초록 ▼

An electrical apparatus, such as a transformer, includes an expandable internal chamber that is nonventing and completely and permanently sealed from the ambient environment. The chamber houses a core and coil assembly or other current-carrying conductor and is completely filled with dielectric flui

An electrical apparatus, such as a transformer, includes an expandable internal chamber that is nonventing and completely and permanently sealed from the ambient environment. The chamber houses a core and coil assembly or other current-carrying conductor and is completely filled with dielectric fluid having a pressure less than one atmosphere. The enclosure walls are flexible and are permitted to bow inwardly and outwardly as the volume of the dielectric fluid changes due to thermal expansion and contraction. A method of processing the dielectric fluid and filling and sealing the transformer at sub-atmospheric pressure is also disclosed.

대표청구항 ▼

[ What is claimed is:] [1.] An electrical apparatus comprising:an enclosure having a hermetically sealed, expandable chamber wherein said chamber is expandable from a first volume to a second volume;a conductor disposed in said sealed chamber;a dielectric liquid surrounding said conductor and comple

[ What is claimed is:] [1.] An electrical apparatus comprising:an enclosure having a hermetically sealed, expandable chamber wherein said chamber is expandable from a first volume to a second volume;a conductor disposed in said sealed chamber;a dielectric liquid surrounding said conductor and completely filling said chamber;wherein said liquid is sealed in said chamber at an absolute pressure that is less than one atmosphere;wherein said liquid comprises a fluid made of two or more compounds selected from the group consisting of alphaolefin oligomers with carbon chain lengths of C.sub.6 to C.sub.12, aromatic hydrocarbons, polyols esterified to branched alkyl groups with chain lengths of C.sub.5 to C.sub.20, and triglycerides.