20kV Oil-immersed distribution transformer
Nov 10, 2025
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S13 series fully sealed oil-immersed transformers are applicable to power systems with an ac 50Hz and rated working voltage of 20kV and below,as distribution transformers for petroleum,metallurgy,chemical industry,textile,light industry and other enterprises and places with large dust.
20kV Oil-immersed distribution transformer Key characteristics
Voltage conversion: Reduces 20kV or higher voltage to lower voltages suitable for consumers.
Efficiency: Engineered for high efficiency and low loss, saving on running costs.
Cooling and insulation: Uses insulating oil to cool the windings and dissipate heat, a process crucial for maintaining performance and reducing energy wastage.
Robust construction: Built with a corrosion-resistant tank and durable materials to ensure a long service life, even in demanding environments.
Protective features: Equipped with safety functions such as temperature, gas, and pressure protection, as well as a pressure relief valve.
Environmental suitability: The fully sealed design allows it to operate reliably in humid and dusty outdoor environments.
Applications: Widely used in urban and rural power grids for residential, commercial, and industrial distribution.
20kV Oil-filled transformer Specification
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Rated capacity (kVA |
Voltage combinationand tap range |
Vector group symbo |
Non-load loss (VV |
Load loss (W) |
No-load current (%) |
Short circuit imp edance (%) |
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High pressure (kV) |
High pressure tap range (%) |
Low pressure (kV) |
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50 |
20 22 24 |
±5 ±2×2.5% |
0.4 |
Dyn11 Yyn0 |
170 |
1270/1210 |
2.00 |
6.5 |
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100 |
230 |
2120/2020 |
1.80 |
6.5 |
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25 |
270 |
2500/2380 |
1.70 |
6.5 | ||||
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160 |
290 |
2970/2830 |
1.60 |
6.5 |
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200 |
340 |
3500/3330 |
1.50 |
6.5 |
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250 |
410 |
4160/3960 |
1.40 |
6.5 |
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315 |
490 |
5010/4770 |
1.40 |
6.5 |
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100 |
580 |
6050/5760 |
1.30 |
6.5 | ||||
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500 |
690 |
7280/6930 |
1.20 |
6.5 | ||||
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630 |
830 |
8280 |
1.10 |
6.5 |
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800 |
980 |
9900 |
1.00 |
6.5 |
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000 |
1150 |
12150 |
1.00 |
6.5 |
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25( |
1410 |
14670 |
0.90 |
6.5 |
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1600 |
1700 |
17550 |
0.80 |
6.5 |
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Note:
1.slash the top of table load loss applicable to Dyn11 join groups,load loss slash Yyn0 below values apply to join the group.
2.other capacity product performance parameters,determined by the user in corsultation with the manufacturer.
Maintaining Oil Immersed Transformers
Routine maintenance is essential for keeping these units in optimal condition:
Oil Testing
Monitor for contaminants, moisture, and acidity regularly.
Cooling System
Inspect radiators, fans, and pumps to prevent overheating.
Winding Resistance Check
Regular resistance tests can detect early signs of wear.
Bushing Inspection
Ensure bushings are intact to avoid electrical discharge.
Choosing the Right Transformer for Your Needs
Oil immersed transformers offer unparalleled efficiency, cost-effectiveness, and reliability. They are ideal for outdoor, high-voltage industrial settings. However, if your application requires minimal environmental impact or a strictly indoor setup, a dry-type transformer may be better suited.
For expert recommendations tailored to your specific requirements, consult us to ensure you select the right transformer for your business.
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.
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types of transformer from GNEE
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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