Cooper oil-filled transformers are primarily used for electrical power distribution and voltage transformation in utility and industrial applications. They effectively manage electrical energy by stepping down or stepping up voltage levels to ensure efficient power delivery. The insulating oil within these transformers not only facilitates electrical insulation but also aids in heat dissipation, thus enhancing operational reliability and longevity. Furthermore, these transformers are often found in substations, industrial sites, and commercial buildings where they play a crucial role in maintaining stable power supply and protecting electrical equipment from fluctuations. Overall, Cooper oil-filled transformers are integral to the infrastructure that supports modern electrical distribution systems.