What is the effect of water on the performance of cross-linked power cable products?

Cross-linked power cables into the water is mainly divided into the conductor into the water and the sheath into the water (including the inner protection), water or moisture for the cable used in polymer materials, can make it produce hydrolysis, reduce the strength and softness of the material, the water is polymer adsorption, absorption and diffusion, which can make the electrical properties of the serious deterioration, so that the surface resistance, volume resistance and the breakdown field strength decreased, so that the capacitance and dielectric loss angle tangent increase; cable into the water, under the action of electric field, the product will be water tree aging phenomenon. After the cable into the water, under the action of the electric field, the product will occur water tree aging phenomenon, the higher the humidity, the higher the temperature, the higher the voltage, the more ions contained in the water, the faster the development of the water tree; all of the above will lead to a shortening of the life of the product, or in severe cases, the product in a short period of time to breakdown.
Cross-linked power cables in the production process into the water is mainly concentrated in two processes: crosslinking process and sheath process. In the crosslinking process in the production process, due to the cable water-blocking joints are not dealt with, and other reasons will lead to crosslinking insulated wire core water, water or moisture once inside the insulated core, it is difficult to deal with, can only be into the water crosslinking core cut, resulting in a waste of materials, cost increases, and even delayed shipment of cables; in the sheathing process, due to the operator's poor sense of responsibility or operational errors, resulting in the cable Head in the traction when falling into the water tank or cable in the production process did not control the cable inside and outside the sheath thickness and eccentricity, resulting in holes in the sheath after the water into the cable, such as the head of water can only be the head of the cable into the water cut off, affecting the number of meters of cable shipments; such as the cable in the middle of the water due to the holes in the sheath, it is difficult to deal with the drying, that is, the use of the drying machine blowing, it is difficult to blow dry, once the cable shipments, in the long-term operation process, the cable water becomes an impact on the cable, and even delayed cable delivery. Once the cable is shipped, in the long-term operation process, water in the cable becomes a potential hidden danger affecting the safe operation of the cable, which may eventually lead to cable breakdown or return, the consequences are very serious. In addition, in the middle of the packaging and storage and transportation process will also occur in the cable water phenomenon, once the cable head is not sealed or cable due to storage and transportation of the sheath is damaged, will also cause the cable end of the water, the customer is difficult to accept.

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