FR3® fluid technical details
The best dielectric fluid gets you improved cost in use, reliability, performance, fire safety, and environmental impact.
The natural ester fluid that beats the alternatives
Derived from 100% renewable vegetable oils, biobased FR3 fluid is superior to mineral oil and other natural ester fluids for use in distribution and power generation transformers of all voltage classes (both new and retrofilled); HV testing validates use of FR3 fluid though 765kV. FR3 fluid is also suited for other fluid-filled distribution and power equipment, such as voltage regulators, circuit breakers (switchgear), rectifiers, phase-shifters, and HVDC transformers.
Its unique properties provide advantages that mineral oil cannot match, and its effectiveness has been proven for decades in millions of transformers across the globe. In particular, with FR3 fluid you can expect:
FR3 fluid exceeds IEEE and IEC specifications, and is FM approved and UL listed.
FR3 fluid properties: Standard acceptance values and typical values
|Standard test methods||ASTM D6871/IEEE C57.147||IEC 62770||FR3 Fluid|
|Property||ASTM||ISO/IEC||As-received new fluid property requirements||Unused new fluid property requirements||Typical|
|Flash Point PMCC (ºC)||D93||ISO 2719||-||≥250||260|
|Flash Point COC (ºC)||D92||ISO 2592||≥275||-||320-330|
|Fire Point (ºC)||D92||ISO 2592||≥300||>300||350-360|
|Pour Point (ºC)||D97||ISO 3016||<-10||≤-10||-21|
|Density at 20ºC (g/cm2)||-||ISO 3675||-||≤1.0||0.92|
|Relative Density (Specific Gravity) 15ºC||D1298||-||≤0.96||-||0.92|
|Viscosity (mm2/sec)||D445||ISO 3104|
|≤15||≤15||7.7 - 8.3|
|40ºC||≤50||≤50||32 - 34|
|Visual Examination||D1524||IEC 62770 4.2.1||Bright and clear||clear, free from sediment and suspended matter||clear, light green|
|Biodegradation||OECD 301||readily biodegradable||readily biodegradable||readily biodegradable|
|Dielectric Breakdown (kV)||D877||-||≥30||-||47|
|Dielectric Breakdown (kV)|
|2.5mm gap||-||IEC 60156||-||≥35||>50|
|Dielectric breakdown / impulse, needle/spere, 25C, 25.4mm[kV]|
|Gassing tendency (mm/min)||D2300||-||≤0||-||-79|
|25ºC (%)||D924||-||≤0.20||-||0.010 - 0.15|
|90ºC (tan ∂)||-||IEC 60247||-||≤0.05||0.02|
|100ºC(%)||D924||-||≤4.0||-||0.41 - 3.85|
|Corrosive Sulfur||D1275||IEC 62697||non-corrosive||non-corrosive||non-corrosive|
|Water Content (mg/kg)||D1533||IEC 60814||≤200||≤200||4 - 50|
|Acid Number (mg KOH/g)||D974||IEC 62021.3||≤0.06||≤006||0.013 - 0.042|
|PCB Content (mg/kg)||D4059||IEC 61619||not detectable||free from PCBs||not detectable|
|Total Additives||-||IEC 60666||Max weight fraction 5%||<2%|
|Oxidation Stability (48 hrs, 120ºC)||-||IEC 61125C|
|Total Acidity (mg KOH/g)||-||IEC 62621.3||≤0.6||0.1|
|Total Acidity (mg KOH/g)||-||ISO3104||≤30% increase over initial||17.1%% increase|
|Dissipation Factor at 90ºC (tan ∂)||-||IEC 60247||≤0.05||0.1|
Note: Specifications should be written referencing only the defined ASTM or IEC acceptance values and test methods. The listed “typical” values are averaged values summarized from a significant number of data points over many years; they are not to be identified as acceptance values.
ASTM D6871 Standard Specification for Natural (Vegetable Oil) Ester Fluids Used in Electrical Apparatus.
IEC 62770: Fluids for electrochemical applications — Unused natural ester liquids for transformers and similar electrical equipment.
A transformer filled with FR3 fluid complies with the transformer temperature operating ranges requirements defined in IEEE C57.12.00 and IEC 60076-1.
Learn how FR3 fluid’s properties make it superior to mineral oil. Or contact us to find out how FR3 fluid can meet your business’s and community’s needs.
FR3 natural ester fluid details: Delivering superior results
1. Based on accelerated aging tests with Kraft and thermally upgraded Kraft (TUK) paper, per IEEE C57.100.
2. IEC 60076-14 Part 14: Liquid-immersed power transformers using high-temperature insulation materials. Edition 1.0. September 2013; IEEE C57.154 Standard for the Design, Testing, and Application of Liquid-Immersed Distribution, Power, and Regulating Transformers Using High-Temperature Insulation Systems and Operating Elevated Temperature. October 30, 2012.
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