What does seamless transfer require from AC power sources prior to the process?

Seamless transfer between AC power sources is primarily dependent on synchronization. This process ensures that the frequency, phase, and voltage of the incoming power source match those of the existing power source. If these parameters are not synchronized, a transition cannot occur smoothly; instead, it could lead to voltage spikes, frequency fluctuations, or disruptions in power supply.

Synchronization guarantees that the power sources can connect and disconnect without interrupting the electrical load, maintaining system stability and preventing any potential damage from sudden changes in electrical parameters. This is particularly crucial in applications where continuous power is vital, such as in critical systems on boats or in other marine environments, where operational reliability is paramount.

While isolation, calibration, and voltage adjustment might play roles in different contexts of electrical systems, they are not essential for the seamless transfer process itself. Isolation is more related to safety and preventing feedback, calibration ensures measuring instruments are accurate, and voltage adjustment might be involved but is not necessary for achieving seamless transfer. Thus, synchronization stands out as the key requirement for smooth transitions between power sources.