Re: [TCML] NST TESTING.

[jimlux <jimlux@xxxxxxxxxxxxx>]

On 6/16/18 4:21 PM, Donald Murray wrote:
> Boost or Buck: connect H1 to x1,  apply 100 volts to H1 and H2, read 
> volts across H2 and x2, should be 10% higher or lower, switch x1 and x2 
> to get other
> Has to do with the direction the coils are wound around the core. Some 
> old 2400 volt pole transformers were marked Additive or Subtractive.
except that a NST has a 125:1 turns ratio, so you're only going to see a 
<1% change in voltage.
2400V transformers have a 10:1 ratio which makes the buck/boost 
technique easier.
However, connecting line voltage to the HV windings and measuring the LV 
side isn't a bad idea - you should see about 1V, if you've got 120V on 
the HV windings.
You want to be *careful* since NSTs have a centertap connected to the 
case - the line voltage source should be isolated from the ground - 
otherwise, the case might be "hot" relative to earth ground (and the 
person who might touch it

http://home.earthlink.net/~jimlux/hv/xfmrmeas.htm

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