Analysis Of Common Faults Of Power Cables

In the transmission and distribution of electricity, the quality, safe operation and construction of Insulation Piercing Connector play a significant role. If there are problems with the quality of power cables or there are faults in the construction and operation, huge losses will be caused. So, what are the causes of common power cable failures?

Common causes of power cable failure analysis

The most direct cause of cable failure is insulation breakdown. The common causes of failure can be summarized as follows:

1. Long-term overload operation

The power cable is in a high-current operation environment for a long time. If there are impurities or aging in the line insulation layer, coupled with the impact of external factors such as lightning on overvoltage, overload operation generates a lot of heat, and power cable failures are very likely to occur.

2. Insulation dampness

The poor manufacturing process of the cable will cause the protective layer of the cable to rupture; the sealing of the cable terminal joint is not enough; the cable protective cover is pierced or corroded by objects during the use of the cable. These are the main reasons for the dampness of the cable insulation. At this time, the insulation resistance is reduced, the current increases, and power failure problems are caused.

3. External force damage

External force damage is the most common cause of cable failure. After the cable is damaged by external forces, a large-scale power outage will occur. For example, during the construction of underground pipelines, the cable is broken due to the excessive traction of the construction machinery; the cable insulation layer and shielding layer are damaged due to excessive bending of the cable; the cable is overcut and the knife marks are too deep when it is cut and stripped. These direct external forces will cause certain damage to the cable.

4. Quality of cables and cable accessories

Cables and related accessories are two important cable materials, and their quality problems have a direct impact on the safe operation of power cables. The production of cables and their accessories and cable three-ends is prone to quality problems. For example, the cable will be damp due to poor sealing during transportation and storage; the insulation tube is roughly manufactured, the thickness is uneven, and there are bubbles in the tube; the three-end of the prefabricated cable cannot be accurately stripped; the designer does not manufacture the cable joint according to the requirements. In addition, inappropriate material selection and poor waterproofness during the design of cable products will also cause cable quality problems.

5. Chemical corrosion

Long-term current action will cause a lot of heat to the cable insulation. If the cable insulation work is in a bad chemical environment for a long time, its physical properties will change, causing the cable insulation to age or even lose its effect, and power failures will occur.