Stable · Efficient · 1250 kVA Transformer
The 1250 kVA transformer produced by OMEK offers high efficiency, stable voltage regulation and reliable performance. These chracteristics make it an ideal choice for industrial plants, distribution substations and many other uses. The robust design makes it possible to operate even under demanding conditions.
Jinan Omek Electric Power Co., Ltd. (OMEK Power), is a trustworthy transformer manufacturer with more than 16 years history. Every year we export 56,000 units of transformers.
1250 kVA Transformer
Key Highlights
As a trusted 1250 kVA transformer manufacturer, OMEK ensures that each unit is highly efficient, stable in performance, and provides a longer service life. That’s why it can be an ideal choice for global customers seeking durable 1250 kVA transformers for sale from a professional supplier.
1. Power Bearing Capacity
The rated capacity reaches 1250 kVA, which matches high-power electrical scenarios such as factory production lines, large-scale infrastructure, and commercial complexes. Even under heavy-load conditions, it can still keep stable output and capable of bearing core loads for a long time while avoiding production disruptions caused by voltage fluctuations.
2. Efficiency & Energy Saving
OMEK adopts high-quality iron core and winding materials, and the no-load loss and load loss of our transformers are lower than industry standards. This helps reduce your long-term electricity costs. It meets energy efficiency grade requirements and international energy-saving certifications, helping enterprises achieve green production.
3. Reliability & Durability
With industrial-grade design and high protection level, OMEK transformers adapt to complex working conditions such as high and low temperatures and humidity, with a long service life. With strong resistance to overloads and short circuits, the transformer is less likely to suffer unexpected downtime and needs less maintenance.
4. Flexible Adaptation & Compliance
The voltage regulation range is wide, giving you flexibility to adjust according to your needs. It is also compatible with different power grid standards. Our transformers are certified by international authorities such as CE and ISO, which shows that they satisfy the installation and usage standards of different regions worldwide
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Basic Specifications of 1250 kVA Transformer
Rated capacity: 1250 kVA
Number of phases: 3 phase
Frequency: 50/60 Hz
Voltage class: 6-11 kV/400 V (primary/secondary voltage)
Tap range:±2×2.5%
Basic Specifications of 1250 kVA Transformer
Installation method: indoor/outdoor
Ambient temperature: -25°C to +40°C (up to +50°C upon request)
humidity range: ≤90% (25°C）
Compatible power grid standards: IEC/ANSI
Certification qualifications: CE, ISO 9001
1.25 MVA 11/0.433 kV Transformer Dimensions and Weight
Below are the dimensions and weight of OMEK Power’s 1.25 MVA 11/0.433 kV oil-immersed transformer, for your reference.
| Transformer Model | Rated Capacity | Voltage Rating | Weight (kg) | Overall Dimensions (mm) |
|---|---|---|---|---|
| S20-M-1250/11kV | 1.25 MVA | 11/0.433 kV | 3210 | 1660×1180×1430 |
| S13-M-1250/11kV | 1.25 MVA | 11/0.433 kV | 2785 | 1630×1090×1540 |
Key Features & Advantages
- High mechanical-strength windings for improved reliability
- Low noise and low loss design
- High thermal stability and overload capability
- Available with copper or aluminum windings
- Optimized 1250 kVA transformer efficiency for lower energy consumption
- Manufactured by an experienced 1250 kVA transformer manufacturer with global supply capacity
- Raw Material Sourcing & Inspection：Strictly select high-quality raw materials. Conduct pre-production inspection for all materials to meet IEC/ANSI/CE standards.
Applications
The 1250 kVA transformer is commonly used in these areas:
You can think of substations as the “middle station” of electricity. Power comes at a very high voltage and then is reduced to a level suitable for people to use. In this way, no matter in urban or rural areas, homes, stores and factories can receive a steady power supply all the time.
In factories where large machineries keep running, some equipment consume a lot of power in a very short time. This transformer can help people handle heavy loads and sudden changes, so as to help production lines run smoothly and avoid frequent shutdowns.
In many commercial places like shopping malls, office buildings, and hotels, transformers are indispensable since they rely on stable power every minute. The necessary facilities like lighting, air conditioning and elevators all need electricity. Our 1250 kVA transformer makes sure everything runs normally, even during busy hours.
In city and rural power grids, these transformers are everywhere. They help move electricity from power plants to end users efficiently and safely. Without transformers, we wouldn’t have the comfortable modern life we enjoy today.
Railway stations, tunnels, bridges, and other major projects all need reliable power. OMEK 1250 kVA transformer can provide strong and steady electricity, support safe operation and long-term use. It acts as the “energy cornerstone” behind urban development.
