The analysis of the qualitative impact of the capacitor capacitance and the test data prove that the capacitance yellow of the safety film explosion-proof capacitor and the capacitance of the ordinary metallized film capacitor are equally reliable and more reliable. At that time, the quality of the safety film produced by some domestic vacuum coating manufacturers had not yet passed the level completely, or the improper use of imported mesh safety films by capacitor manufacturers and the shortcomings of the structure of the safety film itself, plus some of the capacitor production process The process of important links is unreasonable, which leads to some quality problems in the safety film capacitors produced, such as rapid decline in capacitance. Most of the problems that arise are caused by substandard materials and process defects, not inherent problems of the safety film itself. Based on the test data and experience in the production practice over the years, this article focuses on the discussion of the impact on the capacitance stability of the capacitor from the graphic design of the safety film, the quality of the metallized film, and the production process of the capacitor. The relationship between the safety film graphic design and the capacitance and stability of the safety film capacitor. The difference between the safety film and the ordinary metallized film is that the vacuum film is filmed with a specific pattern and a very narrow insulation gap. The entire metallized polar plate is divided into many polar plate units with the same shape and a small area, and these polar plate units are connected to each other by a miniature fuse. During the development of safety membranes, experts have designed a variety of structural graphics, all of which have good explosion-proof effects. The safety film is the thickened side of the metallized electrode plate along the length of the metallized film near the contact with the gold spray layer, and there is a narrow insulation room to isolate the effective area of ​​the electrode plate from the part where the gold spray layer is connected At the same time, at the same time, a plurality of insulating gaps along the width direction of the metallization film are used to divide the metallization electrode plate into a number of parallelogram-shaped electrode plate units with the same area. Each polar plate unit is connected to the gold spray layer connection part through one or two or even miniature fuses (the number of miniature fuses is related to the size of the polar plate unit area).
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