"At our core, Niagara Transformer has the best people, taking on the toughest engineering challenges with the highest quality and the shortest lead times." - John F. Darby, President

Oil-Filled Transformers


One of the most reliable transformers on the market today is the oil filled transformer. With great efficiency, oil-filled transformers have a wide range of applications; including commercial and industrial. The oil-filled transformers from Niagara Transformer can support high voltages up to 138 kV, 650 kV BIL and ratings up to 50 MVA (ONAN).

Niagara Transformer offers high quality, custom built oil-filled transformers. Using only high-grade materials, combined with Niagara Transformer's superior engineering, our oil filled transformers will deliver years of reliable service!

oil filled transformer


  • Up to 50 MVA base rating
  • Up to 138 kV
  • Up to 650 kV BIL
  • Single phase, 3 phase
  • 60 hertz or 50 hertz
  • 55ºC or 65ºC rise
  • Copper or aluminum
  • Circular layer, rectangular layer, circular disc
  • Harmonic allowances up to K-20
  • Sealed tank or conservator tank construction
  • With or without on load tap changers
  • Up to 20% IZ
  • IEEE/ANSI or IEC Standards
  • Full range of country-specific certifications
  • High ambient designs available
  • High elevation designs available
  • Classified area designs available through Class 1 Division 2 Group C/D
  • Seismic designs: Zones 1-4
  • UL, cUL, CSA certified 
  • Type II Mineral Oil, EnviroTemp FR3, Midel, and others
  • Full in-house testing



Voltage Regulator
Security Code...
Security Captcha
Type Code Above Into This Box

How Can We Help?

Security Code...
Security Captcha
Type Code Above Into This Box

Niagara Transformer
Niagara Transformer
Niagara Transformer