Abstract: A shaft seal device mounted rotating electrical machine includes; a rotating electrical machine which includes a rotating shaft equipped with a shaft seal device having an inlet portion and an outlet portion of seal oil, a main oil tank in which the seal oil supplied to the shaft seal device is stored, a seal oil cleanup tank which includes an inlet portion connected to an outlet portion of the main oil tank, and has an oil level regulating valve, a degassing pump which includes an inlet portion connected to an outlet portion of the seal oil cleanup tank, a pressure regulating valve which is disposed between the outlet portion of the seal oil cleanup tank and an outlet portion of the degassing pump, a differential pressure control valve which is disposed between the outlet portion of the degassing pump and the inlet portion of the shaft seal device.

Abstract: A shaft seal device mounted rotating electrical machine includes; a rotating electrical machine which includes a rotating shaft equipped with a shaft seal device having an inlet portion and an outlet portion of seal oil, a main oil tank in which the seal oil supplied to the shaft seal device is stored, a seal oil cleanup tank which includes an inlet portion connected to an outlet portion of the main oil tank, and has an oil level regulating valve, a degassing pump which includes an inlet portion connected to an outlet portion of the seal oil cleanup tank, a pressure regulating valve which is disposed between the outlet portion of the seal oil cleanup tank and an outlet portion of the degassing pump, a differential pressure control valve which is disposed between the outlet portion of the degassing pump and the inlet portion of the shaft seal device.

Abstract: A gas dryer of the invention, being a heaterless type of gas dryer that carries out dehumidifying of hydrogen gas circulating in an interior of a rotating electrical machine, includes a drying tower that causes moisture in the hydrogen gas to adsorb to a desiccant, and a funnel-form desiccant holding portion disposed in an interior of the drying tower and holding the desiccant, wherein the desiccant is introduced into the desiccant holding portion from an input valve of an upper portion of the drying tower, and moist desiccant is discharged from a discharge valve of a lower portion of the drying tower. The desiccant holding portion is configured of perforated metal, or the like, having ventilation, and is used as a partitioning plate that partitions the interior of the drying tower.