[Amps] Test versus working voltage for oil filled capacitor

[KA4INM]

On 04/14/2015 04:14 PM, Alan Ibbetson wrote:

> I have a pair of jumbo oil filled capacitors. They are each 6 x 6 x 12
> inches and weigh about 10 pounds. I wish to use them at 3KV off load and
> with a 2A ripple current under full load.

> The only markings I can read are 42uF and "test voltage 7500 volts" (in
> French).  What is the consensus on the likely safe working voltage? Is
> it likely to be well defined for this type of capacitor, in the sense
> that all have a standard de-rating factor applied?

    I would Hi pot it to 7600 Volts and if OK I would use them to 7500 
Volts, but their nature and robustness is still unknown they could have
been built to do any of several jobs not related to PS filtering,
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.