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Registered Member #2416
Joined: Sun Oct 04 2009, 04:23AM
Location: Oceanside, CA
Posts: 91
Sorry if this seems like a trivial question but, can a shorted NST (12kv 60mA) be used as a ballast for a larger transformer? I understand that NSTs have built in current limiting but it should still limit the current to 5 or 6 amps correct? They don't have GFIs. I just want to briefly test an old transformer that I have and I don't want to buy a MOT just for that. Thats all.
Registered Member #1064
Joined: Tue Oct 16 2007, 05:04PM
Location:
Posts: 42
Put an incandescence light bulb in series with transformer primary. Large transformer,high wattage light bulb. Small transformer low wattage light bulb.
Works great, don't even have to use meter to determine if transformer is bad.
If use low wattage light bulb with large transformer, light bulb may glow. Don't be fooled into thinking transformer is bad.
Sorry if this seems like a trivial question but, can a shorted NST (12kv 60mA) be used as a ballast for a larger transformer?
Of course, the primary coil of the NST must be shorted and the sec coil must be used like a ballast inductor (otherwise there would be a HV insolation problem). But the sec coil of the NST has usually a thin wire and, further more, the inductance seen in the sec coil while shortening the prim coil is quiet big. It's so big that the high current of the large transformer cannot be used. The maximal current will be in the order of magnitude as the current for which the NST is rated. Thus there is no big difference if you use the NST as a transformer and leave the big transformer out (assuming that the sec voltage of the NST is roughly the same as the voltage of the big transformer).
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Shorted NST as a ballast?
