Historical
IEEE Std C57.12.10-1997
Transformers - 230 kV and Below, 8333/10 417 kVA 3PH without Load Tap Changing; 100 000 kVA with Load Tap Changing - Safety Requirements
Covers certain electrical, dimensional and mechanical characteristics and takes into consideration certain safety features of 60-hz, two-winding liquid-immersed transformers used for step-down or step-up purposes rated 833/958 through 8333/10417 kVA, single phase; 750/862 through 60 000/80 000/100 000 kVA, three-phase without load tap changing; and 3750/4687 through 60 000/80 000/100 000 kVA with load tap changing.
Institute of Electrical and Electronics Engineers [ieee]