Re: Capacitor dielectric voltage rating

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mddeming@xxxxxxx 

In a message dated 4/28/07 1:44:46 A.M. Eastern Daylight Time, 
tesla@xxxxxxxxxx writes:
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

PE can rate from 450V/mil to 1200V/mil. How pure (absence of
contaminants) PE is will determine it's puncture voltage. It's hard
to know just buying PE roll stock. It's best to test it. If you have
a means of varying the voltage on a hv supply (such as a variac), you
can then do the test yourself.


Good Method. Experiment is the final arbiter of scientific reality.

Take several samples along the roll
and get a decent average of "that rolls" puncture voltage.


Nope. A cap doesn't break down at the dielectric's average value, it 
fails at the lowest-valued point the charge can find.
 Also, the dielectric constant of PE is 2.2 to 2.3.

This is really the only way to be sure. Anything else is a guess and
may not apply to the PE you purchase.

Take care,
Bart



Matt D.




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