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Title: Information on Kenyon plate transformer Post by: wb3eii on April 07, 2012, 11:19:46 PM One of my Craigslist finds is a plate transformer.
Made by Kenyon Transformer, It is a "Type S 13342". It has dual primaries, 120-240, and the output is 1400-0-1400. This weighs somewhere around #150, seems to be in good shape. I am currently using it to drive my 4-1000a amp, when I drive it hard, I can hear the transformer sing.(is this an issue)? Does anyone have an old Kenyon catalog? I am curious what the amperage ratings are. 73 AB3HT Title: Re: Information on Kenyon plate transformer Post by: KE6DF on April 07, 2012, 11:43:38 PM I think the S series Kenyon transformers were custom designs for OEM customers.
I have never found anyone with a catalog for them, and doubt one exists. You might go the T series catalog (from the Web) and compare it to one of those of similar size and weight. That should give you an idea of the current rating. Dave Title: Re: Information on Kenyon plate transformer Post by: Opcom on April 08, 2012, 12:15:07 AM Singing my not mean anything. A rule of thumb is to load it until the AC voltage drops to 90% if the unloaded value, that is about the current rating.
What circuit are you using for the rectifier? Title: Re: Information on Kenyon plate transformer Post by: KA2DZT on April 08, 2012, 03:14:28 AM Five digit part numbers are specials. They're not regular catalog models. Just guessing, 2800V CT at 150Lbs, it's probably close to an amp current rating, maybe more.
Fred Title: Re: Information on Kenyon plate transformer Post by: wb3eii on April 08, 2012, 11:55:32 AM "What circuit are you using for the rectifier? "
Full wave ,center tap, capacitor filter. Cap bank is a bit large, 14 cans in a row,(7 on each side of center) 450volt electrolytic, 2400 mf each. Bleeder resistors are 3 units each of 5watt 100k ohm ceramic, parallel connected across each cap.(42 resistors total) 73, AB3HT Title: Re: Information on Kenyon plate transformer Post by: Opcom on April 09, 2012, 03:00:15 AM Do you mean A or B or something else? I am confused by having a cap bank on each side of CT and having a FW CT setup.
anyway, 'talking' may be due to the cap input filter. The peak secondary currents could be large maybe 5A. Title: Re: Information on Kenyon plate transformer Post by: wb3eii on April 09, 2012, 08:10:29 PM Diagram "A" is the setup.
I had worried that the 2400mf caps would be a problem, but I had a few hundred of them, sold most at hamfests over the years, used what I had left. Amp runs fine, no issues in the 2 years I have had it. Most of the time,I can not make the iron sing, as I drive it only to about 1200 watts output. 73, AB3HT Title: Re: Information on Kenyon plate transformer Post by: The Slab Bacon on April 10, 2012, 08:05:00 AM Be wary of running that transformer with a doubler or bridge setup. Running the center tap that high above ground could cause an insulation breakdown failure. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I learned this the hard way and fried a couple of nice plate transformers. :'( :'( Figure "B" is really the prefered way to run those old transformers unless you know that they were specifically rated for FWB use. |