An HV power transformer operates at high transmission voltages (typically 110 kV and above) and high MVA ratings. It must meet stringent insulation requirements, withstand large short-circuit forces, and maintain low losses. HV transformers often use advanced cooling, sophisticated tap changers, and bushings designed for harsh outdoor or substation environments. They are key elements at interconnection, step-up, and step-down points in the transmission network, directly influencing system reliability and stability.