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

Patent metadata

Field	Value
Publication number	US-2024421569-A1
Application number	US-202218721024-A
Country	US
Kind code	A1
Filing date	Dec 15, 2022
Priority date	Dec 17, 2021
Publication date	Dec 19, 2024
Grant date	—

Abstract

A power device includes a gas chamber adapted to include an insulation gas under a set of use conditions including a predetermined installation pressure, and an insulation component including a material in which said insulation gas is soluble and being 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. The power device has a delivery state, being a state of said power device before and/or at an installation time at which the power device is installed in said electric energy power arrangement under said set of use conditions including said installation pressure of said insulation gas in said gas chamber, wherein, in said delivery state, said insulation component includes an amount of pre-filled insulation gas which is dissolved in the material of the insulation component.

First claim

1 .- 18 . (canceled)

19 . 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 power arrangement, contain within said gas chamber an insulation gas under a set of use conditions, said set of use conditions comprising a predetermined installation pressure of said insulation gas in said gas chamber, and said power device further comprising
an insulation component comprising a 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
said insulation component comprises a polymer material, said power device having a delivery state, being a state of said power device before and/or at an installation time at which the power device is installed in said electric energy power arrangement under said set of use conditions, wherein, in said delivery state, said insulation component comprises an amount of pre-filled insulation gas being dissolved in the material of the insulation component,
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 the insulation component comprises an amount of pre-filled insulation gas being such that the pressure of the insulation gas in said gas chamber follows a generally linear decay from said installation pressure, proportional to the time elapsed from said installation time.

20 . A method for manufacturing a power device for subsequent installation in an electric energy power arrangement,
the power device comprising
a gas chamber, wherein said gas chamber is adapted to, when the power device is in a use state wherein it is arranged for use in said power arrangement, contain within said gas chamber an insulation gas under a set of use conditions, said set of use conditions comprising a predetermined installation pressure of said insulation gas in said gas chamber, and said power device further comprising
an insulation component being 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;
said insulation component comprising a material in which at least some of said insulation gas is soluble, wherein said insulation component comprises a polymer material, and
the method comprising the step of:
prior to installing said power device in said use state,
subjecting said insulation component to said insulation gas under a set of predetermined gas dissolving conditions for at least a predetermined gas dissolving time period,
wherein said predetermined gas dissolving conditions comprise a predetermined gas dissolving pressure being greater than said installation pressure,
such that said insulation component is prefilled with an amount of insulation gas being dissolved in the material of the insulation component and
wherein said set of predetermined gas dissolving conditions and said predetermined gas dissolving time period is such that the insulation component is pre-filled with an amount of said insulation gas being such that the pressure of the insulation gas in said gas chamber follows a generally linear decay from said installation pressure at said installation time, when subject to said use conditions.

21 . The method according to claim 20 , comprising forming said power device comprising said insulation component before said step of subjecting said insulation component to said insulation gas under a set of predetermined gas dissolving conditions for at least a predetermined gas dissolving time period.

22 . The method according to claim 20 , wherein said step of subjecting the insulation component to said insulation gas under a set of predetermined gas dissolving conditions for at least a predetermined gas dissolving time period is performed with the insulation component being comprised in said power device and comprises:
filling said gas chamber with said insulation gas and maintaining said insulation gas in said chamber under said set of predetermined gas dissolving conditions of said power device for at least said predetermined gas dissolving time period, so as to form said power device being in a delivery state wherein said insulation component comprises an amount of pre-filled insulation gas being dissolved in the material of the insulation component before connection to a power arrangement.

23 . The method according to claim 20 , wherein said set of predetermined gas dissolving conditions comprises a predetermined gas dissolving temperature.

24 . The method according to claim 20 , wherein said set of predetermined use conditions comprises a predetermined use temperature range and said predetermined gas dissolving temperature is higher than said predetermined use temperature range.

25 . The method according to claim 20 , comprising the step of, after said predetermined gas dissolving time period, setting said power device to a set of predetermined storage conditions, such as a set of storage conditions comprising a storage pressure being less than said predetermined gas dissolving pressure and/or being less than said predetermined installation pressure.

26 . The power device according to claim 19 , wherein said generally linear decay is such that, using a first pressure difference being the difference between said installation pressure and a first pressure value representative of the pressure in said gas chamber a first instant being a selected time range, such as at least 5 days, from said installation time,
and a second pressure difference, being the difference between said first pressure and a second pressure, said second pressure value being representative of the pressure in said gas chamber at a second time instant being two subsequent of said selected time ranges, from the installation time, said second pressure difference deviates by less than 10% from said first pressure difference.

27 . The power device according to claim 26 , wherein said first and/or second pressure value are average values as determined over a predetermined measurement time range so as to be representative of the pressure in the gas chamber at said first or second time instant.

28 . The power device according to claim 19 , wherein said insulation component comprises a polymer material, such as an epoxy material, and/or
said insulation gas comprises SF6 gas, CO2 gas, O2 gas and/or N2 gas.

29 . The power device according to claim 19 , wherein said insulation component comprises a polymer material, which is an epoxy material, and said insulation gas comprises CO2 gas.

30 . The method according to claim 20 , wherein said insulation component comprises a polymer material, which is an epoxy material, and said insulation gas comprises CO2 gas.

31 . Method for arranging a power device according to claim 19 , comprising,
Installing said power device in an electrical energy power arrangement adapted to be operated at said use conditions.

32 . An electric energy power arrangement, comprising one or more power devices, out of which at least one power device is in accordance with claim 19 .

Assignees

• Hitachi Energy Ltd

Inventors

• Stengard Peter
• Thomas Richard
• Peters Hauke
• Fave Loic

Classifications

• H02B3/00 Primary

  Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear · CPC title

• H01B3/56

  gases · CPC title

• H01H2033/566

  Avoiding the use of SF6 · CPC title

• H01H33/56

  Gas reservoirs · CPC title

• H02B13/045

  Details of casing, e.g. gas tightness · CPC title