Author Topic: Is this transformer good for anything  (Read 568 times)

Offline 55#sofcopper

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Is this transformer good for anything
« on: October 17, 2022, 04:38:54 AM »
Hey guys. I'm kinda new to the forum. I've had alot of experience with nsts but I ran across this transformer. 】 100:1 turn ratio. I believe it's a potential trans former. Anyone know if this would be good to drive a 8in tesla coil. Right now I'm using a bank of 12000v nsts equaling up to 300ma. I have four 60ma and two 30ma all in parallel.  I'm wondering what kind of current this is capable of. Is it current limited or will I need an external ballast ? Are these less fragile than nsts ? Or is it useless for a tesla coil ? Thanks for any help.

Offline 55#sofcopper

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Re: Is this transformer good for anything
« Reply #1 on: October 17, 2022, 04:41:52 AM »

Offline 55#sofcopper

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Re: Is this transformer good for anything
« Reply #2 on: October 17, 2022, 04:47:11 AM »

Offline MRMILSTAR

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Re: Is this transformer good for anything
« Reply #3 on: October 17, 2022, 06:01:09 AM »
That is indeed a potential transformer. They can be used to drive a SGTC but you will have to provide a method for limiting the current, typically done with an inductive ballast. Since this one appears to potted in some sort of plastic you have to careful not to overheat it.
Steve White
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Offline Mads Barnkob

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Re: Is this transformer good for anything
« Reply #4 on: October 17, 2022, 06:53:17 AM »
The important rating here is the Thermal rating VA/Capacity thermal at 30 degree Celsius: 1500 VA

So you have to limit the power draw to 1500 VA with current limiting as Steve mentioned.
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Offline 55#sofcopper

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Re: Is this transformer good for anything
« Reply #5 on: October 17, 2022, 04:38:02 PM »
So that's basically 12000v at  125ma. I'm now using a bank of nsts for 12000v at 300ma. So that's less than half the available current that I'm currently using. Are these transformers less fragile than nsts ? Sounds like I would be better off just to keep using the nsts for that coil and use the P.T. for another project. Does that sound about right ?

Offline MRMILSTAR

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Re: Is this transformer good for anything
« Reply #6 on: October 17, 2022, 04:46:54 PM »
If you are getting a reliable 12 KV at 300 ma from your NSTs I would stay with that. NSTs have built-in current limiting whereas PTs do not.
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Offline 55#sofcopper

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Re: Is this transformer good for anything
« Reply #7 on: October 17, 2022, 05:07:05 PM »
Just for information purposes, could it be safely pushed beyond the 125ma with some sort of forced cooling like a strong fan or submersion in oil or even possibly housing it inside a small chest type freezer. I know that's a bit unorthodox  but just a question. I imagine if it's potted it would be difficult to remove heat from the windings given all the insulation. Just a thought exercise.

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Re: Is this transformer good for anything
« Reply #8 on: October 17, 2022, 05:23:05 PM »
One of my 12k 60ma nsts is actually 2  12k 60ma transformers that are Identical. Both have a secondary shorted on 1 side. I have them sanded paint off cases and stacked one on top of the other with the primary ran in parallel and phased correctly to use the good secondary from each one to get the 12kv. With the cases in contact that should share ground potential  and I should be getting the 60ma. Does this sound correct. I never tried that before and it seems to be putting out at least more than 30ma according to the arcs drawn from the two outputs in relation to the arcs drawn from each output to the case. Is this crazy ? I hasn't given me any problems. Oh and what about adding the potential trans to the bank for 425ma. Would this pose a risk to damage the nsts of the P.T. ?

Offline Max

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Re: Is this transformer good for anything
« Reply #9 on: October 19, 2022, 02:00:46 PM »
AFAIK potential transformers are overbuild to stay far away from saturation in normal operation (look at the number of digits in the ratio correction factor; then you know how far away they want to stay from non-linear regions). That means that it can handle quite a bit of abuse. The issue is, as you said, that it's basically a big chunk of iron embedded in insulation material. So you might be able to push it to twice the rated current for a few minutes easily, but then have to wait half an hour or more til the core has cooled down. Note that those values are guesstimations; no personal experience.

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Re: Is this transformer good for anything
« Reply #9 on: October 19, 2022, 02:00:46 PM »

 


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