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TTR Testing a Scott T Transformer Configuration

TTR Testing a Scott T Transformer Configuration

TTR Testing a Scott T Transformer Configuration

(OP)
I am TTR testing a 9 kVA 480/240V 3-phase transformer and am getting different values for each.  Here is what I got:

H1-H2 X1-X2:  1.805
H2-H3 X2-X3:  1.698
H3-H1 X3-X1:  1.580

On a three-phase TTR transformer, all reading would normally be the same, but a Scott-T uses 2-coils to get 3-phases, but how do you hand calculate the expected values?  

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