Transmission & Distribution
Natural Ester Immersed Power Transformer

The transformer delivers exceptional safety and environmental performance by utilizing a soybean-derived natural ester (FR3® Fluid) (see Note 1) as the insulating medium. It is fully compliant with IEC and IEEE standards to meet the demands of the global market.

Note 1

FR3® Fluid : Fire Resistance 3rd Generation, a registered trademark of Cargill, Incorporated.

Key application examples

Ideal for facilities that require high environmental performance:

Industrial plants
Industrial plants
Data centers
Data centers
Hydroelectric power plants
Hydroelectric power plants

Features

Benefit 1 :Safety certification

With a burning point of 360°C (and a flash point of 330°C), the flame-retardant fluid offers high safety against fire and contributes to the reduction of ancillary equipment for fire protection and fire extinction.
Excellent flame retardant

Natural esters have a burning point of 360°C (and a flash point of 330°C). This flame-retardant fluid has a burning point higher than that of conventional mineral oil by more than 200°C. It is ideal for transformers such as those used in industrial plants, data centers, and hydroelectric power plants, for which high environmental performance is sought.

Burning Point Comparison
Safety certification

Natural ester (FR3® Fluid) has been demonstrated to be safe through arc ignition and fire tests that simulate transformer fires. The ester has been granted FM (Note 1) and UL (Note 2) certifications, which are third-party certifications.

Note 1

Approved by FM Global, Standard 6933 (Less Flammable Transformer Fluids)

Note 2

Certified under UL’s EOVK (transformer fluid) standard

Stable supply of resources

Soybeans, the resource from which the natural ester (FR3® Fluid) is derived, boast high yields and production (cultivation) areas (Note). The supply is stable, so you can rest assured that you will have access to the ester that you need.

Note

Cargill, a manufacturer of natural esters, has 7 production bases in the world (as of January 2023).

Benefit 2 :Environmental protection

Because the ester is biodegradable and non-toxic, the environmental impact is reduced even in cases of insulation oil leaks.
Reduced environmental impact due to high biodegradability

The ester is natural, highly biodegradable (Note), and non-toxic. Even in the event of a leakage of insulating oil, the environmental impact is minimized.

Note

Biodegradability refers to the ability of organic compounds to be broken down into inorganic substances such as water and carbon dioxide by microorganisms in water and soil.

Comparison of biodegradability of natural esters and mineral oils (Note)
Biodegradability Impact of oil leakage
Natural ester
(FR3® Fluid)		 99% Low environmental impact and processing costs due to biodegradability
Mineral oil 23% Significant costs to treat pollution (in the soil and ocean)

Note

Based on the results of aerobic biodegradation tests (OECD 301 B)

Significant reductions in CO₂ emissions

Because natural esters absorb CO₂ during soybean growth and consume less energy during oil production, CO₂ emissions during the life cycle from production to disposal are about 2% of those of mineral oil.

Equivalent CO₂ emissions (LC-CO₂) (Note 1)
(Example: 1,000 kVA/unit and 1,893 L of oil)

Note 1

CO₂ emissions based on BEES 4.0
(Building for Environmental & Economic Sustainability)

Note 2

Absorption of CO₂ during soybean growth

Benefit 3 :Conformity to international standards

Various international standards have already been established for natural esters in transformers. The FR3® Fluid used in Fuji Electric's natural ester transformers complies with these international standards.
Conformity to international standards

Numerous standards have been established for natural esters for transformers, including IEC standards. FR3® Fluid conforms to the following standards.

Topic IEC standard Other standard
New unused fluid IEC 62770 ASTM D6871
Maintenance IEC 62975 IEEE C57.147
DGA (Dissolved Gas Analysis) IEC 60567 IEEE C57.155
High temperature insulation IEC 60076-14 IEEE C57.154
Fire safety IEC 60695-1-10 IEEE Std 979
Oxidation stability IEC 61125 ASTM D6186

Specifications

Please feel free to consult us about ratings other than those listed below.

Rated voltage 11 to 154 kV
Rated capacity 2 to 100 MVA
Conformed standard IEC, IEEE
Temperature class Class A
Ambient temperature -10 (Note) to +40℃

Note

A cold start is required at oil temperatures of -20 to -10°C. Please inquire separately.

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