Flame-retardant cables will make a great contribution to my country's transportation construction
With the rapid development of China's economy and the rapid progress of urbanization, the population of large and medium cities is increasing rapidly, and the demand for urban travel has also increased. Subway construction has become a municipal project that has attracted much attention and attention. In urban life, the subway is playing an increasingly important and irreplaceable role. It has become the main mode of travel for more and more people. Ensuring the healthy and safe operation of the subway has become another major livelihood project.
Among the many guarantees for subway operation, power supply can be said to be the top priority. As we all know, the subway is an electric train driven by electricity, and the source of its power is also electric energy. In addition to trains, the subway must have a series of supporting facilities in order to operate, including lighting, ventilation, air conditioning, drainage, communication, signals, disaster prevention alarms, and escalators, etc., and all require electricity. In the subway system, the importance of electrical energy can be said to be self-evident, and safe and reliable power supply is also a very important prerequisite for the normal operation of the subway.
The power supply system of the subway is not only very large but also very complicated. There are many characteristics of power supply. Therefore, the standards and requirements of subway cables are beyond those of ordinary cables. The flame-retardant cables have been praised by many subway builders due to their excellent and comprehensive performance. Favor. It is well known that subway operation has a large demand for electric energy, so traction substations and step-down substations are set up along the line. Copper is a metal whose conductivity is second only to silver in nature. Its conductivity is about 1.6 times that of aluminum, and its current carrying capacity is also greater. It can better load the huge electric power brought by subway operation to meet All electricity demand for all electrical equipment including the train and its complete set of supporting facilities. In addition, during the operation of the subway, stops and stops need to be repeatedly started and stopped. This kind of shocking power load definitely puts a certain test on the cable performance. In addition to the above-mentioned characteristics, copper cables are also more adaptable to frequently changing currents, and can withstand the load brought by this impact.
In the power supply system of the subway, the length of the cable is generally relatively large, which inevitably exists in the voltage drop and heat consumption of electricity. The heating of the cable can easily cause the joint to loosen, which is also one of the important hidden dangers of fire. In the same situation, the use of flame-retardant cables can greatly reduce line heating and improve the efficiency of power consumption, and lower circuit resistance can also help reduce line voltage drops, thereby improving the power quality of the subway power supply system, which will also be obvious Reduce the risk of equipment damage.
It is particularly worth mentioning here that the laying and maintenance of subway cables are all carried out in tunnels. The space is relatively small and the environment is more complicated. This puts more stringent requirements on the performance of cable materials. Compared with the situation where aluminum cables are easily broken when bent, flame-retardant cables must have better flexibility and fatigue resistance, and they must be more applicable in the complex and diverse environments of subways. In addition, the stability of copper cables is good, even in high temperature or underground humid environment, it is not easy to be corroded, long-term use will not affect performance, and it is not easy to cause safety hazards.
As the so-called "safety issues are heavier than Mount Tai," the same is true for subway projects. Copper cables themselves, as widely used cables worldwide, can be said to play an irreplaceable role in the subway power supply system. The health operation of the subway must not tolerate the slightest failure, which will cause the speed limit or suspension of the subway, which will bring inconvenience to the people's travel, and even endanger the life and property safety of passengers in serious cases. Then there will be many subways to be constructed in China next, and flame-retardant cables will also have more "applications" to provide safety guarantee for China's subway electricity.
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