What are the common quality problems of power cables?

I. What are the common quality problems of power cables? The quality of power cables directly affects the operational safety of the line. Once the line can not run safely and stably, the life and economic losses caused by the failure are unpredictable. Therefore, electric power staff should fundamentally prevent the occurrence of cable failures, minimize cable accidents, start from the details, and strive to achieve the goal of safe and stable power supply. Problems in the use of cables generally have two reasons. One is the use of poor-quality cables, and there is a big problem in the production of cables. The second is the improper use of cables or improper maintenance. Under normal circumstances, the surface scratches the cable in the detection process will be eliminated, but in the transportation or laying process may still be scratched by foreign objects, so before use must check whether the cable insulation is intact. Normal wire and cable is put into operation for too long a service life and has reached the end of its service life. Wire and cable itself and the center head of the insulation resistance decreases year by year, not up to the standard value of the rules, quality problems will also appear. If the production process of wire and cable center head skills are not in place, the oxidized film at the connection is not cleaned up, or the operator has oil and dust on his hands, sticking to the line core joints, increasing the touch resistance of the joints. Prolonged operation will cause great losses, and the heat emitted will be greater and greater, resulting in high center head temperature, insulation deterioration accelerated. In the process of manufacturing the center head of wire and cable, the insulation resistance decreases because the temperature is difficult to control and the insulation material is easily burned. Or in the heating process, due to uneven heating, small cracks or poor sealing on the end face, resulting in a decrease in insulation resistance and an increase in leakage current year after year. Poor quality of wire core connection, uneven thickness may not match well with the connector, resulting in poor contact surface. Under the action of high current load, the temperature of the joint is too high, accelerating the aging of insulation.

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