FR3 fluid is superior to mineral oil in critical ways.
First, FR3 natural ester dielectric fluid is vegetable based, which accounts for its remarkable fire safety and superior environmental friendliness. It is an FM approved and UL classified K-class (“less flammable”) liquid with twice the flash and fire points of mineral oil, so it is less likely to start on fire. In fact, there have been ZERO reported fire-related failures of FR3 fluid-filled transformers since the product was launched decades ago. In addition, unlike mineral oil, FR3 fluid, even if ignited by an external heat source, will quickly self-extinguish when the heat sources is removed. So even though failures might still happen, fires don’t have to. Learn more about FR3 fluid and fire safety.
Second, FR3 fluid’s superior moisture tolerance compared to that of mineral oil allows it to absorb and consume dissolved moisture, slowing the aging process of insulation paper and preserving the dielectric capacity of the insulation system. This feature explains how and why FR3 fluid helps protect a transformer’s solid insulation system, extending the asset life of the transformer. Learn more about FR3 fluid and superior performance.
Third, with the standardized high temperature capability, transformers filled with FR3 fluid can operate 20°C warmer than mineral-oil filled-transformers without accelerating the aging rate of the solid insulation system. This capability provides utilities with the flexibility to (a) increase loading capacity up to 20%, (b) extend asset life, or (c) achieve a combination of both. Learn more about FR3 and grid resiliency.
Fourth, using FR3 fluid instead of mineral oil in power and distribution transformers provides significantly better environmental benefits, since it is ultimately biodegradable (according to EPA OPPTS 835.3100), readily biodegradable (according to OECD 301 B and EPA OPPTS 835.3110), carbon neutral (according to BEES 4.0 lifecycle analysis), and nontoxic and nonhazardous in soil and water (according to OECD oral and aquatic toxicity tests). Learn more about how FR3 fluid is better for the planet.