250kVA Step-Down Oil Immersed Distribution Transformer
Nov 03, 2025
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Oil immersed transformers use insulating oil as the cooling medium, and the iron core and winding are immersed in a sealed oil tank to dissipate heat through oil circulation. Its voltage level covers a wide range, from distribution to ultra-high voltage, with strong overload capacity and stable insulation performance. The corrugated fuel tank design enhances heat dissipation efficiency and is equipped with protective devices such as gas relays, ensuring high safety. Suitable for scenarios such as power grid substations and industrial distribution, especially in high-capacity and high-voltage scenarios, it has significant advantages and is one of the core equipment for power transmission and distribution.
- 10kV oil immersed sealed distribution transformer
This product adopts a fully sealed corrugated oil tank structure, and the transformer oil does not come into contact with the surrounding air, so the transformer oil will not absorb external moisture, thus not reducing the insulation strength. In addition, due to the inability of oxygen to enter the fuel tank, the aging of insulation materials is avoided, which improves the service life of the product and also enhances social benefits.
- 35kV oil immersed on load tap changer power transformer
The stacking method of the iron chips in this product is staged, which changes the traditional iron core stacking process and improves the magnetic circuit distribution inside the iron core. The no-load loss, no-load current, and noise are reduced by 20% and 10% respectively compared to traditional stacked iron core transformers.
Oil Filled Transformer Product Paramenters
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Rated capacity |
Voltage combination |
Connection group symbol |
No-load loss(W) |
Load loss |
No-load current % |
Short-circuit impedance % |
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H.V.(kV) |
High pressure tapping |
L.V.(kV) |
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30 |
6 |
±2x2.5 |
0.4 |
Dyn11 |
65 |
455/430 |
1.5 |
4.0 |
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50 |
80 |
655/625 |
1.3 |
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63 |
90 |
785/745 |
1.2 |
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80 |
105 |
945/900 |
1.2 |
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100 |
120 |
1140/1080 |
1.1 |
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125 |
135 |
1360/1295 |
1.1 |
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160 |
160 |
1665/1585 |
1.0 |
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200 |
190 |
1970/1870 |
1.0 |
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250 |
230 |
2300/2195 |
0.9 |
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315 |
270 |
2760/2630 |
0.9 |
|||||
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400 |
330 |
3250/3095 |
0.8 |
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500 |
385 |
3900/3710 |
0.8 |
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630 |
Dyn11 |
460 |
4460 |
0.6 |
4.5 |
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800 |
560 |
5400 |
0.6 |
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1000 |
665 |
7415 |
0.6 |
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1250 |
780 |
8640 |
0.5 |
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1600 |
940 |
10440 |
0.5 |
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2000 |
1085 |
13180 |
0.4 |
5 |
||||
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2500 |
1280 |
13360 |
0.4 |
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Rated capacity |
Voltage combination |
Connection group symbol |
No-load loss(W) |
Load loss |
No-load current % |
Short-circuit impedance % |
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|
H.V.(kV) |
High pressure tapping |
L.V.(kV) |
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3150 |
35-38.5 |
±2x2.5 |
3.15 |
Yd11 |
2.4 |
21.9 |
0.45 |
7 |
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4000 |
2.9 |
25.9 |
0.45 |
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5000 |
3.5 |
29.7 |
0.45 |
|||||
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6300 |
4.2 |
33.3 |
0.45 |
8 |
||||
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8000 |
35-38.5 |
±2x2.5 |
3.15 |
YNd11 |
5.8 |
36.5 |
0.35 |
|
|
10000 |
7.0 |
43.0 |
0.35 |
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12500 |
8.0 |
51.1 |
0.30 |
|||||
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16000 |
9.7 |
62.5 |
0.30 |
|||||
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20000 |
11.5 |
75.5 |
0.30 |
|||||
|
25000 |
13.6 |
89.3 |
0.25 |
10 |
||||
company profile
GNEE TRANSFORMER has strong production capacity and an efficient marketing team.
Our transformer products include 500kV, 400kV, 330kV, 220kV, and 110kV ultra-high voltage transformers, various dry-type transformers/oil immersed transformers/amorphous alloy transformers of 35kV and below, new energy transformers, and prefabricated substations,
Export series: single-phase transformer, three-phase transformer, cylindrical transformer, isolation transformer, control transformer, voltage regulator and other products, And various specifications of special transformers such as grounding transformers, arc suppression coils, Bitcoin transformers, prefabricated cabins, reactors, electric furnace transformers, rectifier transformers, mining transformers, marine transformers, etc.
