Re: [TCML] Calculating transformer output at lower voltages

[ED <evp@xxxxxxxxxxx>]

I haven't observed this either but did have one total disaster feeding 
the primary of a capacitor-load 15 kV, 60 ma transformer with low 
voltage from a variac.  As I increased the voltage the magnetizing 
inductance must have increased so much that the secondary went into 
resonance, the voltage jumped from a hundred volts or so up to enoug kV 
to blow up the 1000V range on my Simspson 260.  Ferroresonace with a 
vengeance!!!!!!!  Feeding the secondary seemed to work OK.

Jim Lux wrote:

> On 6/8/12 9:45 AM, Gary Lau wrote:
>
> > Hi Jim,
> >
> > I must disagree with your post.  The advice is often given to 
> > determine an
> > NST's secondary voltage by feeding 120VAC to the secondary and measuring
> > the resulting Vprimary, this makes sense.  However, having tried 
> > this, it
> > doesn't work. There's some very non-linear stuff going on with NST's, 
> > even
> > well below saturation.  There was a thread on this topic several 
> > years ago,
> > I don't recall the resolution.
>
> Interesting...
> I haven't encountered this.. I've measured a variety of high leakage 
> inductance transformers.. although only one NST.
>
>
>
>
>
>
>
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