Wind turbines and solar panels usually produce electricity at a low voltage. This transformer helps raise that voltage so the power can be sent into the grid. It plays an important role in using clean energy and reducing carbon emissions, making green power truly useful in daily life.
Environmental Footprint & Materials
As a municipal green factory, our transformers are designed with energy-saving magnetic core materials and eco-friendly insulation options, thus supporting sustainability goals.
Services & Support
OMEK provides complete technical and commercial support as a global 1250 kVA transformer supplier.
Our services include:
Successful Cases
Client Location: Vietnam
Industry: Heavy Manufacturing
Solution: 1250 kVA Oil-Immersed Distribution Transformer
Challenge: Frequent voltage fluctuations caused equipment failures and production delays.
What We Did:
OMEK supplied a high-efficiency 1250 kVA transformer with low-loss CRGO core to stabilize voltage and improve system reliability.
Result:
28% reduction in equipment downtime
Improved power stability across the production line
Lower maintenance cost due to durable coil structure
Client Location: UAE
Industry: Commercial Real Estate
Solution: 1250 kVA Dry-type Transformer
Challenge: The building required a fire-safe, low-maintenance transformer for indoor installation.
What We Did:
We provided a cast-resin 1250 kVA dry-type transformer with high insulation strength and low noise level.
Result:
Safe indoor operation with no fire or oil-leak risks
15% improvement in energy efficiency
More stable power for HVAC, elevators, and lighting
Client Location: Chile
Industry: Renewable Energy
Solution: 1250 kVA Step-Up Transformer
Challenge: The solar farm needed a transformer with high overload capacity and excellent heat dissipation.
What We Did:
OMEK delivered an oil-cooled 1250 kVA transformer optimized for high altitude and extreme temperature fluctuations.
Result:
24/7 reliable operation in harsh climates
Improved power transmission efficiency
Extended service life with minimal maintenance
Related Products
FAQs
Have any questions? We’re here to help you out.
The current in a transformer is calculated based on the standard three-phase AC current formula. The calculation depends on the transformer’s rated power (kVA), voltage (V), and the relationship between power and current.
For three-phase transformers, the current is calculated using the following formula:
I= Transformer current (in Amps, A)
S= Transformer rated power (in kVA)
V = Transformer voltage (in Volts, V)
Here, the voltage refers to either the input voltage (primary/high-voltage side) or output voltage (secondary/low-voltage side), depending on which side of the transformer you are calculating the current for.
1. Calculate the Current on the Low-Voltage Side (Secondary / LV)
For example, let’s take a 1250 kVA transformer with an output voltage of 400 V.
Result: Low-voltage side current ≈ 1804 A
2. Calculate the Current on the High-Voltage Side (Primary / HV)
Now, for the same 1250 kVA transformer with an input voltage of 11 kV.
Result: High-voltage side current ≈ 65.6 A
Important Notes
Voltage units: High-voltage side typically has a higher voltage (e.g., 11 kV), while the low-voltage side has a lower voltage (e.g., 400 V).
Current units: The current is measured in Amps (A). The current on the high-voltage side is smaller, while the current on the low-voltage side is larger, reflecting the inverse relationship between voltage and current.”
The impedance varies depending on standards and manufacturer design.
Typical values for a 1250 kVA distribution transformer:
4% – 6% for oil-immersed
6% – 8% for dry-type
OMEK offers customized impedance based on IEC or ANSI requirements.
The price of a 1250 kVA transformer depends on several factors, including the following:
Transformer type:
Dry-type transformers are usually more expensive because of the costly epoxy insulation and complex casting process. But they are safer to install indoors for they don’t leak oil or pose fire risks.
Oil-immersed transformers are cheaper to buy, more efficient at cooling, and typically last longer since the oil can be filtered and replaced. But they require a dedicated room or oil containment pit, which adds to installation costs.
Voltage Level:
Obviously, a 10 kV transformer is not the same as a 30 kV transformer. The higher the voltage level, the higher the requirements for the design of the transformer, and need more raw material to manufacture. This will naturally affect the price.
Extra Functions:
Additional features such as tap changers, protection devices, or special insulation materials can increase the cost.
Materials:
Copper windings are typically more expensive than aluminum windings but offer better efficiency.
CRGO Steel Core or Amorphous Steel Core can also affect pricing.
Brand and Supplier:
Prices can vary greatly from one supplier to another. Brand reputation, production standards, and export services all play a role.
Get a Custom Quote:
For a more precise price, it’s better to reach out to manufacturers with the exact specifications you need. As a leading transformer manufacturer, OMEK can provide customized pricing based on your needs, as well as options for different configurations, materials, and additional features.
Let me know if you need assistance with a specific quote!