What is the purpose of a potential transformer in a security system?

The purpose of a potential transformer in a security system is to reduce high voltage to measurable levels. This is crucial in ensuring that the system can safely and accurately monitor voltage levels without exposing sensitive equipment to potentially damaging high voltages. By stepping down the voltage, the potential transformer allows the security system to operate effectively and in compliance with safety standards, enabling reliable monitoring and functioning of various components within the system.

While the other options relate to different aspects of electrical engineering and security system functionality, reducing high voltage to manageable levels is the specific role of a potential transformer, making it essential for the safe operation and integrity of the security system.