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4hv.org :: Forums :: High Voltage
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1.0 KVA Mini Pig

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KeeDx3
Mon Mar 13 2017, 04:34AM
KeeDx3 Registered Member #61435 Joined: Thu Jan 19 2017, 06:46AM
Location:
Posts: 25
So I've had this Mini Pig sitting in my closet for a while now (yep you read that right), and I'm starting to explore different projects I could use it for. I'm just scratching the surface of tesla coils (using NST's, etc) so I'm nowhere near ready to actually power it up, nor do I have a ballast yet. I'm mostly looking toward the future and when I get to that point (both in ability and workspace).

The voltage rating is 4800, so probably no monster coils, but I'm curious about just how big I could go with this thing ("how many MOT's is this comparable to"). Only paid $50 for it and I don't think it has ever been used! If nothing else, it just looks cool.

203 Zpsgf4b46gc

204 Zpsortna2xj

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johnf
Mon Mar 13 2017, 05:59PM
johnf Registered Member #230 Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
Its equal to one MOT but it will do that continuously unlike a MOT
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Sulaiman
Mon Mar 13 2017, 07:24PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
John Freau developed an empirical formula for spark gap Tesla Coils

Spark Length in inches = 1.7 x sqrt(power)

using this approximation, 1000W = 53" = 1.36m

I think that was for a rotary spark gap, probably synchronous but I'm not sure.
It is not an exact formula, but gives a good 'performance' target.

So with reasonable care, 1 yd./m should be achievable .....
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KeeDx3
Wed Mar 15 2017, 05:22AM
KeeDx3 Registered Member #61435 Joined: Thu Jan 19 2017, 06:46AM
Location:
Posts: 25
Thanks for all the info!

So what should I be looking at to ballast this? Is an arc welder still the way to go, or can I go smaller? I'm not quite adventurous enough to rewind my own MOT's, so something that already exists in the real world would be best.

I do have an old variac (more specifically, a Superior Electric Powerstat Transformer Dimmer) rated for 16.7 amps, 2000 watts.

I still have a lot to learn about ballasting, so I'm not sure if that would even work.
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Sulaiman
Wed Mar 15 2017, 11:01AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Subject to corrections by members with better memory and/or experience ;

4800 Vrms is a little low for a 1 kW sgtc, your spark gap may be prone to power-arcing.

I imagine full-wave rectification and dc-resonant-charging would be more suitable.
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Nik
Thu Mar 16 2017, 02:41AM
Nik Registered Member #53 Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
Could forced air quenching take care of that? I always wondered if a point + pipe spark gap with forced air/suction would work better than the standard vacu-u-gap.
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KeeDx3
Thu Mar 16 2017, 04:08AM
KeeDx3 Registered Member #61435 Joined: Thu Jan 19 2017, 06:46AM
Location:
Posts: 25
I'd like to know too! Mostly because I know absolutely nothing about full-wave rectification and dc-resonant-charging. Way over my head for the time being :/.
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