evcome new energy cables: share common quality problems of new energy cables

2023/06/20
Author: EVCOME-EV Chargers Manufacturers

The quality of power new energy cables directly affects the operation safety of the line. Once the line cannot run safely and stably, the life and economic losses caused by the failure are unpredictable. Therefore, our electric power workers should fundamentally prevent the occurrence of new energy cable failures, minimize new energy cable accidents, start from the details, and strive to achieve the goal of safe and stable power supply. There are generally two reasons for the problems in the use of new energy cables. One is the use of inferior new energy cables, and there are big problems in the production of new energy cables, and the other is improper use or maintenance of new energy cables. What are the causes of common problems with new energy cables? evcome new energy cable to tell everyone! Analyze common problems and causes of new energy cables. 1. The structure is unqualified. The thinnest point of the insulation layer thickness is lower than the minimum value specified in the standard, or the average thickness is lower than the nominal value, and there is a risk of breakdown during use. 2. The degree of cross-linking is unqualified. The degree of cross-linking does not meet the standard, the heat resistance of the new energy cable is unqualified, it cannot meet the working temperature requirement of 90°C, the short circuit is allowed to 250°C, and the electrical performance is greatly reduced. 3. The thickness of the bamboo-shaped new energy cable is uneven, and the appearance of the new energy cable is bamboo-shaped. Due to the different sections of the new energy cable, the heating of the new energy cable is uneven, which affects the insulation life. 4. Surface scratches. Under normal circumstances, new energy cables with scratches on the surface will be eliminated during the inspection process and will not be listed, but new energy cables may still be scratched by foreign objects during transportation or laying, so the insulation of new energy cables must be checked before use is it complete. The service life of normal wires and new energy cables put into operation is too long and has reached the end of its service life. The insulation resistance of the new energy cable itself and the center head of the wire is decreasing year by year, and it cannot reach the standard value of the regulations, and quality problems will also appear. New energy cables often run at full load. Due to the thermal effect of the current, the center temperature is too high, and the center insulation of new energy cables deteriorates. New energy cables are often subjected to large current impact loads or electrical equipment problems, forming cold and hot central insulation layers, frequent temperature changes, and temperature differences. Large, resulting in insulation deformation and brittleness, and deterioration of the center insulation. If the technology of the center head of the new energy cable is not in place during the production process, the oxide film at the connection is not removed, or there is oil and dust on the hands of the operator, which sticks to the joint of the wire core, which increases the touch resistance at the joint. Long-term operation will cause a lot of loss, and the heat emitted will become larger and larger, resulting in excessive temperature of the center head and accelerated insulation deterioration. In the manufacturing process of the wire new energy cable center head, when the heat shrinkable tube is heated, due to the difficulty in controlling the temperature, the insulating material is easy to burn and the insulation resistance decreases. Or during the heating process, due to uneven heating, small cracks appear on the end surface, or due to poor sealing, water is damp, resulting in a decrease in insulation resistance and an increase in leakage current year by year. The connection quality of the wire core is poor, and the uneven thickness may not match the connector very well, resulting in poor contact surface. Under the action of high current load, the temperature at the joint is too high, which accelerates the aging of the insulation. .

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