Power device comprising an insulation gas for use in an electric energy power arrangement

A power device for use in an electric energy power arrangement, said power device comprising:

• a gas chamber, wherein said gas chamber is adapted to, when in a use state in said electric energy power arrangement, contain an insulation gas therein under a set of use conditions, said set of use conditions comprising a use pressure, and at an installation time at a beginning of the use state the use pressure comprises a predetermined installation pressure of said insulation gas in said gas chamber;
• and
• an insulation component comprising a polymer material in which at least some of said insulation gas is soluble, wherein said insulation component is arranged in relation to said gas chamber so as to be at least partly exposed to said insulation gas when the power device is in said use state,
• wherein at a delivery time, said power device having a delivery state, being a state of said power device before the installation time at which the power device is installed in said electric energy power arrangement, wherein, in said delivery state, said insulation component comprises a pre-filled amount of the insulation gas being dissolved in the polymer material of the insulation component under a set of predetermined gas dissolving conditions for at least a predetermined gas dissolving time period before the delivery time,
• wherein said predetermined gas dissolving conditions comprise a predetermined gas dissolving pressure being greater than said predetermined installation pressure,
• wherein when the power device is in said delivery state, said gas chamber comprises said insulation gas under a set of delivery conditions, wherein said set of delivery conditions comprises a delivery pressure, said delivery pressure being lower than said installation pressure, and
• wherein said set of predetermined gas dissolving conditions and said predetermined gas dissolving time period is such that the insulation component comprises the pre-filled amount of the insulation gas being such that the use pressure of the insulation gas in said gas chamber follows a generally linear decay from said installation pressure at the installation time, when subject to said use conditions, proportional to the time elapsed from said installation time.