US Patent No: 5,736,915
Number of patents in Portfolio can not be more than 2000
Hermetically sealed, non-venting electrical apparatus with dielectric fluid having defined chemical composition
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Apr 7, 1998
Issued date -
Dec 21, 1995
filing date -
08/576,155
serial no -
In Force
status
Importance
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Abstract
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.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,413,674 Transformer cooling structure | 21 | 1983 | |
| 4,745,966 Heat exchangers and electrical apparatus having heat exchangers | 27 | 1986 | |
| 4,834,257 Reinforced wall structure for a transformer tank | 17 | 1987 | |
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| 4,187,327 Method of processing an electrical apparatus | 17 | 1977 | |
| 4,846,163 Method of sealing capacitor bushings | 17 | 1987 | |
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| 4,904,972 Gas-insulated stationary induction electrical apparatus | 45 | 1989 | |
| 5,324,886 Insulating-liquid immersed electrical machine | 4 | 1992 | |
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| 4,467,305 Gas/vapor cooled electromagnetic induction machine | 14 | 1982 | |
| 5,508,672 Stationary induction apparatus | 4 | 1995 | |
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| 4,621,302 Electrical insulating oil and electrical appliances impregnated with the same | 26 | 1985 | |
| 5,017,733 Electrical insulating oil composition | 18 | 1987 | |
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| 5,455,551 Integrated temperature sensing duct spacer unit and method of forming | 7 | 1993 | |
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| 4,681,302 Energy absorbing barrier | 135 | 1985 | |
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| 5,462,685 Ferrofluid-cooled electromagnetic device and improved cooling method | 8 | 1993 | |
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| 5,336,847 Stationary induction apparatus containing uninflammable insulating liquid | 6 | 1992 | |
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| 4,738,780 Method for replacing PCB-containing coolants in electrical induction apparatus with substantially PCB-free dielectric coolants | 20 | 1985 | |
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| 5,047,744 High voltage fluid filled transformer | 2 | 1990 | |
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| 4,747,447 Heat exchanger | 18 | 1983 | |
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| 5,473,302 Narrow profile transformer having interleaved windings and cooling passage | 7 | 1994 | |