The insulation is damp. This condition is also common and generally occurs at Enameled Wire joints in direct buried or drained pipes. For example, if the enameled wire joint is unqualified and the joint is made under humid climatic conditions, the joint will be filled with water or mixed with water vapor. For a long time, R forms a water branch under the electric field effect, which gradually damages the insulation strength of the enameled wire and causes problems.
Chemical corrosion. The enameled wire is directly buried in the acid-base effect area, and the enameled wire sheathing, lead skin or outer sheath is often corroded. The protective layer is chemically corroded or electrolytically corroded for a long time, causing the protective layer to fail and the insulation to drop. The enameled wire is damaged; the corrosion of the enameled wire in the unit is quite serious.
Overloaded for a long time. Overloading, because of the thermal effect of the current, the load current will cause the conductor to heat up when passing through the enameled wire. The skin effect of the charge together with the eddy current loss of the steel stern and the loss of the insulating medium will also generate additional heat, and then increase the enameled wire temperature.
Enameled wire connector is faulty. The enameled wire connector is the thinnest link in the enameled wire line, and the enameled wire connector problem caused by the direct fault of the person (poor construction) often occurs. During the process of making the enameled wire joints, the construction personnel will cause the insulation of the enameled wire head to drop if there is a joint that is not tightly crimped or insufficiently heated, and then cause the incident. Environment and temperature. The external environment and heat source where the enameled wire is located may also cause excessive enameled wire temperature, insulation breakdown, and even an explosion.