What does the 'Open transition delay' aim to prevent?

The purpose of the 'Open transition delay' is specifically to prevent accidental backfeeding of a generator into the utility grid. When switching from utility power to generator power, it is crucial to ensure that the two power sources do not connect simultaneously, as this could result in backfeeding. Backfeeding occurs when power from a generator flows back into the utility lines, potentially endangering utility workers and damaging equipment.

The open transition method involves a brief period during which the circuit is open before switching load from one source to another. This intentional delay ensures that the generator is completely disconnected from the system before reconnecting it, effectively mitigating the risk of backfeeding and ensuring a safe transition between power sources. This approach is especially important in systems where generators are intended to serve as backup power without interfering with the main utility grid.