Which type of regulator is primarily used on distribution systems?

The step regulator is primarily used on distribution systems because it is designed to control voltage levels and maintain voltage stability in the electrical distribution network. In distribution systems, it's essential to keep the voltage within specific limits to ensure the safe and efficient operation of electrical appliances and to minimize losses.

Step regulators function by selectively switching a series of taps on a transformer to adjust the voltage as needed. This tap-changing capability allows them to respond to variations in line load, effectively helping to manage voltage drops that can occur due to changes in demand throughout the day.

In contrast, other types of regulators perform different roles or are better suited for other applications. Induction regulators, for instance, are typically used where variable voltage needs arise but are less practical for typical distribution systems. Dynamic regulators are often used in more complex systems where fluctuating loads are present but might not be efficient or cost-effective for general distribution. Static regulators are more suited for maintaining power quality in specific applications rather than addressing the broader voltage regulation needs of a distribution system. Therefore, the step regulator is the most appropriate choice for maintaining voltage control in electrical distribution scenarios.