This series consists of 15-66kV oil-immersed power transformers, suitable for scenarios such as main transformers in subst, power supply for industrial and mining enterprises, grid connection of new energy, and voltage step-up/step-down in urban power grids. Adopting a fully sealed oil-ed structure, they operate stably with low losses and excellent insulation performance, meeting the requirements for both outdoor and indoor installation. 15-66kV oil-immersed power are widely used in urban and rural power grids, power plants, substations, new energy wind farms, and photovoltaic power stations. The product features an advanced design and reasonable structure, energy-saving, safety, and environmental protection characteristics, with performance indicators reaching the advanced domestic level. They offer advantages such as low loss, high efficiency, compact size, low partial, low noise, and strong short-circuit resistance, which can effectively reduce power grid losses and operating costs, yielding significant economic benefits. The core is made of high-quality-rolled grain-oriented silicon steel sheets with a fully mitered joint structure. The low-voltage winding is cylindrical or helical, featuring high mechanical strength, balanced ampere-turn, and excellent short-circuit resistance. The high-voltage winding adopts a continuous or multi-layer cylindrical structure, ensuring uniform impulse voltage distribution.