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Subject: Sizing Wire For Low Duty Cycle Transformer

Date: 01/08/01 at 9:28 PM
Posted by: Paul Hoffman
E-mail: toolnut@seanet.com
Message Posted:

> Does anyone know what a good value would be for the circular mils/ampere
> for a very low duty cycle transformer application? I have a bandsaw
> blade welder that had a blown primary and when I bought it the winding
> was gone. I can see where the lead was clipped, but if I use the number
> I would get for that size wire I would come up with 135 circular
> mils/ampere, and that seems low to me.
>
> I know that a continuse duty transformer's circular mils/ampere ranges
> from 500 to 1000 depending on the cooling situation.
>
> In this case the welder would have power to the primary for 30 seconds
> (weld) then off for 30 seconds and then on again for 30 seconds
> (anneal), and then off for 2 to 5 minutes (set-up for next blade to be
> welded).
>
> You can reach me at toolnut@seanet.com
>
> Thanks for the help - Paul

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