Patent ID: 8519293

Claim:
A gas-insulated power apparatus comprising at least first and second contiguous vessels being coaxially coupled to each other by way of respective flanges thereof, and power conductors included in the vessels and insulated from the vessels by an insulating gas, wherein a branch pipe shape vessel, which includes a power conductor disposed therein and insulated therefrom by the insulating gas, is connected to at least one of the first and second contiguous vessels so that the branch pipe shape vessel is substantially orthogonal to the coaxially coupled first and second contiguous vessels, the first and second contiguous vessels are coupled by squeezing a flange at an end of the second vessel to be coupled between a pressing member and a flange of the first vessel, the pressing member being screwed to the flange of the first vessel, and a lubrication layer is provided between the flange of the first vessel and the flange of the second vessel for maintaining airtightness between the flange of the first vessel and the flange of the second vessel and for permitting the flange of the first vessel and the flange of the second vessel to slide relative to each other in a peripheral direction of the flanges.