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Re: [TCML] NST TESTING.



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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