Author Topic: Van de Graaf is leaking charge  (Read 193 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

Offline ElectroXa

  • High Voltage Enthusiast
  • *
  • Posts: 8
  • Karma: +0/-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.

High Voltage Forum

Re: Van de Graaf is leaking charge
« Reply #2 on: August 14, 2019, 02:56:49 PM »

 


* Recent Topics and Posts

post Re: Mysterious Chinese HV capacitors
[Capacitor banks]
davekni
Today at 03:33:52 AM
post WTS [US]: pole transformer, SRSG, PTs, NSTs, capacitors, variacs, [MORE]
[Sell / Buy / Trade]
acobaugh
October 15, 2019, 09:36:55 PM
post Mysterious Chinese HV capacitors
[Capacitor banks]
MRMILSTAR
October 15, 2019, 09:12:09 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Mads Barnkob
October 15, 2019, 12:38:24 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 10:02:07 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Weston
October 14, 2019, 08:46:54 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 08:28:19 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 07:27:22 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 14, 2019, 07:01:34 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 04:23:56 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
klugesmith
October 14, 2019, 07:27:49 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
T3sl4co1l
October 14, 2019, 07:10:39 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 14, 2019, 05:43:57 AM
post Re: so far video
[Spark gap Tesla coils]
davekni
October 14, 2019, 05:40:27 AM
post Re: Drsstc 4 (new direction)
[Dual Resonant Solid State Tesla coils]
davekni
October 14, 2019, 05:23:48 AM
post Re: Drsstc 4 (new direction)
[Dual Resonant Solid State Tesla coils]
oneKone
October 14, 2019, 04:37:49 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 14, 2019, 03:47:03 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
klugesmith
October 13, 2019, 11:05:25 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 13, 2019, 09:29:25 PM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 13, 2019, 04:43:47 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
davekni
October 13, 2019, 07:04:20 AM
post Re: How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
davekni
October 13, 2019, 07:00:57 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 13, 2019, 06:36:13 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Weston
October 13, 2019, 12:41:07 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Hydron
October 13, 2019, 12:17:39 AM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
October 12, 2019, 11:21:39 PM
post How to measure voltage output of AC flyback transformer
[Transformer (ferrite core)]
MRMILSTAR
October 12, 2019, 08:37:36 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 12, 2019, 06:57:55 PM
post Re: so far video
[Spark gap Tesla coils]
thedoc298
October 12, 2019, 05:28:01 PM
post Re: 220ac to 440dc 5a boost convertor
[Voltage Multipliers]
rustedone
October 12, 2019, 04:58:28 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
October 12, 2019, 03:53:12 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
October 12, 2019, 02:12:59 PM
post Re: 220ac to 440dc 5a boost convertor
[Voltage Multipliers]
rustedone
October 12, 2019, 10:43:48 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
ScottE
October 12, 2019, 07:38:47 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
davekni
October 12, 2019, 06:16:12 AM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
davekni
October 12, 2019, 05:52:51 AM
post Re: so far video
[Spark gap Tesla coils]
MRMILSTAR
October 12, 2019, 05:13:28 AM
post Re: Problems with my first DRSSTC
[Dual Resonant Solid State Tesla coils]
davekni
October 12, 2019, 04:41:19 AM
post Re: so far video
[Spark gap Tesla coils]
thedoc298
October 12, 2019, 02:58:19 AM
post Re: so far video
[Spark gap Tesla coils]
thedoc298
October 12, 2019, 02:56:17 AM
post Re: so far video
[Spark gap Tesla coils]
MRMILSTAR
October 12, 2019, 02:38:43 AM
post so far video
[Spark gap Tesla coils]
thedoc298
October 12, 2019, 12:26:44 AM
post Re: Help for people buying the "12-48 Volt 1800/2500 Watt ZVS induction Heater"
[Electronic circuits]
T3sl4co1l
October 11, 2019, 11:33:19 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Netzpfuscher
October 11, 2019, 11:17:17 PM
post Re: DRSSTC with litz-wire primary and 40 x TO247 IGBT H-Bridge
[Dual Resonant Solid State Tesla coils]
Hydron
October 11, 2019, 10:06:32 PM
post Re: My first DRSSTC on bricks
[Dual Resonant Solid State Tesla coils]
Laci
October 11, 2019, 09:03:38 PM
post Re: 220ac to 440dc 5a boost convertor
[Voltage Multipliers]
rustedone
October 11, 2019, 07:32:57 PM
post Re: 220ac to 440dc 5a boost convertor
[Voltage Multipliers]
rustedone
October 11, 2019, 07:22:56 PM
post Re: My terry filter
[Spark gap Tesla coils]
thedoc298
October 11, 2019, 06:54:59 PM
post Re: Problems with my first DRSSTC
[Dual Resonant Solid State Tesla coils]
bozidar
October 11, 2019, 11:34:59 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