Check the insulators

Looking at the insulators the high voltage would be at the long one, the lower voltage at the short ones.
Regards, Volker

High side...

insulators are for the connection to the transmission voltage, that's the ones with the red tops. The low side are the small ones, one for each phase and a neutral insulator. The tall stack one, closest to the camera in the photo are lightning arrestors. The model is a three phase transformer. The radiator like appendages are cooling fins, oil runs through them.        John 

Are they really INSULATORS?

My simple mind can't understand why incoming and outgoing wires would be connected to insulators. Seems that a real insulator would prevent the current from traveling between the wires and the core of the transformer.

Are those structures instead oversized insulation, each surrounding a conductor?

drJolS

I seem to recall that they

I seem to recall that they are called insulated bushings.  As the primary and secondary wires are uninsulated you need to maintain a separation distance between the wire and the transformer body to prevent arcing.  The bushings themselves have the insulator on the outside and a conductor running down the center into the transformer.

Andrew

Graphic

Thank you