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Medium-voltage transformers

Dry type transformers

Eaton dry type transformers are moisture-proof, making them suitable for operation in humid environments and where pollution is high. These transformers work in environments with over 95% humidity as well as at temperatures down to -25°C. The standard rated power goes up to 3150 kVA, but can be extended up to 5000 kVA upon request.

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Rated power
up to 5000 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 using 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 behavior class F0 / F1 - special safety measures not required due to self-extinguishing materials 

 

Life and durability

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

Looking for something more specific?

Reach out to us and find the ideal solution for your project!

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Take a look at one of our transformer factories

In our factories we produce a wide range of transformers to meet all customer requirements for the following applications: hospitals, airports, factories, commercial buildings such as shopping centers, data centers, environmentally sensitive areas, fire-risk areas, undergrounds and trains and wind power plants. Making what matters work.

We are Tier 2 ready – are you?

The new Tier 2 Ecodesign Directive is in effect since July 1, 2021. Building on its Tier 1 experience, Eaton is very well prepared for the changes – already designing and manufacturing transformers that don't just meet but exceed Tier 2-compliance requirements.
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Learn more

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 IEC, IEEE, CENELEX EN, BS EN 60076-11, BS 50541-1:2011.

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.

eaton-ulusoy-dry-type-transformer-casting
eaton-ulusoy-dry-type-transformer-both-types

Versatile accessories to customize your transformer

Our standard accessories include two-way adjustable wheels, lifting rings, terminals for earthing connections, temperature control relays and PT100 thermal sensors and relays. We also offer additional accessories for further customization: PTC thermistor (can be used instead of PT100), cooling fans, fan control relays, socket connections for high voltage connections, protection cells, high voltage surge arresters and anti-vibration pads. Find out more about our additional accessories in the gallery below!

Wheels are available in various diameters, selected to bear the transformer weight. They are shipped with the transformer as per customer request.
Anti-vibration pads are placed on the base of the transformer wheels. These soften the transformer vibrations while in operation.
PT100 sensors are used in each phase for temperature control inside transformer low voltage windings. They can be used in the core upon customer request.
Cooling fans can be placed under the coils to keep them cool and temporarily increase the transformer's power by 40%.
Temperature control relay are designed to measure, control and alert when the transformer overheats. Overheating can result from high ambient temperatures or transformer winding overload. For this purpose, PT100 or PTC temperature sensors are installed in low voltage windings with the highest temperature. When an alarm sounds the breaker is activated and fan cooling system (if installed in the transformer) turns the fans on and off automatically.

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 rigirously before deliveringit to the customer. Aside for Routine tests as a standard, we also offer Type and specialised testing to meet our customers’ requirements at an additional cost. Making what matters work for our customers in a safe and reliable way.

Routine tests

  • Measurement of winding resistance
  • Measurement of voltage ratio and check of phase displacement
  • 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

Discover our medium-voltage transformers

In our factories, we produce a wide range of transformers to meet all customer requirements for the following applications: hospitals, airports, factories, commercial buildings such as shopping centers, data centers, environmentally sensitive areas, fire-risk areas, undergrounds and trains and wind power plants. Learn more about our transformers below!

Specifications

Technical information

Voltage 7.2 kV - 12 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 520 3800 6 59 1260 750 1260 520 125 40 1090
400 750 5500 6 61 1370 950 1360 670 160 50 1370
500 902 6413 6 62 1410 950 1470 670 160 50 1640
630 1100 7600 6 63 1440 1100 1540 670 160 50 1790
800 1300 8000 6 64 1530 1100 1620 670 160 50 2200
1000 1550 9000 6 65 1610 1100 1640 820 160 50 2550
1250 1800 11000 6 67 1650 1100 1740 820 160 50 2950
1600 2200 13000 6 68 1760 1100 1850 820 160 50 3560
2000 2600 16000 6 72 1820 1200 2190 1070 200 70 4360
2500 3100 19000 6 73 1930 1200 2300 1070 200 70 5230
3150 3800 22000 6 76 2030 1200 2280 1070 200 70 5770

