| 摘要 |
PURPOSE:To allow the measurement without losing an insulating oil with relatively simple constitution by using a fuel cell as a sensor and returning the sample oil used for the measurement to an oil-filled tank after the end of the measurement. CONSTITUTION:An oil-filled electric apparatus has the oil-filled tank 1 having a drain valve 8 in the lower part, an upper header 6 and a lower header 7, and a radiator 5 connecting both headers 6, 7 to the tank 1. The insulating oil from the radiator 5 side is extracted and is brought into contact as the sample oil with a semipermeable membrane 108 which allows the transmission of gaseous hydrogen but does not allow the transmission of the insulating oil. The gaseous hydrogen dissolved in the sample oil is extracted through the semipermeable membrane 108. The extracted gaseous hydrogen is supplied to the negative electrode of the fuel cell 101 using the gaseous hydrogen as fuel. The concn. of the gaseous hydrogen is measured by the fuel cell 101. The sample oil with which the measurement ends is returned through the drain valve 8 into the tank 1. |
