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US 12,467,009 B2Granted
Synthetic ester and mineral oil dielectric fluids with increased stability
AssigneeCargill, Incorporated
InventorsTodd L. Kurth, Kevin R. Wirtz
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Abstract
A dielectric fluid is provided comprising an oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.
Claims8
A dielectric fluid comprising:
- a synthetic ester oil comprising a reaction product of a pentaerythritol and a C5-C12 linear or branched carboxylic acid;
- a phosphite component having one to three aryloxy groups and comprising from 0.1 to 0.5 wt % of the dielectric fluid;
- and
- a phenolic antioxidant component,
- wherein, the amount of the phosphite component is sufficient to reduce the stray gassing of the dielectric fluid as determined by dissolved gas analysis (ASTM D3612-02, Method C) by at least 60% as compared to a like dielectric fluid composition that does not contain a phosphite component, wherein the stray gas is hydrogen, and wherein the dielectric fluid has a fire point greater than 300° C. as determined by ISO 2592 and has a breakdown voltage of at least 45 kV as determined by IEC 60156.
2 more elements
Dependencies are inferred from the claim text.