Mathcad - 05-21 - = V srated 120 volt = V prated 7200 V =...

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So the three-phase transformer is rated 7200 V -- 208 V 208 V V x 207.846V = V x 3 V xLN = The line voltage on the secondary will the the square root of three times the line to neutral voltage, so V xLN 120V = V xLN V srated = The low side is connected in wye, so the line to neutral voltage will be equal to the coil rating of each phase V h 7.2kV = V h V prated = Since the high side is connected delta, the line voltage will be equal to the coil rating of each phase b. a. H1 H2 X1 X2 H1 H2 X1 X2 H1 H2 X1 X2 Delta-Wye Connection A B C n a b c Solution S rated 10 kVA
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Unformatted text preview: = V srated 120 volt = V prated 7200 V = Problem 5-21: kVAR kW kVA kW 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 34.641 =...
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This note was uploaded on 03/26/2012 for the course ECET 231 taught by Professor Piller during the Spring '12 term at Purdue University-West Lafayette.

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Mathcad - 05-21 - = V srated 120 volt = V prated 7200 V =...

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