This series of three-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 YNyn0d11 connection group and customizable winding capacity distributions (100/100/50%, 100/50/100%, 100/100/100%), they support both step-up and step-down applications. Optimized for low losses and high reliability, they meet IEC and GB standards and are ideal for large-scale power plants, high-voltage substations, and industrial power transmission systems.