Low Viscosity Dielectric Fluid via Fatty Acid Composition
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Solution Overview
Problem
Vegetable oil-based dielectric fluids used in transformers have higher viscosity than mineral oil-based fluids, leading to poorer heat transfer efficiency, and existing solutions to reduce viscosity either compromise on flash point, oxidation stability, or melting point.
Innovation Solution
A composition of triglycerides comprising C14:1 and/or C16:1 fatty acids, with limited amounts of C18:1, polyunsaturated, and saturated fatty acids, achieving a balance of low viscosity, high flash point, and low melting point, suitable for use as dielectric fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vegetable oil-based dielectric fluids are used to replace mineral oil-based fluids, then environmental friendliness and high flash point are improved, but viscosity increases significantly leading to poorer heat transfer operation
Solution Approach 1:
The patent changes the chemical composition parameters of the vegetable oil by specifying precise ranges of fatty acid components (C14:1, C16:1, C18:1, polyunsaturated, and saturated fatty acids) to achieve the desired balance of viscosity, flash point, and heat transfer properties
Solution Approach 2:
The patent creates a composite triglyceride composition by combining multiple types of fatty acids in specific proportions (C14:1 and/or C16:1 as main component, with controlled amounts of C18:1, polyunsaturated, and saturated fatty acids) to achieve synergistic effects that balance viscosity reduction with maintained flash point and heat transfer efficiency
2Productivity
If blending with lower viscosity fluids such as polyalphaolefins or synthetic polyol esters is performed, then viscosity is reduced, but flash point is lowered or non-natural based sources are substituted
Solution Approach 1:
The patent changes the intrinsic parameters of the vegetable oil itself by selecting and combining specific fatty acid types and proportions, rather than adding external blending agents, thereby reducing viscosity while maintaining the natural based source and high flash point characteristics
3Productivity
If mixing with diluent such as fatty acid alkyl ester is performed, then viscosity is reduced below 33 cP, but flash point is lowered and diluent amount exceeds 10 wt %
Solution Approach 1:
The patent achieves viscosity reduction through fundamental changes in the triglyceride molecular structure and fatty acid composition (using C14:1 and/or C16:1 dominant composition), eliminating the need for external diluents and their associated drawbacks of flash point reduction and excessive additive content
4Productivity
If increasing the amount of unsaturation in the VO-based dielectric fluid is performed, then viscosity is lowered, but oxidation stability is lowered
Solution Approach 1:
The patent optimizes the unsaturation level by selecting specific fatty acid types (C14:1 and C16:1 monounsaturated fatty acids as main components) and controlling the polyunsaturated fatty acid content to no more than 12%, achieving viscosity reduction while maintaining oxidation stability through balanced composition rather than extreme unsaturation
5Productivity
If increasing the amount of saturated C12-C16 triglycerides is performed, then viscosity is reduced, but melting point increases
Solution Approach 1:
The patent changes the saturation parameters by limiting saturated fatty acid content to no more than 7% and dominant to C14:1 and C16:1 unsaturated fatty acids, achieving viscosity reduction through molecular structure optimization while preventing melting point increase by avoiding excessive saturation
Data Source
AI summary
A vegetable-based dielectric fluid comprising in weight percent of triglycerides based on the weight of the fluid: A. Greater than 0 to 100% of at least one of C14:1 or C16:1 fatty acids; and at least one of: B. No more than (≦) 10% of C18:1 fatty acids; C. No more than (≦) 12% of one or more polyunsaturated fatty acids; and D. No more than (≦) 7% of one or more saturated fatty acids. The dielectric fluid is a useful transformer oil.