Re: Series-ing Potential Transformers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Ed Phillips <evp-at-pacbell-dot-net> 

Tesla list wrote:
 >
 > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >
 > No, this won't work.  In a NST one winding is wound in a different direction
 > than the first winding.  This means that the outer end of one winding hits a
 > 60 Hz positive peak as the winding wound in the opposite direction is
 > hitting the 60 Hz negative peak.  The peak to peak voltage is twice what a
 > single winding would be.
 >
 > In the case of 2 PTs hooked with a common center ground and each PT has the
 > same winding direction, each PT would hit a postive peak and negative peak
 > at the same time so the output would not be twice what the single xmfr would
 > give.  Each PT would hit 14.4 kV and then back to 0 kV as their phased
 > outputs would be exactly matched.
 >
 > You can try it, but unless you have a very strange PT this won't work.
 >
 > Dr. Resonance

	Don't they have two "secondary" (LV end) terminals so you could hook
them in parallel with phases reversed?

Ed