Author Topic: Afraid or frying another winding  (Read 1163 times)

Offline AndreiRS

  • High Voltage Experimenter
  • **
  • Posts: 73
  • Karma: +0/-0
    • View Profile
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

  • High Voltage Engineer
  • ****
  • Posts: 234
  • Karma: +11/-0
    • View Profile
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

  • High Voltage Experimenter
  • **
  • Posts: 73
  • Karma: +0/-0
    • View Profile
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.

Offline MRMILSTAR

  • High Voltage Technician
  • ***
  • Posts: 154
  • Karma: +4/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: Afraid or frying another winding
« Reply #3 on: October 05, 2019, 11:21:34 PM »
If you're going to make your own HV transformer, there are a couple of things that must be done to avoid failure. You need Kraft paper between the winding layers on the secondary coil. This is to provide some spacing between the layers. You also need to immerse the transformer in oil. You then need to pull a partial vacuum on the transformer container to remove the trapped air bubbles within the secondary windings. The Kraft paper provides spacing for the oil. The paper itself provides only negligible insulation. If you don't remove the trapped air bubbles, it will fail.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline shrad

  • High Voltage Enthusiast
  • *
  • Posts: 41
  • Karma: +0/-0
    • View Profile
Re: Afraid or frying another winding
« Reply #4 on: October 08, 2019, 08:53:18 AM »
Kapton has also some advantages there, in that you can order a roll of the width you want, and will insulate well enough for interlayer

High Voltage Forum

Re: Afraid or frying another winding
« Reply #4 on: October 08, 2019, 08:53:18 AM »

 


* Recent Topics and Posts

post Re: DIY 250W LED Flood Light for High Speed Filming
[Light, Lasers and Optics]
Mads Barnkob
Today at 09:04:34 PM
post HP T620 thin to plus conversion....
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
spacecabbie
Today at 02:03:15 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
Today at 05:43:17 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
klugesmith
Today at 04:07:51 AM
post Finding accelerometer location inside a phone
[Smart Phones]
haversin
February 22, 2020, 07:23:28 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
dj.cosmo.esq
February 22, 2020, 07:41:18 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
February 22, 2020, 06:49:22 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
February 22, 2020, 03:39:10 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
Quentief
February 22, 2020, 02:32:55 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
klugesmith
February 22, 2020, 02:10:34 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
Quentief
February 22, 2020, 01:27:41 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
February 21, 2020, 08:00:10 PM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
February 21, 2020, 02:44:44 PM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
klugesmith
February 21, 2020, 07:21:13 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
February 21, 2020, 06:11:32 AM
post Re: GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
February 21, 2020, 04:42:34 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
davekni
February 21, 2020, 04:37:53 AM
post Re: UV-cured cyanoacrylate glues?
[Light, Lasers and Optics]
Twospoons
February 21, 2020, 04:28:33 AM
post Re: UV-cured cyanoacrylate glues?
[Light, Lasers and Optics]
klugesmith
February 21, 2020, 04:21:31 AM
post GDT keeps on killing IGBTs
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
February 21, 2020, 02:41:03 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
Quentief
February 21, 2020, 12:28:20 AM
post Re: UV-cured cyanoacrylate glues?
[Light, Lasers and Optics]
Twospoons
February 20, 2020, 09:45:21 PM
post Re: UV-cured cyanoacrylate glues?
[Light, Lasers and Optics]
klugesmith
February 20, 2020, 07:28:01 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Uspring
February 20, 2020, 02:06:26 PM
post Re: UV-cured cyanoacrylate glues?
[Light, Lasers and Optics]
shrad
February 20, 2020, 10:38:01 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
davekni
February 20, 2020, 05:14:43 AM
post Re: Is this flyback OK for my Plasma ball ?
[Transformer (Ferrite Core)]
davekni
February 20, 2020, 05:04:50 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
klugesmith
February 20, 2020, 04:47:41 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 19, 2020, 07:29:23 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 19, 2020, 06:47:55 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 19, 2020, 06:45:23 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Teravolt
February 19, 2020, 06:41:42 PM
post Re: Is this flyback OK for my Plasma ball ?
[Transformer (Ferrite Core)]
John123
February 19, 2020, 06:10:34 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
MRMILSTAR
February 19, 2020, 05:52:20 PM
post Re: Is this flyback OK for my Plasma ball ?
[Transformer (Ferrite Core)]
ElectroXa
February 19, 2020, 05:05:50 PM
post Re: Is this flyback OK for my Plasma ball ?
[Transformer (Ferrite Core)]
John123
February 19, 2020, 04:11:22 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Uspring
February 19, 2020, 02:03:12 PM
post Is this flyback OK for my Plasma ball ?
[Transformer (Ferrite Core)]
warmania
February 19, 2020, 11:24:58 AM
post Re: HP T620 Thin Client - PSU Hack And Windows PC Modification
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
latethannever
February 19, 2020, 11:00:15 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
rikkitikkitavi
February 19, 2020, 10:43:13 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 19, 2020, 06:54:14 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
klugesmith
February 19, 2020, 06:51:52 AM
post Re: 230 volts spark gap
[Spark Gap Tesla Coils (SGTC)]
davekni
February 19, 2020, 03:53:13 AM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
ElectroXa
February 18, 2020, 09:44:25 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
MRMILSTAR
February 18, 2020, 09:34:06 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 18, 2020, 08:27:31 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Weston
February 18, 2020, 07:55:14 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
Peregrine
February 18, 2020, 07:32:04 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
klugesmith
February 18, 2020, 05:58:39 PM
post Re: Help!Capacitor that burns out after a while!
[Voltage Multipliers]
MRMILSTAR
February 18, 2020, 05:16:55 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal