English 
한국어 
français 
Español 
русский 
Türkçe 
Pilipino 
Polska 
Malay 
Indonesia 
In the field of modern electronics technology, the reliability of capacitors is an essential guarantee for the stable operation of equipment. Among them, metallized polypropylene film capacitors are widely used in high-demand electronic equipment due to their unique self-healing properties. The self-healing property of metallized polypropylene film capacitors not only extends the operating lifespan of the capacitor but also significantly reduces the failure rate, making it one of the core advantages of metallized polypropylene film capacitors.
What Is the Self-Healing Property of Metallized Polypropylene Film Capacitors?
The self-healing property of metallized polypropylene film capacitors refers to the mechanism by which the dielectric film inside the capacitor can restore its insulating performance through self-repair when it breaks down due to defects or high voltage, ensuring the normal operation of the capacitor.
The Principle of Self-Healing in Metallized Polypropylene Film Capacitors
The metallized polypropylene film of metallized polypropylene film capacitors is the most fragile part of the capacitor and the area most susceptible to breakdown. Once breakdown occurs, a small hole of about 0.5–1 mm in the intruding medium will appear at the breakdown site. The size of this hole is related to the self-healing ability. When the breakdown occurs, the plasma rapidly diffuses and creates a high temperature, causing the metallized electrode to evaporate quickly. During this process, the distance between the electrodes and the length of the discharge area will increase. After the discharge stops, the high temperature in the discharge area will quickly cool down, causing some of the evaporated medium to condense and form an insulating halo around the electrode. This isolates the breakdown area, and the capacitor resumes normal operation.
Advantages of the Self-Healing Property of Metallized Polypropylene Film Capacitors
Reduce failure occurrence: The self-healing property of metallized polypropylene film capacitors can quickly eliminate local breakdowns, preventing the failure of the entire capacitor due to a single point defect, thus significantly reducing the failure rate.
Extend service life: After the breakdown point is repaired, the capacitor continues to operate stably without needing replacement, greatly extending its service life. This is particularly notable in long-term industrial and energy equipment.
Ensure high voltage stability: The metallized polypropylene dielectric itself has a high breakdown voltage, and the self-healing property further enhances the capacitor's adaptability to high-voltage environments, providing reliable support under harsh conditions.
Reduce maintenance costs: Since there is no need to replace the capacitor due to local breakdown, maintenance costs are significantly reduced. This characteristic is particularly important in application scenarios requiring high reliability.
Related SaiFu Capacitor Products
