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Registered Member #2584
Joined: Tue Dec 29 2009, 01:21PM
Location:
Posts: 6
I am working with some 12KV 30milliamp NST's, and I need to make sure I have the required voltage and amperage for the project I am working on. I can disconnect the center tap so that I can reach the maximum voltage without floating it, but I don't know if I have the required current. I know these things are magnetically shunted so they cannot reach their maximum amperage for more than a fraction of a second, but getting through the tar to remove them would be extremely hard and greatly decrease the time I would be able to run it. I am still working on making a current monitor so that I can read the amperage at high voltages, so it would be greatly appreciated if anyone knows what the average current is that these things run on.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Roughly; 12 kV ac rms open-circuit continuous 30 mA rms short-circuit continuous
The magnetic shunts have the effect of making the secondary 'seem' to have a very large series inductance, in this case XL = 12000/0.03 = 400 kOhm Assuming 60 Hz ac that's 1061 Henries effective.
If you remove the shunts you will easily be able to draw enough current to melt the secondary winding - so I advise you to leave the shunt(s) in place.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
There is curve for operating voltage in NEON SIGNS Miller, S and Fink, D.G. New York (1935) McGraw Hill reprinted by Lindsay Publications ISBN 1-55918-034-x. Also mentioned is operating open circuited is destructive. You might monitor the secondary current by connecting a 7 watt 120 clear Christmas lamp in series with EACH terminal and looking at the glow. Another tool is a KILL-A-WATT meter or one of its type, about $30. usually. Then you could see primary ams, watts and power factor as you loaded it in varios ways. Dont unhhook the centertap and do ground the case to the ground pin of your power plug.
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