The invention relates to compositions including esters of polyvalent alcohols that are esterified with fatty acids, partially unsaturated, from plant oils, and to the use thereof as cooling and insulating fluids for transformers.

The invention relates to compositions including esters of polyvalent alcohols that are esterified with fatty acids, partially unsaturated, from plant oils, and to the use thereof as cooling and insulating fluids for transformers.

An oil-oil bushing is disclosed which can include a rotationally symmetrical, paraboloid-like, hollow bushing element of a solid insulating material, along the axial extent of which there is formed radially toward the inside a tubular bushing channel, the wall thickness of which is tapered conically toward at least one of its two ends. An electrical bushing conductor can be fitted into the bushing channel with a form fit and protrude from it on both sides. At at least one of the two axial ends of the bushing channel there is arranged a hollow-cylindrical shielding element of a conductive material, which is thick-walled at least in certain regions, which element can enclose on one side a respective end of the bushing channel, and on another side, electrically contact a connecting conductor.

An oil-oil bushing is disclosed which can include a rotationally symmetrical, paraboloid-like, hollow bushing element of a solid insulating material, along the axial extent of which there is formed radially toward the inside a tubular bushing channel, the wall thickness of which is tapered conically toward at least one of its two ends. An electrical bushing conductor can be fitted into the bushing channel with a form fit and protrude from it on both sides. At at least one of the two axial ends of the bushing channel there is arranged a hollow-cylindrical shielding element of a conductive material, which is thick-walled at least in certain regions, which element can enclose on one side a respective end of the bushing channel, and on another side, electrically contact a connecting conductor.

The present invention provides a process to extract liquid dielectric coolant from the rice bran oil, which is suitable for both power frequency and high frequency electrical applications. The process comprises the steps of, processing the refined, bleached and deodorised rice bran oil with an alkali to remove the fatty acids. After processing the rice bran seed oil, at step, the processed rice bran oil is blended with a Sodium Hydroxide (NaOH) solution. The blended rice bran oil forms a top layer and a bottom layer within short duration of time. At step, the top layer is extracted and is water washed and filtered. At step, the top layer rice bran oil is mixed the Tert Butyl Hydroxy Quinone solution. Finally, at step, the mixture of filtered top layer and Tert Butyl Hydroxy Quinone solution is heated to extract the liquid dielectric coolant.

The present invention provides a process to extract liquid dielectric coolant from the rice bran oil, which is suitable for both power frequency and high frequency electrical applications. The process comprises the steps of, processing the refined, bleached and deodorised rice bran oil with an alkali to remove the fatty acids. After processing the rice bran seed oil, at step, the processed rice bran oil is blended with a Sodium Hydroxide (NaOH) solution. The blended rice bran oil forms a top layer and a bottom layer within short duration of time. At step, the top layer is extracted and is water washed and filtered. At step, the top layer rice bran oil is mixed the Tert Butyl Hydroxy Quinone solution. Finally, at step, the mixture of filtered top layer and Tert Butyl Hydroxy Quinone solution is heated to extract the liquid dielectric coolant.

The present invention provides a process to extract liquid dielectric coolant from the sesame oil, which is suitable for both power frequency and high frequency electrical applications. The process comprises the steps of, processing the refined, bleached and deodorised sesame seed oil with an alkali to remove the fatty acids. After processing the sesame seed oil, at step, the processed sesame seed oil is blended with a Sodium Hydroxide (NaOH) solution. The blended sesame oil forms a top layer and a bottom layer within short duration of time. At step, the top layer is extracted and is water washed and filtered. At step, the top layer sesame seed oil is mixed the Tert Butyl Hydroxy Quinone solution. Finally, at step, the mixture of filtered top layer and Tert Butyl Hydroxy Quinone solution is heated to extract the liquid dielectric coolant.

The present invention provides a process to extract liquid dielectric coolant from the sesame oil, which is suitable for both power frequency and high frequency electrical applications. The process comprises the steps of, processing the refined, bleached and deodorised sesame seed oil with an alkali to remove the fatty acids. After processing the sesame seed oil, at step, the processed sesame seed oil is blended with a Sodium Hydroxide (NaOH) solution. The blended sesame oil forms a top layer and a bottom layer within short duration of time. At step, the top layer is extracted and is water washed and filtered. At step, the top layer sesame seed oil is mixed the Tert Butyl Hydroxy Quinone solution. Finally, at step, the mixture of filtered top layer and Tert Butyl Hydroxy Quinone solution is heated to extract the liquid dielectric coolant.

An electrical connection structure includes: a first metal member including copper or a copper alloy, a plated tin layer being formed on at least a portion of the first metal member; a second metal member that is electrically connected or connectable to the first metal member; and a surface treating layer formed on the surface of the first metal member. The surface treating layer is formed by applying a surface treating agent containing base oil and a metal affinity compound having a lipophilic group and an affinity group that has an affinity for metal. The metal affinity compound contains an adduct between an acidic alkyl phosphate ester and an azole compound and an adduct between an acidic alkyl phosphate ester and a metal and/or an organic amine compound.

An electrical connection structure includes: a first metal member including copper or a copper alloy, a plated tin layer being formed on at least a portion of the first metal member; a second metal member that is electrically connected or connectable to the first metal member; and a surface treating layer formed on the surface of the first metal member. The surface treating layer is formed by applying a surface treating agent containing base oil and a metal affinity compound having a lipophilic group and an affinity group that has an affinity for metal. The metal affinity compound contains an adduct between an acidic alkyl phosphate ester and an azole compound and an adduct between an acidic alkyl phosphate ester and a metal and/or an organic amine compound.