[Amps] Plate transformer current unknown

[Will Matney]

Angelo,

Really you cant tell that way (using the resistance) unless you know the mean lenght of turn, how many turns per layer, and how many layers they are in the winding. This then would give you how long the wire is and you could then use the resistance and the length to determine the wire size. If it's possible to use a micrometer or a wire gauge to see what the secondary wire size is, then one can find out what its rating is. In amateur service, ICAS used anywhere from 700 to 900 circular mils per ampere. CCS uses anyhwere from say 1000 to 1200 cir. mil. per amp. If you can find the wire size, go look at a wire chart for how many circular mils it has and divide by the above numbers to determine its current carrying ability. IE, 10,000 circular mils running at 1000 cir mil per amp = 10 amperes.

Best,

Will


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

On 4/29/05 at 3:01 PM Angelo Karabetsos wrote:

>I would like to find out the current rating of a transformer. Primary 
>voltage taps 0v-110v-115v-208v-230v and secondary taps  3450v-0v-3450v and 
>secondary resistance of 53.5ohms from 0v to 3450v tap and 107ohms from
>3450v 
>to 3450v tap. All measurements done with a simple DMM. The commercial 
>amplifier it came out of has a plate current meter with a max reading of 
>600ma. How could I find out the CCS or ICAS rating?
>Cheers Angelo
>
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