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Affect the cable life of seven factors
Electricity use and our life is closely related to the production of all walks of life are inseparable from the electricity, electricity cannot be separated from the cable, then the service life of the cable has a direct impact on the safety of production, cable life is induced by the oxidation of the jacket material Period of decision, the general use of cable design 30 years, the actual life is far greater than this value.
The most direct cause of cable aging failures is a breakdown of the insulation and breakdown. There are many factors that lead to the reduction of cable insulation. The following situations are summarized according to the actual operating experience.
1, external damage
Judging from the operational analysis in recent years, especially in the rapid economic development today, a considerable number of cable faults are caused by mechanical damage.
2, insulation damp
This situation is also very common, usually occurs in the buried or pipe cable connector. For example, unqualified cable connectors and joints in humid climates will make the joints into the water or water vapor, water for a long time under the action of the electric field to form branches, and gradually damage the dielectric strength of the cable and cause failure.
3, chemical corrosion
The cable buried directly in the role of acid and alkali areas, often result in cable sheathing, lead or outer sheath corrosion, protective layer due to long-term chemical corrosion or electrolytic corrosion, resulting in protective layer failure, insulation will also lead to Cable fault.
4, long-term overload operation
Due to the thermal effect of the current, the load current will inevitably lead to the heating of the conductor when it passes through the cable. At the same time, the skin effect of the charge and the eddy current loss of the steel armor will also generate additional heat at the dielectric loss, so that the temperature of the cable rises. Long-term overload operation, the high temperature will accelerate the aging of insulation and even insulation breakdown. Especially in hot summer, the cable temperature rise often leads to the breakdown of the cable insulation is the first to be punctured, so in the summer, the cable fault is particularly large.
5, cable connector failure
The cable connector is a weak link in the cable line, the direct fault of personnel (poor construction) caused by the cable connector failure often occurs. Construction workers in the production of the cable connector, if the connector pressure is not tight, inadequate heating and other original networks, will lead to lower cable insulation, which led to accidents.
6, the environment and temperature
The external environment and heat source in which the cable is located can also cause overheating of the cable, breakdown of the insulation, and even explosion and fire.
7, other factors
Normal aging of the cable body or other reasons such as natural disasters.
Several factors affecting the service life of the cable have been introduced to everyone finished, in the procurement and use of wire must take into account these factors, I hope for your help, if you have any questions about wire and cable, please consult us!
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