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Registered Member #809
Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114
sorry, i know i'm not allowed to double post but i forgot to attach this video of my "sparks" with my other post. This is the two high voltage terminals of the transformer, the arcs are about 2mm long and humm alot. Compare this to the video i posted above and you can see the problem, they don't stretch, nor are they big and mine is only 30ma less than that one. The secondaries are centre grounded to the case. i tried each terminal to the case and the sparks are tiny. there has to be something serious going on in there. ]1182060858_809_FT26954_arc_1.wmv[/file]
Registered Member #530
Joined: Sat Feb 17 2007, 07:56AM
Location: Victoria BC, Canada
Posts: 178
Have you measured the resistance of the primary and secondary with a multimeter yet? Higher resistance in ohms will indicate the secondary windings... uneven resistance on the coils could indicate a short... How sure are you that these NSTs don't have power correction units built in them? They look totally shorted - and you'd have to REALLY abuse these transformers to burn them up... so I'm guessing there is something more going on here than just a bad transformer. Wiring...
Another scenario - not so pretty- it is very possible that these NSTs were discarded after the tar melted on them due to long use and the secondary insulation broke down - forming an arc path and shorting out the coils. That might explain your problem. I'd un-pot your NST in an oven and pour out the tar. The rest of the coil could soak in Gasoline or Diesel.... then you can see the coil better and access the core.
-----another thought------ Did some diggin' on NeoLite products: These NSTs are mostly power factor corrected - they use a capacitor inside with an internal safety. If the capacitor went on them they could dead short --- just an idea. Might explain a few things.... your going to need to get into the transformerand do some moddin'
Registered Member #809
Joined: Wed May 30 2007, 08:59AM
Location: Melbourne, victoria
Posts: 114
where would the power correction circuits be, in the tar? because there is nothing else outside of the case with the tar and windings in it. Is there any optimum resistance for the secondary, so i can see if it's shorting, would shorted windings cause smaller arcs. What i don't understand is why they just stop working, when i first tested the new one, it worked fine for about 20 seconds then the output just stopped, so i unplugged it and put the wires closer together, still nothing but a bit of humming. So then i touched the two terminal wires together and all i got wass little sparks about 1mm long when they contacted? What the hell is going on here????? EDIT: the tar is a bit cracked and fragile, but it worked for a sec when i first plugged it in so i don't think the insulation it melted. And your saying there could be a cap inside the transformer shorting it out? UPDATE: i am just about to stick the nst in the oven and hopfully melt the tar and not he windings, what temperature should it be?, will this melt the winding insulation?
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Wiring a nst