Author Topic: Van de Graaf is leaking charge  (Read 614 times)

Offline Patric

  • High Voltage Enthusiast
  • *
  • Posts: 7
  • Karma: +0/-0
    • View Profile
Van de Graaf is leaking charge
« on: August 14, 2019, 09:22:21 AM »
Dear all,
my Van de Graaf had been working flawlessly. I was able to pull 40cm coronal discharges from it.
Here is a long exposure:



The column is made from 160mm diameter PVC pipe.



After half a year of non operation I brought it back to life and I now have some severe problems. When it starts up it nicely charges the top load as usual, but after about 30 secs there is charge leaking from the column. In the dark you can clearly see several jets coming out of the side of the column. The origins of the jets seem to be arranged along a line parallel to the column. I cannot take pictures but here is a sketch:



I already checked in the outside and inside of the column for any contamination or damages. Nothing, all looks smooth. Really scratching my head about this.
The column is a sandwich from PVC and foam. Looks like this:



If anyone has got some ideas, let me know!

Cheers Patric

Online ElectroXa

  • High Voltage Enthusiast
  • *
  • Posts: 24
  • Karma: +1/-0
    • View Profile
Re: Van de Graaf is leaking charge
« Reply #1 on: August 14, 2019, 01:42:21 PM »
Was the Van de graaf stored in a moist place?
Because the foam can retain moisture, so it becomes conductive and thus cause current leaks.

Offline Patric

  • High Voltage Enthusiast
  • *
  • Posts: 7
  • Karma: +0/-0
    • View Profile
Re: Van de Graaf is leaking charge
« Reply #2 on: August 14, 2019, 02:56:49 PM »
Was the Van de graaf stored in a moist place?
Because the foam can retain moisture, so it becomes conductive and thus cause current leaks.

No not really, always sat in the workshop which is not humid. (ok, the laundry room is next door...  ???)
I will take it apart and try to dry it, maybe run the hair dryer for some time.

My next VDG is planned to feature a transparent acrylic column. Those shouldnt be prone to take on moisture.

Offline nik282000

  • High Voltage Enthusiast
  • *
  • Posts: 1
  • Karma: +0/-0
    • View Profile
Re: Van de Graaf is leaking charge
« Reply #3 on: October 22, 2019, 04:56:19 PM »
I have had good luck using only a hair dryer to get my leaky VDG running.
After A year or two in the basement it tends to work very poorly if I don't blow it down, both inside and out with a hair dryer for about 10 minutes. It seems to remove any accumulated surface moisture and lets it run even on humid days.

Hope that helps.

High Voltage Forum

Re: Van de Graaf is leaking charge
« Reply #3 on: October 22, 2019, 04:56:19 PM »

 


* Recent Topics and Posts

post Re: Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Weston
Today at 12:54:06 AM
post Linear Guide and Ball Screw
[General Chat]
Patrick
June 04, 2020, 08:14:58 AM
post Re: Reverse engineering a big old American smoke detector
[Radioactive Sources]
klugesmith
June 04, 2020, 06:30:09 AM
post Re: Datasheet Question
[Electronic Circuits]
Mads Barnkob
June 03, 2020, 08:01:53 PM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
June 03, 2020, 03:04:11 PM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
June 03, 2020, 02:54:04 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Max
June 03, 2020, 02:27:26 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Hydron
June 03, 2020, 02:19:32 PM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
Mads Barnkob
June 03, 2020, 02:10:57 PM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic Circuits]
arctichominid
June 03, 2020, 02:10:18 PM
post Re: New projet OmegaDR
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mugi30
June 03, 2020, 12:27:06 PM
post Datasheet Question
[Electronic Circuits]
ritaismyconscience
June 03, 2020, 08:10:27 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
June 03, 2020, 07:57:48 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
June 03, 2020, 07:01:44 AM
post Re: Site Info desperately needed: http://www.stevehv.4hv.org/
[General Chat]
John123
June 03, 2020, 01:01:25 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
ritaismyconscience
June 03, 2020, 12:50:28 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
June 03, 2020, 12:35:11 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
09d08
June 03, 2020, 12:22:31 AM
post Re: Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
johnf
June 02, 2020, 09:25:51 PM
post Proper Grounding in an Apartment
[Solid State Tesla Coils (SSTC)]
09d08
June 02, 2020, 03:58:49 PM
post Re: 180kV ( 20cm ) Cockroft-Walton - ZVS Driver - RF Remote Control
[Voltage Multipliers]
davekni
June 02, 2020, 06:50:52 AM
post 180kV ( 20cm ) Cockroft-Walton - ZVS Driver - RF Remote Control
[Voltage Multipliers]
TheMaxii2007
June 02, 2020, 05:52:14 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
davekni
June 02, 2020, 04:53:24 AM
post Re: Reverse engineering a big old American smoke detector
[Radioactive Sources]
TheMaxii2007
June 02, 2020, 04:19:02 AM
post Re: Neon transformer
[Transformer (Iron Core)]
MRMILSTAR
June 01, 2020, 11:55:28 PM
post Re: Neon transformer
[Transformer (Iron Core)]
Mads Barnkob
June 01, 2020, 08:34:10 PM
post Re: Neon transformer
[Transformer (Iron Core)]
ritaismyconscience
June 01, 2020, 07:58:20 PM
post smallest iron core high voltage transformer ?
[Transformer (Iron Core)]
ElectroXa
June 01, 2020, 05:50:47 PM
post Re: Portable Q(uarantine)CW Tesla Coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Uspring
June 01, 2020, 05:27:08 PM
post Neon transformer
[Transformer (Iron Core)]
Iyacht
June 01, 2020, 10:02:58 AM
post Re: Mazilli ZVS Driver Modification Problems
[Transformer (Ferrite Core)]
Andrew321
June 01, 2020, 03:38:05 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
June 01, 2020, 03:07:36 AM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
May 31, 2020, 11:59:47 PM
post Re: Servomex CO2 analyser
[Electronic Circuits]
erlendse
May 31, 2020, 11:05:19 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 11:03:45 PM
post Re: Please help me find a replacement (choke?)
[Beginners]
boxermick
May 31, 2020, 09:25:36 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
ritaismyconscience
May 31, 2020, 09:25:26 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 09:19:32 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
ritaismyconscience
May 31, 2020, 09:12:09 PM
post Re: CT performance investigations (Pearson and DIY)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Hydron
May 31, 2020, 09:10:39 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 09:00:46 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
ritaismyconscience
May 31, 2020, 08:57:42 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 08:50:17 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
ritaismyconscience
May 31, 2020, 08:40:02 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 08:32:03 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
ritaismyconscience
May 31, 2020, 08:20:07 PM
post Re: Building a bigger DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ritaismyconscience
May 31, 2020, 08:13:21 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 07:45:04 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
nix85
May 31, 2020, 07:42:19 PM
post Re: Russian voltage multiplicator stacking
[Voltage Multipliers]
davekni
May 31, 2020, 07:32:32 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