The cable burns for several hours in a fire field with a high temperature of 1000℃, and the power transmission is still unaffected!
"This is the mineral insulated non-flammable cable developed by YZBS Cable Technology Corporation. It is composed of copper core, mineral insulating material, copper and other metal sheaths. In addition to good electrical conductivity, mechanical and physical properties, it also has good fire resistance. It is also known as “incombustible cable” and fire-resistant cable.” According to Dr. Yang, CTO of YZBS, this type of cable can not only ensure fire-fighting power supply for the duration of the fire, but also It burns and does not produce smoke, which buys time for fire escape and rescue in densely populated places such as high-rise buildings.
It is understood that as early as 1998, YZBS began to develop mineral insulated cable technology, and spent huge sums of money to introduce imported equipment and processes to optimize and upgrade.
In 2011, YZBS successfully overcome the two major key technical problems restricting the development of mineral insulated cables, "short length" and "multiple connectors", and realized the unlimited length of mineral insulated cables, which can provide customers with customized services of any length just like ordinary cables. In recent years, YZBS has continued to innovate in technology and has developed a variety of mineral insulated non-combustible cables, realizing the serialization of mineral insulated cable products, allowing customers to have more and more personalized choices according to the application. This series of technological breakthroughs successfully avoided failures caused by too many joints and overcome a number of industry-specific problems.
Mineral insulated cable is currently a wire and cable product with excellent flame-retardant and fire-resistant properties. Therefore, in recent years, key projects such as Beijing Daxing International Airport, Beijing Winter Olympics, Hangzhou Metro, Beijing Kexing Vaccine Workshop, and Hangzhou Olympic Sports Center have all selected YZBS mineral insulated non-combustible cables.
Although mineral insulated non-combustible cables have excellent fire resistance, their cost is relatively high. For this reason, YZBS has developed B1 flame-retardant cables according to the characteristics of subways and other places. Compared with general flame-retardant cables, when a B1 cable occurs in a fire, as the temperature of the cable rises, not only the external flame-retardant layer will not burn, but also it will isolate the external oxygen from contacting the inside of the cable, greatly reducing the surface of the cable. The temperature greatly increases the flame retardant and fire resistance.
The product needs to pass multiple B1 level combustion performance testing items, and upgrade and transform materials, processes and equipment in many fields. Compared with the original bundled combustion flame retardant system, the ventilation flow of the B1 flame retardant cable during the combustion test has increased by 60%, resulting in a more obvious chimney effect. The arrangement of all the sample gaps also makes the cable sample in the open flame It is easier to ignite under the condition, but the carbonization height of the final assessment has dropped from 2.5m to 1.5m, and the total heating value of combustion is not more than 15MJ (megajoules, calorific value unit), which is equivalent to the total heating value of 300g cross-linked polyethylene insulation. . This series of products effectively solves the "secondary pollution" of combustion, which is of great help to the protection of air and personal safety.
After China's mandatory national standard "Civil Building Electrical Design Standard" is implemented, industry experts predict that by 2023, the market demand for Class B1 flame-retardant cables will exceed 10 billion yuan. On the way of iterative innovation, the YZBS R&D team also faced many difficulties. "Considering the electrical performance, mechanical strength and other performance requirements of the sheath and insulation materials, the content of flame retardant in the cable cannot be increased indefinitely. If the fire performance of the cable needs to be further improved, it is necessary to rely on structural fire protection technology." Because the B1 flame-retardant cable adopts a special flame-retardant material formula and structure design, it can be "cooled" and "isolated" during the test.
To this end, YZBS introduced the second-class National Technical Invention Award of Sichuan University and the Chinese Patent Gold Award "New Triazine Flame Retardant" on the basis of the core technologies of self-developed halogen-free material nano-interface modification, hybrid flame retardant, and heat release regulation. Key technologies for clean preparation and processing of flame-retardant plastics". This successful practice has achieved high filling of flame retardants, improved material processing fluidity, prepared low-release environmentally friendly flame-retardant cable materials, successfully introduced the concept of high safety and low heat release into the wire and cable industry, and developed high-safety, High flame-retardant materials and cables with low combustion heat release, low smoke emission, low smoke and halogen-free have reached the domestic leading and international advanced level.
Up to now, YZBS B1 series products have successfully applied for 6 invention patents and 14 utility model patents. They have completed Class B1 flame-retardant medium voltage power cables, B1 class flame-retardant cables for 35kV ring network trunk lines, and cross-linked polyethylene insulation B1. The research and development work of 20 new products such as flame-retardant 1500V DC traction cable has realized the full coverage of the B1 flame-retardant wire and cable product series in the traction, transmission and distribution, and control systems of subways, engineering buildings and other fields.
YZBS has gained market recognition and unanimous praise from customers. The company's B1 series cable products have been used in dozens of subway construction projects such as Chengdu Metro and Hangzhou Metro.