What are the reasons for determining power cable faults?

I. What are the reasons for determining power cable failure? Power cables are cables used to transmit and distribute electrical energy, power cables are commonly used in urban underground power grids, power station lead lines, internal power supply of industrial and mining enterprises and underwater transmission lines across rivers and seas. In the power lines, the proportion of cables is gradually increasing. Power cables are used to transmit and distribute high-power electrical energy in the backbone of the power system cable products, including 1-500KV and above, a variety of voltage levels, a variety of insulated power cables.1. external damage: in the cable storage, transportation, laying and operation may be subjected to external damage, in particular, has been running directly buried cables, in the construction of other projects on the ground are prone to damage. Such accidents often account for cable accidents. 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 implement the earth moving system.2. Protective layer corrosion: underground stray current galvanic corrosion or non-neutral soil chemical corrosion so that the protective layer failure, the loss of the protective effect of insulation. 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 pipe, and neutral soil for the cable liner and cover, but also in the cable coated with asphalt. 3. outdoor termination of the head of the immersion: due to poor construction, the insulation rubber is not filled, so that the termination of the head of the immersion of the end of the explosion. Therefore, the construction process should be strictly enforced, careful acceptance; strengthen the inspection and timely maintenance. Terminal head oil leakage, damage to the sealing structure, so that the cable end of the impregnant loss of dry, thermal resistance increases, insulation accelerated aging, easy to absorb 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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