Reasons and solutions for internal short circuits in filtering power capacitors

As an important reactive power compensation device in the power system, the safe and reliable operation of filtering power capacitors is conducive to improving the stability of the power system, enhancing power quality, and reducing power losses in the grid. However, due to factors such as equipment manufacturing quality, compensation circuit design, system harmonics, and operating environment, power capacitors occasionally fail. Let's analyze below.

The main causes of internal short circuit faults in filtering power capacitors are:

During long-term operation, the insulation medium of the filtering power capacitor ages, the internal insulation becomes damp, and it can withstand overvoltage.

2. There are issues with the design of the filtering power capacitor itself.

3. There are insulation defects in the manufacturing process of filtering power capacitors, which lead to penetrating insulation breakdown of the filtering capacitors.

When selecting filtering power capacitors, fine craftsmanship, good insulation, and dual protection devices for overvoltage and overcurrent should be chosen to effectively reduce internal short-circuit faults in filtering power capacitors.