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EXPERIMENT 1 An open circuit and short circuit tests were performed on a single-phase transformer (100 VA, 230/15.6 V) and the following results were obtained. Open-circuit test results 110 130 150 170 Voc(V) 50 70 90 190 210 230 250 loc (A) 0.014 0.015 0.017 0.020 0.023 0.029 0.038 0.054 0.075 0.103 0.136 Poc (W) 0 0 0 0 1 2 3 4 6 8 12 V. (V) 3.7 5.2 6.7 8.1 9.6 11.1 12.6 14.1 15.6 17.0 18.5 Short-circuit test results 21.6 V Vsci, Isc1.FL 0.44 A Wsc1.FL 8 W Isci.pl 5.9 A EXPERIMENT 2 Measurements were done on 3x single-phase transformers (100 VA, 230/15.6 V) connected as shown in the diagram below

EXPERIMENT 2 Measurements were done on 3x single-phase transformers (100 VA, 230/15.6 V) connected as shown in the diagram below Van Primary windings Ven Vhn Load Secondary windings And the results were obtained

Measured voltages across windings for a 50 W load VP_Line-Neutral (V) Vs_Line-Line (V) Phase A 227.8 16.5 Phase B 229.1 16.6 Phase C 230.1 16.4 17 Measured voltages across windings for No-load VP_Line-Noutral (V) Vs_Line-Line (V) Phase A 228.8 Phase B 229.7 17 Phase C 230.5 16.9 1.1 1.2 In experiment 2 Calculate what the line-to-line voltage and the phase voltage must be on the primary side for an ideal transformer. In experiment 1 calculate the equivalent impedance (Zeq) referred to the low voltage side. From the equivalent impedance (Zeq) determined in experiment 1, calculate what the primary voltage must be for a 150 W 3-phase delta-connected load at unity power factor 1.3