I am not into 3-phase but from my long ago college days I would see no reason for the star to star not being correct and I guess that the critical factor is the star isolating transformer. I would also agree with your transforms for different voltages / frequencies. You don't say which of the three measuring networks specified in EN 60990 that you intend to use, but that of Fig 4 is the same as that used in EN 60950 which may, or may not, be a reason for selecting that version. Checking the two standards, I find that of figure 5B in EN 60950 to be easier to understand, but as I have already mentioned, I'm not really familiar with 3-phase. Regards, Neil Helsby
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