Views: 0 Author: Site Editor Publish Time: 2018-11-23 Origin: Site
Previous editors talked about the superiority of the pressure and shock resistance and temperature characteristics of film capacitors. These properties make film capacitors widely used in automobiles. What this article is about is its self-healing.
An important indicator of the ability of a capacitor to withstand overvoltage is self-healing. When the operating voltage is higher than the rated value, the short circuit may occur due to the breakdown of the film medium at a certain position. But the arc will cause the metallization layer of the breakdown point to melt and vaporize. During this time, the length of the discharge zone continues to expand and become larger.
After the end of the discharge, a part of the vaporized medium will be agglomerated due to the sudden drop in the temperature of the discharge area. At this time, an insulating layer will appear quietly around the discharge electrode to separate the breakdown area. Let the two poles of the capacitor work normally without being affected by its insulation. So make the reliability of the work a step!
It is this performance of the film capacitor that makes the anti-surge voltage capability of the film capacitor reach 1.5 times the rated voltage that is difficult for ordinary capacitors. At the same time, due to the use of metallized split film technology in the plastic film medium of film capacitors, the possibility of short-circuit breakdown does not occur in theory, which makes the film capacitors strengthen their withstand voltage, and the guarantee will theoretically Take it to the next level.
