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High Voltage Transformer
Posted by Phil Makotyn on 9/26/2003, 4:25 pm I have a quick question. I am trying to fix a partical accelerator that is at my college. Our previous transformer was a old WWII medical transformer, but it failed ealier this year. We have one back up that may work, but I don't understand the outputs or the inputs. Its a 220VAC in to 165 kVAC out. There are 6 inputs in 2 rows labled Y, T2, and, X on top and M, T1, and, R on the bottom row, each from left to right. There are 4 output towers that are unlabled. I was wondered if anyone knew what the inputs are and why there are 4 outputs. Thanks
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Re: High Voltage Transformer
Posted by Wes Martin on 3/17/2007, 6:09 pm, in reply to "High Voltage Transformer"
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Re: High Voltage Transformer
Posted by Bert Hickman on 3/17/2007, 6:52 pm, in reply to "Re: High Voltage Transformer" Hello Wes, Are you looking only for the HV transformer or would a version that had an internal rectifier also be OK? Also, where are you located? Once I have the above informaino I can forward your request to some folks who might have what you need. Bert
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Re: High Voltage Transformer
Posted by Wes Martin on 3/26/2007, 10:43 pm, in reply to "Re: High Voltage Transformer"
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Re: High Voltage Transformer
Posted by Bert Hickman on 3/26/2007, 11:56 pm, in reply to "Re: High Voltage Transformer" Hi Wes, Unlike most transformers (that are rated in RMS volts), X-ray transformers are rated for peak volts at a given current load. This is because the peak voltage rating reflects the maximum energy of the x-rays that can be created (which, in turn, determines penetrating power of the resulting x-rays). The peak output voltage is independent of whether the output is rectified or filtered (unless a voltage doubling circuit is used). Rectification (with no capacitive filtering) will improve the duty cycle and thus the total x-ray power available. Adding a filter capacitor will reduce the "spread" between maximum and minimum x-ray energies, but again will not increase peak voltage. The distance an arc will jump is really not a very good measure of voltage, since the distance you can stretch an arc is strongly dependent on the amount of available current. Heck, you can even stretch a high current low voltage welding arc for an inch or two. The distance that a spark will initially jump between identical spheres is a considerably more accurate way to roughly measure peak output voltage. Here's a table that you may find useful: Good luck and please remember to PLAY SAFELY - X-ray transformers can be VERY nasty! Bert
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Re: High Voltage Transformer
Posted by Wes Martin on 3/27/2007, 8:20 pm, in reply to "Re: High Voltage Transformer" Thanks for the information, Bert! These are serious transformers, and I want to do what I can to ensure I am knowledgeable about them (so as not to ruin them, or myself)! Cheers, -Wes.
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Re: High Voltage Transformer
Posted by Wes Martin on 3/17/2007, 9:27 pm, in reply to "Re: High Voltage Transformer"
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Re: High Voltage Transformer
Posted by Wes Martin on 3/17/2007, 9:19 pm, in reply to "Re: High Voltage Transformer" : Hello Wes,
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Re: High Voltage Transformer
Posted by Bert Hickman on 9/27/2003, 8:16 am, in reply to "High Voltage Transformer" Hi Phil, Unfortunately, I have no information on this transformer. You may be able to contact the emanufacturer for additional information (assuming they are still in business). Anothe option would be to contact a local medical equipment and x-ray equipment service firm in your area. The transformer sounds like it might be an x-ray transformer with floating HV filament outputs, but I really can't be sure from the description. Good luck and best regards, -- Bert --
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