A 15 MVA (Mega Volt-Amperes) transformer is a power transformer with a capacity of 15,000 kVA (kilo Volt-Amperes), used to step up or step down voltage in electrical power systems. These transformers are commonly used in medium-sized industrial or commercial applications, such as large manufacturing plants or shopping centers, where they play a crucial role in stepping down high transmission voltages to more usable lower voltages. Here's a more detailed breakdown: Capacity: 15 MVA is equivalent to 15,000 kVA. Voltage Transformation: 15 MVA transformers can step down high-voltage transmission lines (e.g., 138kV) to lower voltages (e.g., 480V) suitable for industrial equipment and machinery. Applications: They are used in various settings, including industrial sites, electrical rooms, commercial buildings, and power distribution systems. Cooling: They often utilize oil-filled natural air cooling (ONAN) systems for heat dissipation. Configurations: They can be found in both conventional three-phase and delta-wye configurations. Key Components: 15 MVA transformers typically include components like an iron core, windings, fuel tank, oil pillow, radiator, and various valves and gauges. Customization: They can be customized based on factors like frequency (50Hz/60Hz), impedance voltage, and no-load loss. Reliability: With proper maintenance and cooling, they offer reliable and long-lasting performance.