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Distribution Transformers
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customers worldwide manage the power needed for needed for all all
in itsits
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buildings, aircraft, trucks, cars, machinery and businesses.
buildings, aircraft, trucks, cars, machinery and businesses. With 2014
With 2018 sales
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Eaton approximately
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power more
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Eaton.com
 ULUSOY OIL IMMERSED TYPE
DISTRIBUTION TRANSFORMER

KURU TİP
12
 Eaton manufactures oil immersed type distribution transformers with a power range between 25kVA–10MVA 36kV
maximum voltage, in accordance with international standards and customer requirements. Transformers are manufactured
according to IEC 60076 standards and tests are performed in our laboratory.

Eaton designs and manufactures special transformers according to customer requirements with high technology
machinery in global standards.

STANDARDS
Ulusoy Oil Immersed Type Distribution Transformer is manufactured in accordance with the national and international standards
given below:

• TS EN
• IEC
• IEEE
• CENELEC EN
• DIN EN 50588-1

PRODUCT TYPES
• Distribution Transformer
• Solar Transformer
• Wind Turbine Transformer
• Earthing Transformer
• Dual Voltage Transformer
• Rectifier Transformer
• Start-up Transformer

P
• Auto Transformer
• Shunt Reactor
• Serial Reactors limiting the short circuit current
• Multi Winding Transformer

Rated Frequency Hz Specified according to requirement

Rated Power kVA up to 10.000kVA

Rated Voltage

MV Winding kV up to 36kV

LV Winding V Specified according to requirement

13
 PARTS
• Hermetically Sealed Transformer

1. Pressure Relief Valve

2. Hermetic Protection Relay
3. Wheels
4. HV Cable Box
5. LV Cable Box

14
• Transformer with Conservator

6. Oil Thermometer with Contact

7. Buchholz Relay
8. Magnetic Oil Level Indicator
9. Dehydrating Breather

15
 ACCESSORIES
1. Pressure Relief Valve
It is preferred in hermetic design. It protects the transformer tank in case of sudden overpressure. It is mounted to the
transformer cover and adjusted in such a way that it opens briefly in case of over pressure and compansates the pressure
inside the tank. It is optional to use it with contact.

2. Hermetic Protection Relay

It is used in hermetic design. This relay monitors the discharge of gases, the temperature and the pressure in the tank. It is
used for transformers bigger than 500 kVA power. It has 2 dry contacts for each of the discharge of gases, the tank pressure
and the temperature. It gives alert according to the adjusted limits.

3. Wheel
The wheels are transported with the transformer. They are choosen according to the strength of it and sufficiency to carry
the transformer.

4. HV Cable Box
It’s a mechanical protection to protect HV bushing terminations against environmental impacts. It can be designed in several
IP classes according to customer demands.

5. LV Cable Box
It’s a mechanical protection to protect LV bushing terminations against environmental impacts. It can be designed in several
IP classes according to customer demands.

6. Oil Thermometer with Contact

It has a maximum indicator in order to display maximum oil temperature, which can be reset by means of reset button
located on the underside of the housing. It has smooth scale up to 120 oC, two micro switches rated at 5A, 250VAC or 0.2A, 250
VDC. Dial Type Thermometer can be used if the customer wants to see the oil rising temperature without contacts.

7. Buchholz Relay
It is fitted in the connection pipe between the transformer tank and conservator tank in order to monitor and protect transformers
and other oil filled electrical equipment from faults arising internally. It gives alert in 3 conditions: faults that causes gas deposition,
sudden oil surge and oil losses.

8. Magnetic Oil Level Indicator

It is used in order to display the level of the transformer oil in conservator tank. The transformation of the oil movement to
display itself is effected by two permanent magnets which are matched to one another. If required, the level indicator with
contacts can be used.

9. Dehydrating Breather
It is a uni-directional breather, where air circulation is controlled by the liquid seal located in the breather. The size of
dehydrating breather is determined by the quantity of oil in the transformer.

16
OIL IMMERSED TYPE DISTRIBUTION TRANSFORMER
PRODUCTION TECHNOLOGY
Windings
Windings are performed with high technology Tuboly-Switzerland full automatic machinery. For the low and high
voltage coils, either copper or aluminum can be used as conductor material according to the standards or customer
requirements. Winding are seperated as LV Windings and HV Windings.

