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Old 13th April 2013, 03:21 PM   #1
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Default I need help with a transformers issue

i have two transformers just like each other every one of them steps up voltage from 2.3v to about 107v when i connect one of them to an ac source with 2.3v and then take the output which is supposed to be 107v and then connect it to the other one's primary coil I'm supposed to have as a total output about 5kv i think (correct it for me if I'm wrong) but this doesn't happen i get a total voltage lower than 107v , so why does this happen ?! please help
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Old 13th April 2013, 04:28 PM   #2
JMFahey is offline JMFahey  Argentina
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Your impedance matching is ***horrible*** and that's an understatement.
Fine anyway or you'd be toasted crisp by those "5 KV".
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Old 14th April 2013, 12:44 PM   #3
djoffe is offline djoffe  United States
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Each transformer winding has a certain self inductance that limits the current thru the winding. When you try to put 100 volts across a nominal 2 volt winding, the self inductance current is 50x what the designers expected, so the transformer just saturates, and doesn't do much of anything.

If you have a frequency source, you could raise the input frequency. If the transformers don't run out of bandwidth, or insulation breakdown, a higher input frequency might give you better results.

But...be careful...if it does work, that's a potentially deadly amount of volts.
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Old 14th April 2013, 04:41 PM   #4
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Neon sign transformers that are rated to produce 3500 VAC are pretty special. The insulation on the wiring is way thicker than that used in a transformer rated to take 600 V surges. If you need a neon sign transformer (3500 VAC), buy one.
I realize the tesla coil experiment in the Boy Scout handbook didn't mention using special wire, but then that experimental result didn't last very long, either.
If you are making a hi-pot tester, the resistors used in those are about 3" long. A hipot tester limits the short circuit current to < 20 ma outside the grounded box to not kill operators. The techs that repair hipot testers are firm believers in the one hand at a time rule, and not touching the hot side with the power on.
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