China Distribution Transformer Manufacturer
Jinan Omek Electric Power Co., Ltd. (OMEK Power), a professional distribution transformer supplier, located in the Spring City of China.
✅ Our transformers can fulfill your requirements on low, medium or high voltages, production materials and unique designs, etc.
✅ All of OMEK’s transformers, both power and distribution types, meet our domestic and international standards, including the IEC series, ANSI/IEEE, IS, etc.
✅ We have our own Doctoral Innovation Workstation supporting the more stringent needs of our clients.
✅ Indonesia branch: Provides on-site technical coordination, adapting to the PLN power grid in Indonesia.
✅ Assembly plants in Ethiopia: Greatly promotes African power transmission and distribution.
OMEK Power – manufactures the perfect distribution transformer as you expected!
Our Distribution Transformer Specifications
OMEK supplies dry type, oil immersed, pole mounted, pad mounted distribution transformers and compact substations for electricity distribution. Designs vary on cooling methods, installation methods and applications. General specifications for all of our distribution transformers are outlined below for your reference.
- Rating
- Voltages
- Other specifications
🔵 Max rated capacity: up to 10 MVA (Can be customized)
🔵 OMEK™ TOP 9 best-selling rating models in the year of 2025:
✅ 25 kva distribution transformer, 50 kva distribution transformer, 100 kva distribution transformer, 200 kva distribution transformer
✅ 500 kva distribution transformer, 1000 kva transformer, 1250 kva transformer
✅ 2000 kva transformer, 2500 kva transformer
OMEK friendly reminder: Remember to choose the closest standard rating meets or a little bit beyond your actual load.
Common voltages we make:
🔵 Primary voltages: 6kV, 6.3kV, 6.6kV, 10kV, 10.5kV, 11kV, 33kV, 40kV, etc.
🔵 Secondary voltages: 400V (Specific requirements can be customized)
🔵 Dual voltages can also be made to provide you a back up in dealing with a future voltage change.
🔵 Impedance voltage (%):
▪️For kVA ratings from 30 kVA – 500 kVA: 4%
▪️For kVA ratings from 630 kVA – 1600 kVA: 4.5%
▪️For kVA ratings from 2000 kVA – 2500 kVA: 5%
🔵 Tap range: ±2×2.5, ±5
🔵 Connected group label: Dyn11, Yzn11, Yyn0
OMEK™ Distribution Transformer Types
As a global transformer leader, OMEK has the widest distribution transformer varieties, available in all cooling types, kVA ratings, energy efficiency Tiers, and other special designs. Your requirements, we fulfil them! Your challenge, our solution!
Select a Transformer for Your Environment
Oil type transformer
We use mineral oil or high flash point insulating oil as the insulation material and cooling method. It can cool down naturally (ONAN) or can be designed with a fan (ONAF). Very suitable for outdoors.
Dry type transformer
It adopts epoxy resin technique. It is fire-resistant and non-explosive, so very suitable for indoor use. Basically, maintenance is free, and environment friendly. Its cooling method is AN/AF.
Choose Your Installation Type
Pole mounted distribution transformer
Both single phase and 3 phase can be designed by OMEK. Installed on a pole, also known as a pole distribution transformer.
Pad mounted distribution transformer
A kind of outdoor distribution transformer. More safer, small space, low noise, beautiful, prevent theft and broken
1-Phase | 3-Phase
Single phase distribution transformer
The common type OMEK makes is single phase pole mounted distribution transformer with oil immersed. With an annual production 15,000 units.
Three phase distribution transformer
OMEK 3 phase distribution transformers can be customized to meet your specific requirements on installation and power supply capabilities, etc.
Select a High Efficiency Distribution Transformer
Amorphous alloy core distribution transformer
That’s OMEK’s most representative product. We initiated the formulation of its standard NB/T 10483-2020 in China.
3D wound core distribution transformer
Perfect match with 3 phase transformer. Its core is seamless and continuously wound. Smoother magnetic field leads to super power saving.
High performance silicon steel transformer
Uses laminated silicon steel sheets as the core material. Features higher magnetic permeability, lower iron loss, and longer service life.
Find Your Appropriate kVA Rating
Distribution Transformer Manufacturing Process
As a global leader and supplier in transformer industry, OMEK Power’s pursuit for high quality distribution transformer products permeated in each process of the manufacturing.
- In-coming raw materials
We adopts elimination mechanism on our suppliers. We select the top high-end raw materials on the basis of various testings.
Core processingEquipped with advanced precision slitting, CNC core rolling machines, etc. Iron core shearing burrs is controlled less than 0.02mm.
- Coil winding
We achieved AI processing systems to ensure precision. Our technical team with more than 10 years of experience supervises the whole process to provide rigorous dual control.
