What is the hardest part of a project to furnish and install a 75 MVA GST Power Transformer?  Like most difficult questions, the immediate answer is, “It depends.” As someone who has actually worked in the field on switchgear and transformers, I think the hardest part is getting the transformer to the final installation site, especially if the site is in South America.  Getting it from the manufacturing floor to the installation site and on the pad without any bumps, so to speak. This is a huge worry because things can happen that are out of your control.  At least on the manufacturing floor and at the installation site, you usually have total control.  Performing the engineering, specification, physical design, and identifying auxiliary devices can be tedious and requires  diligence.  Commissioning on site is a lot of work and there are plenty of opportunities for things to go wrong.  But you are in control, except for the weather.  The really big worry starts when that 75 MVA transformer leaves the manufacturing plant door for South America; gets transported to the exporting site; ships over a lot of water to the destination dock; gets unloaded; then gets transported overland again to the construction site; and finally gets rigged and craned on to the concrete pad.  And all this action is monitored with an attached, very sophisticated, “Impact Recorder” that monitors and records bad things that may happen to the transformer from the time is leaves the manufacturer to the time is rests on the pad, one ocean and 1000s of miles away.  At the end of the trail, so to speak, the data on the monitor is downloaded to a computer and analyzed for the possibility of damage to the huge and very costly mega VA GST Power Transformer.  Nerve wracking.  So, I vote transportation to be the hardest part of a project involving large MVA Oil Filled Power Transformers.