[Amps] Need Japan Radio Plate Transformer Info

[Will Matney]

Ron,

It's according to what flux density they designed it to run at, and what type of iron the core is. When you raise the primary voltage, the flux density will raise if using the same core. If they designed it to run at a pretty low flux desity, and the material will handle a higher one, you may be ok. By running at a higher flux density, the magnetizing current will be greater which means the transformer will draw more line current without a load. This also means the losses will go up, and the transformer will run hotter. It may be ok doing this if the wire can stand the extra heat. As long as it doesn't saturate, and the wire will handle it, it may be ok. If there's any way to add a fan around it, that would be a good move.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 9/1/06 at 2:24 AM w2cqm at juno.com wrote:

>I have, what is in reality, a Japan Radio amplifier disguised as a 
>piece of medical equipment with a pair of 3-500's. A perfect candidate 
>for a retrofit!  The plate transformer is stenciled for 200VAC input 
>with an output voltage of 2400VAC. I put 240VAC on the inputs and the 
>voltage increased to about 2800VAC (no load) with no indication 
>(vibration, noise, heat, etc)  that there was a problem with the over-
>voltage. Based on that observation, my feeling is that it's wound for 
>240VAC and the manufacturer simply used it on 200VAC since that's the 
>normal voltage (100/200vac)  in Japan.  Does anyone have any 
>experience using Japan Radio transformers on higher input voltages? If 
>that's the case, will save a rewind. Thanks, Ron W2CQM/3  
>
>
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