What is the automatic transfer time for Utility-to-Generator?

The automatic transfer time for Utility-to-Generator scenarios is typically designed to ensure a balance between quick response and system stability. In the context of the correct choice, a transfer time of 3 seconds for source loss allows for a rapid switch from utility power to generator power, which is crucial for minimizing downtime and maintaining essential services during an outage.

The added time of 12 seconds for stabilization is also significant in this context. Once the generator has taken over the load, stabilization involves the generator ramping up to its full output and ensuring that the electrical parameters (like voltage and frequency) are within acceptable limits. This two-stage process is valuable since it prioritizes both immediate power restoration and the reliability of the system afterward.

This combination makes the option a well-rounded approach to automatic transfer, striking a balance between quick activation and ensuring that the system is stable before operating at full capacity. Other choices may either allocate too much time, which could lead to unnecessary downtime, or lack the appropriate stabilization phase needed for reliable generator operations.