11-25
The cable is water, what can I do?
November 25, 2017
Entering the rainy season each year, especially this year's falling rainwater, this year is particularly much. The common problems that the cables are forgotten after forgetting the head are water. After the cable is in water, under the influence of the electric field, the water tree will cause the cable to penetrate. The water tree is a gap between 0.1m to a few microns. The local high -electric field parts formed by the impurities, pores and insulation and inside and outside semi -conductive electrical layers in the insulation are the starting point of the water tree. The development of water trees is generally more than 8 years. The higher the humidity, temperature, and voltage, the more ions in the water, the faster the water tree develops.CauseDuring custody: The newly purchased tube cables are sealed with plastic sealing sleeves at both ends, but after a while, the remaining plastic paper is wrapped in plastic paper, and the rope is tied outside. Infart in the cable.During the laying of the cable: When the cable is laid, the cable head wrapped in plastic paper is sometimes immersed in water to make the water enter the cable; when traction and pipe pipes, the outer sleeve rupture is sometimes occurred.After laying: The cable head is made in time, so that the unsightly cable ports are exposed to the air for a long time, immersed in water, and water vapor enters the cable in large quantities.During the production of the cable head: when the cable head is produced (including the terminal and the intermediate connector), due to the intention of the producer, the cable end is sometimes slid into a stagnant cable well.During the running of the cable: During the running of the cable, when the intermediate seals breakdown and other failures occur, the water in the cable well will enter the cable along the gap; at the construction site, the external force causes the cable to be damaged or penetrated, and the cable water will also occur.Approach It is very difficult to dry after the cable is dried (such as hot nitrogen and drying), and generally does not configure the corresponding equipment. In actual operation, if the cable is in water, it is just a few meters of the front end. Therefore, the prevention of cable water in water should be mainly based on prevention and the following measures:The cable head should be sealed. The sawing cable end, whether it is stacked or laid, is sealed with plastic (using a cable -dedicated sealing cover) to prevent the moisture from penetrating.After the wire is laid, the cable head should be made in time.
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