Short-Circuit Testing of Medium Power Transformers by Southern California Edison Company Part I - Test Procedures and Results

Part I of this paper describes the extensive field verification program and results for the prequalification and acceptance by short-circuit through-current testing of 15/20/22.4 MVA, 67/12.47-kV, or 66/17.2-kV, three-phase medium power transformer designs purchased in quantity from many vendors for general use on the 69-kV subtransmission system of Southern California Edison Company. Particular emphasis has been given to applying the proposed IEEE Power Transformer Short-Circuit Test Code procedures and proof of satisfactory performance.