What are the treatments for low voltage power cables against moisture?

I. What are the treatments for low voltage power cables against moisture? If the low voltage power cable sheath thin place can not meet the requirements, the cable sheath will be damaged before reaching the normal large external destructive force. Due to the low-voltage power cable used as an insulator of magnesium oxide crystalline powder is a high rate of moisture absorption materials, in the cable transportation and laying process, once the outer sheath is slightly damaged, magnesium oxide crystalline powder will be affected by moisture, the resistance is greatly reduced; In addition, in the production of the cable in the middle of the end of the joints should be cut off from the cable, which will also result in the magnesium oxide crystalline powder damping.1, cable damping end of the dehumidification method in the low-voltage Power cable end, moisture intrusion range is generally 300-400mm, but if the cable end is not temporarily sealed, long exposure to the air, moisture can invade about 1m. At this time, the moisture end of the cable can be tilted upward, with a gasoline burner from the cable end of about 1 m away from the cable gently baked cable, so that the moisture in the cable magnesium oxide gradually discharged from the inside out. If one end of the baking measured insulation resistance rise is very small, the same way to continue to bake the other end of the cable, until the insulation resistance is qualified. 2, low-voltage power cable copper sheath damage to find and repair when the cable in the middle of the copper sheath in the construction process fracture, and its repair method is: low-voltage power cable insulation at both ends of the insulation layer of the insulation resistance value of the level of the fire after dehumidification does not rise or not much change, can be judged to be Middle fault. The full length of the cable can be baked with a civilian fire, the high resistance of the multimeter can be used to find. If the pointer reading changes greatly when baking a certain part, the fault point can be determined here, and then cut off the power system, dehumidification by slow fire baking, dehumidification, check whether the insulation value is qualified, and connect the cables with intermediate connectors. Moist cable insulation 200 ℃ baking resistance change curve, at the same time, in the selection and use of low-voltage power cables should pay attention to some relevant issues.

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