Natural ester FR3 insulating liquid — Very paper friendly

Envirotemp™ FR3™ fluid is a renewable, bio-based natural ester (vegetable oil) dielectric coolant for the use in distribution- and power transformers. Because of the exceptionally high flash/fire points of approximately 330/360 °C, the readily bi-odegradation and the very small CO₂ footprint this fluid is used more and more worldwide. As the dielectric fluid is always in direct contact with the insulation paper the complex interaction between paper and fluid should be understood very well. Comparisons were made between mineral oil and the natural ester FR3™ fluid as dielectric fluid.