Treatment method of cross-linked polyethylene power cable affected with moisture
2017-04-25
In urban power grid reconstruction projects, cables, especially polyethylene insulated power cables, have been widely used. However, due to the particularity of the cable, the installation, operation and maintenance of the cable have special requirements. Cable moisture or water to reduce the cable insulation resistance, is caused by the operation of the cable line accident occurred in several important aspects.
Causes and hazards of cable moisture:
(1) When the new whole cable is delivered from the factory, both ends are sealed with plastic sealing sleeves. However, after a period of use according to the actual situation at the construction site, the rest is simply wrapped with plastic cloth to wrap the fracture. As it is usually placed in the open air and is not well sealed, water vapor will inevitably seep into the cable over a long period of time.
(2) When laying cables, it is necessary to frequently cross roads, bridges and culverts. Due to weather or other reasons, a lot of water often accumulates in the cable trench. During the laying process, it is inevitable that the cable head will be immersed in the water, and the water will enter the cable due to lax wrapping or damage of the plastic cloth. In addition, when pulling and threading pipes, sometimes the outer sheath and even the steel armor are scratched, which is particularly prominent when mechanical traction is used.
(3) After the cable laying is completed, the cable head cannot be made in time due to the limitation of on-site construction conditions, so that the cable fracture without sealing treatment is exposed to the air or even immersed in the water for a long time, causing a large amount of water vapor to enter the cable.
(4) In the process of making the cable head (including the terminal head and the intermediate joint), due to the negligence of the construction personnel, the newly processed cable end sometimes accidentally falls into the accumulated water on the site.
(5) in the normal operation of the cable, if the breakdown and other failures occur for some reason, the water in the cable trench will enter the cable along the fault point; in civil construction, especially in the use of large construction machinery construction site, cable damage or breakdown accidents caused by various human factors are also common. When such an accident occurs, the cable insulation is severely damaged, and it will also cause the cable to enter the water.
After the cable enters the water, the aging phenomenon will occur under the action of the electric field, which will eventually lead to the breakdown of the cable.
Handling, cable, occurrence, water ingress, due to, laying, insulation, use, entry, cable head
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