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Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
I have 2 of them. Was going to sell on eBay, but decided I may want to keep them if they perform well. I've heard potential transformers are the next best thing to a pole pig. I ballasted one to about 125v@7A. Pulled a couple of very hot arcs!
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I've never had experiences with potential transformers but. If each is 4KV. Then they would work really well in SGTC duty. I would say you would get better sparks than this I would recommend making a variable ballast.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
These transformers are almost indestructible, compared eg. to NSTs, as they are designed to withstand lightning strikes to the transmission lines etc. and all the rubbish that may appear on the HV lines.
PT's are perfect! However, 4kv is very low. You could switch two pieces in series. 8kv would be enough for a tesla coil. You can overload pt's slightly with more voltage...
Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
GreenLab wrote ...
PT's are perfect! However, 4kv is very low. You could switch two pieces in series. 8kv would be enough for a tesla coil. You can overload pt's slightly with more voltage...
Greets, GreenLab
For a static gap, yea its a bit low. My current ARSG coil is only 4400v from dual MOTs, and it performs amazingly well. I get about 5.5ft hot streamers from a 5.25" coil.
Correct me if I'm wrong, but I was under the impression that since this is an instrument transformer, 4000/100v is just the ratio, not its max capability. I should be able to go WELL over 100v without issues.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068
You could use it for a very small mini Tesla Coil using a static gap. These were really popular around 2002-2004 when Gary Laus hosted the mini-Tesla Coil contest on the web where you had to use a 4kV NST limited to about 38mA output current.
Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
EasternVoltageResearch wrote ...
... Other than that, not very useful.
Can you elaborate?
I seem to hear this theory a lot. Supposedly lower voltage, high current transformers don't do well with Tesla coils. However, my own, and other MOT coils out there disprove this. I get excellent and reliable performance from 2.5-4.4kv. I honestly believe its a misconception that continues to get spread around. I understand with a static gap its difficult to get the gap to fire well at these lower voltages, but its still VERY useful with rotary gaps. In fact my dual MOT setup vastly outperformed the 12kv @ 120ma NSTs I tried using before.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
You can get around 16 kV from 2 of them. The thermal rating is 400 VA per transformer, but if you overvolt them like this, from my experience they will easily take 3x the rated VA (unless you run them for half a day), so that might be around 2400 VA from two.
Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
Dr. Dark Current wrote ...
You can get around 16 kV from 2 of them. The thermal rating is 400 VA per transformer, but if you overvolt them like this, from my experience they will easily take 3x the rated VA (unless you run them for half a day), so that might be around 2400 VA from two.
Hmm.. I was hoping for more power than that. My MOTs are about the same.
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Anyone have experience with one of these?
