400 kVA Transformer Built for Global Projects
Jinan Omek Electric Power Co., Ltd. (OMEK Power), is an ISO certified transformer manufacturer and exporter. Our 400 kVA represents an important intermediate capacity between light-load distribution and industrial power distribution. It hits a balance among load-bearing capacity, system scalability, and cost efficiency.
Over the years, OMEK Power has regarded customer satisfaction as our goal and long-term cooperation as our principle. Our partners come from over 40 countries across seven continents. Our 400 kVA transformer features excellent quality and a competitive price, and is helping our international partners complete projects timely and efficiently.
400 kVA Transformer Specifications
Take the 400 kVA distribution transformer oil-cooled transformer as an example.
| Power Rating | 400kVA | Surface Treatment | Corrosion-proof coating |
| Rated voltage | 6–38.5 kV / 0.4 kv (OEM) | Transformer Type | Oil-immersed |
| Insulation Medium | Mineral oil | Winding Material | Copper / Aluminum |
| Number of Phase | 3 phase | Vector Group | Dyn11 / Yyn0 / Yzn11 |
| Frequency | 50 Hz / 60 Hz | Tap types | OCTC, OLTC |
| Ambient temperature | -25℃-45℃ Suitable for tropical area installation | Cooling Method | ONAN / ONAF |
| Dimensions | 1260×945×1250(mm) | Weight | 1250kg |
| Standards | In compliance with IEC, IEEE, BS, ISO, etc. | Certification | ASTA test report |
315 kVA, 400 kVA and 500 kVA Transformers, How to Choose?
315 kVA, 400 kVA and 500 kVA transformers are with three capacity ratings that are very close to each other. Below table can help you make a wise choice depending on your actual demand and avoid capacity waste or deficiency.
How Many kW Can OMEK's 400 kVA Transformer Supply?
For typical industrial and commercial loads, the power factor (PF) is usually approximately 0.8.
kW = kVA × PF
Capacity | Usable Load (PF = 0.8) |
315 kVA | 252 kW |
400 kVA | 320 kW |
500 kVA | 400 kW |
As we can see, a 400 kVA transformer can supply 68 kW more usable power than 315 kVA. A 500 kVA transformer supplies 80 kW more usable power than 400 kVA.
You can calculate your total load and then make an appropriate decision.
Size & Weight
The weight and size of the transformer will increase as the capacity of the transformer increases.
The image on the left shows two examples of dry-type and oil-immersed transformers of OMEK.
Customization Options & Installation Solutions
- Optional Configurations and Accessories
- Installation Environment Solutions
- Primary/Secondary voltage options: 6–38.5 kV/0.4 kV
- Cooling type: ONAN, ONAF, AN, AF
- Tap changer type: OCTC / OLTC
- Logo and packaging: Customizable
- Protection & monitoring accessories: Buchholz Relay, oil temperature indicators, winding temperature indicators, pressure relief devices
- Structural design: Oil conservator or hermetically sealed type
- Transformer grounding: Protective earthing/neutral earthing/core earthing
- Suitable for indoor use, basements and distribution rooms
- Dry-type structure is much safer
- Low smoke, non-toxic and low noise
- Suitable for outdoor use in factories, substations and photovoltaic power stations
- Oil-immersed sealed structure
- Waterproof, dustproof and anti-corrosion design
Advantages of OMEK 400 kVA Transformer
Successful Project Cases
Export Region: South America
Transformer Model: 400 kVA 13.8/0.4 kV medium-voltage distribution transformer
Project Type: Power distribution network for residential communities
Project Requirement: Expand the power supply network, improve the power supply capacity to newly developed commercial and residential areas
Problems Solved: The 400 kVA transformers from OMEK Power realized stable power supply to commercial and residential areas through stably reducing voltage and efficient operation.
Export Region: Middle East
Transformer Model: 400 kVA three-phase solar transformer
Project Type: Grid connection of solar power plant generation
Project Requirement: The power output from renewable energy generation needs to be stably connected to the regional power grid
Problems Solved: OMEK 400 kVA transformer supported the conversion of medium-voltage output from solar power plants to the regional power grid. The stability and reliability of the new energy grid connection are enhanced. It has been providing stable power for clean energy power generation.
Export Region: Southeast Asia
Transformer Model: 400 kVA 6.6/0.4 kV medium-voltage distribution transformer
Project Type: Power distribution system for industrial parks
Project Requirement: Factory motors and production lines need extremely stable power output.
Problems Solved: Our 400 kVA transformer provides stable low-voltage power distribution. It supports the continuous operation of production equipment. It also reduces the risk of shutdowns caused by voltage fluctuations.
Our 400 kVA Transformer Real Test Scene
Every OMEK’s 400 kVA transformer delivered to your hand has undergone rigorous routine testing. So be confident in our professionalism and reliability.
OMEK‘s 400 kVA 10/0.4kV transformer's no-load test ongoing
- Our 400 kVA 10/0.4kV transformer is conducted load test
- Induced voltage test in progress for a 400 kVA 10/0.4kV transformer
- Power frequency withstand voltage test, with LV test results
Get in Touch
Whether you are interested in our 400 kVA transformers, or just want a free transformer solution, feel free to contact us. Our expert team will get back to you promptly!
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FAQ
Have any questions? We’re here to help you out.
The current of 400 kVA transformer is related to its voltage levels and phases.
For a 3 phase transformer, the current is calculated like this:
Current (A) = kVA × 1000 ÷ (√3 × Voltage)
Here is a typical example:
For a 400 kVA, 11kV / 0.4kV transformer
The current of LV side (400V)≈ 577 A
The current of HV side (11kV)≈ 21 A
The actual current may vary depending on the efficiency.
The weight of an OMEK 400 kVA transformer varies according to its design and cooling method.
Dry-type: Approx. 1200-1500 kg
Oil-immersed: Approx. 1080-1635 kg
For OMEK 400 kVA transformers, the impedance voltage varies within 4%-6.5% due to different transformer designs and types.
If you want to know the exact impedance value of the transformer type you need, please contact us.
If you want to convert kVA into kW, remember this formula:
kW = kVA × Power Factor
The power factor is not a fixed value, but is determined by the characteristics of the load.
For example, if the power factor of a load is 0.8, then the real power=400 kVA × 0.8=320 kW