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Forums
4hv.org :: Forums :: High Voltage
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My first spark

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Andy
Mon Dec 03 2012, 09:25PM Print
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
 		Just got my first spark ,seeing what a 15kv nst can do. Its spaced 1cm apart I thought i'll need 30kv..


1354569942 4266 FT0 Firstspark
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Steve Conner
Mon Dec 03 2012, 10:04PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Yay! smile

The 30kV/cm rule is a theoretical limit, it doesn't hold for electrodes with sharp points or uneven surfaces.

Also, a NST can make more than its rated voltage during the transient at switch-on.
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dex
Tue Dec 04 2012, 10:14AM
dex Registered Member #2566 Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
 		try "needle-plane" gap.with 15 kV nst (21.2 kV AC voltage peak) arcing over 1.5-2 cm gap is possible.
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Proud Mary
Tue Dec 04 2012, 11:53AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Steve Conner wrote ...

a NST can make more than its rated voltage during the transient at switch-on.

I determined by experiment that a Tunewell 5 kV - 0 - 5 kV 30mA NST developed 14 kV across its unloaded secondary, which only fell to the nominal 10 kV when 8 mA was drawn.
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Steve Conner
Tue Dec 04 2012, 12:56PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Peak or RMS? tongue
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Proud Mary
Tue Dec 04 2012, 01:36PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Steve Conner wrote ...

Peak or RMS? tongue

Just for you, Steve, I will re-measure the unloaded secondary output with an electrostatic RMS voltmeter this evening, and report back accordingly.
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Patrick
Tue Dec 04 2012, 10:17PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...

Steve Conner wrote ...

a NST can make more than its rated voltage during the transient at switch-on.

I determined by experiment that a Tunewell 5 kV - 0 - 5 kV 30mA NST developed 14 kV across its unloaded secondary, which only fell to the nominal 10 kV when 8 mA was drawn.

when i was engineering my HV probes, i measured my own 12kv 33ma NST and it measured supprisingly high(unloaded), there are scope pics somewhere here on the forum...
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Ash Small
Tue Dec 04 2012, 11:29PM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		This fact is well known in the fusor community, etc,

NST's are used to ignite plasmas, much the same as arc welders. They are designed to have a high open circuit voltage.
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GrantX
Wed Dec 05 2012, 01:40AM
GrantX Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
 		Congrats on finding a nice NST! They're getting harder to find every year. What make/model is your one? From the looks of the arc it's a 30ma NST?

I've had a 15kV/60mA NST for over 2 years now and it's been great. Very versatile and handy when you need some serious potential in a pinch. I also have a 6kV/30mA and a 12kV/60mA unit sitting around. The 6kV transformer is currently powering (for the first time ever!) a smiley face neon sign in my workshop, since it's dodgy ebay high frequency unit crapped out after 20 mins of runtime :p Iron all the way!
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Andy
Wed Dec 05 2012, 02:08AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
 		yep 30ma ene245-15030 daehan, plan on use it for this, should be fun :)
1354673330 4266 FT147459 Marxsetup
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