What must be provided during seamless transfers between onboard AC sources?

To ensure safe and effective seamless transfers between onboard AC sources, reverse power protection is the key requirement. This protection prevents the possibility of power from one source inadvertently flowing back into another source, which could occur during the transfer process. Such reverse currents can cause damage to equipment or create hazardous conditions, particularly when generators are involved.

Managing the direction of power flow is critical during transitions, as it safeguards both the sources involved—such as generators and shore power—from potential faults and enhances the reliability of the entire electrical system. While other protective measures like voltage protection and isolation protection are important in electrical systems, they specifically address different issues rather than the unique challenges posed during seamless source transfers. Load balancing protection, while beneficial for even distribution of power, does not directly aid in the prevention of reverse power flow during these transitions. Thus, reverse power protection is essential for maintaining both safety and operational integrity during such operations.