| 摘要 |
PROBLEM TO BE SOLVED: To meet the restrictive conditions of the transport dimension limits, allowable stress values of pressure vessels, etc., and lessen the number of manufacturing processes by providing a concentric groove between the center and periphery of the inside of a bottom plate forming a tank. SOLUTION: A gas-insulated static electric machine houses a static electric machine body composed of a coil and core and a gas of SF6, etc., in a vertical tank 9 having a flat bottom plate structure. A bottom plate 10 has a tank groove 14 cut in the circumferential direction into a part not contributing to the rigidity against the internal pressure of a gas, thereby reducing the wt. To raise the rigidity, formed channels or reinforcements radial to the bottom plate such as solid blocks, H-steels, etc., are disposed in radial directions of the bottom plate groove. Ribs are provided in the circumferential direction between the reinforcements. The bottom plate 10 has a sectorial groove or square or polygonal groove provided at a part not contributing to the rigidity against the internal pressure of a gas, thereby reducing the wt.
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