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Registered Member #3026
Joined: Fri Jul 23 2010, 02:46PM
Location: Los Angeles, California, U.S.A.
Posts: 54
Hello everyone,
I have found an electronic surplus store near me with a supply of used N.S.T.s for $20 each. However, they all say 220 volt input and 15K output! Can I run one of these on my house 110 volts and expect to get 7500 volts output?
Registered Member #3353
Joined: Sat Oct 23 2010, 11:21PM
Location: Greece
Posts: 90
Hi Radioman
If they are rated for 15KV (secondaries are insulated for that kind of voltage) you can get 2 of them with primaries in parallel and secondaries in series to get 15KV (assuming 110V input)! Just make sure the phases are right. I think 110V input will work just fine, after all it is the same as feeding 55V to your 110V NST using a Variac! Good luck!
If all else fails, perhaps you could get a Variac with 110V in and up to 250V out?
EDIT : Just remembered, most of these NSTs have dual secondaries, in this case you cannot put the secondaries is reries because each of them is connected to ground . Only if the output is 0-15KV (and not 7,5 - 0 - 7,5) you can do the series trick... BTW i have done this , using two 0-24V transformers to make a 24-0-24 one.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Actually, you're best bet is to run them from 220VAC. You didn't mention the output current, but 15kV NSTs are excellent, especially if they are the older style. Buy 2, Buy 4, run them all in parallel. Just make sure the phasing is correct. Terry Fritz has some articles on how to check phasing on
Remember, if you have 110VAC in your house, you also have 220VAC (more than likely)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
If you use half the voltage, the VA output will drop 4 times. You can also get 220V from 110V by using a 110/110 isolation transformer conencted as an autotransformer.
Registered Member #3353
Joined: Sat Oct 23 2010, 11:21PM
Location: Greece
Posts: 90
EastVoltResearch :
"Remember, if you have 110VAC in your house, you also have 220VAC (more than likely)"
EastVoltResearch, could you elaborate on that? I would love to know how to do that. I am not familiar with the US electrical grid or the house electrical wiring, but if you have one phase 110V 60Hz AC how can you get 220V AC? I mean without a doubler , transformer, inverter and such, that is what you mean right? Thanks
Registered Member #3353
Joined: Sat Oct 23 2010, 11:21PM
Location: Greece
Posts: 90
Thanks Grenadier,
I did not know that! Very practical design, you can have 110V or 220V. Only thing, you must have a line (different from the usual 110V) in every place you need to run a 220V device.
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220 volt N.S.T.
. Only if the output is 0-15KV (and not 7,5 - 0 - 7,5) you can do the series trick... BTW i have done this , using two 0-24V transformers to make a 24-0-24 one.
i think there like 25-30$
