This series of high-capacity two-winding oil-immersed power transformers covers rated capacities from 31,500 kVA to 240,000 kVA, with Class 1 (Type 22), Class 2 (Type 20), and Class 3 (Type 18) energy efficiency grades. Featuring a YNd11 connection group and 12–14% short-circuit impedance, they are designed for large-scale power transmission and distribution systems. Optimized for low losses and high reliability, they meet IEC and GB standards and are ideal for power plants, substations, and industrial facilities.