Author Topic: First revision  (Read 990 times)

Offline thedoc298

  • High Voltage Experimenter
  • **
  • Posts: 90
  • Karma: +1/-0
    • View Profile
First revision
« on: October 12, 2019, 12:26:44 AM »
https://drive.google.com/open?id=1sL2R1a7om4OT4U0Gt8UwrXXuiRFYxg8b

After some tips, made a change for the better. The cap cage is easy to pop apart and now can watch the caps.  Thanks for the help.
« Last Edit: October 31, 2019, 11:08:09 PM by thedoc298 »

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 213
  • Karma: +4/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: so far video
« Reply #1 on: October 12, 2019, 02:38:43 AM »
It looks like things are progressing nicely. With 7200 volts from your pole transformer you will have to run some tight gap spacing on your RSG, probably no more than about 1 mm per gap but it is doable.

You may regret putting the capacitors inside that tube. Even though they do fit nicely, you can't see what's going on. You can't see if there is excessive corona, flash-over, blown capacitors, etc. I like to be able to observe everything in operation so that I can anticipate problems and to make everything easily serviceable.

Looking forward to see it in operation.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline thedoc298

  • High Voltage Experimenter
  • **
  • Posts: 90
  • Karma: +1/-0
    • View Profile
Re: so far video
« Reply #2 on: October 12, 2019, 02:56:17 AM »
It looks like things are progressing nicely. With 7200 volts from your pole transformer you will have to run some tight gap spacing on your RSG, probably no more than about 1 mm per gap but it is doable.

You may regret putting the capacitors inside that tube. Even though they do fit nicely, you can't see what's going on. You can't see if there is excessive corona, flash-over, blown capacitors, etc. I like to be able to observe everything in operation so that I can anticipate problems and to make everything easily serviceable.

Looking forward to see it in operation.


Well now is the time for making the change, I have been thinking about a different setup for the cap anyway, something will pop up. The spark gap will be close because of the low voltage of 7200 is that correct...? Maybe just ought to junk it.  Got one more question what is you no load current draw on your transformer.

Offline thedoc298

  • High Voltage Experimenter
  • **
  • Posts: 90
  • Karma: +1/-0
    • View Profile
Re: so far video
« Reply #3 on: October 12, 2019, 02:58:19 AM »
It looks like things are progressing nicely. With 7200 volts from your pole transformer you will have to run some tight gap spacing on your RSG, probably no more than about 1 mm per gap but it is doable.

You may regret putting the capacitors inside that tube. Even though they do fit nicely, you can't see what's going on. You can't see if there is excessive corona, flash-over, blown capacitors, etc. I like to be able to observe everything in operation so that I can anticipate problems and to make everything easily serviceable.

Looking forward to see it in operation.


Got a idea to remove the center tub and repace with 4 pvc poles around the cap.

Well now is the time for making the change, I have been thinking about a different setup for the cap anyway, something will pop up. The spark gap will be close because of the low voltage of 7200 is that correct...? Maybe just ought to junk it.  Got one more question what is you no load current draw on your transformer.

The pig going to the back corner of the basment till a later time. Going to start the mod for the center support tomorrow, thanks much for the heads up.
« Last Edit: October 12, 2019, 03:48:07 AM by thedoc298 »

Offline MRMILSTAR

  • High Voltage Engineer
  • ****
  • Posts: 213
  • Karma: +4/-0
  • Cedar Rapids, Iowa
    • View Profile
Re: so far video
« Reply #4 on: October 12, 2019, 05:13:28 AM »
I think that you can make 7.2 KV work, its just that your gap spacing will have to be about 1 mm using 3 KV/mm as a rule of thumb. Remember that 7.2 KV RMS is 10.18 KV peak so your gap spacing is not quite as critical as first appears. Each of my gaps is about 1 mm even though I could get away with more since I am operating with 14.4 KV RMS. Its best to get the gaps as close as you can for the most reliable firing anyway. Some people have made 4 MOTs in series work and that is only about 8 KV RMS. I would try the 7.2 KV pole pig. No harm in trying.  If you find another 7.2 KV pig, you can put them in series.  :D I have seen that done.

