This series of high-capacity 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 optimized for low losses and high reliability. Designed for large-scale power transmission and distribution systems, they meet IEC and GB standards and are ideal for power plants, high-voltage substations, and industrial facilities, with optional low-voltage configurations (66kV/69kV).