| 摘要 |
PURPOSE:To prevent adverse influences caused by a dissolved gas by providing a space generating means and a vibrator on a gas extracting chamber, and communicating a gas detecting chamber having a gas detecting element with this gas extracting chamber. CONSTITUTION:A bellows 10 is moved upward by operating a bellows driving part 11, and a gas extracting chamber 3, an oil feed-in pipe 5, and an oil feed-out pipe is filled with an insulating oil 2. Subsequently, opening and closing valves 6, 7 are opened, and the insulating oil 2 in the gas extracting chamber 3 is circulated between the gas extracting chamber 3 and a tank 1 by a pump 8. Thereafter, the pump 8 is stopped, the bellows driving part 11 is driven in a state that the opening and closing valves 6, 7 are closed, a space A under a reduced pressure is generated in the upper part of the inside of the gas extracting chamber 3, and a dissolved gas in oil is extracted to the space A by a vibrator 12. Subsequently, the vibration of the vibrator 12 is stopped, a clean air is made to flow into the space A by opening valves 15, 16 and 18, the valve 18 is closed and the valve 17 is opened, the insulating oil 2 in the tank 1 is made to flow into the gas extracting chamber 3 by opening the valve 6, a mixed gas of the dissolved gas in oil and air is fed to a detecting chamber 9, and the components are measured by a gas detecting element 20. |