Conductor types according to voltage level and load losses:

-On LV coil: Foil (sheet) or paper insulated rectangular sectioned
-On HV coil: Enamel insulated round or paper insulated rectangular sectioned conductors are used.

The windings are made of resin coated DDP (Diamond Dotted Presspaper) and special Kraft paper resistant to high
shock and electrical withstand. The structure of this specially formed layer insulation increases the impulse voltage
properties. The layer insulation also helps in achieving another important goal: to produce a rigid coil without space.
In other words a coil of excellent quality.

Core
The core transformers are made of cold rolled grain oriented silicon steel (CRGO). The metal sheets used for
production are choosen according to their no load loss value. Cores are cut fast and without burr by modern
transformer lamination cut machine produced by Tuboly. The cores are aligned according to the project data with
step-lap method to reduce losses and noise.

Active Part
Active part is formed by the placement of the coils to core legs and alignment of the upper core. Yoke clamps and
wedges are placed to compress the coils. Cover, terminal and tap changer installations are done to make it ready for
first pre-tests. The alignment of the insulations on the cover, accessories and other equipments are done according
to the customer requirements.

Tank - Paint
Tanks are in 2 types: with radiator and corrugated walls. Tank base and top covers are made of mild steel. Corrugated
walls of front and side surfaces of the tank also forms the cooling surfaces. Front and side surfaces are made of
steel sheet in tank with radiator. Tanks are sealed with welding. Impermeality tests are also performed after the tank
manufacturing process.

Tanks are cleaned with special chemicals and dryed before painting. RAL 7033 colour code is used as top coating
paint (or with different colours as per customer requests). Inner surface of the tank is coated with special varnish.
Corrosivity categories are shown in the table below. Different transformers can be produced in requested corrosion
classes according to customer demands.

17
 Example of Typical Environments in a Temperate Climate (informative only)
Corrosivity
Category
Exterior Interior

C1 - Heated buildings with clean atmosphere, e.g offices shops, schools, hotels

C2 Atmosphere with low level of pollution. Mostly rural areas. Unheated buildings where condensation may occur, e.g. depots, sport halls

Urban and industrial atmospheres, moderate sulfur dioxide Production rooms with high humidity and some air pollution e.g. food-
C3 pollution, coastal areas with low salinity. processing plants, laundries, breweries, dairies

C4 Industrial areas and coastal areas with moderate salinity. Chemical plants, swimming pools, coastal ship and boatyards

Industrial areas with high humidity and aggresive

C5-1 atmosphere.
Buildings or areas with almost permanent condensation and with high pollution

C5-M Coastal and offshore areas with high salinity. Buildings or areas with almost pemanent condensation and with high pollution

Drying and Filling

In oil immersed type distribution transformer, the insulation materials have to be dryed before oil filling. This drying
process affects the quality of the transformer directly. Drying and filling process max. 0,1mbar vacuum with LFH (Low
Frequency Heating) and vacuum drying technology / or / drying with classical hot air. Humidity is reduced to minimum
in the oil part and in the active part of the tank by this process.

18
 TECHNICAL SPECIFICATIONS

Ecodesign EU directive No. 548/2014 (Tier 1) AL-AL.

Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level between wheels weight (kg) (kg)
A B C
(W) (W) (%) (dB) (mm) (mm) (mm) D (kg)
(mm)

25 70 900 4 37 830 610 1050 520 90 190 330

50 90 1100 4 39 830 620 1090 520 110 280 440

100 145 1750 4 41 910 650 1240 520 150 420 640

160 210 2350 4 44 990 690 1240 520 180 530 790

250 300 3250 4 47 1110 850 1240 520 240 740 1120

315 360 3900 4 49 1130 870 1300 670 260 840 1260

400 430 4600 4 50 1170 830 1490 670 290 950 1420
7,2
500 510 5500 4 51 1210 870 1520 670 320 1070 1620
-

12 630 600 6500 4 52 1270 890 1560 670 360 1260 1880

800 650 8400 6 53 1390 930 1570 820 430 1410 2160

1000 770 10500 6 55 1470 950 1680 820 520 1660 2550

1250 950 1100 6 56 1570 970 1810 820 610 2150 3200

1600 1200 14000 6 58 1590 990 1970 820 680 2310 3500

2000 1450 18000 6 60 1650 1070 2010 1000 840 2660 4260

2500 1750 22000 6 63 1930 1090 2090 1000 1040 3120 5120

3150 2200 27500 6 64 2150 1070 2210 1070 1350 4100 6540

±10 tolerance on dimensions and weight.

