Dielectric fluid comprising fatty acid esters

Abstract

A method of isolating high-voltage components from other parts of an electrical device and conveying heat from the electrical device to the environment in order to cool the electrical device, includes applying a composition containing a mixture of castor oil fatty acid methyl esters as a dielectric fluid in the electrical device.

What is claimed is: 
     
         1 . A method of isolating high-voltage components from other parts of an electrical device and conveying heat from the electrical device to the environment in order to cool the electrical device, comprising applying a composition comprising a mixture of castor oil fatty acid methyl esters as a dielectric fluid in the electrical device. 
     
     
         2 . The method of  claim 1 , wherein the electrical device is selected from the group consisting of transformers, capacitors and electric cables. 
     
     
         3 . The method of  claim 1 , wherein the mixture of castor oil fatty acid methyl esters comprises at least one compound selected from the group consisting of methyl stearate, methyl oleate, methyl linoleate, methyl palmitate, methyl ricinoleate, and 10-undecylenic acid, preferably in a mass content of 0 to 1%. 
     
     
         4 . The method of  claim 1 , wherein the composition consists essentially of the mixture of castor oil fatty acid methyl esters. 
     
     
         5 . The method of  claim 1 , wherein the composition comprises a pour point depressant additive. 
     
     
         6 . The method of  claim 5 , wherein the composition consists essentially of the mixture of castor oil fatty acid methyl esters and the pour point depressant additive. 
     
     
         7 . The method of  claim 5 , wherein the pour point depressant additive is an acrylic polymer dissolved in an oil. 
     
     
         8 . The method of  claim 3 , wherein the mixture comprises methyl stearate in a mass content of 1 to 20%. 
     
     
         9 . The method of  claim 3 , wherein the mixture comprises methyl oleate in a mass content of 1 to 90%. 
     
     
         10 . The method of  claim 3 , wherein the mixture comprises methyl linoleate in a mass content of 1 to 80%. 
     
     
         11 . The method of  claim 3 , wherein the mixture comprises methyl palmitate in a mass content of 1 to 50%. 
     
     
         12 . The method of  claim 3 , wherein the mixture comprises methyl ricinoleate in a mass content of 0 to 4%. 
     
     
         13 . The method of  claim 3 , wherein the mixture comprises 10-undecylenic acid in a mass content of 0 to 1%. 
     
     
         14 . The method of  claim 5 , wherein the composition comprises a pour point depressant additive in a mass proportion of 0.1 to 5%. 
     
     
         15 . The method of  claim 14 , wherein the composition comprises a pour point depressant additive in a mass proportion of 1 to 2%. 
     
     
         16 . An electrical device comprising an enclosure containing a composition comprising a mixture of castor oil fatty acid methyl esters as a dielectric fluid. 
     
     
         17 . The electrical device of  claim 16 , which is selected from the group consisting of transformers, capacitors and electric cables. 
     
     
         18 . The electrical device of  claim 16 , wherein the mixture of castor oil fatty acid methyl esters comprises at least one compound selected from the group consisting of methyl stearate, methyl oleate, methyl linoleate, methyl palmitate, methyl ricinoleate and 10-undecylenic acid. 
     
     
         19 . The electrical device of  claim 16 , wherein the composition comprises a pour point depressant additive. 
     
     
         20 . The electrical device of  claim 19 , wherein the composition consists essentially of the mixture of castor oil fatty acid methyl esters and the pour point depressant additive.