Author Topic: Afraid or frying another winding  (Read 785 times)

Offline AndreiRS

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Afraid or frying another winding
« on: February 16, 2018, 11:59:07 PM »
Hi all. I will post the same text I just posted on facebook. I'm still having connection problems...

I built a hv transformer, pole style, no current limiting inside, I use an external ballast. First time I tried to turn it on without a spark gap on the insulators, it just fried the secondary. Now I rebuilt it. But this time it is under oil. Still, I only put insulation paper each 8 layers of 120 turns, or 960 turns. I'm trying to make my Tesla coil work, but the safety gap at the insulators keep firing all time and I have almost no sparks at the rotary gap. I just don't know what to do. If I open the safety gap a little more, I'm afraid it will fry it again. :(

Not sure if the oil will hold things up, since there is no paper between each wire layer, any idea? I know NSTs don't have any paper at all, but this thing can output some 300mA in a short circuit. Would the load from rotary spark gap and capacitors, prevent the internal arcing and destruction?
« Last Edit: February 17, 2018, 12:01:14 AM by AndreiRS »

Offline profdc9

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Re: Afraid or frying another winding
« Reply #1 on: February 17, 2018, 04:02:13 AM »
You need to put a Terry filter between your transformer and the spark gap.   RF spikes are probably feeding back into your transformer and frying it.  I use MOTs and I had to do this to protect my doubling diode.

This is a good reference.

http://www.laushaus.com/tesla/protection.htm

Don't use the Chokes!!  You're better off using just simple RC snubbers and metal-oxide varistors (MOVs), as well as the safety gap.

Dan

Offline AndreiRS

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Re: Afraid or frying another winding
« Reply #2 on: February 17, 2018, 02:56:44 PM »
Hi Dan. Thanks for your reply. I have that filter. I didn't explain it well, sorry. When I fried it, it was not connected to anything. There was no load, so it just created an arc inside.

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Re: Afraid or frying another winding
« Reply #2 on: February 17, 2018, 02:56:44 PM »

 


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