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• Retrofill

Retrofilling

• Envirotemp^® FR3^TM fluid is well-suited as a replacement fluid for upgrading the safety margin of fluid-filled transformers from both an environmental and fire safety aspect.
• It is fully miscible with conventional transformer oil, High Molecular Weight Hydrocarbons (HMWH), and most askeral substitutes. Unlike retrofilling with other less-flammable fluids, the residual transformer oil that remains in the transformer typically will not reduce the fire point below the NEC minimum of 300°C. This is true even after full equilibrium has been achieved between the replacement fluid and the residual oil in the paper.
• Additional advantages of retrofilling with Envirotemp FR3 fluid include high dielectric strength, excellent lubricity, material compatibility, and a coefficient of expansion similar to conventional transformer oil.
• The fluid also acts as a drying agent for transformer insulation that has become wet from aging. This property helps extend the useful life of the transformer insulation system.
• Envirotemp FR3 fluid does not cause foaming in transformer oil like trace amounts of silicone oil can under vacuum degassification. Nor does it cause paint adhesion problems, nor form the carbon silicates during switching that can lead to a severe reduction in dielectric strength.