One more thing to mention is that a higher voltage transformer is also better because of

E=0.5*C*(V**2)

where the capacitor energy, which also determines spark length, is proportional to the square of the voltage. The more charge you can put on that capacitor, within its safety limits, the better for discharge length.

I've never checked the no-load current on my pole transformer. There is usually a spec on this if you can find it or probably easier just to measure it yourself.

You may want to look at lots of pictures of how others have implemented their coils. It may give you some ideas. I looked at lots of pictures of coils before I built mine.
« Last Edit: October 12, 2019, 04:40:29 PM by MRMILSTAR »
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline thedoc298

  • High Voltage Experimenter
  • **
  • Posts: 90
  • Karma: +1/-0
    • View Profile
Re: so far video
« Reply #5 on: October 12, 2019, 05:28:01 PM »
I think that you can make 7.2 KV work, its just that your gap spacing will have to be about 1 mm using 3 KV/mm as a rule of thumb. Remember that 7.2 KV RMS is 10.18 KV peak so your gap spacing is not quite as critical as first appears. Each of my gaps is about 1 mm even though I could get away with more since I am operating with 14.4 KV RMS. Its best to get the gaps as close as you can for the most reliable firing anyway. Some people have made 4 MOTs in series work and that is only about 8 KV RMS. I would try the 7.2 KV pole pig. No harm in trying.  If you find another 7.2 KV pig, you can put them in series.  :D I have seen that done.

One more thing to mention is that a higher voltage transformer is also better because of

E=0.5*C*(V**2)

where the capacitor energy, which also determines spark length, is proportional to the square of the voltage. The more charge you can put on that capacitor, within its safety limits, the better for discharge length.

I've never checked the no-load current on my pole transformer. There is usually a spec on this if you can find it or probably easier just to measure it yourself.

You may want to look at lots of pictures of how others have implemented their coils. It may give you some ideas. I looked at lots of pictures of coils before I built mine.


Thanks, working on something different today.

Offline davekni

  • High Voltage Senior
  • *****
  • Posts: 557
  • Karma: +31/-0
  • Physicist, engineer (electronic), and hobbiest
    • View Profile
Re: so far video
« Reply #6 on: October 14, 2019, 05:40:27 AM »
I'll second that 7.2kV RMS should be plenty.  My RSG coil uses two MOTs in series with resonant charging, so gets to about 9kV peak, which works well (with close gap spacing).

Did you say 27nF primary capacitance at 32kV?  I have no familiarity with pole-pig transformers.  Is there some resonant-charging effect that will get you much above 10kV?  If not, 27nF will be rather low energy per spark.  For my two-MOT coil, I used 680nF with a 3-turn primary coil to get reasonable energy per spark.
David Knierim

Offline thedoc298

  • High Voltage Experimenter
  • **
  • Posts: 90
  • Karma: +1/-0
    • View Profile
Re: so far video
« Reply #7 on: October 18, 2019, 04:42:52 AM »
I'll second that 7.2kV RMS should be plenty.  My RSG coil uses two MOTs in series with resonant charging, so gets to about 9kV peak, which works well (with close gap spacing).
Thanks, the 27nf is for the 60ma nst. The pig is 7200 rms and for a later build. Glad to know it will work.
Did you say 27nF primary capacitance at 32kV?  I have no familiarity with pole-pig transformers.  Is there some resonant-charging effect that will get you much above 10kV?  If not, 27nF will be rather low energy per spark.  For my two-MOT coil, I used 680nF with a 3-turn primary coil to get reasonable energy per spark.