Epoxy cast resin vacuum pouring (dry type)The final glossy, clean, smooth coil is made with precisely compounds ratio in a sealed, climate-controlled workshop.
- Assembly process
OMEK uses a laser positioning system to ensure the concentricity deviation within ±1mm. All leads are welded via argon arc welding, ensuring long term reliability.
Pre-delivery inspectionWe carry out routine testings, type tests and special tests. We welcome you to join each test on site. Detailed test reports will be delivered to you along with the order.
OMEK Distribution Transformer: Design for Harsh Environment
For special environments, such as high temperature and humidity, OMEK employs multiple techniques to reduce the transformer oil and windings’ temperature rise.
This enables distribution transformers to operate stably for a long time, extending their lifespan and reducing power outages and project losses.
Distribution Transformer Key Components
What makes our distribution transformers reliable? They are our premium components!
Buying OMEK transformers is not a one-time deal. We are more concerned about your actual operation and maintenance. OMEK provides long term spare parts support. Our standardized components make your future replacement easier and faster!
Protection Devices from OMEK
To ensure a safe and stable operation of our distribution type transformers, we design and install a series of electrical protection solutions and equipment, to provide maximum safeguard for you and the power grid.
For a dry type
Temperature controller
Fuse
Cooling fan control
Arc light protection (optional)
Lightning arrester
For an oil filled type
Gas relay
Pressure relief valve
Oil level gauge
Pressure sudden change relay (optional)
High-voltage side fuse
Why OMEK Power?
For each order, we conduct full-batch random inspection of raw materials. Our automated production workshops make precision!
OMEK provides custom voltages, vector groups, and supports both 50Hz/60Hz grid frequencies. Fully comply with local tap changer requirements.
OMEK successfully passed the ISO series certification, 3C and PCCC energy-saving transformer certification, as well as CE, ASTA these international certifications.
Our distribution transformers deal easily with voltage fluctuations. We customized specifications to stably adapt to the new energy system.
OMEK conducts necessary routine and type tests. We also provide FAT vedio, third-party testing, on-site witness test for you, please rest assured.
OMEK owns several branches, provides localized technical support, spare parts supply etc. through its global service network.
We provides complete documents & standardized delivery processes. GA drawings, FAT reports, efficiently cooperates with your project completion.
China OMEK transformers are more cost-effective, with superior quality. They can greatly reduce your initial investment. Help your project achieve faster ROI!
Global Grid Compliance & Custom Engineering
All OMEK distribution transformers are 100% custom-engineered based on your exact local utility grid codes, project specifications, and unique regional environmental conditions.
| Target Region | Standard Voltages & Frequency | Grid Codes & Certified Standards | Engineering Customization Options |
|---|---|---|---|
| Southeast Asia (Indonesia Focus) | 6.6kV, 11kV, 20kV to 380V/400V Standard Ratings: 25kVA – 2500kVA 50Hz / 60Hz | IEC 60076 / SPLN Compliant PLN (Indonesia) CE & ISO 9001 Certified | • High-Humidity Anti-Corrosion Design • Custom PLN Impedance & Loss Matching • Flexible Delivery for Major Industrial Parks |
| East Africa (Ethiopia Factory Hub) | 15kV, 33kV to 380V/400V 50Hz | IEC 60076 / EEU Standards East African Grid Codes ISO 9001 Quality System | • Local Factory Supply (Ethiopia Hub) • Fast-Track Project Logistics & Delivery • Tariff-Optimized Regional Solutions |
| South Africa 🇿🇦 | 11kV, 22kV, 33kV to 400V/415V 50Hz | SANS 780 Standard Eskom Grid Codes SABS Standards Compliant | • Anti-Loadshedding Grid Shock Protection • Reinforced Winding Mechanical Strength • Custom Transient Surge Resilience |
| Other African Regions | 11kV, 33kV to 400V/415V 50Hz | IEC 60076 / CE Certified BS 171 / SONCAP / KPLC | • Extreme Heat & Desert UV Protection • Hermetically Sealed Maintenance-Free Tank • Anti-Dust Accumulation Configurations |
| Latin America (LATAM) | 10kV, 13.8kV, 22.9kV to 220V/380V 50Hz / 60Hz | IEC 60076 / RETIE Approved ABNT (Brazil) / CODELCO | • High-Altitude Adaptability (>3,000m) • Expanded Cooling Surface/Radiator Calculations • Specialized Clearance Distances for Mining |
| Middle East & Central Asia | 11kV, 13.8kV, 33kV to 380V/400V 50Hz / 60Hz | IEC 60076 / Laboratory Compliant SEC (Saudi Arabia) / GOST Standard | • 55°C Ambient High-Temperature Rating • Sand-Proof Terminal Boxes & Control Cabinets • Factory Type & Routine Test Reports Ready |
| North America (USA & Canada) | 12.47kV, 13.2kV, 13.8kV, 34.5kV to 208V/480V 60Hz | ANSI / IEEE C57 Compliant NEMA Standards / CSA Certified | • Pad-Mounted & Dead-Front Configurations • Tamper-Proof Underground Loop Cabinets • Standardized American Voltage Vectors |
Local Manufacturing Support & Global Assurance
🇮🇩 Office & Service Engineers in Indonesia
Backed by our dedicated office and local service engineers in Indonesia. We provide instant on-site technical support, Site Acceptance Testing (SAT), and 24-hour emergency engineering response for local utilities and industrial zones.
