33MVA 44MVA 55MVA Oil-immersed Power Transformer
Primary Voltage Ratings: 138kV/34.5kV; 69kV/34.5kV
Secondary Voltage Ratings: 13.8kV
BIL: 500/200/125kV; 350/200/125kV
Standards: IEEE/ANSI/NEMA
Power Rating: 33MVA, 44MVA, 55MVA
Have questions? GNEE sales representatives are available for live chat now
Send E-mail: sales@gneeelectric.com
Tel: +8615824687445
introduction of 33/44/55 MVA power transformer
GNEE TRANSFORMER supplies 33/44/55 MVA oil filled power transformer.
The 33/44/55 MVA 3‑Phase Power Transformer features a three-phase, three-winding, oil-immersed design with a conservator. They offer capacities of 33 MVA (self-cooled), 44 MVA (Stage 1 cooling fan), and 55 MVA (Stage 2 cooling fan). Constructed with copper windings and high-quality silicon steel, they use ASTM D3487-compliant mineral oil. Equipped with various accessories and tested per IEEE standards.
Oil-immersed Power Transformer Applications
- Solar EPC Projects
Steps up photovoltaic array voltage for transmission-level interconnection.
- Utility Transmission Substations
Facilitates grid-level voltage control and feed-in from multiple sources.
- Battery Energy Storage Systems
Integrates large-capacity BESS installations into medium-voltage networks.
- Critical Infrastructure Power
Provides dependable medium-voltage supply to data centers, hospitals, and industrial complexes.
33MVA 44MVA 55MVA Oil-immersed Power Transformer Specifications
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Capacity (ONAN/ONAF1/ONAF2) |
33 MVA / 44 MVA / 55 MVA |
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Primary Voltages |
138/34.5 kV or 69/34.5 kV |
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Secondary Voltage |
13.8 kV |
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Vector Group |
Dyn11 |
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Tap Changer Range |
±8.4 % to +7.2 % (8 steps) |
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Cooling Method |
ONAN, ONAF1, ONAF2 |
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Impedance |
10 % |
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Lightning Impulse Withstand (Full) |
HV: 500 kV; MV: 200 kV; LV: 125 kV |
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Ambient Conditions |
–20 °F to +110 °F; 100 mph wind; 0.5 in ice |
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Insulation Oil |
ASTM D3487 mineral oil |
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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Demander |
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Demander: |
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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
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