How are a few causes of cable aging?

I. How are several causes of cable aging? Wire and cable aging failure is the most direct cause of insulation reduction and breakdown. Lead to insulation reduction of many factors, according to the actual operating experience, summarized in the following cases. 1) cable aging causes: external damage. From the analysis of the operation in recent years, especially in the rapid economic development of Shanghai Pudong, now a considerable number of cable failures are caused by mechanical damage. For example: cable laying and installation of non-standardized construction, easy to cause mechanical damage; in the direct burial of cables to engage in civil construction is also very easy to run the cable damage, etc.. Sometimes if the damage is not serious, it takes months or even years to cause damage to the part of the complete breakdown of the formation of faults, sometimes serious damage may occur short-circuit faults, directly affecting the power plant and the safe production of the power unit. 2) cable aging reasons: moisture insulation. This situation is also very common, generally occurring in the direct burial or row of pipes in the cable joints. For example: cable joints production is not qualified and in humid climatic conditions to do joints, will make the joints into the water or mixed with water vapor, time in the electric field under the action of the formation of water twigs, and gradually damage the insulation strength of the cable and cause failures. 3) cable aging causes: chemical corrosion. Cable buried directly in the acid and alkali effect of the region, often resulting in the cable armor, lead skin or outer sheath is corroded, the protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in the failure of the protective layer, the insulation is reduced, but also lead to cable failures. 4) cable aging causes: long-term overload operation. Overload operation, due to the thermal effect of the current, the load current through the cable will inevitably lead to conductor heating, while the skin effect of the charge as well as the eddy current loss of steel armor, insulation dielectric loss will also produce additional heat, thereby increasing the temperature of the cable. Long-term overload operation, the high temperature will accelerate the aging of the insulation, so that the insulation is broken. Especially in the hot summer, the temperature rise of the cable often leads to the first breakdown of the cable insulation weakness, so in the summer, the cable failure is particularly high. 5) cable aging causes: cable joint failure. Cable joints are the weakest link in the cable line, by the direct fault of the personnel (poor construction) triggered by the failure of the cable joints occur from time to time. Construction personnel in the process of making cable joints, if there is a joint crimping is not tight, heating is not sufficient and other reasons, will lead to the cable head insulation is reduced, thus causing accidents.6) Causes of cable aging: environment and temperature. The external environment in which the cable is located and the heat source can also cause the cable temperature to be too high, insulation breakdown, and even explosion and fire

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