A single-phase, 5-MVA, 20/8.66-kV transformer is protected

Chapter , Problem 10.26

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A single-phase, 5-MVA, 20/8.66-kV transformer is protected by a di_erential relay with taps. Available relay tap settings are 5: 5, 5: 5.5, 5: 6.6, 5: 7.3, 5: 8, 5: 9, and 5: 10, giving tap ratios of 1.00, 1.10, 1.32, 1.46, 1.60, 1.80, and 2.00. Select CT ratios and relay tap settings. Also, determine the percentage mismatch for the selected tap setting

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