Insulation Performance and Temperature Rise Test of 1000 kVA Oil-Immersed Transformer

In the world of power distribution, reliability is synonymous with rigorous testing.

 

At GNEE, we are a premier manufacturer of high-voltage equipment, specializing in the design and production of the 1000 kVA oil immersed transformer. Ensuring the longevity of a 1000 kVA Oil Filled Transformer requires a deep understanding of its insulation performance and thermal limits. These two factors directly dictate the life expectancy and safety of the unit.

 

Whether you are deploying an Outdoor Power Transformer in a tropical climate or an industrial park, verifying these parameters through professional oil filled transformer testing is non-negotiable for operational success.

 

 

The insulation system of a 1000 kVA oil immersed transformer is its most vulnerable yet critical component. It consists of a combination of liquid insulation (transformer oil) and solid insulation (cellulose paper and pressboard).

 

At GNEE, our manufacturing process involves high-vacuum oil filling and precision winding to eliminate air pockets that could lead to partial discharge. For a three phase oil immersed transformer, the insulation must withstand not only the continuous operating voltage but also transient over-voltages caused by lightning or switching surges. By utilizing high-purity mineral oil, our oil immersed type transformer ensures a high dielectric strength, providing a robust barrier against electrical breakdown.

 

GNEE Factory Winding Process for 1000 kVA Oil Immersed Transformer Insulation

 

 

Temperature rise testing is the definitive method to determine if a transformer can handle its rated load without the insulation degrading prematurely. For a 1000 kVA Oil Filled Transformer, the heat generated by "copper losses" (windings) and "iron losses" (core) must be efficiently dissipated by the cooling system.

 

During the temperature rise test at our facility, the transformer is subjected to a total loss equivalent to its rated capacity. We measure the "Top Oil Temperature Rise" and the "Average Winding Temperature Rise."

 

According to IEC 60076 standards, the typical limit for top oil rise is 60K, and for windings, it is 65K. If an oil immersed type transformer stays within these limits, it guarantees that the solid insulation will not become brittle, thereby extending the service life of the oil filled distribution transformers.

 

 

To pass the rigorous oil filled transformer testing, the quality of specific oil immersed transformer parts must be exceptional.

 

 

• Radiators and Cooling Fins: These are essential for the ONAN (Oil Natural Air Natural) cooling process. Their surface area is precisely calculated based on oil filled transformer sizes.
• Transformer Oil: Acts as the primary heat transfer medium. GNEE uses oil with high oxidation stability.
• The Tank: Designed to facilitate the thermosiphon effect, where hot oil rises and cool oil sinks, ensuring a continuous cycle.
• Gaskets and Seals: High-temperature resistant materials are used to prevent leaks during the expansion and contraction phases of the Outdoor Power Transformer.

 

 

Below are the standard technical parameters for our 1000 kVA units, reflecting the results of our insulation and temperature performance benchmarks.

 

Technical Parameter	Specification Value
Rated Capacity	1000 kVA
Type	Three Phase, Oil Immersed, Step-Down
High Voltage (HV)	6kV, 10kV, 11kV, 22kV, 33kV
Low Voltage (LV)	0.4kV, 0.415kV, 0.48kV
Insulation Level	LI 75 / AC 28 (Standard 10kV Class)
Top Oil Temp Rise	≤ 60K
Winding Temp Rise	≤ 65K
Cooling Method	ONAN
Oil Weight	Approx. 550 kg - 650 kg
Total Weight	Approx. 2450 kg

 

 

When we conduct oil filled transformer testing, we aren't just checking boxes; we are verifying the engineering integrity of our product.

 

An Outdoor Power Transformer is exposed to UV radiation, rain, and varying ambient temperatures. If the insulation performance is subpar, moisture can ingress, leading to catastrophic failure. At GNEE, we provide full type-test reports with every 1000 kVA oil immersed transformer. Our testing laboratory is equipped with state-of-the-art impulse generators and power frequency withstand test sets, ensuring our status as one of the most trusted oil filled transformer manufacturers globally.

 

Professional Oil Filled Transformer Testing 

 

 

Innovation in material science has allowed GNEE to reduce the oil filled transformer sizes without compromising on safety. By using thermally upgraded paper, our three phase oil immersed transformer units can operate at slightly higher temperatures without the same rate of insulation aging.

 

Furthermore, we offer "K-Class" ester fluids as an alternative to mineral oil for clients requiring higher fire safety standards. This bio-degradable option enhances the insulation life of the 1000 kVA Oil Filled Transformer and offers a flash point significantly higher than traditional mineral oil, making it an excellent choice for environmentally sensitive locations.

 

 

Selecting among various oil filled transformer manufacturers requires looking beyond the price tag. You must evaluate their testing capabilities and the quality of their oil immersed transformer parts.

 

GNEE offers:

• Decades of Expertise: A specialized team of engineers focused on oil filled distribution transformers.
• Global Compliance: Products designed to meet IEC, ANSI, IEEE, and AS/NZS standards.
• Transparent Documentation: Every 1000 kVA oil immersed transformer comes with a detailed manual and certified test certificates.
• Customization: Tailoring the oil filled transformer sizes to fit your specific substation footprint.

 

GNEE 1000 kVA Transformer Delivery and Packaging Quality

 

 

In conclusion, the insulation performance and temperature rise characteristics are the "vital signs" of your power system. A GNEE 1000 kVA oil immersed transformer is engineered to exceed standard requirements, ensuring that your investment is protected against the stresses of modern electrical loads. From our high-grade oil immersed transformer parts to our meticulous oil filled transformer testing, we guarantee a product that delivers performance and peace of mind.

Request A Quote

 

Whether you need a three phase oil immersed transformer for a utility project or an Outdoor Power Transformer for a remote site, GNEE has the expertise to support you.

 

Ready to ensure your project's power stability?

 

Contact GNEE today for a free technical consultation and a formal quote on our 1000 kVA Oil Filled Transformer. Leave your inquiry below, and our engineering team will provide a customized solution within 24 hours! 

 

FAQ

 

What is a 1000 kVA transformer and where is it used?

A 1000 kVA transformer is a medium-capacity power transformer used to step up or step down voltage in industrial and commercial power systems. It is widely applied in factories, commercial buildings, substations, renewable energy projects, and infrastructure developments where stable power distribution is required.

 

What is the difference between a 1000 kVA dry type transformer and a 1000 kVA oil immersed transformer?

A 1000 kVA dry type transformer uses air for cooling and is ideal for indoor installations with high safety requirements. A 1000 kVA oil immersed transformer (or 1000 kVA oil filled transformer) uses insulating oil, offering better cooling, higher efficiency, and stronger overload capacity, making it suitable for outdoor and heavy-duty applications.

 

Which is better: 1000 kVA dry type transformer or 1000 kVA oil filled transformer?

It depends on your application. A 1000 kVA dry type transformer is better for indoor use, such as hospitals or commercial buildings, due to its fire safety and low maintenance. A 1000 kVA oil filled transformer is better for industrial or outdoor environments because of its durability, efficiency, and lower initial cost.

 

What is a 1000kVA cast resin dry type transformer?

A 1000kVA cast resin dry type transformer is a type of dry transformer where the windings are encapsulated in epoxy resin. This design improves insulation, reduces fire risk, and enhances performance in humid or dusty environments, making it ideal for critical indoor installations.

 

What is the typical cost of a 1000kVA oil immersed transformer?

The 1000kVA oil immersed transformer cost varies depending on specifications such as voltage, materials (copper or aluminum), efficiency level, and customization. Generally, oil immersed transformers have a lower upfront cost compared to dry type transformers, but total lifecycle cost should also consider energy losses and maintenance.

 

What are the key specifications of a 1000 kVA transformer?

Typical specifications of a 1000 kVA transformer include:

• Voltage: 6kV / 10kV / 11kV / 33kV to 0.4kV
• Frequency: 50Hz / 60Hz
• Cooling: ONAN (oil) or AN/AF (dry type)
• Vector group: Dyn11
• Standards: IEC / CE

These parameters can be customized based on project requirements.