750 KVA Oil-Filled ONAN Transformer

Henan GNEE Electric Co., Ltd. is one of the leading manufacturers and suppliers of 750 kva oil-filled onan transformer in China, also supports customized service with low price. Welcome to buy discount 750 kva oil-filled onan transformer for sale here from our factory. If you have any enquiry about pricelist, please feel free to email us.

 

A 750 kVA oil‑filled ONAN transformer is a 750 kilovolt‑ampere oil‑immersed distribution transformer that uses ONAN cooling as its standard cooling method.

 

 

At GNEE, we take pride in being a premier global manufacturer and supplier of high-quality electrical distribution equipment. With decades of expertise in power engineering, our factory specializes in designing and producing the 750 kVA oil-filled ONAN transformer, a robust solution engineered to meet the rigorous demands of modern industrial and commercial power grids.

 

Whether you are upgrading an existing substation or developing a new infrastructure project, our transformers provide the perfect balance of efficiency, safety, and longevity.

 

 

The 750 kVA oil-filled ONAN transformer is one of the most versatile units in the medium-voltage category. The "ONAN" (Oil Natural Air Natural) cooling system represents the gold standard for reliability in outdoor and indoor environments. In this configuration, the transformer uses natural convection of the oil to move heat away from the core and coils, while the external air naturally cools the radiator fins.

 

As a leading manufacturer, GNEE ensures that every 750 kVA unit is built to minimize energy loss. By choosing an oil-filled design over dry-type alternatives for specific high-capacity applications, users benefit from superior insulation properties and a longer operational lifespan. The oil not only acts as a coolant but also serves as an excellent dielectric medium, protecting the internal components from electrical arcing and moisture.

 

 

To ensure our clients make informed procurement decisions, we maintain full transparency regarding our technical standards. Our transformers are manufactured in compliance with international standards such as IEC 60076, IEEE C57, and ISO 9001.

Feature	Specification Details
Rated Capacity	750 kVA
Cooling Type	ONAN (Oil Natural Air Natural)
Number of Phases	3-Phase
Frequency	50 Hz / 60 Hz
Primary Voltage	6kV, 10kV, 11kV, 13.8kV, 20kV, 33kV (Customizable)
Secondary Voltage	400V, 415V, 480V (Customizable)
Vector Group	Dyn11 / Yyn0 / Custom
Winding Material	High-Conductivity Copper or Aluminum
Insulation Class	Class A
Tap Changer	Off-circuit Tap Changer (OCTC) or On-load Tap Changer (OLTC)
Standard Compliance	IEC, ANSI, IEEE, GB

 

Our engineering team focuses on three core pillars: efficiency, durability, and ease of maintenance. When you invest in a 750 kVA oil-filled ONAN transformer from GNEE, you are getting a product built with:

 

High-Grade Core Materials: We utilize cold-rolled grain-oriented (CRGO) silicon steel for the core. This significantly reduces no-load losses and noise levels, ensuring the transformer operates quietly and economically.

 

Superior Winding Technology: Our coils are wound with high-purity copper or aluminum, depending on client requirements. Advanced winding techniques prevent mechanical displacement during short-circuit events.

 

Hermetically Sealed Tanks: To prevent oil oxidation and moisture ingress, our tanks are often hermetically sealed or equipped with high-quality conservators and silica gel breathers. This extends the maintenance interval and protects the dielectric strength of the oil.

 

Corrosion-Resistant Finish: The exterior of our transformers undergoes a multi-stage painting process, including sandblasting and epoxy powder coating, making them ideal for harsh environmental conditions, including coastal or industrial areas.

 

 

The 750 kVA oil-filled ONAN transformer is a workhorse across various sectors. Its capacity is ideal for medium-sized loads where reliability cannot be compromised.

 

Common applications include:

• Manufacturing Plants: Providing stable power for machinery, HVAC systems, and assembly lines.
• Renewable Energy Sites: Stepping up voltage for solar farms and wind turbine clusters.
• Commercial Complexes: Powering shopping malls, high-rise office buildings, and hospitals.
• Mining and Heavy Industry: Withstanding the high-torque demands of industrial motors and heavy-duty processing equipment.

 

 

By integrating GNEE's transformer technology, facility managers can ensure a steady power supply while reducing the risk of unplanned downtime caused by electrical failure.

 

 

As a professional manufacturer, GNEE doesn't just sell products; we provide peace of mind. Every 750 kVA oil-filled ONAN transformer undergoes a rigorous suite of factory acceptance tests (FAT) before it leaves our facility.

 

These tests include:

• Measurement of winding resistance.
• Measurement of voltage ratio and check of phase displacement.
• Measurement of short-circuit impedance and load loss.
• Measurement of no-load loss and current.
• Dielectric routine tests (Separate source AC withstand and short-duration induced overvoltage).
• Oil leak testing under pressure.

 

 

We understand that a transformer is a precision instrument. GNEE employs heavy-duty export packaging standards. Each 750 kVA oil-filled ONAN transformer is securely fastened to a steel or wooden skid, protected by moisture-proof wrapping, and crated in reinforced wooden boxes if necessary. We coordinate with leading logistics partners to ensure your equipment arrives on-site, on time, and ready for installation.

 

 

In the world of power distribution, reliability is the ultimate currency. The 750 kVA oil-filled ONAN transformer from GNEE offers an industry-leading combination of high-efficiency performance, rugged construction, and low maintenance requirements.

 

As a specialized manufacturer, we are ready to customize our designs to meet your specific voltage requirements and environmental challenges.

Request A Quote

 

Ready to power your next project? Don't settle for generic solutions when you can get factory-direct expertise.

 

[Click here to Request a Quote] or contact our technical sales team today to receive a comprehensive proposal and CAD drawings for your 750 kVA oil-filled ONAN transformer.

 

Let GNEE be the backbone of your electrical infrastructure!

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