What problems should be paid attention to when choosing metal film capacitors|Focus on mid-to-high-end brand capacitor manufacturers

Metal film capacitor is a complicated thing because it is composed of many basic components. Due to the raw materials and manufacturing process, many small factories produce capacitor dielectrics that are prone to impurities, mechanical damage, pinholes, and low cleanliness. . This has become a hidden danger inherent in capacitors. The early damage of metal film capacitors is mostly due to manufacturing reasons. Due to the raw materials and manufacturing process, the above-mentioned problems occur, and the system is affected by various causes of overvoltage, overcurrent, and the surrounding high and low temperatures. These weak points will cause 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, other elements 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. In this case, the faulty metal film capacitor should be removed in time, if it cannot be removed. Further breakdown will form a strong arc in the case, and the influx of energy from other systems will make the metal film capacitor dielectric rapid in a short time Aging and swelling will eventually lead to the expansion of the box shell. In severe cases, it will explode. This kind of accident cannot be eliminated for users. It belongs to the early damage of metal film capacitors, and the cycle is usually about one year. Only try to improve product quality and strengthen detection methods in order to reduce the early damage rate. Therefore, when choosing metal film capacitors, qualified units should try their best to choose metal film capacitors produced by well-known companies. Shenmao metal film capacitors are made of imported raw materials from South Korea and domestic first-class craftsmanship. The quality is guaranteed. For details, please call the toll-free hotline 4006299138.

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