🌟Metal film capacitors have obvious advantages over metal foil electrode capacitors, that is, “self-healing.”
✨“Self-healing”: The vacuum deposition metal attachment directly attached to the plastic film is only 20-50mm. If there are weaknesses, defects or the dielectric strength of the insulator in the mixture in the insulator is exceeded, the insulator will be broken down. The arc-shaped discharge of energy in the fading channel can evaporate all the thin metal outer layers passing nearby. The rapid extension of the plasma in the fading channel cools it in tens of milliseconds, and the discharge ends. In this way, the insulating area allows the previously imperfect area of the capacitor to regain the full performance of the capacitor.
✨Since the loss of any form of pressure in the respective insulating layer and a good homogeneity improve the self-healing ability, a capacitor with a good surface layer has better self-healing performance than a capacitor with a damaged surface layer.
🌟Metal-coated capacitors have many advantages, and these advantages are particularly obvious in the large rated capacity.
✨Because of the metal-coated design, it can also be applied to some more complex capacitor designs. For example, it is used to handle multiple internal series couplings of high DC voltages and high AC loads.
✨In capacitors that require high current pulses and high di/dt, the combined application of metal foil, metal film and metal-free film can be used to make the capacitor carry extremely high current and self-healing.