Metallized film capacitors are one of our common life of common capacitors, metalized film capacitors have a self-healing of the superior performance and is well-known, we talk about two key points, resulting in failure causes the thin film capacitor which, hope to the content of this article can help you, with a look down!
1. The partial discharge caused by
Since the minute air gap, metal capacitors' over-healing "during processing caused by the presence of air gaps in the medium, leading to metallized film capacitors at a high partial discharge voltage is applied, the capacitor internal lot of heat quickly, distribute too late, and result further damage to the surrounding medium, the partial discharge increased, creating a vicious cycle.
2. The loss due to the temperature rise of the capacitor
An ideal capacitor is not dissipated when the amount of work, but because of the dielectric loss and the internal resistance and contact resistance of metal capacitors, the capacitor configuration presents significant characteristics. Resulting in under load heat metalized film capacitor, and to look through the capacitor will dissipate heat to the surrounding environment, to establish a temperature gradient between the exterior from the intermediate to, when the calorific hours, heat balance hair; when heat, hair heat can not balance, the capacitor temperature, resulting in failure, causing expansion of the housing, deformation, cracking, film melted into a mass, and in severe burn and so find. To this end, a source of heat loss in the main cause of failure of the metalized film capacitor.