METHOD FOR DIAGNOSING AGED DETERIORATION OF OIL-IMMERSED ELECTRIC EQUIPMENT

PURPOSE:To easily carry out measurement with good reproducibility by detecting the amount of organic compounds other than combustible gas which exist in an insulating oil while being dissolved therein, and diagnosing the condition of the aged deterioration of an oil-immersed insulating material according to the result of the detection. CONSTITUTION:Gas which exists in a measuring container 2 while in a gaseous state is sucked by a suction pump 9 via a gas introducing pipe 6 and the amount of organic compounds contained in the gas is measured by a semiconductor gas sensor 10. As time elapses, the detection output of the semiconductor gas sensor 10 is attenuated after showing its peak value and a detecting circuit 12 outputs the peak value as detection data to a display portion 13 and an external output terminal 14. The result of the detection data of the semiconductor gas sensor 10 thus obtained is made to correspond to the operating years of oil-immersed electrical equipment, i.e., a measuring object. In this case, the operating years are substantial operating years(= operating years X average load factor) which take account of the average load factor of the equipment.