how are power transformers rated?

Power transformers are rated based on their capacity to handle electrical power, typically expressed in megavolt-amperes (MVA). This rating indicates the maximum load the transformer can handle without overheating. Additionally, transformers are rated for primary and secondary voltage levels, frequency (usually 50 or 60 Hz), and insulation class. These ratings ensure that the transformer operates efficiently and safely within its designed parameters, accommodating specific applications in power distribution systems.