Q3. (CLO 1) (5 marks) (15 minutes) A 20 KVA, 400/3000 V transformer is tested and the following results are obtained. In

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Q3 Clo 1 5 Marks 15 Minutes A 20 Kva 400 3000 V Transformer Is Tested And The Following Results Are Obtained In 1 (58.7 KiB) Viewed 16 times

Q3. (CLO 1) (5 marks) (15 minutes) A 20 KVA, 400/3000 V transformer is tested and the following results are obtained. Input to low voltage winding when high voltage side is open circuited, the meters gave the following results. 400V, 2.5 A and 450 W. Input to low voltage winding when high voltage side is short circuited the meters gave the following results. 11V,100A and 500W. Calculate (i) (iii) (2 marks) Determine the Equivalent resistance and reactance of the core with respect to primary. Determine the Equivalent resistance and reactance of the core with respect to secondary. (1 mark) (2 marks) Calculate the efficiency of the transformer when it is delivering 85% of full load at 0.8 pf lagging?