Common failure mode of capacitor

The common failure modes of capacitors are: breakdown, opening, and electrical parameters (including excess capacity of capacitance, increase of tangent value of loss angle, loss of insulation performance or leakage current up and off), leakage, lead corrosion or fracture, insulator rupture or surface arc. The cause of capacitor failure is a variety of various kinds of capacitors. The material, structure, manufacturing process, performance and use environment are different, and the failure mechanism is different. The main mechanism of various common failure modes is summarized as follows.
Seven common failure modes
Main failure mechanism of capacitor breakdown
(1) dielectric materials have defects or defects, or contain conductive impurities or conductive particles.
Electrical aging and thermal aging of the dielectric.
(3) the electrochemical reaction inside the dielectric;
(4) the migration of silver ions;
The dielectric is subjected to mechanical damage during the manufacture of capacitors.
(6) changes in the molecular structure of the dielectric;
In the environment of high humidity or low pressure, interpolar arc;