This three-winding oil-immersed power transformer series covers 6300–63000 kVA, with 1st/2nd/3rd energy efficiency grades. It supports both step-up and step-down operations, featuring a YNyn0d11 connection group (customizable) and a 100/100/100% winding capacity distribution. Designed for reliability and low losses, it is ideal for power plants, substations, and industrial applications, meeting IEC 60076 and GB 1094 standards.