19
 Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level A B C between wheels weight (kg) (kg)
(W) (W) (%) (dB) (mm) (mm) (mm) D (kg)
(mm)

25 70 900 4 37 870 610 1140 520 100 200 350

50 90 1100 4 39 850 620 1220 520 120 300 470

100 145 1750 4 41 930 670 1290 520 160 440 660

160 210 2350 4 44 1050 690 1290 520 200 600 890

250 300 3250 4 47 1150 850 1350 520 250 770 1170

315 360 3900 4 49 1170 830 1390 670 280 850 1280

400 430 4600 4 50 1210 830 1590 670 310 980 1480
17,5
500 510 5500 4 51 1230 890 1620 670 340 1150 1730
-

24 630 600 6500 4 52 1290 910 1690 670 390 1350 1990

800 650 8400 6 53 1410 950 1700 820 460 1500 2290

1000 770 10500 6 55 1510 950 1780 820 530 1720 2640

1250 950 1100 6 56 1610 990 1870 820 670 2200 3310

1600 1200 14000 6 58 1730 1030 1940 820 720 2330 3580

2000 1450 18000 6 60 1850 1090 2110 1000 900 2740 4450

2500 1750 22000 6 63 1950 1110 2200 1000 1070 3180 5230

3150 2200 27500 6 64 2150 1070 2320 1070 1370 4140 6610

±10 tolerance on dimensions and weight.

Ecodesign EU directive No. 548/2014 (Tier 1) AL-AL.

Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level A B C between wheels weight (kg) (kg)
(W) (W) (%) (dB) (mm) (mm) (mm) D (kg)
(mm)

25 80 990 4,5 46 910 610 1320 520 140 220 410

50 103 1210 4,5 50 890 630 1360 520 150 290 490

100 166 1925 4,5 54 950 670 1410 520 190 390 650

160 241 2585 4,5 57 1050 730 1400 520 230 530 850

250 345 3575 4,5 60 1130 870 1460 520 290 680 1110

315 414 4290 4,5 61 1170 830 1530 670 320 790 1280

400 494 5060 4,5 63 1230 890 1730 670 370 910 1470

500 586 6050 4,5 64 1230 930 1740 670 390 1040 1670
36
630 690 7150 4,5 65 1230 970 1820 670 430 1170 1890

800 747 9240 6 66 1410 970 1830 820 510 1350 2210

1000 885 11550 6 67 1550 970 1900 820 580 1570 2570

1250 1092 12100 6 68 1630 1010 1940 820 680 1900 3040

1600 1380 15400 6 69 1810 1130 2060 820 790 2180 3580

2000 1667 19800 6 71 1810 1110 2150 1000 950 2390 4200

2500 2012 24200 6 73 1950 1150 2290 1000 1130 2890 5090

3150 2530 30250 6 75 2230 1170 2400 1070 1480 3800 6550

±10 tolerance on dimensions and weight.

20
BS-EN 464-1:2007 E0Dk Losses with IEC tolerances. AL-AL
Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level between wheels weight (kg) (kg)
A B C
(W) (W) (%) (dB) D (kg)
(mm) (mm) (mm)
(mm)

25 150 900 4 51 830 620 970 520 80 160 290

40 180 1150 4 53 910 620 960 520 100 190 340

50 190 1350 4 55 870 620 1100 520 110 210 380

63 240 1650 4 57 790 620 1110 520 100 220 380

100 320 2150 4 59 790 650 1220 520 120 270 480

160 460 3100 4 62 890 750 1140 520 150 360 630

250 650 4200 4 65 1190 810 1130 520 200 500 860
7,2
400 930 6000 4 68 1330 930 1350 670 260 670 1190
-

12 630 1300 8400 4 70 1350 910 1490 670 350 930 1630

800 1400 10500 6 71 1550 1050 1500 820 420 1000 1900

1000 1700 13000 6 73 1590 1070 1630 820 500 1210 2270

1250 2100 16000 6 74 1610 1070 1700 820 550 1370 2550

1600 2600 20000 6 76 1750 1170 1790 820 770 1630 3400

2000 3250 23750 6 78 1850 1190 1900 1000 870 1990 3970

2500 3500 32000 6 81 1870 1170 2030 1000 1000 2320 4450

3150 3600 34000 6 84 2250 1190 2120 1070 1310 3170 5860

±10 tolerance on dimensions and weight.

Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level A B C between wheels weight (kg) (kg)
(W) (W) (%) (dB) (mm) (mm) (mm) D (kg)
(mm)

25 150 900 4 51 870 620 1080 520 90 170 310

40 180 1150 4 53 930 620 1080 520 110 200 360

50 190 1350 4 55 910 620 1210 520 120 220 410

63 240 1650 4 57 810 620 1230 520 110 230 400

100 320 2150 4 59 830 710 1280 520 130 290 510

160 460 3100 4 62 930 770 1230 520 170 390 670

250 650 4200 4 65 1110 810 1270 520 210 520 900
17,5
400 930 6000 4 68 1310 910 1490 670 270 680 1210
-
630 1300 8400 4 70 1370 870 1600 670 360 940 1630
24
800 1400 10500 6 71 1550 1030 1600 820 440 1030 1920

1000 1700 13000 6 73 1550 1050 1730 820 520 1230 2270

1250 2100 16000 6 74 1590 1090 1800 820 570 1410 2580

1600 2600 20000 6 76 1750 1150 1900 820 780 1670 3380

2000 3250 23750 6 78 1870 1190 1990 1000 880 2010 3960

2500 3500 32000 6 81 1870 1190 2130 1000 1010 2340 4480

3150 3600 34000 6 84 2270 1190 2220 1070 1350 3220 5960

±10 tolerance on dimensions and weight.

21
 BS-EN 464-1:2007 C0Ck Losses with IEC tolerances. AL-AL
Voltage Power No Load Load Losses Short Circuit Sound Length Width Height Distance Oil Active part Total Weight
(kV) (kVA) Losses 120 Impedance Level A B C between wheels weight (kg) (kg)
(W) (W) (%) (dB) (mm) (mm) (mm) D (kg)
(mm)

25 165 990 4,5 48 970 620 1220 520 140 200 390

40 207 1265 4,5 50 990 630 1240 520 150 220 430

50 230 1450 4,5 52 950 620 1330 520 160 240 460

63 269 1684 4,5 54 850 620 1420 520 150 250 460

100 380 2350 4,5 56 890 750 1420 520 180 310 580

160 520 3350 4,5 59 990 810 1390 520 210 410 740

250 780 4250 4,5 62 1130 850 1410 520 270 550 990

400 1120 6200 4,5 65 1250 890 1630 670 330 720 1290
36
630 1450 8800 4,5 67 1250 910 1740 670 410 1000 1710

800 1700 10500 6 68 1470 990 1760 820 490 1110 2030

1000 2000 13000 6 68 1610 1070 1860 820 590 1330 2450

1250 2400 16000 6 70 1590 1050 1930 820 640 1530 2720

1600 2800 19200 6 71 1730 1130 2030 820 830 1780 3490

2000 3400 24000 6 73 1890 1170 2120 1000 970 2190 4170

2500 4100 29400 6 76 1930 1230 2220 1000 1140 2410 4720

3150 4500 32000 6 80 2250 1230 2390 1070 1480 3330 6240

±10 tolerance on dimensions and weight.

22
TESTS
Routine Tests
• Measurement of winding resistance
• Measurement of voltage ratio and verification of phase displacement
• Measurement of short circuit impedance and load losses
• Measurement of no load current and no load losses
• Dielectric routine test
• Test of on-load tap changers
• Insulation resistance

Type Tests
• Temperature rise test
• Lightning impulse test
• Measurement of sound level

Special Tests
• Determination capacitances windings-to-earth and between windings
• Measurement of zero-sequence impedance on three phase transformers
• Short-circuit withstand test (performed at KEMA)
• Measurement of noise level
• Measurement of the harmonic of the no load current
• Measurement of insulation resistance to earth of windings and/or measurement of dissipation factor of the
insulation system capacitances

23
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