Re: 240/230/220V
'The really big ones are not mass produced[1], but the transformers used in local substations are used in numbers that warrant small-series production.'
They are all made to order above a few tens of KW output, in part due to the fluctuations in copper price. Local substation distribution units are generally about 0.75MW and above. If your regional DNO holds multiple spares then that is their choice so that they can react swiftly to a unit failure rather than wait the 12-16 weeks lead time.
Biting the hand that feeds IT
