I think those values are unrealistically low. I dont recall ever seeing a 25KVA lower than 1.8%, typically 1.9-2.4. The one photo is the transformer serving my house, its 2.4%, I have a 15 KVA pad here that is 1.9%. Here is a 167 I came across with 1.8%, lowest I have ever seen.The AIC you give for the 25 kVA single phase transformer would have to be 0.99%Z or 1%Z. Do you have transformers this size with that low of an impedance value? Just curious. Kind of the same question on the 167 kVA with a 1.5%Z which also seems kind of low.
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