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US 8,427,807 B2Granted
Capacitor for application in high pressure environments
AssigneeSiemens Aktiengesellschaft
InventorsOve Bø, Gunnar Snilsberg
Life of this patent
Estimating the term…
Abstract
A capacitor (1) for application in high pressure environments has at least two electrodes (2.1, 2.2) and at least one electrically insulating film (5) forming a dielectric between the electrodes (2.1, 2.2), each electrode (2.1, 2.2) having at least one metallic foil (3.1, 3.2) or at least one metallic layer on the electrically insulating film (5), wherein the capacitor (1) is unencapsulated and designed to allow a surrounding liquid to fill cavities of the capacitor (1). Furthermore, an electric device has at least one such capacitor (1) in a device housing, whereby the device housing is filled with an electrically insulating liquid.
Claims20
A capacitor apparatus for application in high pressure environments comprising:
- a pair of terminals positioned on opposing lateral sides of the capacitor, at least two electrodes and at least one electrically insulating film forming a dielectric between the electrodes, each electrode comprising at least one metallic foil or at least one metallic layer on the electrically insulating film, each electrode connected to one of the terminals and extending laterally toward the other terminal, and each electrically insulating film extending laterally between the pair of terminals, wherein cavities are defined at interfaces between the insulating films and the metallic foils or layers, wherein the capacitor is disposed within a housing filled with a nonconducting liquid, wherein the capacitor is unencapsulated such that the liquid in the housing directly surrounds the capacitor and fills the cavities at the interfaces between the insulating films and the metallic foils or layers of the capacitor, wherein the housing of the capacitor apparatus is submersed in water in a deep sea environment, and wherein a pressure acting on the housing from outside the housing due to seawater is essentially the same as a pressure acting on the housing from inside the housing due to the nonconducting liquid in the housing.
An electric device comprising:
- a housing filled with an electrically insulating liquid, at least one unencapsulated capacitor, each comprising:
- a pair of terminals positioned on opposing lateral sides of the capacitor, and at least two electrodes and at least one electrically insulating film forming a dielectric between the electrodes, each electrode comprising at least one metallic foil or at least one metallic layer on the electrically insulating film, each electrode connected to one of the terminals and extending laterally toward the other terminal, and each electrically insulating film extending laterally between the pair of terminals, wherein cavities are defined at interfaces between the insulating films and the metallic foils or layers, wherein the at least one unencapsulated capacitor is located within the housing and surrounded by the electrically insulating liquid such that the liquid fills the cavities at interfaces between the insulating films and the metallic foils or layers of the at least one capacitor, wherein the electric device is submersed in water in a deep sea environment, wherein a pressure acting on the housing from outside the housing due to seawater is essentially the same as a pressure acting on the housing from inside the housing due to the electrically insulating liquid in the housing.
A method for using an electric device in a deep sea environment, comprising:
- providing an electric device having a housing filled with an electrically insulating liquid, and at least one unencapsulated capacitor including a pair of terminals positioned on opposing lateral sides of the capacitor and at least two electrodes and at least one electrically insulating film forming a dielectric between the electrodes, each electrode comprising at least one metallic foil or at least one metallic layer on the electrically insulating film, each electrode connected to one of the terminals and extending laterally toward the other terminal, and each electrically insulating film extending laterally between the pair of terminals wherein cavities are defined at interfaces between the insulating films and the metallic foils or layers, the at least one unencapsulated capacitor being arranged within the housing and surrounded by the electrically insulating liquid such that the liquid fills cavities between insulating films and metallic foils or layers of the at least one capacitor, and locating the electric device in a deep sea environment, wherein a pressure acting on the housing from outside the housing due to seawater is essentially the same as a pressure acting on the housing from inside the housing due to the electrically insulating liquid in the housing.
Dependencies are inferred from the claim text.