In the maintenance of cables, preventing the occurrence of insulation degradation is a very important issue, because the insulation degradation will bring many faults, such as breakdown, such as shortening the service life of the cable, which will bring inconvenience to human production and life, so In the maintenance work of the cable, it is necessary to understand the reasons leading to the reduction of insulation and the maintenance method.
Here are a few common reasons that lead to the reduction of cable insulation. The most common one is external force damage. There are design problems in the place where the cable is laid, which leads to 1.5~500 mm² 1-5 Core LV Power Cable bumps, which will lead to cable damage and reduce insulation. The most common is During road repairs, cables buried in the ground were dug and broken, which is a common accident in many urban constructions. Judging from the operation analysis in recent years, especially in today's rapid economic development, a considerable number of cable failures are now caused by mechanical damage.
Another reason is that the insulation is damp, which is also a very common reason. It usually occurs in cables buried directly or in pipes. Because the laying operation was not rigorous at the beginning or the cable joints were not handled properly, resulting in the later cable Into the water vapor, water branches will form under the action of the electric field for a long time, which will gradually damage the insulation strength of Aerial Bundled Cable (ABC) ASTM B231 Standard and cause failure.
In addition, chemical laying is also a major cause of insulation degradation. Cables are buried in areas affected by acid and alkali. In the long term, the insulation will definitely be corroded, which will eventually lead to the failure of the protective layer and the insulation degradation; long-term load transportation will also affect the insulation and cause the cable Severe heating for a long time will accelerate the aging of the insulation, cable connector failure, environment and temperature, and many other factors will affect the insulation service life of the cable.
Therefore, the cables need to be considered and selected in many aspects before they are laid to the operation work and later maintenance work. This is a work that requires both experience and technology.