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Home > Forums > Electrical / Electronic Engineers > Activities > Circuit Design Forum

Calculating %Z from %IZ

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RazmikH (Electrical)

15 Nov 10 17:25

I recently ordered a few 208V to 208V isolation transformers. I asked the manufacturer for the impedance data. I was given %IZ, %IX, and X/R. When I calculate the %Z, the results are larger than expected. I may be doing something wrong. Can anyone tell me how to calculate the %Z from the provided data? These are 15kVA to 150kVA transformers.

waross (Electrical)

15 Nov 10 21:09

Use the nameplate data to calculate the impedance and reactance in ohms instead of PU.
Then use the X/R ratio and Pythagoras' theorem.

Bill
--------------------
"Why not the best?"
Jimmy Carter

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