2. Oil Type Oil acts as an insulating medium and coolant for the transformer windings and core. • FR3 Fluid - biodegradable, natural ester- based insulating oil used in transformers, offering high fire safety (high flash point), excellent moisture tolerance, and extended insulation life - D6871 / IEEE C57147 standard.
•
Mineral Oil - petroleum-based insulating and cooling fluid most common transformers, offering good dielectric strength and thermal performance but is flammable and less environmentally friendly - D3487 / IEEE C57106 standard.
FR3 Fluid
Mineral Oil (Traditional Choice)
Flash Point Fire Point
330ºC 360ºC
155ºC 165ºC
Costs
$$$
$
Enhanced insulation life
Potential for insulation degradation Less heat tolerant
Comparisons
Increased loading capacity Reduced risk of failure – moisture & contaminant resistant
Degrades over time – moisture & contaminants intrusion
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