1. YTTW cable structure
①Copper conductor ②High temperature resistant (1375℃) non-flammable inorganic (mineral) insulation tape insulation ③Outer copper sleeve
2. YTTW cable performance characteristics
1. Advantages: It is a metal sheathed inorganic mineral insulated cable. It is a flexible fire-resistant cable, 1, fire-resistant
The two materials used in mineral insulated cables, copper and magnesium oxide, are inorganic substances. This kind of cable will not burn or support combustion, and it can continue to operate under conditions close to the flame. The copper sheath melts at 1083°C, while the magnesium oxide insulation material solidifies at 2800°C.
2. High operating temperature
Mineral insulated cables can withstand continuous operating temperatures up to 250°C. However, in an emergency, the cable can continue to operate in a short period of time at a temperature close to the melting point of the copper sheath.
3. Long life
Inorganic materials used in mineral insulated cables can ensure that the cables have stability, long life and fire resistance.
Disadvantages: YTTW cable, first of all, its sheath adopts copper sheath, and the amount of copper used increases greatly, so the production cost increases. Cables with larger cross-sections are still relatively hard and not flexible enough, so larger cross-sections (greater than 630mm2) cannot be produced yet, which cannot meet the requirements of large current systems.
The cable copper tube is continuously welded vertically, which is easy to fall off. The cable burst accident occurred due to the bending radius during the use of the China Pavilion at the Shanghai World Expo. At present, it has been hit hard by the issue of the China Pavilion, and the risk is high. It remains to be seen.