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Problem #2-8 • A 480 – 120 V, 60 Hz transformer has its high voltage winding connected to a 460 V system, and its low voltage winding connected to a 24/32.8°Ω load. Assume that the transformer is ideal. Determine – – – – – the secondary voltage the secondary current the primary current the input impedance at the primary terminals the active, reactive, and apparent power drawn by the load The secondary voltage 480 4 120 E p 460V Es 115V a 4 a The secondary current Es I s Z load Es 1150 Is 4.79 32.8 A Z load 2432.8 The primary current Is I s aI p I p a 4.79 32.8 Ip 1.2 32.8 4 The input Impedance at the primary terminals Z in' a 2 Z load (4) 2 (2432.8) Z 38432.8 ' in The active, reactive, and apparent power drawn by the load S Vs I s* (115V )( 4.7932.8 A) 550.8532.8VA P Vs I s cos load (115V )( 4.79 A)(cos 32.8) P 462.7W Q Vs I s sin load (115V )( 4.79 A)(sin 32.8) Q 298.56VARS