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Forums
4hv.org :: Forums :: High Voltage
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NST rewiring

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Hhhhhhhhh
Thu May 15 2008, 10:32AM Print
Hhhhhhhhh Registered Member #1340 Joined: Thu Feb 21 2008, 12:47AM
Location:
Posts: 23
If I turn the hv winding around on one side of a NST both HV leads will ark to the core but not to each other. Making a 12kv 30ma transformer in to a 6kv transformer. My question is would the 30ma go up or stay the same?
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Mathias
Thu May 15 2008, 11:31AM
Mathias Registered Member #1381 Joined: Fri Mar 07 2008, 05:24PM
Location: Hungary
Posts: 74
No , why would the induced current change if you only made a 180 degree phase shift to one of the windings???
if you want more current then connect the the windings in parallel (or just use one winding if it can handel the 60ma)
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Dr. Dark Current
Thu May 15 2008, 12:20PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
HajiWatts wrote ...

If I turn the hv winding around on one side of a NST both HV leads will ark to the core but not to each other. Making a 12kv 30ma transformer in to a 6kv transformer. My question is would the 30ma go up or stay the same?
I think if you turn the HV coil "upside down", the direction of the winding will still be same so you will still get 12kV between the outputs. You would need to rewind the coil in the other direction in order to do what you want. Then if you connect the coils in parallel, the current would be 2x30mA=60mA.

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Hazmatt_(The Underdog)
Thu May 15 2008, 06:28PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
When the coils are both in phase you will have a situation where the hot lead arcs to the ground, but not hot to hot. If you parallel your hot leads then yes you do double the current when the coils are the same phase.
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Hhhhhhhhh
Fri May 16 2008, 07:20AM
Hhhhhhhhh Registered Member #1340 Joined: Thu Feb 21 2008, 12:47AM
Location:
Posts: 23
once or twice when i was making repairs to the windings I put it back together wrong, and then when i parallel it with other nst I could tell something wasn't corect. But was thinking, if i change the winding on two more nst I could get lots of cerent with less transformers.

my coil is running good right now but I'm sure I will run out of stuff to put to top and then Ill take apart the nsts again and try it.

Hmm lower voltage would be better for caps. one hot wire that could be good.

here is a link to pics of the nst
Link2

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Steve Conner
Fri May 16 2008, 09:25AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Good work unpotting and cleaning up all those NSTs, sir smile I never thought of trying to reverse one of the coils, but I guess it would work like you said.
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Hhhhhhhhh
Fri May 16 2008, 09:52AM
Hhhhhhhhh Registered Member #1340 Joined: Thu Feb 21 2008, 12:47AM
Location:
Posts: 23
Would it make 30ma into a 60ma??

i don't have a meter to test the output.

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Steve Conner
Sat May 17 2008, 08:10AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think the consensus of this thread was yes. Half the voltage, twice the current.

Even without measuring it, you should be able to see the arc has got hotter and fatter than before.
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