In the realm of liquid-filled transformers, the choice of transformer oil plays a pivotal role in ensuring smooth operation. The traditional go-to, mineral oil, is facing stiff competition from FR3, a natural ester derived from seed oils. Since the 1990s, FR3 has emerged as a safer, more sustainable alternative, offering unique advantages that set it apart in the world of transformers, as reported by Maddox Industrial Transformer.

Unlike mineral oil, FR3 boasts a higher flash point of 330°C, significantly reducing the risk of fire. Classified as a "non-propagating" fluid, FR3 is self-extinguishing, making it a preferred choice with zero reported pool fires in transformers filled with this innovative fluid. The safety benefits extend to cost savings, as FR3-filled transformers can be installed indoors without expensive fire-suppression systems.

FR3's superiority is further evident in its ability to draw moisture out of insulation paper, extending the transformer's life expectancy by as much as 5–8 times. This, coupled with the fluid's higher saturation point, slows the aging process of insulation paper, providing a substantial increase in the lifespan of FR3-filled transformers.

The environmental impact of FR3 is a key highlight. Derived from seed oils, FR3 is entirely biodegradable, with over 99% biodegradation in just 28 days. This eco-friendly characteristic contrasts sharply with mineral oil, which poses environmental risks due to its hydrocarbon-based and non-biodegradable nature.

While FR3 comes at a higher cost compared to mineral oil, the additional expenses associated with the latter, including safety measures and environmental remediation in case of spills, make FR3 a cost-effective and environmentally responsible choice for the future of liquid-filled transformers.

Source: maddoxtransformer.com