Install “perspective eyes” for underground cables
In many cities in China, especially in some metropolises or new urban areas, power towers and wires are basically invisible, but thousands of households can use electricity normally. Where does people use electricity come from? In fact, this mainly depends on underground cables to transmit electric energy.
Underground cable is an important way of power transmission. The continuous power supply is realized by establishing underground channels and laying cables. In recent years, scientific and technological personnel have become more and more capable of controlling underground cables, and new technologies have been introduced, popularized and applied, which has laid a solid foundation for the all-round development of underground AAC Cables.
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Underground cable is the trend of urban development
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With the acceleration of China’s economic development and urbanization, the contradiction between power facilities and urban development is becoming increasingly prominent. In order to ensure the power safety of urban residents and keep the city clean and beautiful, it is necessary to reduce the starry overhead transmission lines over the city, set them underground and develop underground ACSR Cables.
According to statistics, the proportion of underground power transmission in some modern cities in the world, such as Berlin, Tokyo, Osaka and Copenhagen, has exceeded 70%. At present, China is also accelerating the construction of overhead wire into the ground, underground cable project and underground comprehensive pipe gallery. By 2017, the total length of Beijing underground cable tunnel is about 800 km. It is expected that by the end of the 13th five year plan, the underground cable utilization rate in Beijing’s core area will increase to 94% and the power supply reliability rate will increase to 99.999%.
In 2014, the State Council issued the guidance of the general office of the State Council on strengthening the construction and management of urban underground pipelines. In 2016, the Ministry of housing and urban rural development issued the 13th five year plan for the development and utilization of urban underground space. These documents require deployment to strengthen the construction and management of urban underground pipelines and ensure the safe operation of the city. As a national new area planning, xiong’an new area will adopt the underground pipe gallery mode for the construction of underground pipe network, and deploy water, electricity and urban transportation to the underground space.
In response to the call of the state, State Grid Corporation of China issued document No. 1459 notice on the planning and use management specification of urban power cable channel and the guidance on the planning and construction of power cabin of urban comprehensive pipe gallery in 2014. In the face of the increasing number of underground transmission lines, State Grid Corporation of China further standardized and strengthened the management of underground cables.
With the rapid development of underground cables, the number of underground pipelines will become larger and larger, and the space will become more and more crowded. Construction, operation and maintenance, management and other parties will face great difficulties and pressure. Therefore, there is an urgent need for an effective method to solve this problem. With the rapid development of information technology, three-dimensional digital technology stands out. Using this technology can realize the “perspective” and intelligent management of underground cables.
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What is 3D digital technology?
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The so-called “three-dimensional digitization” is to use three-dimensional tools (software or instruments) to realize a series of digital operations such as virtual creation, modification, improvement and analysis of the model. Generally speaking, it is to use computer technology to virtually appear any scene and object in real life in the computer, so as to realize the undifferentiated mapping from the real world to the computer virtual world.
The traditional three-dimensional digital technology mainly focuses on the modeling of the physical appearance. Based on the modeling software, the solid appearance is simulated in the computer by using the solid construction and rendering technology, which mainly meets the needs of display. At this stage, the three-dimensional digital technology has been upgraded on the original basis. In addition to truly simulating the appearance of the real object, it also includes a series of relevant information such as accurate size, volume, weight, material and management. The three-dimensional digital model constructed in this way belongs to the information model, which can not only meet the visualization requirements, but also carry out a series of calculation, analysis and management.
In August this year, China Electric Power Research Institute Co., Ltd., a scientific research institution directly under the State Grid Corporation of China, used three-dimensional digital technology to build a digital design system for power cable engineering. The system supports the construction of underground cable information model with voltage level of 35 kV to 500 kV, including different types of underground cable lines such as pipe arrangement, tunnel, comprehensive pipe gallery (power cabin), cable trench, bridge and direct burial. It not only realizes the three-dimensional digitization of the underground cable engineering body, but also supports the above ground buildings in the power corridor 3D visualization of the surrounding environment of other types of underground pipelines. Based on the completed three-dimensional digital model, the safe distance between the underground cable engineering body and the surrounding environment can be calculated, and a series of work such as cable engineering body planning, design, construction and management can be carried out. In addition, in order to save the construction time of underground cable informatization model and improve the model accuracy, the system has built three-dimensional general model libraries such as pipe arrangement, tunnel, cable trench, bridge and working well according to the general design library of State Grid, and provided parametric modeling tools such as pipe arrangement, tunnel, comprehensive pipe gallery (power cabin), AAAC Cable trench, bridge and direct burial, Have the ability to automatically build a 3D model by inputting parameters.