Duh I don't know. Maybe because it's already in the business? http://howard-ind.com/Power/Product/DisplayDocument/52
A more important question is, "When are you going to switch on your brain over here in this swamp?"* __________________ * Yes, I am aware that "easymon1," may not be a real person, but only a group of malicious people.
HV transformers > 100 kV? What's the size of those puppies, piezoe? Greater than 100 KV? These bad boys are pretty big sizewise. The one you pictured is not. See what I mean Vern?
up to 750KV ( 750,000 Volts) is standard medium substation. The one pictured is probablty ~125 KV. Howard industries, among the world's largest transformer manufacturers, Located right here in the good ole US of A. YeeeHawwwwwwwwww.. Go pg 5 in their catalog (click the link). there is a chart that gives the characteristics and features of their regular medium substation models you can order any time. They will be happy to make a custom job for you if you need it... P.S. They deliver. (You might need a rail line for some of the heftier models.)