Re: 25 kV PT

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "resonance" <resonance@xxxxxxxxxxxx>



Yes, the PTs may be different than a normal nst or x-ray xmfr 
winding, so it might work.  I would advise caution so you don't get 
50 kV across one xmfr or that will cause failure in short order.

Best bet in this case would be call the mfgr and ask to speak to a 
sales engineer --- they could look up your part number and provide 
the correct advise.

Dr. Resonance

> Assuming the PT's in question can have one of their HV bushings 
> grounded, then I see no problem.  Since they are identical, their 
> secondaries are most certainly wound the same direction.  If one 
> were to reverse the LV connection to one of the PTs then when one PT 
> HV bushing goes positive, the other will go negative and you end up 
> with 50KV between the two ungrounded HV bushings of the two PT's. 
> The maximum voltage anywhere is 25KV with respect to ground so 
> neither PT sees the 50KV.
>
> I think the real question is can the PT have one of its HV bushings 
> grounded and if so, which one.
>
> Gerry R.