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What requirements should be met when multiple cables are laid in the same trench?

by:AAA     2020-03-15
With the improvement of citizens' requirements for the quality of life and living environment, the 'spider web' formed by the two sides of the road or crossing the road and the dense and interwoven weak current lines ', it is no longer the modern 'symbol' of the city, but it hinders the city's image and is associated with many potential safety hazards. The public is eager for the government to sort out the exposed wires and cables and lay them in the ground, which can not only protect the cables, but also reduce the occurrence of accidents. Why not? The harm brought by the open-air electric wire makes the cable into the ground get much attention, which has been recognized and supported by most countries, especially the countries with faster urbanization process are more fond of cable into the ground, which can not only beautify the urban landscape, improving the city's popularity can also reduce the probability of external damage to wires and reduce accidental losses, which can be described as killing two birds with one stone. Let's talk about what requirements should be met when multiple cables are laid in the same trench or cross each other? 1. The minimum net distance between power cables or between power cables and control cables is 10kV and below 0. 1 m, above 10kV is 0. 25 m; Cables used in different parts (Including communication cable)Each other is 0. 5 m, if separated by cable partitions, it can be reduced to 0. 1 m, no provision is made in the tube. 2. The minimum net distance when cables cross each other is 0. 5m The cable is within the range of 1m before and after the intersection. If the cable is separated by a partition, the above interval can be reduced to 0. 25 m, no provision is made when entering the pipe. 3. The following reasons should be considered when cables are parallel or cross to maintain a certain interval: when checking cables, if the adjacent cables are too close to each other, mechanical trauma will easily occur. In order to prevent the adjacent cables from burning out due to the failure of the cables during operation, the cables should be kept at appropriate intervals; The distance between cables is too close to dissipate heat easily, thus affecting the current carrying capacity of cables; If the cables are close to each other or cross and can not keep a certain interval and contact with each other, it is easy to produce 'AC erosion '. Once the cable laid in the cable trench fails, it will not only have a direct impact on the city's electricity consumption, but also may cause the failure of relay protection or control circuit, causing accidents to expand or even damage the main equipment, production cannot be resumed for a long time. Therefore, the cable believes that the management of cable trench construction must be strengthened to protect the cables in the cable trench from damage, which is of great significance to the safe operation of power plants and substations, and to ensure the safety and reliability of urban electricity, it provides a solid foundation for the rapid development of urban economy.
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