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Re: 25 kV PT

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
On a 3 phase delta system with 24KV phase to phase, the voltage on any one phase will be 13856V with respect to ground. If this PT was connected to such a system, the maximum voltage on each bushing would be this 13856V with respect to core presumably grounded. Certainly, if one operates the PT backwards at rated LV and grounds one of the bushings, the bushing voltage would be stressed to 24KV. Is there any data suggesting the HV insulation would not withstand this given the BIL rating?? 

Gerry R.




Original poster: "Dr.Hankenstein" <Dr.Hankenstein@xxxxxxxxxxxxx>

It isn't a center tapped transformer; it's an indoor compartment rated PT
intended to be hooked to a 3 phase delta ungrounded system running 24kv
phase-to-phase. Grounding either end may cause the "high" ends' insulation
to fail, resulting in flashover thus ruining the PT.

BTW: GE model 350 butel PT's are rated for use on 69kv equipment, outdoors,
in the rain, etc.... and they are dry type.


> [Original Message]
> From: Tesla list <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Date: 2/2/2007 11:35:38 PM
> Subject: Re: 25 kV PT
>
> Original poster: Mike <megavolts61@xxxxxxxxx>
>
> Trying to run 50 kV on any transformer that is not in oil is a
> receipe for disaster.
>
> Dr. Resonance
>
> Why is that if it's center tapped and +/- 25kV?  Granted the primary
> tank wiring better be well thought out due to corona and all. Tesla
> used 50kV transformers at times
> Mike
>
>
>
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