What type of potential transformers are the most common?

The most common type of potential transformers are wire-wound and capacitive coupled transformers. Wire-wound potential transformers are designed to accurately measure voltage levels in power systems and are widely used due to their reliable performance and ability to handle high voltage applications. They consist of a coil of wire wound around a magnetic core, which helps in stepping down the voltage for measurement and protection purposes.

Capacitive coupled transformers, on the other hand, utilize capacitive voltage dividers to achieve measurement accuracy. They are often used in installations where long-distance measurement is required, as they can be more effective in transmitting voltage information without significant losses.

Combining both types, the use of wire-wound and capacitive coupled transformers provides a versatile solution for potential measurement in various electrical applications, making them the most common option found in power distribution and transmission systems.