What is the purpose of a current transformer in protection systems?

The purpose of a current transformer in protection systems is to reduce high currents to manageable levels for monitoring and protection. Current transformers are designed to step down high primary current to a lower secondary current that is proportional to the primary current. This allows for the safe measurement and monitoring of current levels within electrical circuits, which is essential for the operation of protective relays and other instrumentation.

By transforming high currents to a lower level, current transformers enable the safe operation of monitoring equipment without the risk of damage from high current levels. This function is crucial in protecting both equipment and personnel while ensuring accurate readings and reliable protection of electrical systems. The correct answer reflects the fundamental role of current transformers within protection schemes for electrical systems.