Insulation Resistance and tangent delta in a X Capacitor

[ernd59]

Hallo,

I have a question which elements are responsible for the increase of tangent delta in a X Capacitor and the reduction of its insulation resistance?

 

[Babadag]

X Capacitor it is a metallized film capacitor. See:
X and Y Capacitors.
http://www.kemet.com/Lists/Filestore/EvoxRifaRFIandSMD.pdf
Insulation degradation in a film capacitor see-for instance:
https://cds.cern.ch/record/2038610/files/45-56-Gallay.pdf