7 Common Causes of Cable Failures

1, external damage. Analysis of the operation in recent years, especially in the rapid economic development of Hai Pu Dong, 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, and sometimes serious damage may occur short-circuit faults, directly affecting the safe production of electric mizu and power units. 2, insulation moisture. This situation is also very common, usually occurs in the direct burial or row of pipes in the cable joints. For example: cable joints production is not qualified and do joints in humid climatic conditions, will make the joints into the water or mixed with water vapor, time and under the action of the electric field to form a water twig, gradually damage the insulation strength of the cable and cause failure. 3, chemical corrosion. Cable buried directly in areas with acid and alkali effect, often resulting in the cable armor, lead skin or outer sheath corrosion, 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 failure. Chemical: unit of the cable corrosion is quite serious. 4, 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 and the steel armor eddy current loss, insulation medium loss will also be produced at first additional heat, so that the temperature of the cable 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 weaknesses were broken, so in the summer, the cable failure is particularly more. 5, 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 cable joint failures occur from time to time. Construction personnel in the production of cable joints in the process, if there is a joint crimping is not tight, the heating is not sufficient and other original network, will lead to the cable head insulation is reduced, thus triggering accidents.

6. 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.

7. Normal aging of the cable body or other reasons such as natural disasters.

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