You have a much much smaller transformer that you close across from the HV side to energize the secondary side of the main transformer to pre-magnetize the core, prior to closing the primary HV feeder breaker to the primary side of the transformer. It almost completely eliminates inrush current and should greatly prolong the life of the transformer and the breaker.
The more complicated version has been in use on some drillships for over a decade, but I’d think the ROI is definitely there for a simplified version on something like a cargo ship bow thruster transformer. It also means you can place online without needing an extra generator.
Just wondering if this is actually used in that industry too now?
I’m familiar with the AKA version (again, built to a level not generally needed on a regular cargo vessel, but there’s a diagram in the PDF linked on their webpage)