What are the reasons for the insulation reduction of automobile cables?

2025-04-17 15:05:39

During the maintenance of automobile cables, the prevention of insulation degradation is a very important issue. Otherwise, when the automobile cables are aged, the insulation performance will decline, and short circuit will easily occur. Especially in wet weather, the insulation performance of the Cable will be reduced, although the appearance of the cable is complete. When the water is immersed into the metal conductor, short circuit will occur and fire will occur. Do you know what causes the insulation of automobile cables to decrease? The reasons for the reduction of automobile cable insulation are as follows: 1. External force damage According to the operation analysis in recent years, especially in today's rapid economic development, a considerable number of automobile cable failures are caused by mechanical damage. 2. Damp insulation This kind of situation is also very common, and generally occurs at the car cable joint directly buried or in the exhaust pipe. For example, unqualified automobile cable joints and joints made under wet weather conditions will cause water or steam to enter the joints, which will form water branches under the action of the electric field for a long time, and gradually damage the insulation strength of the automobile cable and cause failure. 3. Chemical corrosion The automobile cable is directly buried in the area with acid and alkali action, which often causes the armor, lead or outer protective layer of the automobile cable to be corroded. The protective layer is subject to chemical corrosion or electrolytic corrosion for a long time, resulting in the failure of the protective layer, the reduction of insulation, and the failure of the automobile cable. 4. Connector failure Car cable connector is a relatively weak link in the car cable line. The car cable connector fault caused by the direct fault of personnel (poor construction) often occurs. In the process of making automobile cable joints, if there are reasons such as loose crimping and insufficient heating, the insulation of automobile cable head will be reduced, which will lead to accidents. 5. Long-term overload operation During overload operation, due to the thermal effect of the current, when the load current passes through the car cable, it will inevitably cause the conductor to heat up. At the same time, the skin effect of the charge, the eddy current loss of the steel armor and the loss of the insulating medium will also generate additional heat, which will increase the temperature of the car cable. During long-term overload operation, excessive temperature will accelerate the aging of insulation and lead to insulation breakdown. Especially in the hot summer, the temperature rise of automobile cables often leads to the breakdown of the weak insulation of automobile cables. Therefore, in the summer, there are many failures of automobile cables. 6. Environment and temperature The external environment and heat source of the automobile cable can also cause the temperature of the automobile cable to be too high, the insulation to be broken down, or the explosion and fire. To sum up, we can see that the main reasons for the reduction of automobile cable insulation are external force damage, insulation moisture, chemical corrosion, joint failure, long-term overload operation, environment and temperature. Of course, in addition to these six aspects, there may also be other reasons such as the normal aging of automobile cable body or natural disasters, which may lead to the reduction of automobile cable insulation.