I have a couple of fuel oil ignition transformers I use for this exact
purpose. They are rated at 23mA and they actually work very well as
current limited sources. They will produce 10kV @ 23mA or 100V @ 23mA.
For current limiting I use a Caddock MX-450 5meg ohm 5W resistor.
See
http://www.caddock.com/Online_catalog/high_resistance/high_resistance.html
For test voltages < 7kV a single resistor works fine and I use 2 in
series above 7kV. Two resistors are needed for power dissipation and
not voltage breakdown.
73,
Larry, W0QE
On 7/18/2012 9:24 AM, Bill, W6WRT wrote:
> ORIGINAL MESSAGE:
>
>> Mike K4GMH wrote:
>>
>>> Can a 10 kV, 30 mA., xfmr used for a neon light be used in a hi-pot tester?
>>> Seems like a natural with just a small variac used to vary the primary
>>> voltage (120 VAC) for adjusting the output voltage.
> REPLY:
> 30 mA is a lethal amount of current. Be sure to use some form of current
> limiting so the short circuit current is a fraction of a mA. The test will be
> just as valid and no harm to either you or the item under test (probably).
>
> 73, Bill W6WRT
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