Protection of the power cable. The lead skin is damaged at the time of laying or the electrical insulation of the cable insulation during operation causes the insulation between the cable and the lead, and the resulting arc causes the insulating material and the outer protective layer of the cable to ignite.
Long time overload operation, the cable insulation material operating temperature exceeds the normal maximum heat allowable temperature, so that the insulation of the cable aging, this insulation aging dry phenomenon, usually occurs in the entire cable line.
As the cable insulation aging dry, so that insulation material to lose or reduce the insulation properties and mechanical properties, and thus prone to breakdown of fire burning, even along the entire length of the cable at the same time a number of burning fire.
When the oil-laying cable laying height difference is large, may occur cable drip phenomenon. The result of the flow, so that the upper part of the cable due to the loss of oil and dry, this part of the cable thermal resistance increases, so that the paper insulation coking and early breakdown.
In addition, because the upper part of the oil drips down, make room in the upper cable head and produce negative pressure, so that the cable is easy to absorb moisture and make the end of the damp.
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