High Voltage Forum

Re: so far video
« Reply #7 on: October 18, 2019, 04:42:52 AM »

 


* Recent Topics and Posts

post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
davekni
Today at 05:44:51 AM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
plasma
Today at 04:13:43 AM
post Re: Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
September 28, 2020, 11:48:25 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
costas_p
September 28, 2020, 09:56:15 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
futurist
September 28, 2020, 09:52:47 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
davekni
September 28, 2020, 09:50:44 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
costas_p
September 28, 2020, 09:16:53 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
Zipdox
September 28, 2020, 09:09:46 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
costas_p
September 28, 2020, 09:03:23 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
Zipdox
September 28, 2020, 08:50:33 PM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
Zipdox
September 28, 2020, 08:49:09 PM
post Re: Half bridge sstc help with troubleshoot
[Solid State Tesla Coils (SSTC)]
costas_p
September 28, 2020, 08:40:11 PM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
klugesmith
September 28, 2020, 07:36:45 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
September 28, 2020, 07:07:29 PM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
Zipdox
September 28, 2020, 06:41:56 PM
post Re: Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Zipdox
September 28, 2020, 06:28:50 PM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
klugesmith
September 28, 2020, 05:14:51 PM
post Re: Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
September 28, 2020, 04:44:56 PM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
TMaxElectronics
September 28, 2020, 10:50:31 AM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
plasma
September 28, 2020, 09:15:09 AM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
Zipdox
September 28, 2020, 09:09:45 AM
post Re: type of driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
September 28, 2020, 08:39:30 AM
post Re: Stroboscopic photography & motors
[Digital Compact Camera]
klugesmith
September 28, 2020, 08:16:46 AM
post Re: Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Zipdox
September 28, 2020, 01:27:07 AM
post Re: Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
TMaxElectronics
September 28, 2020, 01:14:46 AM
post Re: Rogowski current probe
[Laboratories, Equipment and Tools]
flyglas
September 28, 2020, 12:30:58 AM
post Re: Rogowski current probe
[Laboratories, Equipment and Tools]
Hydron
September 27, 2020, 11:48:35 PM
post Polyphonic Interrupter with STM32F103C8T6 (Bluepill)
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Zipdox
September 27, 2020, 11:43:14 PM
post Re: Rogowski current probe
[Laboratories, Equipment and Tools]
flyglas
September 27, 2020, 11:01:13 PM
post type of driver
[Dual Resonant Solid State Tesla coils (DRSSTC)]
octopus1
September 27, 2020, 10:51:03 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
September 27, 2020, 10:44:43 PM
post Re: MIDI videos from my DRSSTC1/2/3 demonstrations/shows
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
September 27, 2020, 09:44:58 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 27, 2020, 09:20:32 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
futurist
September 27, 2020, 07:49:49 PM
post Stroboscopic photography & motors
[Digital Compact Camera]
klugesmith
September 27, 2020, 07:08:06 PM
post Re: Led Closeups with Mobile phone and lens .
[Smart Phones]
klugesmith
September 27, 2020, 06:43:46 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
September 27, 2020, 06:42:46 PM
post Re: Finding accelerometer location inside a phone
[Smart Phones]
klugesmith
September 27, 2020, 06:36:41 PM
post Re: steam engine
[Capacitor Banks]
plasma
September 27, 2020, 02:32:14 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
September 27, 2020, 02:02:53 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
futurist
September 27, 2020, 12:24:20 PM
post Re: Easy to build Polyphonic MIDI Interrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
Max
September 27, 2020, 12:52:36 AM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
September 26, 2020, 11:06:04 PM
post Re: One NOS ac flyback is nice. Finding its identical twin 3 months later is awesome
[Transformer (Ferrite Core)]
profdc9
September 26, 2020, 10:48:41 PM
post Re: Rogowski current probe
[Laboratories, Equipment and Tools]
Hydron
September 26, 2020, 05:27:37 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Zipdox
September 26, 2020, 04:32:53 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
September 26, 2020, 04:17:51 PM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
GKnapp
September 26, 2020, 02:06:04 PM
post Re: Rogowski current probe
[Laboratories, Equipment and Tools]
flyglas
September 26, 2020, 10:57:58 AM
post Re: DRSSTC Tuning for Music vs Big Sparks?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
September 26, 2020, 08:55:27 AM

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