Which relay is most commonly used for Generation?

The most commonly used relay for generation applications is the over voltage relay. This type of relay plays a crucial role in the protection of generators and electrical equipment. When a generator operates, maintaining the correct voltage levels is essential for ensuring stability and efficiency in power generation and distribution. An over voltage condition can cause significant harm to the generator itself and to the connected load, which could lead to equipment damage, overheating, or even unsafe operating conditions.

The over voltage relay monitors the voltage levels and is designed to trip or disconnect the generator from the system if the voltage exceeds a predetermined threshold. This functional capability is vital for maintaining the integrity of the entire power system and preventing disruption in service. In situations where a generator produces voltage levels that exceed safe operating ranges due to factors like load changes or faults, the over voltage relay acts promptly to mitigate risks.

While under voltage, frequency relays, and ground fault relays serve important protective roles, their applications are less focused on the inherent regulation and protection of the generator output voltage compared to the over voltage relay, making it the most common choice for generation protection.