What are the causes of power cable line failure and countermeasures?

I. What are the causes of power cable line failure and countermeasures? External damage: in the cable storage, transportation, laying and operation process may be subjected to external damage, in particular, has been running directly buried cable, in the ground construction of other projects vulnerable to damage. These accidents often account for 50% of the cable accident. In order to avoid such accidents, in addition to strengthening the cable storage, transportation, laying and other aspects of the quality of work, it is more important to strictly enforce the earth moving system. Protective layer corrosion: underground stray current of electrochemical corrosion or non-neutral soil chemical corrosion so that the protective layer failure, loss of insulation protection. The solution is, in the stray current intensive area of the installation of drainage equipment; when the cable line on the local soil contains damage to the cable lead package of chemical substances, the cable should be installed in the tube, and neutral soil for cable liner and cover, but also in the cable coated with asphalt. Over-voltage, overload operation: improper selection of cable voltage, in operation, suddenly high pressure into or long-term overload, may make the cable insulation strength is damaged, the cable breakdown. This needs to be strengthened by inspection, improve the operating conditions to solve the problem in a timely manner. Outdoor terminal head immersion: due to poor construction, insulation rubber is not filled, so that the terminal head immersion, and ultimately the explosion. Therefore, it is necessary to strictly implement the construction process regulations, careful acceptance; strengthen the inspection and timely maintenance. Leakage of oil from the terminal head destroys the sealing structure, causing the loss of impregnant drying at the end of the cable, increasing the thermal resistance, accelerating the aging of the insulation, and easily absorbing moisture, resulting in thermal breakdown. When oil leakage is found in the terminal head, inspection should be strengthened, and in serious cases, the power should be cut off and redone.

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