Primary metering requires both which types of transformers?

Primary metering involves measuring electrical power in high-voltage environments, requiring both potential (voltage) and current transformers. Potential transformers (PTs) are used to step down the high voltage to a lower, manageable level for measurement, ensuring that the equipment measuring voltage is not exposed to dangerous voltage levels. Current transformers (CTs), on the other hand, are utilized to reduce high current levels to safer, measurable amounts.

This combination allows for accurate monitoring and recording of electrical consumption while ensuring safety and reliability in managing high-power systems. The use of both types of transformers is essential for effective and safe metering in substations or industrial applications, confirming the answer is indeed correct.