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US 8,617,434 B2Granted
Additive for dielectric fluid
AssigneeCooper Industries, Inc.
InventorsKevin J. Rapp, Jerry L. Corkran, Gary A. Gauger, Charles P. McShane
Life of this patent
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Abstract
A dielectric fluid comprising hydrocarbon liquid admixed with an ester-based compound, wherein the ester-based compound is present in an effective amount to impart breakdown inhibiting properties to a paper insulation material when the dielectric fluid is in contact with the paper material.
Claims14
An electrical power distribution device with a dielectric fluid therein, wherein the dielectric fluid comprises:
- (a) 1% to 75% by weight of a methyl ester of a saturated or unsaturated fatty acid, wherein the methyl ester is produced by reacting the fatty acid with methanol in an acid or base catalyzed reaction;
- and
- (b) the balance a petroleum derived mineral oil or a petroleum derived synthetic oil.
An electrical power distribution device with a dielectric fluid therein, wherein the dielectric fluid comprises:
- (a) 5% to 50% by weight of a methyl ester of a saturated or unsaturated fatty acid with 4 to 12 carbon atoms, wherein the methyl ester is produced by reacting the fatty acid with methanol in an acid or base catalyzed reaction;
- (b) 0.1% to 2.5% by weight of at least one additive selected from an antioxidant, an antimicrobial agent, and a pour point depressant;
- and
- (c) the balance a petroleum derived mineral oil or a petroleum derived synthetic oil, wherein the electrical power distribution device is selected from at least one of transformers, regulators and switchgear.
1 more element
Dependencies are inferred from the claim text.