Core type power transformers up to 400MVA 525kV Shortest lead time in the industry Shell type power transformers up to 1400MVA 500kV The most reliable transformers made right here in the USA


5-Axis Insulation Milling

Each power transformer is custom designed to succeed in the environment they are placed in. Our design philosophy requires elimination of sharp edges on all insulating parts (wood structures, spacers, rings etc.) and tolerances on winding coil dimensions to be measured in millimeters. Our stringent process requires customized insulating parts, achieved using Axis 5 – mil Machine. Onsrud Axis 5 is used to manufacture internal wood supports, structures and insulation components. The machine is computer controlled for accuracy, and can manufacture directly from AutoCAD, Inventor, and Master Cam 3-dimensional drawings. We also use a 3-Axis milling machine for other insulation components.

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