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How do you limit the current on a HV transformer? I will like to be able to adjust the secodary current with out worry what the input current would be. any ideas? I found some articles that the response was "well limit the current on the primary" but how do I limit the current on the primary?
Registered Member #2405
Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
It works for any frequency you just need to substitute the frequency your using. I picked 60hz as an example. Just use the same method I used just substitute the frequency to what ever frequency your using.
Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
If you have a variac, you can rewire it so that the windings are added in series with line voltage, and then you can plug your item right into the socket on the front of the variac. I run all of my neon xformers that way. The trick is getting the wiring right. You can either wire it so that turning the knob up increases the output current (decreasing number of windings in series) or decreases your output current (increasing number of windings).
I hope this makes sense, it's really nice to have a variac around that's wired this way.
Registered Member #2405
Joined: Fri Oct 02 2009, 12:59AM
Location: Wisconsin
Posts: 140
That method does work but for larger currents it be hard on the variac. I did some repair work on a coil that was run with a pole pig and it was connected that way but the brushes on the current limiting variac were all burnt and destroyed. I am sure it had lot of hours on it as it was in a tourist attraction and who knows if the public was able to turn the variacs I didnt see it setup it was in the maintenance shop when I fixed it, the brushes if I remember correctly somewhere around $250 for a set of them. But it worked after I replaced them.
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