What is the field protective relay in series with?

The field protective relay is designed to monitor the condition of the motor shunt field and operate in series with it. This setup is crucial for ensuring that the motor operates safely and efficiently. The relay's primary purpose is to detect any abnormalities, such as overcurrent or grounds, in the motor shunt field circuit. If a fault condition arises, the relay will respond by disconnecting the motor from the power supply to protect both the motor and the overall system from potential damage. Therefore, being in series with the motor shunt field allows the field protective relay to effectively monitor and control the flow of current, maintaining the integrity and safety of the electrical system.