What is a potential transformer primarily used for?

A potential transformer is primarily used for measuring high voltages. It steps down voltage levels to a more manageable and safe level that can be easily read by instruments or used in control circuits. This is particularly important in high-voltage systems where it is essential to monitor voltage levels without exposing measuring devices directly to dangerous voltage levels.

By converting high voltage to a lower voltage for instrumentation and control, potential transformers enable effective monitoring and controlling of electrical systems while ensuring safety for personnel and equipment. This is critical in the operation of power systems, where accurate voltage measurement is necessary for system stability and protection.

In terms of the other available options, while potential transformers play a role in voltage management, their main function is not regulating power flow or directly impacting power distribution. Voltage reduction is a characteristic of how potential transformers operate, but their core purpose aligns more closely with safe measurement of high voltages rather than merely reducing voltage for all applications.