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Ulusoy dry-type transformers

Eaton Ulusoy dry-type transformers are moisture-proof, making them suitable for operation in humid and highly polluted environments. These transformers work in environments with over 95 % humidity and at temperatures as low as -25 °C. The maximum standard rated power is 3,150 kVA, but this can be extended up to 5,000 kVA upon request.

Rated power
up to 5,000 kVA
Rated voltage
up to 36 kV
Winding material
Aluminium or copper

Core features

Health and safety

  • Environmental class E0 / E1 / E2
  • Non-flammable and self-extinguishing
  • Resistant to moisture
  • Environmentally friendly insulation materials without halogen or nitrogen


Functionality and cost

  • Requires minimal maintenance (once a year)
  • On-site maintenance and repair service available
  • No risk of leaks
  • Can be installed close to highly populated areas 
  • Low operating and installation costs
  • Fire behaviour class F0 / F1 - no special safety measures are required due to the use of self-extinguishing materials 


Life and durability

  • Longer service life due to low partial discharge
  • High insulation levels provide resistance to short circuits and lightning strikes
  • High mechanical resistance against short circuits
  • Cooling increases the nominal power of the transformer by up to 40 %

Safe and reliable transformers

Thanks to compliance with classes E2, C2 and F1, Ulusoy dry-type transformers work safely under difficult conditions, for example at high altitudes and in marine environments. The transformers are manufactured in accordance with the national and international standards TS EN, IEC, IEEE, CENELEX EN. 

Moreover, Eaton also offers designs for specific applications, including:

High K factor: Eaton's K factor transformers address the problems caused by non-linear loads and harmonics. They also compensate for stress on a transformer’s winding insulation to prevent insulation breakdown and premature failure. The result is longer transformer life.

Higher insulation level: Eaton provides increased insulation levels to ensure longer transformer life.

Temperature monitoring: Eaton offers the opportunity to control and monitor temperature levels of both windings and cores.

Housing (enclosure): Eaton will equip transformers with enclosures for outdoor or indoor use, as required.

Higher efficiency: With low loss levels and a long product lifetime, Eaton paves the way for cost savings both in the medium and long term. Designing efficient transformers means better cooling in the case of high temperature rises.

Casting: We use high-quality epoxy resin components for the vacuum casting of the HV coils in our dry-type transformers. Quartz sand is used as the filling material. By customer request, epoxy resin and insulation materials can be used in the coils for the H thermal class.


Thorough testing to ensure safe and reliable transformers

When it comes to delivering utility-grade power, proven reliability and safety are paramount. That's why Eaton tests every transformer rigorously before delivering it to the customer. Aside from routine tests, we also offer type tests and specialised tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

Routine tests

  • Measurement of winding resistance
  • Measurement of voltage ratio and phase displacement check
  • Measurement of short-circuit impedance and load loss
  • Measurement of no-load loss and current
  • Applied voltage test (AC)
  • Induced voltage withstand test (IVW)
  • Partial discharge measurement

Type tests

  • Temperature rise test
  • Lightning impulse test (LI)

Additional tests

  • Determination of noise levels
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