Three Phase 1250 KVA Oil Immersed Transformer
Nov 06, 2025
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Overview of Three Phase 1250 KVA Oil Immersed Transformer
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1250 kVA Transformer Rated Voltage: Primary & Secondary Windings
Voltage compatibility is non-negotiable for seamless transformer operation, and the 1250 kVA Transformer is engineered to fit global and regional grid standards. Its design prioritizes flexibility, making it suitable for diverse applications:
Primary Winding Voltage: The transformer supports two common high-voltage inputs: 11kV or 33kV. This versatility means it can integrate with medium-voltage grids (used in industrial zones, suburban power networks, and commercial hubs) without additional modifications.
Secondary Winding Voltage: On the low-voltage side, it delivers a consistent 415V output-ideal for powering machinery, lighting, HVAC systems, and other low-voltage equipment in factories, warehouses, or multi-story buildings.
This voltage configuration eliminates the need for extra step-up/step-down components, simplifying your electrical setup and reducing potential points of failure.
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1250 kVA Transformer Current Rating: Optimized for 50Hz/60Hz Grids
Current capacity directly impacts a transformer's ability to handle load demands, and the 1250 kVA Transformer is rated for peak performance across global frequency standards:
Rated Current: At its core, the 1250 kVA transformer delivers a maximum current of 1574A-enough to power heavy-duty industrial machinery (e.g., motors, compressors) or support high-density commercial loads (e.g., data centers, shopping malls) without overheating.
Frequency Compatibility: It operates seamlessly at either 50Hz or 60Hz, the two most common grid frequencies worldwide. This makes it a versatile choice for projects in regions like Europe, Asia (50Hz) or North America (60Hz), eliminating the need for frequency-specific models.
With this current and frequency range, the transformer maintains stable power delivery even during moderate load fluctuations.
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1250 kVA Transformer Efficiency: Balancing Performance & Energy Savings
Efficiency is a top priority for reducing operational costs and meeting sustainability goals-and the 1250 kVA Transformer excels here:
Efficiency Range: Typically, it achieves an efficiency of 95% to 98%, depending on the load. At full load, efficiency peaks (often near 98%), while partial loads (e.g., 50-75% capacity) still maintain 95%+ efficiency-far above the minimum standards for most industrial transformers.
Why Efficiency Matters: A 95-98% efficiency rating translates to less energy waste (in the form of heat), lower electricity bills, and a smaller carbon footprint. For facilities running 24/7, this can result in significant long-term savings.
The transformer's efficiency is further enhanced by high-quality core materials (e.g., grain-oriented silicon steel) and optimized winding designs, ensuring it performs reliably for decades.
Why Choose a 1250 KVA Oil Immersed Transformer?
The 1250 kVA Transformer stands out for its blend of flexibility, power, and efficiency. It's the go-to choice for:
- Industrial facilities (manufacturing plants, refineries) needing to power heavy machinery.
- Commercial complexes (malls, hotels, office towers) with high-density electrical demands.
- Municipal or utility projects (substation upgrades, residential area 配电) requiring medium-to-low voltage conversion.
When selecting a 1250 kVA transformer, always prioritize models that meet international standards (e.g., IEC, ANSI) to ensure safety, durability, and compliance with local electrical codes.
Whether you're evaluating specifications or planning a purchase, the 1250 kVA Transformer delivers the performance and reliability needed to keep your operations running smoothly. For customized solutions or further questions about its application, reach out to a trusted electrical equipment provider today.
Advantages of Three Phase Oil Filled Transformer
Flexible standard adaptation: Supports international standards such as GB, IEC, and UL, with customization available based on customer requirements;
Multi-national authoritative certifications: Certified by ISO, CE, UL, etc., ensuring reliable quality;
High efficiency: Exceeds 99% efficiency, complying with the European Tier 2 energy efficiency regulation (2015/2014/548/EC) for excellent energy savings;
Maintenance-free operation: Features IP65 protection class for dust and moisture resistance, with a design life of over 25 years for hassle-free use;
Environmental friendliness: Optional FR3 vegetable oil, meeting environmental protection and sustainable development needs;
Strong overload capacity: Copper coil design allows short-term overload up to 150% of rated capacity (maximum 2 hours), with only oil temperature monitoring required (≤95℃).
1250 kVA Oil Filled Transformer Technical Parameters
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DESCRIPTION |
RATINGS |
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Rated Power |
1250 kVA |
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Cooling Method |
ONAN |
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Vector Group |
Dyn11 |
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Rated frequency |
50 Hz |
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Rated Primary Voltage (Uo) |
33 kV rms |
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Insulation voltages (Primary Side) Rated Voltage (Ur) Power frequency withstand (Up) for 1minute Impulse Withstand Voltage (Ud) |
≥36kV rms ≥70kV rms ≥ 170kV peak |
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Off-circuit Tap Changer Tap steps Tap Positions |
5 steps 2.5% taps -5%, -2.5%, 0, +2.5%, +5% |
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Secondary voltage at no load: Between phases: Phase to neutral: |
400 V rms 230 V rms |
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Secondary Insulation Level |
1000 V rms |
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Transformer losses No-load Loss Full Load loss |
≤1825W ≤12430W |
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1250 kVA Transformer Full Load Current |
1574A |
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Full load efficiency (@100% load, 0.8PF) |
≥ 98.5% |
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Voltage regulation |
≥ 4.75% |
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1250 kVA Transformer Impedance Voltage |
6.5 % |
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Site Altitude |
2000 m |
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HV winding Insulation class LV winding insulation class |
A (105 °C) A (105 °C) |
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Temperature rise Windings Oil Top |
60 °C 55 °C |
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1250 kVA Transformer Dimensions Overall Length Overall Width Overall Height |
≤ 2100 mm ≤ 1300 mm ≤ 2500 mm |
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1250 kVA Transformer Oil Capacity |
550kg |
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1250 kVA Transformer Weight |
≤4500 kg |
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, Pakistan, Indonesia, Vietnam, Mongolia, Japan, Taiwan Province, Bangladesh, Sri Lanka, Lebanon, Saudi Arabia, Turkey, Armenia, Saudi Arabia, Saudi Arabia, 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, Mexico, Uruguay, Chile
Middle East: The Middle East region
Oceania: Australia, Papua New Guinea. Fiji