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Do you know why your cable is aging
Nov 01, 2017

Cable with the use of time increase, will appear aging phenomenon, aging is not a problem, aging fault is the problem, in fact, many cable aging failures are avoidable, to avoid these situations, the longer the life of the cable

The most direct reason for the aging failure of wire and cable is that the insulation is lowered and penetrated. There are many factors that reduce the conductivity of insulation:

                                                                       External damage           


From the analysis of the operation in recent years, especially in the rapid economic development of the region, a considerable number of cable failures are caused by mechanical damage.

For example: Cable laying installation does not standardize construction, easy to cause mechanical damage; In the direct-buried cable to engage in civil construction is also very easy to run the cable damage and so on. If the damage is not serious, it will take several months or even years to cause the damage site to break down completely, the failure of serious damage may occur, directly affect the safety production of electricity units.

                                 Damp insulation              


This is also common, usually in the case of a cable joint in a straight-buried or pipe-tube.

For example: cable joint production unqualified and in humid weather conditions do joint, will make the joint water or mixed with steam, long time will be in the role of the electric field to form branches, gradually damage the insulation strength of the cable caused by failure.

                                   Chemical corrosion       


Cable buried directly in the area of acid and alkali, often lead to the cable armor, PB skin or the outer layer of corrosion, the protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in failure of the protective layer, insulation reduction, will also lead to cable failure.

                                  Long-term load operation       


Overload operation, due to the heat effect of the current, the load current through the cable will inevitably lead to fever, at the same time, the charge of the skin effect and the steel armor of the eddy current loss, dielectric loss can also generate additional heat, so that the cable temperature rise. Long-term overload operation, high temperature will accelerate insulation aging, so that insulation is penetrated. Especially during the hot summer months, the heating of the cable often leads to the breakdown of the cable insulation, so in the summer, cable failures are particularly numerous.

                                   Cable connector failure 


The cable joint is the weakest link in the cable line, the cable joint fault caused by the direct negligence of the personnel (bad construction) often occurs. Construction personnel in the production of cable joint process, if there is a joint pressure is not tight, insufficient heating and other reasons, will lead to the cable head insulation lower, resulting in accidents.


                          Environment and temperature      


The external environment and heat source of the cable will also cause the high temperature of the cable, the breakdown of insulation and even the explosion of fire.

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