🇪🇹 Assembly Plant & Support in Ethiopia
Leverage our fully operational local assembly factory in Ethiopia. We provide localized supply, rapid stock availability, localized spare parts, and immediate field engineering teams for East African infrastructure projects.
🌐 Global High-Safety & Expert Technical Support
Our transformers undergo 100% strict factory routine testing and specialized safety audits to ensure zero-defect grid integration. For South Africa, LATAM, and the Middle East, we guarantee lifetime 24/7 expert remote technical guidance and detailed engineering drawings for smooth local clearance and installation.
Verify Your Grid Standards Now
Are you struggling to select the right distribution transformer for your usage scenario? Or have no idea on how to choose a high efficiency one? Or even you just come across transformer operation issues and get stuck?
Come to OMEK Power! Our experts with more than 20 years experience can guide you patiently.
OMEK also welcome you to visit our factories on site, to see how our professional workers produce your orders! Firsthand look helps you make a smart decision!
As a leading distribution transformer manufacturer in China, OMEK Power owns more than 20 large warehouses and various agents arcoss many countries.
In 2025, OMEK has built a local factory in Ethiopia.This ensures fast delivery to our African clients. Our local technical team will respond to your needs faster, more efficiently, to help you avoid project delays.
Maintenance of Our Distribution Transformer
OMEK Power’s distribution transformer maintenance manual applies to 10-2000kVA (10kV-35kV), small power transformers, distribution transformer (fully sealed and non-sealed transformers).
It is used to guide the lifting, transportation, acceptance, storage check, overall reassembly, handover test, commissioning and maintenance of the product.
* Warm reminder: For distribution networks equipped with step voltage regulators, OMEK advises including these units in your regular maintenance schedule. This helps sustain a safe, stable and healthy voltage performance across the whole distribution line.
Distribution Transformer Uses
Related Offings
FAQs
Have any questions? We’re here to help you out.
Power transformer:
- It usually connects to the power plant and ultra high voltage power grid directly;
- The common primary voltages for the power transformer are always above 66kV;
- It plays roles in both step down and step up the voltage;
- It required extremely high insulation and load characteristics;
- It is used upstream of the distribution transformer.
Distribution type transformer:
- It is used at the end of the power distribution system;
- It only plays a role as a step down transformer;
- The common primary voltages that the distribution type transformer connect are 10kV, 33kV etc.;
- Besides, its rated capacity is relatively less than the power transformer. Generally less than 20MVA.
For example, a power plant produces an ultra high voltage of 220kV, this is the time a power transformer can come into service. It helps to step down the 220 kV voltage to a lower voltage, such as 33kV. Then the distribution transformer will help step down the voltage further to provide power for final users.
For more details, you can review our article – 7 Key Differences Between Power and Distribution Transformers
✅ Converter transformer is responsible for transforming the AC (alternating current) to DC (direct current) or doing opposite transforming. It is specifically designed to solve the difficulties in long distance power transmission with higher losses.
✅ Distribution transformer is responsible for step down the higher voltage from the power plant to a lower voltage that can be used directly by the residents, shopping malls and factories, etc.
They have different functions, so do their designs. Compared with the distribution type transformer, the converter transformer’s design is usually more durable and precise as it will face more challenges, such as harmonic interference and DC magnetic bias.
The distribution transformer failures mainly come from two sides. One is internal failure and the other is caused by external factors.
🔘 The common internal failures include:
1) Winding insulation is aging or damaged, leading to short circuits and breakdowns.
Perhaps it is because the insulation materials used by the power distribution transformer supplier were of poor quality, or the insulation layer is not wrapped well during production.
2) The key part – transformer’s core.
Immature techniques result in gaps between the silicon steel sheets. Thus a series of problems will arise, such as vibration and noise, increasing eddy-current loss, even baking the insulation parts.
Other internal failures include tap switch failures, oil impurities or leaking.
🔘 The common external failures include overvoltage impulse caused by lightning stroke, severe environment and long time overload running.
To avoid common fault risks and ensure top-tier safety, OMEK conducts different testings for each process, to acheive zero failure performance of the distribution transformers. To date, we have earned 100% positive feedback from our customers.
Contact us for a quick quote. Contact Us