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Registered Member #1751
Joined: Fri Oct 10 2008, 03:16PM
Location: India
Posts: 16
Hmmm............I was wondering if we could generate hv from a current transformer. I know that CT's used in power distribution systems produce a current in the secondary proportional to that flowing in the primary. So in a sense they work as constant current sources . It is always said that CT's should not be run on no load, if done so the sec voltage would rise dangerously high and damage the sec windings by arc-over. I dont know how complicated the construction of a CT is but does anyone know how to build one for this purpose ?? THANKS IN ADVANCE
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
Im a manufacturer or CT´s so i can only adrice you not to do this. You are better off using a standard hv transformer, if you want cc, use a current mode switching circuit.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
A CT without burden does indeed produce high voltage on the secondary. However it is only in the form of brief HV spikes as the core rapidly transitions between saturated regions. As you suggested these sharp HV spikes are apt to cause insulation failure.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
I have witnessed multiple kV spikes produced by a 1" diameter hand wound CT on my DRSSTC circuits. It started as a bad connection, and ended with my curiousity getting the better of me. Actually, it finally ended with a shorted winding, but it was pretty cool to see the output jump a mm or so gap!
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
The magnetic / electric stuff in a CT is *capable* of producing very high voltages, but as it's intended to work with a low voltage burden, the secondary will have been *insulated* only to the minimum standard required. As that standard probably includes a 1.5kV flash test, you may well find that any given CT can give several kV before it fails.
You can also use your cell phone as a hammer. As it has to be built to a minimum standard of surviving being dropped, it may drive several small nails in before it fails. But it is not the correct tool for the job.
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High Voltage Using Current Transformer ???
