Due to different environments, power cable faults can vary. Understanding the reasons for power cable faults is important for effective prevention and minimizing cable damage. Generally, the main causes of power cable faults are as follows:

Mechanical Damage：

Mechanical damage to cables is a major cause of faults. This can occur during installation, due to vehicle pressure, external force, or cable joint and conductor damage caused by land subsidence. If a cable is damaged, faults are easily detectable and typically not severe. However, minor damage can worsen over time, posing a threat to cable operation and leading to significant economic losses.

Chemical Corrosion:

Many cables are buried underground, and soil conditions directly affect them. Acidic or alkaline soil can cause corrosion to buried cables, leading to cracking or puncturing of the outer protective layer. Without proper protection, cable insulation is compromised, increasing the risk of faults.

Moisture in Insulation:

Moisture in cable insulation, often at joints, can lead to insulation breakdown. Improper sealing during installation or exposure to moisture due to weather conditions can reduce insulation resistance, causing faults.

Insulation Aging:

Under the thermal effects of current flow, load currents can heat conductors and contribute to insulation aging. Skin effect and dielectric losses can also generate additional heat, raising cable temperatures and accelerating insulation deterioration.

Material and Manufacturing Issues:

Generally speaking, during the manufacturing process of cable insulation, many impurities can be generated. In the production of cable terminations, uneven wrapping of the insulation layer can occur. Additionally, differences in dielectric constants and the influence of power plant operations can lead to cable aging. Moreover, if the anti-soil capabilities of the cable sheath material are not up to standard, it can also easily cause cable aging.

To prevent cable faults, it's crucial to ensure proper installation, regular inspections, and maintenance. Protective measures against mechanical damage, moisture ingress, chemical exposure, insulation aging, and material defects are essential for the reliable operation of power cables.

Aug 03,2024