Voltage 17.5 kV - 24 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 520 3800 6 59 1460 750 1380 520 125 40 1470
400 750 5500 6 61 1460 950 1640 670 160 50 1730
500 902 6413 6 62 1540 950 1640 670 160 50 1940
630 1100 7600 6 63 1520 1100 1640 670 160 50 2050
800 1300 8000 6 64 1590 1100 1800 670 160 50 2620
1000 1550 9000 6 65 1740 1100 1770 820 160 50 2980
1250 1800 11000 6 67 1770 1100 1860 820 160 50 3440
1600 2200 13000 6 68 1800 1100 2070 820 160 50 3950
2000 2600 16000 6 72 1860 1200 2200 1070 200 70 4520
2500 3100 19000 6 73 2020 1200 2200 1070 200 70 5310
3150 3800 22000 6 76 2100 1200 2320 1070 200 70 6100

Voltage 36 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 598 4180 6 59 1550 750 1800 520 125 40 1960
400 825 6050 6 61 1610 950 1840 670 160 50 2280
500 1037 6413 6 62 1660 950 1640 670 160
 50 2550
630 1265 8360 6 63 1640 1100 1970 670 160 50 2550
800 1495 8800 6 64 1720 1100 2010 670 160 50 3070
1000 1782 9900 6 65 170 1100 2060 820 160 50 3440
1250 2070 12100 6 67 1850 1100 2120 820 160 50 3940
1600 2530 14300 6 68 1900 1100 2270 820 160 50 4500
2000 2990 17600 6 72 2000 1200 2380 1070 200 70 5290
2500 3565 20900 6 73 2090 1200 2520 1070 200 70 6230
3150 4370 24000 6 76 2260 1200 2530 1070 200 70 7610
spacer

Voltage 7.2 kV - 12 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 468 3400 6 57
 1320
 750 1280 520 125 40 1240
400 675 4500 6 60 1490 950 1440 670 160 50 1760
500 811 5630 6 61 1500 950 1500 670 160 50 1900
630 990 7100 6 62
 1500 1100 1500 670 160 50 1920
800 1170 8000 6 64
 1550 1100 1640 670 160 50 2340
1000 1395
 9000 6 65
 1670 1100 1650 820 160 50 2730
1250 1620
 11000 6 67
 1680 1100 1780 820 160 50 3160
1600 1980
 13000 6 69
 1770 1100 1980 820 160 50 3860
2000 2340
 16000 6 71 1870 1200 2110 1070 200 70 4470
2500 2790
 19000 6 73
 2020
 1200 2190 1070 200 70 5550
3150 3420
 22000 6 75
 2120 1200 2310 1070 200 70 6410

Voltage 17.5 kV - 24 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 468 3400 6 57
 1560
 750 1440 520 125 40 1830
400 675 4500 6 60 1520 950 1690 670 160 50 2060
500 811 5630 6 61 1590 950 1680 670 160 50 2250
630 990 7100 6 62
 1590
 1100 1660 670 160 50 2310
800 1170 8000 6 64
 1650
 1100 1790 670 160 50 2810
1000 1395
 9000 6 65
 1750 1100 1910 820 160 50 3380
1250 1620
 11000 6 67
 1810 1100 1950
 820 160 50 3770
1600 1980
 13000 6 69
 1850 1100 2120
 820 160 50 4330
2000 2340
 16000 6 71 1920 1200 2230 1070 200 70 4910
2500 2790
 19000 6 73
 2130
 1200 2340 1070 200 70 6320
3150 3420
 22000 6 75
 2210 1200 2460 1070 200 70 7190

