Electronics > Beginners
Is my 15KV neon light transformer broken ?
BravoV:
--- Quote from: Psi on March 21, 2019, 09:45:14 am ---The usual failure mode for a NST is one of the two output sides going short.
So you get an arc from one side to case but not the other side to case.
--- End quote ---
Ok, noted.
Also, the case connection from middle tap, its just for ground connection came from the mains ground line, am I right ?
BravoV:
--- Quote from: Zero999 on March 21, 2019, 10:33:37 am ---The primary's inductance should be much higher than that. The magnetising current will be tiny, compared to when it's loaded.
The problems is the inductance of the transformer will be frequency dependant and meters often test at a much higher frequency, than the mains.
I think the transformer is most likely fine. As mentioned above, connect it to a spark gap, turn on the power and keep well back. Note that 15kV at 30mA, is a high enough voltage and current to be lethal!
--- End quote ---
I guess I will have to try it myself, will be using variac, and still waiting for engine spark plug cable to arrive.
Psi:
--- Quote from: BravoV on March 22, 2019, 02:29:31 am ---
--- Quote from: Psi on March 21, 2019, 09:45:14 am ---The usual failure mode for a NST is one of the two output sides going short.
So you get an arc from one side to case but not the other side to case.
--- End quote ---
Ok, noted.
Also, the case connection from middle tap, its just for ground connection came from the mains ground line, am I right ?
--- End quote ---
Correct, HV center tap is mains earth.
The manufactures are cheap, or maybe smart, and get around some rules for insulation/isolation of high voltages by making +/- 6kV outputs instead of one 12kv output.
A single 12kV output would require more insulation and be more expensive to make.
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