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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Hey guys, give me a break. I was holding an insulated rod. The 3kv is floating with this amazing epoxy secondary. I was staying well away from any thing grounded. There would have been minimal coupling to earth anyway. Ballasting has nothing to do with safety. I was aware of all these things at the time. It's voltage is little different from a ballasted MOT with the difference that a MOT is grounded making it much more dangerous to touch one wire. Compared to adjusting a Nitrogen laser this pic is very safe.
Please remain on topic.
Steve Conner wrote ...
Transformers store hardly any magnetic energy, because the core doesn't have an airgap. I doubt it stores anywhere near 200J. If it did, it would draw 10kVA worth of magnetizing current when connected to the supply but unloaded.
That's not how I understand it. When you turn on a perfect inductor you initially draw power to build the magnetic field. This effect is the thump that sometimes happens when you switch on a variac and is greatest at zero crossing (rather than switching on at peak voltage). After that net power is zero. In my transformer setup the current is far less than 10kVA when it is running at no load but energy had to be expended initially to build the field at turn on and this takes a few cycles until the voltage/current phase relationship settles. 10KVA (200J per 50Hz cycle) of power is what can be extracted from that field at close to maximum capacity. I would guess that it is a bit more as the 10KVA is the thermal limit as efficiency drops after that with increasing iron saturation losses.
The pic below shows the much brighter and very much louder exploding wire at the same energy without the inductor in the circuit.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
I'm fascinated by your first picture, TDU... I'm trying to work out why the colour of the flash around your inductor isn't the same as the wire vaporisation flash.
What kind of shrapnel is left behind (if any) after a shot such as this?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I am not sure about the different colour. As the plasma seems to extend around the transformer apparently in close proximity, it may mobilise some dust or sweat off the surface
I haven't seen any fragments, but 35G is very fine wire and 2.5kJ can let out a lot of smoke. My previous efforts with fine wire resulted in fragmentation and string of pearls appearance.
Registered Member #121
Joined: Fri Feb 10 2006, 12:39PM
Location: Bromley, UK
Posts: 10
Would it be possible to take a picture through a welding mask (or equivilent) to show more detail of the plasma? Or could this be done by reducing the exposure? It would be interesting to see what was going on around the inductor/transformer Great pics nonetheless Richy.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
I have taken photos of sparks through welding goggle filter(s) before in the pic below. I could try this again. My camera has a lot of settings and is still using smarts like auto ISO which allows me to take 3 second exposures before the sun has set without overexposing. It will take some experimentation and fiddling with manual settings, I guess. A heavily neutral filtered shot would be interesting to look at wire disintegration more closely.
Registered Member #288
Joined: Mon Mar 06 2006, 07:52AM
Location: Palmerston North
Posts: 32
Woah that is crazy you should get a video of the tesla. How do you switch it?
I just fired 182J of energy into a piece of solder and thought that was cool with all these little glowing balls of solder propelling themselves along the table. They hit small piles of black powder that happened to be spilt and made a woosh woosh sound.
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