Frequently Asked Questions
1. What winding material is used?
Uptegraff manufacturers with aluminum and/or copper.
2. Are aluminum windings as dependable as copper windings?
Uptegraff was an industry leader in building transformers with aluminum. The first unit was manufactured in 1966. Aluminum wound units have proved to provide equal reliability (vs copper) at a great reduction in cost.
3. Are Uptegraff transformers manufactured to any standard other than customer specifications?
All units conform to the latest revisions of IEEE and NEMA standards. We are more than willing to build to other standards such as IEC, Canadian, Mexican, government, etc. upon request.
4. Will Uptegraff repair/modify/refurbish transformers?
A large part of our business in involved in the repair of older transformers of any make.
5. Does Uptegraff manufacture transformers intended for rectifier applications?
We routinely manufacture specially designed units for:
  • DC rectification
  • variable speed drives
  • drag line duty
  • HVDC testing
  • Harmonic current spectrum data is often required for proper design of this type unit.
6. What size (or voltage) units can Uptegraff manufacture?
  • 1-5000 kVA thru 120,000 volts
  • 1-10000 kVA thru 69,000 volts
  • 1-15000 kVA thru 46,000 volts
  • 1-20000 kVA thru 34,500 volts
7. Does Uptegraff manufacture Load-Tap-Changing units?
Yes, you have your choice of reactive or resistive types. Vacuum style available.
8. What style of cores are available?
  • 3-legged
  • 4-legged
  • 5-legged wound
9. What dielectric fluids are available?
  • Mineral oil
  • Envirotemo FR3
  • RTEmp (less flammable)
  • Silicone (less flammable)
  • Beta fluid (less flammable)
10. Can a unit be designed to directly replace an existing unit?
We often design units to directly replace existing units. In many cases the unit capacity can be increased utilizing the same space.
11. What other type equipment does Uptegraff manufacture?
  • Specialty and distribution dry type
  • 1 ph., 2 ph., 3 ph., 6 ph., 12 ph., etc.
  • Dry series reactors
  • Liquid filled series and shunt reactors
  • Motor starting transformers and reactors
  • Scott "T" transformers
  • Rectifier duty transformers
  • LTC transformers
  • Auto transformers
  • Transformers connected directly to generators
  • Station service transformers
  • Welding transformers
  • Mine duty transformers
  • Drag line duty units
  • Multi-voltage units
  • Zig-Zag grounding transformers
  • Phase-shifting transformers
  • Units for use aboard ship
  • Induction furnace transformers
  • Testing transformers
  • Trailer mounted transformers
---and units with combinations of any of the above.
If you have a non-standard requirement, call Uptegraff
12. What testing is done on your units?
All standard IEEE tests are performed on all units. Other special tests are available upon request.
13. What style of windings does Uptegraff offer?
  • Layer type (elliptical)
  • Disc type
14. Can Uptegraff manufacture equipment than can be coordinated with other manufacturer's equipment?
Yes, we can manufacture equipment that will throat flange coordinate with switchgear and/or load tap changing equipment.
15. Can Uptegraff manufacture equipment for special duty applications?
Yes, we manufacture transformers for hazardous duty applications, corrosive environments, and earthquake prone areas.
16. Does Uptegraff have field service personnel available?
17. Is Uptegraff's engineering staff available to discuss applications and specifications with a customer?
18. Can Uptegraff supply spare parts?
Call. We may be able to help.

© Copyright 2002 R. E. Uptegraff Manufacturing Co.
Power Transformers, Distribution Transformers, Industrial Transformers, Padmount, 10000 5000 kVA, 10 20 MVA, Custom Designed Transformers, 46 69 125 kV