Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

How to pay attention to loss prevention of metal film capacitors | Focus on middle and high-end brand capacitor manufacturers

by:Shenmao     2021-03-28
The early damage of metal film capacitors is mostly due to manufacturing reasons. Due to raw materials and manufacturing processes, there may be impurities in the medium, mechanical damage, pinholes, low cleanliness, etc., and the system is affected by various causes of overvoltage, overcurrent, and surrounding high and low temperatures. The weak point of the metal film capacitor causes dielectric breakdown. Sparks are usually generated during breakdown, which further expands the range, thereby forming a multi-layer short circuit or even a short circuit of the entire component. The voltage on the element in series with the breakdown element will increase accordingly, so that the voltage on the remaining group will increase, and the current through each element will increase accordingly. It will cause rapid aging of various components and increase heat generation. At the same time, a partial discharge at the edge of the plate will also be generated under the action of a higher voltage. After a certain period of time, the metal film capacitors of the entire group connected in series with the faulty element will be broken down one after another, and a new group will be connected. The number of groups is further reduced, the component voltage is further increased, the overcurrent phenomenon is more serious, the medium is further deteriorated, the temperature is further increased, and the arc will further increase. The thickness of the metal film directly affects the self-healing performance of the capacitor. The thinner the metal film, the stronger its self-healing performance, but the weaker the bond with the sprayed gold layer. Metal film capacitors require that the metallized film not only has good self-healing performance, but also has enough thickness to increase the spray gold strength. In order to take into account these two points at the same time, foreign countries have produced a metal film with thickened edges and self-healing The capacitor is made of this kind of metalized film with thickened edges to wind the core. It can withstand the impact of surge current, has high reliability, good self-healing performance, and long service life. Its theoretical service life can reach a hundred years. If you want to know more information, please call the toll-free hotline 4006299138.
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