Capacitor is a complex thing, because it is composed of a lot of basic components, due to the raw material and manufacturing process, many small factories to produce the capacitor dielectric easily has the impurity, mechanical damage, pinhole, low cleanliness of.

The early damage of the capacitor due to manufacturing reasons. High-voltage capacitor: usually consists of a plurality of elements Shen which are connected in parallel, each element consists of an aluminum foil as electrode, the solid medium between electrodes. Coiling and made. Components of the plate area, due to raw materials and manufacturing processes and other reasons, medium may has the impurity, mechanical damage. Pinhole, low cleanliness of, which became the capacitor inherent risks. In the system are caused by various reasons of overvoltage, over current and around the high, low temperature, these weak points will cause dielectric breakdown.Will usually produce spark breakdown, further expand the scope, thus forming a multilayer circuit and the circuitelement. Element in series with the component breakdown voltage will increase and parallel with the element group will been shortened, so that residual series of voltage increased, by each component of the current also increased. Will lead to the various components of the rapidly aging, increases heat. Also under the action of high voltage will also produce partial discharge on the edge of the plate. Coupled with breakdown point discharge, impregnating agents released large amounts of gas, after a certain time, connected in series with the fault components of the series of other components will have breakdown, and there will be new series to be shorted. Series number is further reduced, component voltage further increases, over-current phenomenon more serious, further deterioration of the medium, a further increase in temperature electric arc and increases, impregnating agent will further release gas, and so on, component damage more and more, box shell is expanding more and more serious. In this case the fuse protection, relay protection should be timely fault capacitor excision, if not removed. Further breakdown will form a strong arc in the box shell, other parallel capacitor and the energy of the system of Chung, in a very short period of time the dielectric capacitor rapidly aging, expansion, and finally lead to expansion tank shell, serious will explode. This kind of accident for the user is unable to eliminate the, it belongs to the early damage of the capacitor, the cycle is usually about a year. Only the manufacturers to improve product quality,strengthen the detection means, in order to reduce the early damage rate. Therefore, in the choice ofcompensation capacitor, conditional units should be integrated, self-healing capacitor to choose reliable performance.