1st timer with Tesla Coils (coil kicks ass) / Projects / Forums

Forums

4hv.org :: Forums :: Projects

« Previous topic | Next topic »

1st timer with Tesla Coils (coil kicks ass)

first previous 3 4 5 6 next

Move Thread

LAN_403

Myke

Tue Sept 18 2007, 02:14AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

Looks very nice. I really like the MOT stack.

Kizmo

Tue Sept 18 2007, 05:13PM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

ARGH

So much for nothing. I have build this for hours and then i got 15 minutes of 16kV @ 5000W pure HV power, then i smelled that lovely burning transformer/oil smell and reason for that was the most predictable in my building history. Well, i got insulation failure in 6th stage, not 8th :)

But results before failure were so impressive that i just have to try again with few extra tricks in my mind ;) I need to drain oil, remove defective MOT and cut it open to see what caused failure. Will post pics later.

16kV and slightly over 5000W of power

.. and then failure

Experimentonomen

Tue Sept 18 2007, 05:17PM

Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497

Man thats messy business :(

Kizmo

Tue Sept 18 2007, 05:41PM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

HFsstc-freak wrote ...

Man thats messy business :(

True :D

But sometimes you just have to get down and oily to get results :)

Kizmo

Wed Sept 19 2007, 05:11PM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

Oil is drained out, no visible damage or burns in transformer that failed yesterday. I replace only one which failed, others will remain.

Replacement MOT will be modified:

- HV winding is disconnected from core permanently
- Filament winding is removed permanently
- All paper based insulation are removed and replaced with plastic

I will make new insulation out of overhead projector sheets. After removing all old paper and glue there is space for about 4 to 6 layers. Both HV and LV windings will be insulated same way.

Pics:

HV winding was pretty hard to get out in one piece - but it came with some hydraulic brutality ;)

And done

Tomorrow i will buy some varnish (same stuff that i used to my TC secondary) ans put that MOT back together.

Kizmo

Sat Sept 22 2007, 07:44PM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

Well, i don't know what to say... thing is that this coil is dead - no more sparks with that secondary.

Statement of death

Born: Aug 8 2007
Passed: Sep 22 2007

Rest In Peace my little coil

----

So what happened? I added one extra stage to my MOT Stack to get 6-pack (12kV @ plenty of power) Spark intensity increased amazingly and i got what i was looking for, 200cm discharge :)

I was just taking pictures about sparks and streamers until my brother shouted that secondary is on fire and turned mains off (we ran it about 20min before failure). I couldn't see that failure myself behind the camera.

We get took stuff inside and i did quick autopsy to find out what really happened. There was two shored turns in beginning of secondary and copper wire was melted and broken! There was also some sings of arcing between pipe and winding, under varnish.

There are few reasons for this: (i think)
- I got few primary-secondary arcs because of wrong coupling when we first tested this coil in august, there was small holes in varnish but i repaired those with sanding and epoxy. (and now there is bad burn again BUT not because of secondary-primary arcing)
- Too much power for rather small coil

Pics:

Streamers

And failure

Life is life, now i have good reason to make taller secondary and maybe SSTC... who knows

Hazmatt_(The Underdog)

Sat Sept 22 2007, 10:16PM

Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735

OR

Get a new secondary form, wind with ~1100T and H/D 4-4.25

You were just pushing way too much power into the thinner wire is all, so get some beefier wire like 24 AWG or something.

Kizmo

Sun Sept 23 2007, 12:38AM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

That thicker wire was in my mind since i wound this coil.

I think i rebuild this from the scratch - Tesla1's journey ends here.

I made small video about this coil:

Kizmo

Wed Oct 03 2007, 07:07AM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

Now its finally time for RSG but, which one you would go for:

Option 1:

fixed 1300rpm synchronous 130/260BPS RSG (i found new 1300rpm sync. motor)

OR

Adjustable 0-6000rpm asynchronous 0-400BPS RSG (that centrifuge)

Dago

Wed Oct 03 2007, 08:09AM

Registered Member #538 Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181

Synchronous definately, as it will use the power most efficiently and the streamers are alot cooler and "meaner"

first previous 3 4 5 6 next

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob