Three Phase Transformer Bank Connection and Calculations - Prof. Carl J. Spezia, Assignments of Engineering

Download Three Phase Transformer Bank Connection and Calculations - Prof. Carl J. Spezia and more Assignments Engineering in PDF only on Docsity! ET 332b Three Phase Transformer Connection Homework Three single phase transformer are to be connected to form a three phase bank. The bank will supply a combined single and three phase load of 225 kVA. (Assume that the single phase load is equally divide between all phases) The primary side connects to a 12.47 kV system and the secondary side is grounded wye connected. The secondary voltage fevels are to be 2771480 V. Each winding in the secondary is rated at277 Y. 1.) Draw the necessary connections in the figure to achieve a 12.47 kV delta / 2771480 V grounded v,rye secondary connection with 30o phase shift across the bank. Use T1 for phase A,T2 for phase B, and T3 for Phase C. 2.) What is the turns ratio of each of the single phase transformers in the bank? 3.) What should the power rating of each of the three transformers be to handle the anticipated bank load? 124/ kV r le i tc, l \ l . l.-,o'. ^- r-.J . [ l-r- l i . [ur-^,l T1 o Tlr a r-) lr a r l TA |,:r=j r.r ] r;n-l r ['J [u-] lJ Spring 2002 ?77 / 480 V Wye Gr-ouncJecl 3phfrtw'ups