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Hi I have a problem, when I turn on my vttc, the mot startes to heat up ALOT. In 30 secondes the thing can boil water. Also there are arcs between the secondary and the fillament.(12 turns, stranded, regular plug wire. The metal doesn't get hot. nor the primary, just the secondary. Does anyone know what is wrong?
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Pictures, now.
First off, you should use a variac with MOTs in a VTTC, if you run it 20-30VAC under its input rating, it can almost run for a day only lukewarm to the hand.
Arcs between your secondary and the filament of the tube? Something tells me you are mixing up the different parts here, do you mean from secondary to primary or feedback coil? Nothing else should be close enough to the secondary for a arcover.
Also, for the future, supply us with all the information possible, EVERYTHING!
From your original post its impossible to give any qualified advise other than guessing.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Sounds exactly how N.Tesla 'smoked' Westinghouse's alternator/power plant - high frequency currents in copper coils on steel cores - eddy-currents etc. That's why an rf cap across the bus is recommended above. If that's the problem it is an interesting repetition of TC history, the same unexpected failure with spark gap / thermionic va;ve / semiconductor switches and whatever is next probably.
I would rewind the filament winding since the pvc insulation will be carbonised. apart from it's cost/convenience, most pvc is terrible stuff. Use 'magnet wire' (several strands in parallel if necessary) because more copper fits in the area (lower I2.R heating) and heat transfer is better.
no I found out the problem, the secondary over heated and it arced and then the thing short circuited. I ment that the mot's seconday was arcing to wire I wraped around the core to creat a filament transformer.
All well, there is always the trusty villard cascade. :)
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mot heating up
