film thickness: 4.8mm
width: 125mm
edge margin: 2.5mm
metal:aluminum, HE
edge resistance: 1-4 ohms/square
body resistance: 5-10 ohms/square
material: polypropylene, ht treophan
k=2.2 +/- .1
these are the film material properties, the cap ends up being 3.2 max diameter and 5.025 max...
there are design limitations I have and the size/shape is set in stone. So I am told this cap should be well capable of the voltage levels we are testing too that is the information I have to go off. My goal is to determine where/why this failure is occurring...production, curing, testing...etc...
Also i have been doing some reading and this is a complete shot in the dark but could a thiner layer of insulation on the exterior of the cap cause this problem? Basically the cap is wound and the 10-15 layers of thin cover wrap is put on. There is no other dielectric encloseure the cap is...
I did find what looked to be a "dent" that slightly showed on the surface and as I pulled back some layers it still showed.
I was un-able to get an answer from the EE's about the theoretical value which is a valid point, so I decided to calculate it myself. Do you an equation I can use? I'll...
Because it goes snap crackle and pop and yes it shorts out and the layers of the cap bubble and blister. when I cut open the cap and start to peal back the layers you can see the holes that have burned thru and when you trace them down I find that the damage goes about 1/4" depth.
strictly...
new to this project and have limited knowledge, but the failure is consistent thru all specimens so I am hoping someone could shed some light.
Film cap design is rated to 1650v
Failure-
Cap initially failed around 800v consistently, the curing time was adjusted and a ramping cycle was...