Common quality problems of evcome cable sharing cable

2023/06/21
Author: EVCOME-EV Chargers Manufacturers

The quality of the power cable 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 cable faults, minimize cable accidents, start from the details, and strive to achieve the goal of safe and stable power supply. There are generally two reasons for problems in cable use. One is the use of inferior cables, and there are big problems in cable production. The second is improper use or maintenance of cables. What are the causes of common cable problems? evcome cable will tell you! Analyze the common problems and causes of 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 cable is unqualified, the working temperature is 90°C, the short circuit is allowed to be 250°C, and the electrical performance is greatly reduced. 3. Bamboo-shaped The thickness of the cable is uneven, and the shape of the cable is bamboo-shaped. Due to the different sections of the cable, the heating of the cable is not uniform, which will affect the insulation life. 4. Surface scratches. Under normal circumstances, cables with scratches on the surface will be eliminated during the detection process, but they may still be scratched by foreign objects during transportation or laying, so it is necessary to check whether the cable insulation is complete before use. The service life of normal wires and cables is too long and has reached the end of their service life. The insulation resistance of the wire and cable itself and the center head has decreased year by year, failing to reach the standard value, and quality problems will also appear. The cable is often operated at full load. Due to the thermal effect of the current, the temperature of the center head is too high, and the insulation of the cable center head is deteriorated. The insulation is deformed and brittle, and the insulation of the center head is deteriorated. If the skills of the wire and cable center head are not in place during the production process, the oxide film at the connection is not cleaned, or the operator has oil and dust on his hands, which will stick to the wire core joint and increase the contact 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 process of manufacturing the center head of the wire and cable, because the temperature is difficult to control, the insulating material is easy to burn, so the insulation resistance is reduced. Or during the heating process, due to uneven heating, small cracks appear on the end face or poor sealing, 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 large current load, the temperature of the joint is too high, which accelerates the aging of the insulation. .

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