Low-voltage DC on the windings would do it. It would be tricky to figure a current that would produce enough heat without toasting anything, though. Probably something around the maximum operating current would do it, over time. I would put the primary and secondary windings in series, and heat the whole core. You might try to arrange the connections to approximately cancel the DC flux in the core.
Put the core in a blanket so the heat builds up, and monitor its temperature. My guess is it will take days to build up the heat. You want to heat it up so it is warm to hot to the touch, (maybe 140F / 60C), but you don't want to scorch it. Another thought is to get a few electric space heaters and point them at the unit, and let them heat it up. Again, monitor its temperature. With this kind of heating power, you really need to watch it closely. Bacon, WA3WDR ----- Original Message ----- From: "Don Lemley" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[email protected]> Sent: Sunday, September 18, 2005 12:51 AM Subject: [AMRadio] Drying out HV transformers / Chokes > > Hi all, > > Ok, I know this has been covered here before, > but is there a consensus on how to get the moisture > out of HV plate transformers and chokes, so they > won't arc on me. And before everyone jumps in > with the quick "just put it in an oven on xxx degrees > for yy hours", I am working with the iron from a > Broadcast transmitter, specifically, the Gates > BC-1G so these things are 100, 150 lbs each, > and my XYL would REALLY not like it if I tried > to put them in her fancy oven. They have been > sitting in an un-conditioned but dry hanger/garage > for several years, so I am certain they have soaked > up a good deal of moisture over that time. > > Thanks for any suggestions, > > Don - W8HRQ > > > _________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami >
