The hottest copper cable adds bricks and tiles to

2022-08-15
  • Detail

Copper cables "add bricks and tiles" to the power supply of the subway

with the rapid development of China's economy and urbanization process, the population of large and medium-sized cities has increased sharply, and the demand for urban travel has increased greatly. Subway construction has become a city of great concern to bring reliable operation guarantee projects to business friends. In urban life, the subway is playing a more and more important role in Nanjing Julong. It is expected that in the future, glass fiber has proved to be the preferred alternative material, becoming the main way of travel for more and more people, and ensuring the operation of the subway has become a major livelihood project

among the many guarantees of subway operation, power supply is the top priority. As we all know, subway is an electric train with electric traction, and its power source is electric energy. In addition to trains, there are a series of supporting facilities for subway operation, including lighting, ventilation, air conditioning, drainage, communication, signaling, disaster prevention and alarm, escalators, etc., which also need electric energy. In the subway system, the importance of electric energy is self-evident. Safe and reliable power supply is an important prerequisite for the normal operation of the subway

the subway power supply system is not only huge and complex, but also has many characteristics of power supply. Therefore, the standards and requirements for subway cables are beyond ordinary cables, and copper cables are favored by subway builders because of their excellent and comprehensive performance

subway operation has a great demand for electric energy, so traction substations and step-down substations are set along the line. As a metal with conductivity second only to silver in nature, copper has a conductivity of about 1.6 times that of aluminum and a larger current carrying capacity, which can better load the huge power consumption of the subway to meet the power demand of all electrical equipment, including trains and supporting facilities. In addition, in the process of subway operation, it needs to start and stop repeatedly to stop at the station. This kind of impact power load has a certain test on the cable. In addition to the above characteristics, copper cables also have stronger adaptability to frequently changing currents and can better withstand such impact loads

in the subway power supply system, the cable length is generally large, and there is inevitably the situation of voltage drop and heat consumption of electric energy. Cable heating is easy to cause loose joints, which is also a major hidden danger of fire. In the same case, the selection of copper cables can reduce line heating and improve power efficiency, while lower circuit resistance can also help reduce line voltage drop, improve the power quality of subway power supply system and reduce the risk of equipment damage

it is worth mentioning that the laying and maintenance of Metro cables are in tunnels, with narrow space and complex environment, which puts forward higher requirements for the performance of cable materials. Compared with the situation that aluminum cable is easy to break when bending, copper cable has better flexibility and fatigue resistance, and it is more suitable in the complex and diverse environment of subway. Moreover, the copper cable has good stability, and it is not easy to corrode even in high temperature or underground humid environment. Long term use will not affect the performance, and it is not easy to produce potential safety hazards

as the saying goes, "safety is more important than Mount Tai", so is the subway project. As the most widely used cable in the world, copper cable plays an irreplaceable role in the subway power supply system. The subway operation can not tolerate any failure. At least, it will cause the speed limit and stop of the subway (called the down stretch test run), which will bring inconvenience to the public travel, and even endanger the lives and property safety of passengers in serious cases. It is believed that in the construction of multiple subways in the future, copper cables will have more "places to play" to provide protection for the power safety of Chinese subways

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