This series of two-winding oil-immersed power transformers covers rated capacities from 6300 kVA to 63000 kVA, with Class 1 (Type 22), Class 2 (Type 20), and Class 3 (Type 18) energy efficiency options. Featuring a YNd11 connection group and 10.5% short-circuit impedance, they deliver low losses, high reliability, and compact dimensions. Designed for power transmission and distribution systems, they meet IEC and GB standards and are suitable for both step-up and step-down applications in power plants, substations, and industrial facilities.