A transformer rated at more than 500kVA is considered a(n)?

A transformer rated at more than 500 kVA is classified as a power transformer. This classification stems from its design and purpose, which typically involves handling larger amounts of power and facilitating transmission at higher voltages over long distances. Power transformers are essential in electrical systems for stepping up or down voltage levels to minimize transmission losses and ensure efficient power delivery, which is particularly crucial for bulk power applications.

In contrast, distribution transformers usually operate at lower power ratings (typically less than 500 kVA) and serve to distribute electricity to end users at usable voltage levels from substations. Isolation transformers are designed to isolate circuit components for safety or equipment protection, and step-down transformers only refer to the functionality of reducing voltage levels without regard to power capacity. Thus, the classification of a transformer as a power transformer, based on its capacity rating, is crucial for understanding its role and applications in power systems.