氧化镁电缆的简介 Introduction of Magnesium Oxide Cable

http://www.ykbhlm.com铜芯铜护套氧化镁绝缘防火电缆(以下简称氧化镁电缆)，是一种外层采用无缝铜管护套、中间充填轻烧镁粉作绝缘材料、以单股铜棒作为导体的新型电缆。它不但能耐高温、防火、防爆、阻燃，而且载流量大、外径小、机械强度高、使用寿命长、一般不需要独立接地导线。因此，氧化镁电缆被广泛应用于危险、恶劣、高温的环境中，如核电站、冶金、化工、矿井、制窑等。近年来，随着各种技术工艺的蓬勃发展，氧化镁电缆也较多的应用于高层楼房、机场、码头、地铁等民用建筑，用以保障在火灾情况下消防水泵、消防电梯、局部照明、应急疏散指示、保安监视、防烟排烟系统、自备电源等消防用电及重要设备的不间断运行。

氧化镁电缆的构造与型号规格：

氧化镁防火电缆制造工艺比较复杂。主要有两种方法，一是先在外层的无缝铜管与核心的铜芯导体之间灌入轻烧镁粉，然后进行压实；二是先将轻烧镁粉压制成空心的圆柱，将它穿入导体和铜管之间，然后通过拉拔——退火——再拉拔等多道工序循环反复进而制成电缆。需要注意的是，在氧化镁电缆的加工过程中需要不断检测氧化镁的密实性和铜管的气密性等项目。通过对氧化镁电缆制作过程和方法的了解，我们可以看出电缆的结构主要由三部分组成：外层的无缝铜管护套、中间起绝缘作用的轻烧镁粉、核心作为导体的铜棒。

氧化镁电缆的型号可以分为BTTQ轻型电缆（500V级）和BTTZ重型电缆（750V级）两种，凯宾斯基项目主要为BTTZ重型电缆。其规格主要有单芯、二芯、三芯、四芯、七芯、十二芯等。单芯至四芯的氧化镁电缆主要用于动力、照明，七芯以上的主要用于通讯、控制。单芯电缆线最大截面可达4002ｍ㎡，二芯至四芯电缆芯线最大截面为25ｍ㎡。

http://www.ykbhlm.com Copper core copper sheathed magnesium oxide insulated fire-resistant cable (hereinafter referred to as magnesium oxide cable) is a seamless copper tube sheath on the outer layer and light-burned magnesium powder filled as insulation material in the middle New type of cable with single-stranded copper rod as conductor. It not only can withstand high temperature, fire, explosion, flame retardant, but also has large current carrying capacity, small outer diameter, high mechanical strength, long service life, and generally does not require independent grounding wires. Therefore, magnesium oxide cables are widely used in dangerous, harsh and high-temperature environments, such as nuclear power plants, metallurgy, chemicals, mines, and kiln manufacturing. In recent years, with the vigorous development of various technologies, magnesium oxide cables have also been used in high-rise buildings, airports, terminals, subways and other civil buildings to protect fire pumps, fire elevators, local lighting, Uninterrupted operation of emergency evacuation instructions, security surveillance, smoke prevention and exhaust systems, self-provided power supplies and other important fire equipment.

Structure and model specifications of magnesium oxide cable:

The manufacturing process of magnesium oxide fireproof cable is relatively complicated. There are two main methods. First, lightly burned magnesium powder is poured between the seamless copper tube on the outer layer and the core copper conductor, and then compacted. Second, the lightly burned magnesium powder is pressed into a hollow cylinder. It is inserted between the conductor and the copper pipe, and then it is repeated through drawing, annealing, and drawing to make a cable. It should be noted that during the processing of magnesium oxide cables, it is necessary to continuously check the compactness of magnesium oxide and the air tightness of copper pipes. By understanding the manufacturing process and method of magnesium oxide cable, we can see that the structure of the cable is mainly composed of three parts: the seamless copper tube sheath of the outer layer, light-burned magnesium powder that plays an insulating role in the middle, and copper with the core as the conductor. Baton.

The types of magnesium oxide cables can be divided into BTTQ light cables (500V class) and BTTZ heavy cables (750V class). The Kempinski project is mainly BTTZ heavy cables. Its specifications are mainly single-core, two-core, three-core, four-core, seven-core, twelve-core and so on. Single-core to four-core magnesium oxide cables are mainly used for power and lighting, and more than seven cores are mainly used for communication and control. The maximum cross-section of single-core cable can reach 4002m㎡, and the maximum cross-section of two-core to four-core cable core is 25m㎡.