The causes and corrective measures for the abnormal bulging of self-healing parallel capacitors

Self-healing parallel capacitors, as widely used reactive power compensation devices in power systems, have the problem of bulging deformation, which directly affects the safe operation of the equipment and the reliability of the system. Therefore, what are the causes of the abnormal bulging shape of self-healing parallel capacitors and what are the corresponding improvement measures?

I. Analysis of the Multidimensional Causes of Bulge and Deformation Phenomena

1. Impact of overvoltage conditions:

The system voltage has been operating for a long time beyond the rated value.
Handling transient processes such as overvoltage and lightning strikes
The equivalent overvoltage effect caused by harmonic voltages

2. Factors causing abnormal temperature:

The environmental temperature is beyond the permitted operating range.
Excessive temperature rise due to poor heat dissipation conditions
Local overheating caused by the heat radiation from adjacent devices

3. Degradation of internal medium:

Cumulative damage to the medium resulting from repeated application of the self-healing property
The performance degradation caused by the oxidation of metallized films
Insulation performance degradation caused by partial discharge

II. Systematic Rectification and Preventive Measures

1. Optimization of operating conditions:

Strictly control the working voltage within the rated range.
Improve the ventilation and cooling conditions of the installation environment
Set reasonable limits on the frequency of switching operations

2. Improvement of Equipment Selection:

Select products with a stronger ability to withstand voltage.
Consider the adaptability to environmental temperature characteristics

3. Installation and Maintenance Specifications:

Ensure sufficient installation spacing and cooling channels
Use a vibration-proof fixation method
Establish a regular infrared temperature measurement inspection system