The Self-healing Property of Film Capacitors

Film capacitors use metal foil as the electrodes, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate as the dielectric. According to the type of plastic film, there are polyethylene capacitors (also called Mylar capacitors), polypropylene capacitors (also called PP capacitors), polystyrene capacitors (also called PS capacitors) and polycarbonate capacitors.

Film capacitors have self-healing properties. It is mainly divided into discharge self-healing and electrochemical self-healing. Because of this feature, a film capacitor does not need to be replaced even if it is damaged many times. In many cases, it can heal itself, thus reduce the cost of maintenance, and the time for troubleshooting.

While the film capacitor can heal itself, there is one point that everyone needs to pay attention to: the capacitance of the capacitor used is gradually reduced. If the number of self-healing times the film capacitor withstand increases, its capacitance and insulation resistance will decrease, and the loss angle will increase significantly, which will make the capacitor fail more quickly. Therefore, it is necessary to use a film capacitor in proper situation as to avoid triggering the self-healing property of film capacitor.

It is necessary to choose a good manufacturer when purchasing film capacitors. We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer.Our factories are ISO 9000 and ISO 14000 certified. If you have technical questions or need samples, please contact us: https://www.jeccapacitor.com/