Well the first part seems straightforward enough, add up the combined loads and throwing 25 to 50% for Murphy or expansion. "A good engineer is a wee bit conservative at least on paper"
1. Vpu = v
IM just kidding, found this link while I was trying to figure out exactly what you were talking about, I hope it will be of some help. However your use of the word minimum is scary, I'm not kidding about Murphy leave enough to cover him.
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"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man" George Shaw
thanks for this cocern..bt i know per unit calculation ..i need exact method for calculating the rating of any transformer and its percentage impedence...
Now I am curious to, I had assumed you were looking to set up multiple transformers, i.e. production facility. If you can provide a little more information about your application it might be helpful.
PS I had read Read a couple of posts when I responded. Somehow I was thinking you were looking for the minimum requirements, to feed multiple transformers.
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"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man" George Shaw