[Amps] Test versus working voltage for oil filled capacitor

[Nuno Lopes]

Hi Alan,

If they are the same as the one on F1FRV website him and some other French
guys use it, they use it with 4.3kV at 2.5A trafo.

2015-04-16 19:28 GMT+01:00 Alan Ibbetson <alan at g3xaq.net>:

> My original post had a misleading typo: my capacitors weigh 10Kg not 10lb
> each. Sorry. They sound very similar to the CDE ones from Henry that Jim
> describes.
>
> I have tested each unit for temperature rise when carrying 3A ripple
> current at 50Hz, using a carefully fused variac on UK mains. I clamped a
> temperature probe to the case for hands-free measurement. The bottom line
> is I can't see any temperature rise in one hour - confirmed by hand after
> removing the mains connection. I don't doubt these things are not purpose
> made for HT PSU applications but as far as ripple current goes they seem
> fine.
>
> I do not yet have the means to charge the caps to 3KV in finite time for
> hi-potting so I will need to scratch build a PSU using a junk box
> transformer I have.
>
> Thanks to everyone for your help.
>
> 73, Alan G3XAQ
>
>
> On 15/04/2015 14:38, Jim Thomson wrote:
>
>> ##  They will run fine at 3 kv no load.   Dunno about 2A ripple current
>> though.
>> They are light.  Mine were from henry radio, made by CDE.   8 x 4 x 12
>> and weighed
>> 30 lbs each, rated at 42 uf @ 4500 V.     Mount them vertically.
>> Also insulate them from any metal chassis, and metal sidewalls....and
>> also from
>> the 2nd oil cap.     IE:   Treat them  like hv electrolytics.  If you see
>> oil stating to leak
>> around the insulators, stop using them.  Your caps are no doubt pulse
>> type rated caps,
>> and they usually have high ESR.  On any pulse rated oil cap, don’t runt
>> them at any more than
>> 60% of their stamped rating.
>>
>> Jim  VE7RF
>>
>
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-- 

*73  Nuno   CT2IRY*