulation shielding layer. The metal shielding layer usually adopts copper tape or copper wire. It is the key structure to restrict the electric field to the cable and protect the personal safety. It is also the grounding shield to protect the cable from external electrical interference.
②在系统发生接地或短路故障时，金属屏蔽层是短路接地电流的通道，其截面积应根据系统短路容量、中性点接地方式计算确定，一般10kV系统计算屏蔽层截面积推荐不小于25平方毫米。JF JXF JEF电机引接线 规格 型号 价格 生产厂
(2) when the system is grounded or short circuited, the metal shield is the channel of short circuit grounding current. The sectional area should be determined according to the system short circuit capacity and neutral point grounding mode. The re...mended area of the shielding layer in general 10kV system is not less than 25 mm2.
③在110kV及以上电缆线路中金属屏蔽层是由金属护套构成，既有电场屏蔽作用还有防水密封功能，同时还兼有机械保护功能。
(3) in the 110kV and above cable lines, the metal shield is made up of metal sheath, which has the electric field shielding function and the waterproof sealing function, and also has the mechanical protection function.
④金属护套的材料和结构一般采用波纹铝护套；波纹铜护套；波纹不锈钢护套；铅护套等。另外有一种复合护套，是采用铝箔贴在PVC、PE护套内的结构，在欧美的产品中使用较多。JF JXF JEF电机引接线 规格 型号 价格 生产厂
(4) the material and structure of metal sheath generally use corrugated aluminum sheath, corrugated copper sheath, corrugated stainless steel sheath, lead sheath and so on. In addition, there is a ...posite sheath, which is used in the PVC and PE sheath structure of aluminum foil, and is used more widely in Europe and America products.
铠装层
Armour layer
①在内衬层外缠绕有金属铠装层，一般采用双层镀锌钢带铠装。其作用是保护电缆内部，防止在施工、运行过程中机械外力对电缆的损伤。也兼有接地防护的作用。
(1) there are metal armour layers outside the inner lining, and the double layer galvanized steel strip is usually armored. Its function is to protect the cable internal, to prevent mechanical damage to the cable in the process of construction and operation. It also has the function of grounding protection.
②铠装层有多种结构，如钢丝铠装，不锈钢铠装，非金属铠装等，用于特殊电缆结构。
There are many kinds of structures, such as steel wire armour, stainless steel armor, non-metal armor, etc., for special cable structure.
外护套
Outer sheath
①这是电缆最外边的保护，一般采用聚氯乙烯（PVC）聚乙烯(PE)，都是绝缘材料，采用挤包成形。按照技术要求，一般采用的是阻燃聚氯乙烯（PVC）。适应冬季寒冷和夏季炎热的要求，不开裂，不软化。
This is the outermost cable protection, generally using polyvinyl chloride (PVC) polyethylene (PE), are insulated materials, the use of extrusion forming. According to technical requirements, flame retardant polyvinyl chloride (PVC) is generally used. Adapt to the cold winter and hot summer demand, not cracking, not softening.
②外护套主要的作用是密封防止水分侵入，保护铠装层不受腐蚀，防止电缆故障引发的火灾扩大。
The main function of the outer sheath is to prevent water intrusion, protect the armor layer from corrosion and prevent the expansion of the fire caused by the cable failure.
