What type of transformer serves as the distribution transformer for substations, providing both single-phase and three-phase power?

The correct answer is the type of transformer that functions as the distribution transformer for substations, delivering both single-phase and three-phase power. This transformer is crucial in adjusting the voltage levels for the power distributed to consumers and various loads. It typically steps down the high voltage from the transmission system to a lower voltage suitable for use in residential, commercial, or industrial applications.

Service transformers are specifically designed to handle both single-phase and three-phase connections, allowing flexibility in meeting diverse power demands. They also often come equipped with features that ensure efficient operation, such as various primary and secondary voltage ratings to match the needs of different electrical systems.

In substations, these transformers play a foundational role, bridging the high-voltage transmission lines and the end-users of electricity, ensuring that power delivery is smooth and reliable. Their design and functionality make them essential for effective power distribution in electrical grid systems.