The cause of the early damage of the capacitor(I)

Most of the early damage to capacitors is due to manufacturing reasons. High voltage capacitors are usually made up of multiple components in parallel. Each element is made of aluminum foil, and the solid dielectric is wound between electrodes. The area of the plate is very large. Due to the raw materials and manufacturing technology, there may be impurities and mechanical damage in the medium. Pinhole and low cleanliness are the inherent dangers of capacitors. These weak points cause dielectric breakdown in the system due to overvoltage, overcurrent and high and low ambient temperature caused by various reasons. Breakdown usually produces sparks, further enlarging the range, resulting in multi-layer short-circuit or even short circuit of the whole element.