250kVA S11 oil-immersed transformer
Nov 03, 2025
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An oil-immersed distribution transformer uses insulating mineral oil for cooling and insulation.
The oil not only helps dissipate heat from the windings and core but also improves dielectric strength, ensuring long service life and reliable performance.
They are widely used in industrial facilities, substations, and utility power distribution networks.
Key Advantages of GNEE Oil-Immersed Transformers
- High-quality silicon steel core for reduced no-load loss
- Excellent heat dissipation and insulation reliability
- Low noise operation and compact structure
- Energy-efficient design compliant with IEC 60076
- Customizable voltage levels (6kV–35kV)
- Factory-direct price and global technical support
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S11/13/20/22 Oil-immersed power transformer |
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Capacity (KVA) |
Voltage Ratio |
Vector Group |
LWA |
No Load Loss (W) |
Load Loss At 75℃ (W) |
No Load Current (%) |
Impedance 75℃ (%) |
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High Voltage (KV) |
HV Tapping % |
Low Voltage (KV) |
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100 |
6 |
±2×2.5% or +3/-1×2.5% |
0.4 |
Dyn11 |
52 |
75 |
1500 |
1 |
4 |
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125 |
54 |
85 |
1800 |
0.9 |
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160 |
100 |
2200 |
0.7 |
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200 |
56 |
120 |
2600 |
0.7 |
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250 |
140 |
3050 |
0.7 |
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315 |
58 |
170 |
3650 |
0.7 |
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400 |
200 |
4300 |
0.5 |
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500 |
60 |
240 |
5150 |
0.5 |
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630 |
320 |
6200 |
0.3 |
4.5 |
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800 |
62 |
380 |
7500 |
0.3 |
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1000 |
450 |
10300 |
0.3 |
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1250 |
65 |
530 |
12000 |
0.2 |
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1600 |
630 |
14500 |
0.2 |
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2000 |
67 |
750 |
17400 |
0.2 |
5 |
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2500 |
900 |
20200 |
0.2 |
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Oil-Immersed Transformers Application Scenarios
Oil-immersed distribution transformers are used in a wide range of applications.
They are preferred in environments where high insulation, strong cooling capability, and stable voltage regulation are required.
Below are typical application areas:
- Industrial Plants: For machinery, motors, and production lines requiring steady voltage supply.
- Utility Substations: Used by power companies for medium-voltage power distribution networks.
- Renewable Energy Projects: In solar and wind farms to step up or step down voltage between generation and grid connection.
- Urban and Rural Power Grids: For municipal lighting, commercial buildings, and residential communities.
- Mining and Oil Fields: Designed to withstand harsh environmental conditions and heavy loads.
- Railway and Transportation Systems: To ensure stable power supply for signaling and traction systems.
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