抄録
The analysis of dissolved gases in oil-filled electrical equipment can be put to good use as information on its natural ageing and faults. So it is important to determine accurate amount of these gases in oil for keeping normal operation of oil-filled electrical equipment. Dissolved gases such as CO, CO2 and hydrocabons in standard oils containing N2 and O2 of 0.3_??_8vol.% and controlled at the temperature of 10°C, 25°C and 40°C were extracted by two methods and analysed with gas chromatography. One of these extraction methods was a vacuum piston method and the other was a stripping method.
It was found that in the case of the vacuum piston method, volume of CH4 gas extracted from standard oils decreased with decrease of the total volume of N2 and O2 gas, and with decrease of the oil temperature. Another compositions of gas such as CO, CO2, C2H2 and C2H4 showed the same tendency as that of CH2. On the other hand, in the case of the stripping method, volume of CH4 and other gases extracted from the same oil were not affected by the total volume of N2 and O2 gas and the oil temperature.
