... C57.12.00, ANSI C 57.12.20 IEC 60076Technical Specification : Ratings:CRGO Silicon Steel Transformers - Upto 167 kVAAmorphous Metal Transformers ... , IEC, ANSI, JIS, etc.Cooling:ONAN, OAInsulating Fluid:Mineral Oil to specificationFrequency:50 Hz, 60 HzPrimary voltage:Upto 33 kV ClassSecondary ...