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Unformatted text preview: 120 volt = V prated 7200 V = Problem 5-22: kVAR kW kVA kW So the three-phase transformer is rated 12471 V -- 208 V or nominally 12.5 kV -- 208 V c. The total three phase power rating is simply three times the individual phase S rated3ph 3 S rated = S rated3ph 30kVA = d. The phase ratio is the ratio of the voltage ratings for one of the single-phase transformers that comprise the bank PR V prated V srated = PR 60 = The bank ratio is the ratio of the rated line voltages found in part b: BR V h V x = BR 60 =...
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- Spring '12