1. Long-term overload operation. Overload operation, due to the thermal effect of the current, the load current will inevitably lead to the conductor heating when passing through the cable. At the same time, the skin effect of the charge and the eddy current loss of the steel crucible and the loss of the insulating medium will also generate additional heat, thereby increasing the cable temperature.
2. Environment and temperature. The external environment and heat source where the cable is located can also cause excessive cable temperature, insulation breakdown, and even an explosion.
3. External force damage. From the operational analysis in recent years, a considerable number of cable failures are caused by mechanical damage.
4. The insulation is damp. It usually occurs at cable joints in direct buried or drained pipes. Over time, water branches are formed under the action of an electric field, which gradually damages the insulation strength of the cable and causes malfunction.
5. Cable connector failure. Cable joints are the weakest link in cable lines, and cable joint failures caused by direct personnel failure (poor construction) often occur.
6. Chemical corrosion. The cable is directly buried in the acid-base area, which often causes the cable armor, lead or outer sheath to be corroded. The protective layer is chemically corroded or electrolytically corroded for a long time, causing the protective layer to fail and the insulation to be lowered. Cable failure.
Yangzhou Fongming Cable Factory, a special cable expert around you.
