What is the maximum percentage of rated output that reverse power shall not exceed during seamless transfers between onboard AC sources for generators?

In seamless transfers between onboard AC sources for generators, the maximum percentage of rated output that reverse power shall not exceed is crucial for maintaining system integrity and preventing damage to the generators and associated equipment. The limit of 15% ensures that during the transition from one power source to another, any inadvertent reverse power flow does not exceed this threshold. This is important because exceeding this limit could lead to unwanted operating conditions, such as overheating or mechanical stress, which could cause significant operational hazards or even mechanical failure of the generators.

The specified percentage is designed to protect the equipment and ensure stable performance during the transfer process. It reflects a balance between operational efficiency and safety, allowing for sufficient tolerance to account for transient conditions while safeguarding the electrical system's reliability.