Gas insulated electric apparatus
AssigneeHitachi Energy Ltd
InventorsMarkus Keller, Urs Kruesi, Loic Fave, Johannes Hengstler, Moritz Boehm, Roman Kochetov
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Abstract
The disclosure relates to a gas insulated electric apparatus, which includes an enclosure, an electric high voltage appliance arranged inside the enclosure and a permeation barrier arranged within the enclosure and circumferentially surrounding the electric high voltage appliance, whereby the enclosure contains an insulation gas including at least 70% by volume of CO2 and including an elevated and pre-determined operating gas pressure level, and the permeation barrier includes a permeation layer surrounded on at least one side by a flow promoter layer and/or a surface activation and/or primer layer.
Claims14
A gas insulated electric apparatus comprising:
- an enclosure, an electric high voltage appliance arranged inside the enclosure, and a permeation barrier arranged within the enclosure and circumferentially surrounding the electric high voltage appliance, whereby
- the enclosure contains an insulation gas comprising at least 70% by volume of CO2 and comprising an elevated and pre-determined operating gas pressure level,
- the permeation barrier comprises a permeation layer surrounded on at least one side by a flow promoter layer and/or a surface activation and/or primer layer, and
- the permeation layer comprises ethylene vinyl alcohol (EVOH) and/or aluminum oxide foil.
A method for manufacturing a gas insulated electric apparatus comprising an electric high voltage appliance, comprising the steps of:
- manufacturing an enclosure for arranging the electric high voltage appliance therein, and
- applying, during manufacturing, a permeation barrier within the enclosure circumferentially surrounding the electric high voltage appliance, whereby
- the permeation barrier comprises a permeation layer surrounded on at least one side by a flow promoter layer and/or a surface activation and/or primer layer, and
- the permeation layer comprises ethylene vinyl alcohol (EVOH) and/or aluminum oxide foil.
Dependencies are inferred from the claim text.