Transformer for Energy Storage System is designed for battery energy storage facilities that require safe voltage transformation between power conversion systems and medium voltage networks. It can be used in utility storage stations, renewable energy storage, industrial peak shaving systems, microgrids, and backup power facilities. Transformer for Energy Storage System should provide stable insulation, efficient cooling, overload tolerance, low losses, and customized voltage ratios to support bidirectional charging and discharging operation in energy storage applications.