What are some of the factors that cause cable insulation to degrade?

I. What are the factors that lead to the reduction of cable insulation?
External damage: from the analysis of the operation in recent years, especially in today's rapid economic development, a considerable number of cable failures are now caused by mechanical damage.
Insulation moisture: this situation is also very common, usually occurs in the direct burial or row of pipes in the cable joints. For example: the 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 failure.
Chemical corrosion: cable buried directly in areas with acid and alkali effect, often resulting in the cable armor, lead skin or outer sheath is corroded, the protective layer due to long-term exposure to chemical corrosion or electrolytic corrosion, resulting in the failure of the protective layer, the insulation is reduced, will also lead to cable failure. Chemical: the unit's cable corrosion is quite serious.
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 the first additional heat, so that the cable temperature rises. 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 cable insulation weakness is broken, so in the summer, the cable failure is also particularly high.
Cable joint failure: cable joints are cable lines in the assortment of weak links, by the direct fault of the personnel (poor construction) triggered by the failure of the cable joints often occur. Construction personnel in the production of cable joints in the process, if there is a joint crimping is not tight, heating is not sufficient and other original network, will lead to the insulation of the cable head to reduce, thus triggering accidents.
Environment and temperature: the external environment in which the cable is located and the heat source can also cause the cable temperature is too high, insulation breakdown, or even explosion and fire.
Other factors: the normal aging of the cable body or other reasons such as natural disasters.

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