What causes power cable failures?

I. What are the causes of power cable failure?1, mechanical damage mechanical damage caused by power cable failure accounted for a large proportion of cable accidents. Some mechanical damage is very slight, at that time did not cause failure, but in a few months or even a few years after the damage site only to develop into a failure. 2, installation damage in the installation of accidentally touching the cable, the mechanical traction force is too large and strain the cable, or the cable is overly curved and damage to the cable; 3, direct external damage in the installation of power cables on the path of power cables or power cables near the city construction, so that power cables are subjected to direct External damage; driving vehicle vibration or shock load will cause the underground cable lead (aluminum) package crack damage; 4, insulation moisture insulation caused by moisture failure. The main causes of power cable moisture are: due to the joint box or terminal box structure is not sealed or poorly installed and lead to water; poorly manufactured cable, metal sheath with small holes or cracks; metal sheath due to foreign objects stabbed or corrosion perforation; 5, insulation deterioration and aging of the power cable insulation medium within the air gap under the action of the electric field produced by the ionization of the insulation to decline. When the insulation medium ionization, the air gap produces ozone, nitric acid and other chemical products, corrosion of the insulation; insulation in the water to produce hydrolysis of insulation fibers, resulting in insulation degradation. Overheating can cause insulation aging and deterioration. Power cable internal air gap produces electric ionization caused by local overheating, carbonization of insulation.

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