What are the causes of cable failure?

There are many reasons for cable failure, but there are mainly the following situations:

1. Damage caused by external force. According to the analysis of operation in recent years, especially in the process of rapid economic development, a large number of cable failures are caused by mechanical failures. For example, when the construction of cable laying device is not standardized, it is easy to cause mechanical damage; When civil engineering construction is carried out on directly buried cables, it is also easy to cause damage to running cables. Sometimes, if the damage is not serious, it will take months or even years to make the damaged parts completely break through the problem, and sometimes the damage may also cause short circuit failure, which directly affects the safe production of power units. Line fault detector

2. The insulation is wet. This can also be seen in many cases, usually buried directly in the ground or in a row of pipes at the cable connection. For example, unqualified cable joints and joints made under wet weather conditions will turn the joints into water or steam, which will form water branches for a long time under the action of electric field, gradually endangering the insulation strength of cables. Line fault detector

3. Chemical Corrosion If the cable is directly buried in an acid-base area, it will often form the armor, lead skin or outer protective layer of the cable. Long-term chemical corrosion or electrolytic corrosion of the maintenance layer will lead to the failure of the maintenance layer, the decline of insulation and the defects of the cable. Line fault detector

4. Long-term overload use. During overload operation, due to the thermal effect of current, when the load current passes through the cable, it will cause the conductor to heat up. The skin effect of charge, eddy current loss of steel armor and dielectric loss will also generate additional heat, thus increasing the temperature of the cable. When insulation is overloaded for a long time, too high temperature will accelerate insulation aging and lead to insulation fracture. Especially in hot summer, cable insulation will fail first because of the rising temperature of cable, so cable faults are especially common in summer.

Defendant: Huatian Electric Power, manufacturer of cable fault tester.