Voltage 36 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 538
 3740 6 57
 1640
 750 1730 520 125 40 2250
400 776
 4950 6 60 1700 950 1920 670 160 50 2780
500 932
 6193
 6 61 1720 950 1980 670 160 50 2950
630 1138
 7810 6 62
 1720
 1100 1990 670 160 50 3030
800 1345 8800 6 64
 1720
 1100 2120
 670 160 50 3310
1000 1604 9900 6 65
 1790 1100 2200
 820 160 50 3800
1250 1863 12100 6 67
 1910
 1100 2190
 820 160 50 4380
1600 2277
 14300 6 69
 2020
 1100 2240 820 160 50 5160
2000 2691
 17600 6 71 2050 1200 2420 1070 200 70 5690
2500 3208
 20900
 6 73
 2120 1200 2570 1070 200 70 6660
3150 3933
 24200 6 75
 2330 1200 2590 1070 200 70 8260
spacer

Voltage 7.2 kV - 12 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 820 3500 6 65 1280 750 1160 520 125 40 990
400 1150 4900 6 68 1380 950 1310 670 160 50 1330
630 1500 7300 6 70 1440 1100 1450 670 160 50 1720
800 1800 9000 6 71 1530 1100 1550 670 160 50 2120
1000 2100 10000 6 73 1600 1100 1620 820 160 50 2470
1250 2500 12000 6 75 1650 1100 1700 820 160 50 2770
1600 2800 14500 6 76 1760 1100 1790 820 160 50 3380
2000 3600 18000 6 78 1810 1200 2060 1070 200 70 4010
2500 4300 21000 6 81 1870 1200 2230 1070 200 70 4690
3150 5300 26000 6 83 2010 1200 2350 1070 200 70 5630

Voltage 17.5 kV - 24 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 880 3800 6 65 1360 750 1280 520 125 40 1110
400 1200 5500 6 68 1480 950 1380 670 160 50 1460
630 1650 7600 6 70 1630 950 1470 670 160 50 1990
800 2000 9400 6 72 1600 1100 1640 670 160 50 2240
1000 2300 11000 6 73 1680 1100 1670 820 160 50 2590
1250 2800 13000 6 75 1750 1100 1790 820 160 50 3110
1600 3100 16000 6 76 1820 1100 1950 820 160 50 3620
2000 4000 18000 6 78 1910 1200 2060 1070 200 70 4270
2500 5000 23000 6 81 2040 1200 2110 1070 200 70 5090
3150 6000 28000 6 83 2130 1200 2310 1070 200 70 6190

Voltage 36 kV

Power

(kVA)

Idling loss

(W)

Load loss

(W)

Short circuit

(%)

Noise level

(dB)

Length

A

(mm)

Width

B

(mm)

Height

C

(mm)

D

(mm)

E

(mm)

F

(mm)

Total weight

(kg)
250 1280 4000 6 67 1510 750 1470 520 125 40 1370
400 1650 5700 6 69 1560 950 1660 670 160 50 1760
630 2200 8000 6 71 1660 1100 1790 670 160 50 2330
800 2700 9600 6 72 1730 1100 1910 670 160 50 2730
1000 3100 11500 6 73 1770 1100 2030 820 160 50 3120
1250 3600 14000 6 75 1810 1100 2120 820 160 50 360
1600 4200 17000 6 76 1870 1100 2270 820 160 50 4280
2000 5000 21000 6 78 1980 1200 2380 1070 200 70 5090
2500 5800 25000 6 81 2080 1200 2470 1070 200 70 6010
3150 6700 30000 6 83 2240 1200 2480 1070 200 70 7230
spacer
*Forced cooling fans can be applied to enhance the power rating in an emergency by up 40%.

Standards and regulations

Ulusoy dry type transformer complies with

  • Climate class C1 / C2
  • Environmental class E0 / E1 / E2
  • Fire behavior class F0 / F1

 

Eaton complies with

  • ISO 9001 for quality management
  • ISO 14001 for environmental management
  • ISO 50001 for energy management
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