GNEE TRANSFORMER has successively passed ISO9001, ISO14001, ISO45001, SA8000 system certification. At the same time, 10kV and 35KV level distribution transformers and box type substations have obtained interna- tional Electrotechnical Commission IEC certification, US UL certification, German TUV certification, EU CE certification, Dutch KEMA certification, and GOST certification. Our product sales cover the global market, including 72 countries and regions such as the United States, Europe, Canada, Mexico, etc.
transformer Workshop equipment display
types of transformer from GNEE
Get Transformer Order specification
GNEE Transformer Order specification
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When choosing our company's products, please provide the following data to better serve you. |
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Demander |
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Demander: |
Telephonemethods: |
Fax: |
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Project technical leader: |
Telephonemethods: |
Mailbox: |
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Transformer type selection |
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□Dry transformer {□SC(B) Epoxy resin □SC(B) Non-encapsulated} □American Box(ZGS) {□Terminal type(-Z-) □Ring network type(-H-)} □European Box change(YBM){□ Dry change □Oil change} |
□ Oil-immersed transformer{□ Fully sealed(-M-) □Oil-bearing pillow} □Amorphous alloy transformer{□Dry amorphous □ Oil amorphous} □ Special transformer{Rectifier, Furnace, Mine, Etc} |
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Transformer basic data selection
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Country of use: |
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Phase number: |
□Three-phase(S conventional) □ Monophase □Other( ) |
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Frequency: |
□50Hz(conventional) □60Hz □ Other( ) |
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Transformer oil: |
□#25(conventional) □#45(minimum temperature below-25℃) |
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Rated capacity: |
□( )kVA Conditions of use □Outdoor type □Indoor type |
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Altitude: |
□Less than 1000m(conventional) □1000-2000m □3000m以上 over |
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Rated voltage(High voltage) |
□6kV □10kV □20kV □35kV □66kV □110kV □220kV □Other( ) |
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Rated voltage(Low pressure) |
□0.4kV □0.66kV □10kV □10.5kV □35kV □其他 Other( ) |
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Connected group |
□Dyn11(conventional) □Yyn0 □YNd11 □li0(Single-phase) □Other( ) |
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Impedance(%): |
□4% □4.5% □5.5% □6% □6.5% □7.5% □8% □Other( ) |
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Voltage regulation mode |
□Voltage regulation without excitation(conventional) □On-load voltage regulation(Z) |
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Voltage regulation range |
□±2*2.5% □±5% □±3*2.5% □Other( ) |
Transformer accessory selection
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□Fan □Temperature control{□ Common □With 485 computer interface} □Dry case{□ Ordinary steel sheet □Aluminum alloy » Stainless steel} □Protection level of dry case(□IP20(Conventional) □IP( )} □Dry case height requirements{□None □Requirements[ ]} □ Cable out mode of the dry variable shell {□ Up-and-out □ Up-and-down □Down-in/DOWN-out □Down-in/UP-out □Down-in/DOWN-out □Down-in/ side-out [□Left □ Right-out]} |
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Note: 1. (Dry change requirements s 100kVA transformer does not include fans, such as fans, need to be charged 2. (Oil changes <630kVA transformer does not include temperature control, gas relay, if necessary, need to increase the fee) |
Other special requirements(additional charges apply below)
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Dry transformer |
□Shell and bottom plate{□Ordinary □Fully sealed} □Travel switch □Magnetic lo □Zero sequence transformer □Copper bar to the low voltage cabinet □Protective mesh □Lighting □100kVA or less Fan □Shock absorber |
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Oil-immersed transformer |
□No.45 oil for non-low temperature areas □Designated brand on-load voltage regulator □400kVA and below low voltage outlet OABC phase with wiring terminals □630kVA or below requires temperature control □800kVA or below Low voltage outlet phase 0 requires wiring terminals □630kVA and below must be equipped with gas relay |
GNEE TRANSFORMER Industrial Layout
Asia:China, Philippines, Cambodia, Malaysia, Myanmar, Indonesia, Vietnam, Mongolia, Japan, Taiwan Province, Bangladesh, Sri Lanka, Lebanon, Saudi Arabia, Turkey, Armenia, Iraq, Iran, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan
Africa:Egypt, Ethiopia, Angola, Botswana, Burundi, Cape Verde, Congo, Guinea, Ghana, Gabon, Zimbabwe, Cameroon, Kenya, Rwanda, Malawi, Mauritius, Mauritania, Mozambique, South Africa, Nigeria, Somalia, Chad, Central Africa
North America: Aruba, Panama, Dominican Republic, Costa Rica, Honduras, Caribbean region,Canada, United States, Mexico, El Salvador, Guatemala, Jamaica
Europe: Bulgaria, North Macedonia, Finland, Norway, Ukraine, Greece, Hungary, Italy, United Kingdom
South America: Argentina, Paraguay, Ecuador, Colombia, Guyana, Venezuela, Uruguay, Chile
Middle East: The Middle East region
Oceania: Australia, Papua New Guinea. Fiji